javaIO-学习笔记

 package IOTest;

 import java.io.File;

 import java.io.FileInputStream;

 import java.io.FileOutputStream;

 import java.io.IOException;

 import java.io.ObjectInput;

 import java.io.ObjectInputStream;

 import java.io.ObjectOutput;

 import java.io.RandomAccessFile;

 public class IOMain {

     public static void main(String[] args) throws IOException {

         /*

          * 1

          */

 //        try (FileReader fr = new FileReader("E:/Workspase/MyEclipse 2015 CI/Shulie/src/A2.java")) {

 //            char[] cbuf = new char[32];

 //            int hasRead = 0;

 //            while((hasRead = fr.read(cbuf))>0){

 //                System.out.println(new String(cbuf, 0, hasRead));

 //            }

 //

 //        } catch (FileNotFoundException e) {

 //            // TODO Auto-generated catch block

 //            e.printStackTrace();

 //        }

         /*

          * 2 节点流

          */

 //        File f = new File("newfile.txt");

 //

 //        try(

 //                FileInputStream fis = new FileInputStream("E:/Workspase/MyEclipse 2015 CI/Shulie/src/A2.java");

 //                FileOutputStream fos = new FileOutputStream(f))

 //        {

 //            byte[] buf = new byte[1024];

 //            int hasRead = 0;

 //            while((hasRead = fis.read(buf))>0){

 //                fos.write(buf, 0, hasRead);

 //            }

 //

 //        }catch(Exception e){

 //            e.printStackTrace();

 //        }

         /*

          * 3  转换流

          */

 //        try (InputStreamReader reader = new InputStreamReader(System.in);

 //            BufferedReader bf = new BufferedReader(reader)    ){

 //            String line = null;

 //            while((line = bf.readLine()) !=null){

 //                if("exit".equals(line)){

 //                    System.exit(1);

 //                }

 //                System.out.println(line);

 //            }

 //        } catch (Exception e) {

 //            // TODO Auto-generated catch block

 //            e.printStackTrace();

 //        }

         /*

          * 4 重定向输出

          */

 //        try (PrintStream ps = new PrintStream(new FileOutputStream("out.txt"))) {

 //

 //            System.setOut(ps);

 //            System.out.println(new Scanner(System.in).next());

 //            System.out.print(new IOMain());

 //        } catch (Exception e) {

 //            // TODO Auto-generated catch block

 //            e.printStackTrace();

 //        }

 //

 //

         /*

          * 5 RandomAccessFile

          */

 //

 //        try (RandomAccessFile raf = new RandomAccessFile("newfile.txt", "rw");) {

 //            System.out.println("指针初始位置："+raf.getFilePointer());

 //            raf.seek(300);

 //            byte[] bbuff = new byte[1024];

 //            int hasRead = 0;

 //            while((hasRead = raf.read(bbuff)) > 0){

 //                System.out.println(new String(bbuff, 0, hasRead));

 //            }

 //            raf.seek(raf.length());

 //            raf.write("\r\n追加的内容!\r\n".getBytes());

 //        } catch (Exception e) {

 //            // TODO Auto-generated catch block

 //            e.printStackTrace();

 //        }

 //

 //

 //        insert("out.txt", 3, "\r\n插入的内容\r\n");

 //        FileInputStream fis = new FileInputStream(new File("out.txt"));

 //        byte[] bbuff = new byte[1024];

 //        int hasRead = 0;

 //        while((hasRead = fis.read(bbuff)) > 0){

 //            System.out.println(new String(bbuff, 0, hasRead));

 //        }

 //

 //

         /*

          * 6  序列化

          */

 //        try (ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream("object.txt"));) {

 //            Person p1 = new Person("Jeff", 23);

 //            oos.writeObject(p1);

 //        } catch (Exception e) {

 //            // TODO Auto-generated catch block

 //            e.printStackTrace();

 //        }

         try (ObjectInputStream oip = new ObjectInputStream(new FileInputStream("object.txt"));) {

             Person p2 = (Person) oip.readObject();

             System.out.println("name:"+p2.getName()+"\n"+"age:"+p2.getAge());

         } catch (ClassNotFoundException e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         }

     }

     public static void insert(String fileName, long pos, String insertContent) throws IOException{

         File temp = File.createTempFile("temp", null);

         temp.deleteOnExit();

         try (

         RandomAccessFile raf = new RandomAccessFile(fileName, "rw");

         FileOutputStream fos = new FileOutputStream(temp);

         FileInputStream fis = new FileInputStream(temp);) {

             raf.seek(pos);

             byte[] buff = new byte[64];

             int hasRead = 0;

             while((hasRead = raf.read(buff))>0){

                 fos.write(buff, 0, hasRead);

             }

             raf.seek(pos);

             raf.write(insertContent.getBytes());

             while((hasRead = fis.read(buff))>0){

                 raf.write(buff, 0, hasRead);

             }

         } catch (Exception e) {

             // TODO Auto-generated catch block

             e.printStackTrace();

         }

     }

 }

 class Person implements java.io.Serializable{

     private String name;

     private int age;

     public Person(String name, int age){

         this.name = name;

         this.age = age;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

 }

 class PersonNew implements java.io.Externalizable{

     private String name;

     private int age;

     public PersonNew(String name, int age){

         this.name = name;

         this.age = age;

     }

     public String getName() {

         return name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public int getAge() {

         return age;

     }

     public void setAge(int age) {

         this.age = age;

     }

     @Override

     public void writeExternal(ObjectOutput out) throws IOException {

         out.writeObject(new StringBuffer(name).reverse());

         out.writeInt(age);

     }

     @Override

     public void readExternal(ObjectInput in) throws IOException,

             ClassNotFoundException {

         this.name = ((StringBuffer)in.readObject()).reverse().toString();

         this.age = in.readInt();

     }

 }