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();
     }

 }