公文流转系统

连接了数据库，数据库的增删改查，建用户数据库。 写了住界面和功能界面，拟制公文的界面

package util;


import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;

import entity.Doc;
import entity.Permission;
import entity.Users;
/**
 *
 * @author twj
 *
 */
public class DBUtil {

    private static String db_url = "jdbc:mysql://localhost:3306/test3?useUnicode=true&characterEncoding=utf8&serverTimezone=UTC";
    public static String db_user = "root";
    public static String db_pass = "123";

    public static Connection getConn () {
        Connection conn = null;

        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection(db_url, db_user, db_pass);
        } catch (Exception e) {
            e.printStackTrace();
        }

        return conn;
    }

    /**
     * �ر�����
     * @param state
     * @param conn
     */


    public static void close (Statement state, Connection conn) {
        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    public static void close (ResultSet rs, Statement state, Connection conn) {
        if (rs != null) {
            try {
                rs.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (state != null) {
            try {
                state.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }

        if (conn != null) {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }

    //某表的增删改查
        public static ArrayList<Doc> getDoces(String type)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql;
                System.out.println(type);
                if(type.equals("receive"))
                {
                    sql="select * from doc_list where status=0 or status=2 or status=3 or status=6 or status=7 or status=-1 and deletestatus=0";
                }
                else if(type.equals("send"))
                {
                    sql="select * from doc_list where status=1 or status=4 or status=5 or status=8 or status=9 or status=10 and deletestatus=0";
                }
                else if(type.equals("delete"))
                {
                    sql="select * from doc_list where deletestatus=1";
                }
                else {
                    sql="select * from doc_list";
                }
                preparedStatement=connection.prepareStatement(sql);
                rSet=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rSet.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rSet.getInt("id"));
                    doc.setTitle(rSet.getString("title"));
                    doc.setOwner(rSet.getString("owner"));
                    doc.setTime(rSet.getString("time"));
                    doc.setReceiver(rSet.getString("receiver"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    doc.setPlace(rSet.getString("place"));
                    doc.setDeletestatus(rSet.getInt("deletestatus"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }

        //登录时验证数据库中账户是否存在
        public static boolean log_isExist(Users user)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            ResultSet rs=null;
            try {
                con=getConn();
                String sql_query="select * from users where username = '"+user.getUsername()+"' and password = '"+user.getPassword()+"' and status != 0";
                System.out.println(sql_query);
                pstmt=con.prepareStatement(sql_query);
                rs=pstmt.executeQuery();
                if(rs.next()==false)
                {
                    System.out.println("用户名或密码错误");
                    return false;
                }
                else
                {
                    System.out.println("用户名及密码正确");
                    return true;
                }
            }
            catch (SQLException e) {
                System.out.println("未连接");
                e.printStackTrace();
            }
            finally {
                close(rs, pstmt, con);
            }
            return false;
        }

        //增加公文
        public static boolean add_doc(Doc doc)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            ResultSet rs=null;
            try {
                con=getConn();
                String sql="insert into doc_list(title,owner,receiver,time,status,result,place,deletestatus,callback) values(?,?,?,?,?,?,?,?,?)";
                pstmt=con.prepareStatement(sql);
                pstmt.setString(1, doc.getTitle());
                pstmt.setString(2, doc.getOwner());
                pstmt.setString(3, doc.getReceiver());
                pstmt.setString(4, doc.getTime());
                pstmt.setInt(5, doc.getStatus());
                pstmt.setInt(6, doc.getResult());
                pstmt.setString(7, doc.getPlace());
                pstmt.setInt(8, 0);
                pstmt.setInt(9, 0);
                pstmt.executeUpdate();
                return true;
            }
            catch (SQLException e) {
                System.out.println("注册失败");
                e.printStackTrace();
            }
            finally {
                close(rs, pstmt, con);
            }
            return false;
        }


