展示页面jsp：
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>Insert title here</title> </head> <body> <script type="text/javascript"> function getData() { //创建ajax引擎对象 var ajax; var name=document.getElementById("tid").value; //console.log(name); if(window.XMLHttpRequest){//火狐 ajax= new XMLHttpRequest(); }else if(window.ActiveXObject){//ie ajax=new ActiveXObject("Msxml2.XMLHTTP"); } //复写onreadyststement ajax.onreadystatechange = function () { //判断ajax状态码 if(ajax.readyState==4){ //alert(5); //判断响应状态码（200、405、404、500） if(ajax.status==200){ //获取响应内容（相应内容的格式） var res=ajax.responseText; //console.log(res[0]+" "+res[1]); eval("var obj="+res); //alert(obj.heroName); //console.log(obj.name); //alert(res); //alert(obj.name); //alert(obj); if(obj!=null){ var ta=document.getElementById("tt"); ta.innerHTML=""; var tr=ta.insertRow(0); tr.insertCell(0).innerHTML="编号"; tr.insertCell(1).innerHTML="生命值"; tr.insertCell(2).innerHTML="属性"; tr.insertCell(3).innerHTML="描述"; var ts=ta.insertRow(1); ts.insertCell(0).innerHTML=obj.heroName; ts.insertCell(1).innerHTML=obj.lifeNum; ts.insertCell(2).innerHTML=obj.type; ts.insertCell(3).innerHTML=obj.desc; }else{ //eval("var obj="+"查无此人"); document.getElementById("d1").innerHTML="查无此人"; //document.write("error");会重新刷整个页面 } }else if(ajax.status==404){ }else if(ajax.status==500){ } } } ajax.open("get","user?name="+name); ajax.send(null); } </script> 英雄名称：<input type="text" name="uname" value="" id="tid"> <input type="button" value="搜索" onclick="getData()"> <div id="d1"></div> <table border="1px" id="tt"> </table> </body> </html>
处理Servlet：
package com.zyb.Servlet; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import com.google.gson.Gson; import com.zyb.Service.UserService; import com.zyb.ServiceImp.UserServiceImp; import com.zyb.pojo.User; @WebServlet("/user") public class UserServlet extends HttpServlet{ @Override protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { //设置请求编码格式 req.setCharacterEncoding("utf-8"); //设置响应编码格式 resp.setCharacterEncoding("utf-8"); resp.setContentType("text/html;charst=utf-8"); //获取请求信息 String name=req.getParameter("name"); System.out.println("英雄名为:"+name); //name=name.replaceAll(" ",""); //System.out.println(name.contains(" ")); //处理请求 //获取业务层对象 UserService us = new UserServiceImp(); User u = us.getUserInfoService(name); System.out.println("查询结果为："+u); //resp.getWriter().write("var obj={}; obj.name="+u.getHeroName()+";obj.lifenum="+u.getLifeNum()+ // ";obj.type="+u.getType()+";obj.desc="+u.getDesc()+";"); /*resp.getWriter().write("{name:"+u.getHeroName()+ ",lifenum:"+u.getLifeNum()+ ",type:"+u.getType()+ ",desc:"+u.getDesc() +"}");*/ resp.getWriter().write(new Gson().toJson(u)); //System.out.println("var obj={}; obj.name="+u.getHeroName()+";obj.lifenum="+u.getLifeNum()+ // ";obj.type="+u.getType()+";obj.desc="+u.getDesc()+";"); //响应请求 } }
业务层（Service）：
package com.zyb.Service; import com.zyb.pojo.User; public interface UserService { User getUserInfoService(String name); }
package com.zyb.ServiceImp; import com.zyb.Dao.UserDao; import com.zyb.DaoImp.UserDaoImpl; import com.zyb.Service.UserService; import com.zyb.pojo.User; public class UserServiceImp implements UserService{ //获取Dao层对象 UserDao ud = new UserDaoImpl(); @Override public User getUserInfoService(String name) { // TODO Auto-generated method stub return ud.getUserInfo(name); } }
实体类：
package com.zyb.pojo; public class User { private String heroName; private int lifeNum; private String type; private String desc; public String getHeroName() { return heroName; } public void setHeroName(String heroName) { this.heroName = heroName; } public int getLifeNum() { return lifeNum; } public void setLifeNum(int lifeNum) { this.lifeNum = lifeNum; } public String getType() { return type; } public void setType(String type) { this.type = type; } public String getDesc() { return desc; } public void setDesc(String desc) { this.desc = desc; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((desc == null) ? 0 : desc.hashCode()); result = prime * result + ((heroName == null) ? 0 : heroName.hashCode()); result = prime * result + lifeNum; result = prime * result + ((type == null) ? 0 : type.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; User other = (User) obj; if (desc == null) { if (other.desc != null) return false; } else if (!desc.equals(other.desc)) return false; if (heroName == null) { if (other.heroName != null) return false; } else if (!heroName.equals(other.heroName)) return false; if (lifeNum != other.lifeNum) return false; if (type == null) { if (other.type != null) return false; } else if (!type.equals(other.type)) return false; return true; } public User(String heroName, int lifeNum, String type, String desc) { //super(); this.heroName = heroName; this.lifeNum = lifeNum; this.type = type; this.desc = desc; } public User(){ } @Override public String toString() { return "User [heroName=" + heroName + ", lifeNum=" + lifeNum + ", type=" + type + ", desc=" + desc + "]"; } }
Dao层：
package com.zyb.Dao; import com.zyb.pojo.User; public interface UserDao { User getUserInfo(String name); }
package com.zyb.DaoImp; 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 com.zyb.Dao.UserDao; import com.zyb.pojo.User; public class UserDaoImpl implements UserDao{ @Override public User getUserInfo(String name) { // TODO Auto-generated method stub User u=null; Connection con=null; PreparedStatement pstmt=null; ResultSet rs=null; try { Class.forName("com.mysql.jdbc.Driver");//注册对应的驱动 //url,"root","root" String url= "jdbc:mysql://localhost:3306/dy?useUnicode=true&characterEncoding=utf-8&useSSL=false"; con = DriverManager.getConnection(url,"root","root"); String RequestSql="select *from s_user where uname=?"; pstmt = con.prepareStatement(RequestSql); //name=name.replaceAll(" ", ""); pstmt.setString(1,name); rs=pstmt.executeQuery(); if(rs.next()){ u = new User(); u.setHeroName(rs.getString("uname")); u.setLifeNum(rs.getInt("lifenum")); u.setType(rs.getString("type")); u.setDesc(rs.getString("desc")); } } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); }finally{ try { if(rs!=null) rs.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { if(pstmt!=null) pstmt.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } try { if(con!=null) con.close(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } } return u; } }
工程结构：
效果展示：
数据库设计：