        //删除数据
        public static boolean delete_user(Users user)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="delete from users where id="+user.getId();
                System.out.println(sql);
                pstmt=con.prepareStatement(sql);
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static boolean update_userstatus(Users user)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="update users set status = ? where id = ?";
                pstmt=con.prepareStatement(sql);
                pstmt.setInt(1, user.getStatus());
                pstmt.setInt(2, user.getId());
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static boolean update_user(Users user)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="update users set username=?,password=?,job=? where id = "+user.getId();
                pstmt=con.prepareStatement(sql);
                pstmt.setString(1, user.getUsername());
                pstmt.setString(2, user.getPassword());
                pstmt.setString(3, user.getJob());
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        @SuppressWarnings("resource")
        public static boolean sendDoc(int id)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            ResultSet rSet=null;
            int status=-1;
            int newstatus=-1;
            String receiver="";
            try {
                con=DBUtil.getConn();
                String sql_query="select * from doc_list where id="+id;
                pstmt=con.prepareStatement(sql_query);
                rSet=pstmt.executeQuery();
                if(rSet.next())
                {
                    status=rSet.getInt("status");
                }
                switch (status) {
                case 0:
                    newstatus=1;
                    receiver="副厂长";
                    break;
                case 2:
                    newstatus=5;
                    receiver="厂长";
                    break;
                case 3:
                    newstatus=4;
                    receiver="部门";
                    break;
                case 6:
                    newstatus=8;
                    receiver="部门和副厂长";
                    break;
                case 7:
                    newstatus=9;
                    receiver="部门和副厂长";
                    break;
                case 8:
                    newstatus=10;
                    receiver="部门";
                    break;
                default:
                    System.out.println("公文状态有误！");
                    break;
                }
                String sql_update="update doc_list set status = ? where id = ?";
                pstmt=con.prepareStatement(sql_update);
                pstmt.setInt(1, newstatus);
                pstmt.setInt(2, id);
                pstmt.executeUpdate();
                return true;
            }
            catch (SQLException e) {
                System.out.println("数据库信息更新失败");
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static ArrayList<Doc> getDocesByCase(String type,String value)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql="";
                System.out.println(type);
                if(type.equals("title"))
                {
                    sql="select * from doc_list where title='"+value+"'";
                }
                else if(type.equals("owner"))
                {
                    sql="select * from doc_list where owner='"+value+"'";
                }
                else if(type.equals("receiver"))
                {
                    sql="select * from doc_list where receiver='"+value+"'";
                }
                else if(type.equals("result"))
                {
                    sql="select * from doc_list where result='"+value+"'";
                }
                preparedStatement=connection.prepareStatement(sql);
                rSet=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rSet.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rSet.getInt("id"));
                    doc.setTitle(rSet.getString("title"));
                    doc.setOwner(rSet.getString("owner"));
                    doc.setTime(rSet.getString("time"));
                    doc.setReceiver(rSet.getString("receiver"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    doc.setPlace(rSet.getString("place"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }

        public static ArrayList<Doc> getCheckedorNot(String type)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql="";
                System.out.println(type);
                if(type.equals("notchecked"))
                {
                    sql="select * from doc_list where status=1";
                }
                else
                {
                    sql="select * from doc_list where status!=1 and status!=0 and status!=-1";
                }
                preparedStatement=connection.prepareStatement(sql);
                rSet=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rSet.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rSet.getInt("id"));
                    doc.setTitle(rSet.getString("title"));
                    doc.setOwner(rSet.getString("owner"));
                    doc.setTime(rSet.getString("time"));
                    doc.setReceiver(rSet.getString("receiver"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    doc.setPlace(rSet.getString("place"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }

        public static ArrayList<Doc> getFcheckedorNot(String type)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql="";
                if(type.equals("checked"))
                {
                    sql="select * from doc_list where status=6 or status=7";
                }
                else
                {
                    sql="select * from doc_list where status=5";
                }
                preparedStatement=connection.prepareStatement(sql);
                rSet=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rSet.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rSet.getInt("id"));
                    doc.setTitle(rSet.getString("title"));
                    doc.setOwner(rSet.getString("owner"));
                    doc.setTime(rSet.getString("time"));
                    doc.setReceiver(rSet.getString("receiver"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    doc.setPlace(rSet.getString("place"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }


        public static ArrayList<Doc> getReceivedByUser(String type,Users user)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql="";
                if(type.equals("received"))
                {
                    sql="select * from doc_list where owner=? and status=10";
                }
                else
                {
                    sql="select * from doc_list where owner=? and status!=10";
                }
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1, user.getUsername());
                rSet=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rSet.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rSet.getInt("id"));
                    doc.setTitle(rSet.getString("title"));
                    doc.setTime(rSet.getString("time"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }

        public static Doc getDocById(Doc doc)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql="select * from doc_list where id="+doc.getId();
                preparedStatement=connection.prepareStatement(sql);
                rSet=preparedStatement.executeQuery();
                if(rSet.next())
                {
                    doc.setTitle(rSet.getString("title"));
                    doc.setOwner(rSet.getString("owner"));
                    doc.setTime(rSet.getString("time"));
                    doc.setReceiver(rSet.getString("receiver"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    doc.setPlace(rSet.getString("place"));
                    doc.setTipplace(rSet.getString("tipplace"));
                    doc.setFtipplace(rSet.getString("tipfplace"));
                    return doc;
                }
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }

        public static boolean checked_change(Doc doc)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            String sql_update="update doc_list set status = ?,result = ?,receiver = ?,tipplace = ? where id = ?";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql_update);
                preparedStatement.setInt(1, doc.getStatus());
                preparedStatement.setInt(2, doc.getResult());
                preparedStatement.setString(3, doc.getReceiver());
                preparedStatement.setString(4, doc.getTipplace());
                preparedStatement.setInt(5, doc.getId());
                preparedStatement.executeUpdate();
                return true;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return false;
        }

        public static boolean fchecked_change(Doc doc)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            String sql_update="update doc_list set status = ?,result = ?,receiver = ?,tipfplace = ? where id = ?";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql_update);
                preparedStatement.setInt(1, doc.getStatus());
                preparedStatement.setInt(2, doc.getResult());
                preparedStatement.setString(3, doc.getReceiver());
                preparedStatement.setString(4, doc.getFtipplace());
                preparedStatement.setInt(5, doc.getId());
                preparedStatement.executeUpdate();
                return true;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return false;
        }

        public static boolean formatDoc(Doc doc)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            String sql_update="update doc_list set status = ? where id = ?";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql_update);
                preparedStatement.setInt(1, doc.getStatus());
                preparedStatement.setInt(2, doc.getId());
                preparedStatement.executeUpdate();
                return true;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return false;
        }

        public static boolean ReceiveDoc(Doc doc)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            String sql_update="update doc_list set status = ?,callback = 1 where id = ?";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql_update);
                preparedStatement.setInt(1, 10);
                preparedStatement.setInt(2, doc.getId());
                preparedStatement.executeUpdate();
                return true;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return false;
        }

        public static ArrayList<Doc> getDocByTime(Doc doc1,Doc doc2)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rs=null;
            String sql="select * from doc_list where time between ? and ?";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql);
                preparedStatement.setString(1,doc1.getTime());
                preparedStatement.setString(2, doc2.getTime());
                rs=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rs.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rs.getInt("id"));
                    doc.setTitle(rs.getString("title"));
                    doc.setTime(rs.getString("time"));
                    doc.setOwner(rs.getString("owner"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return null;
        }

        public static ArrayList<Doc> getAllDoc()
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rs=null;
            String sql="select * from doc_list";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rs.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rs.getInt("id"));
                    doc.setTitle(rs.getString("title"));
                    doc.setTime(rs.getString("time"));
                    doc.setOwner(rs.getString("owner"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return null;
        }

        public static ArrayList<Users> getAllUser()
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rs=null;
            String sql="select * from users";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                ArrayList<Users> list=new ArrayList<>();
                while(rs.next())
                {
                    Users user=new Users();
                    user.setId(rs.getInt("id"));
                    user.setUsername(rs.getString("username"));
                    user.setPassword(rs.getString("password"));
                    user.setPermissionId(rs.getInt("permissionId"));
                    user.setJob(rs.getString("job"));
                    user.setStatus(rs.getInt("status"));
                    list.add(user);
                }
                return list;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return null;
        }

        public static Users getUserById(Users user)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rs=null;
            String sql="select * from users where id="+user.getId();
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                Users user1=new Users();
                if(rs.next())
                {
                    user1.setId(rs.getInt("id"));
                    user1.setUsername(rs.getString("username"));
                    user1.setPassword(rs.getString("password"));
                    user1.setPermissionId(rs.getInt("permissionId"));
                    user1.setStatus(rs.getInt("status"));
                    user1.setJob(rs.getString("job"));
                }
                return user1;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return null;
        }

        public static ArrayList<Permission> getPermission(Permission permission)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rs=null;
            String sql="select * from permission where id="+permission.getId();
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                ArrayList<Permission> list=new ArrayList<>();
                while(rs.next())
                {
                    Permission permission1=new Permission();
                    permission1.setId(rs.getInt("id"));
                    permission1.setPermission(rs.getInt("permission"));
                    list.add(permission1);
                }
                return list;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return null;
        }

        public static boolean deletePermission(Permission permission)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="delete from permission where id="+permission.getId();
                System.out.println(sql);
                pstmt=con.prepareStatement(sql);
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static boolean updatePermission(Permission permission1,Permission permission2)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="update permission set permission = ? where id = ? and permission = ?";
                pstmt=con.prepareStatement(sql);
                pstmt.setInt(1, permission2.getPermission());
                pstmt.setInt(2, permission1.getId());
                pstmt.setInt(3, permission1.getPermission());
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static boolean updatePwd(Users user)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="update users set password = ? where username = ?";
                pstmt=con.prepareStatement(sql);
                pstmt.setString(1, user.getPassword());
                pstmt.setString(2, user.getUsername());
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static Users getUserByUsername(Users user)
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rs=null;
            String sql="select * from users where username='"+user.getUsername()+"'";
            try {
                connection=getConn();
                preparedStatement=connection.prepareStatement(sql);
                rs=preparedStatement.executeQuery();
                Users user1=new Users();
                if(rs.next())
                {
                    user1.setId(rs.getInt("id"));
                    user1.setPermissionId(rs.getInt("permissionId"));
                    System.out.println(user1.getPermissionId());
                }
                return user1;
            } catch (SQLException e) {
                // TODO 自动生成的 catch 块
                e.printStackTrace();
            }
            finally {
                close(preparedStatement, connection);
            }
            return null;
        }

        public static boolean deleteDoc(Doc doc)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="update doc_list set deletestatus = ? where id = ?";
                pstmt=con.prepareStatement(sql);
                pstmt.setInt(1, doc.getDeletestatus());
                pstmt.setInt(2, doc.getId());
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static ArrayList<Doc> getCall()
        {
            Connection connection=null;
            PreparedStatement preparedStatement=null;
            ResultSet rSet=null;
            try {
                connection=getConn();
                String sql="select * from doc_list where callback=1";
                preparedStatement=connection.prepareStatement(sql);
                rSet=preparedStatement.executeQuery();
                ArrayList<Doc> list=new ArrayList<>();
                while(rSet.next())
                {
                    Doc doc=new Doc();
                    doc.setId(rSet.getInt("id"));
                    doc.setTitle(rSet.getString("title"));
                    doc.setOwner(rSet.getString("owner"));
                    doc.setTime(rSet.getString("time"));
                    doc.setReceiver(rSet.getString("receiver"));
                    doc.setStatus(rSet.getInt("status"));
                    doc.setResult(rSet.getInt("result"));
                    doc.setPlace(rSet.getString("place"));
                    doc.setDeletestatus(rSet.getInt("deletestatus"));
                    doc.setCallback(rSet.getInt("callback"));
                    list.add(doc);
                }
                return list;
            } catch (SQLException e) {
                // TODO: handle exception
                e.printStackTrace();
            }
            finally {
                close(rSet, preparedStatement, connection);
            }
            return null;
        }

        public static boolean setCallOver(Doc doc)
        {
            Connection con=null;
            PreparedStatement pstmt=null;
            try {
                con=getConn();
                String sql="update doc_list set callback = ? where id = ?";
                pstmt=con.prepareStatement(sql);
                pstmt.setInt(1, 0);
                pstmt.setInt(2, doc.getId());
                pstmt.executeUpdate();
                return true;
            }
            catch(SQLException e)
            {
                e.printStackTrace();
            }
            finally {
                close(pstmt, con);
            }
            return false;
        }

        public static void main(String[] args) {
            //getConnection();

        }
}

但是各角色的权限不同，对应功能也不同，这个还是不会。现在有的还是不对。再有就是借鉴了大神的代码，把文件的路径的改为自己的文件路径，但是公文还是发不出去。