Java IO流详尽解析 - JAVA

LLENHOLT"; ByteArrayInputStream input=new ByteArrayInputStream(str.getBytes()); ByteArrayOutputStream output=new ByteArrayOutputStream(); int temp=0; while((temp=input.read())!=-1){ char ch=(char)temp; output.write(Character.toLowerCase(ch)); } String outStr=output.toString(); input.close(); output.close(); System.out.println(outStr); } }

【案例】验证管道流：进程间通信

/**
 * 验证管道流
 * */
import java.io.*;
 
/**
 * 消息发送类
 * */
class Send implements Runnable{
   private PipedOutputStream out=null;
   public Send() {
       out=new PipedOutputStream();
    }
   public PipedOutputStream getOut(){
       return this.out;
    }
   public void run(){
       String message="hello , Rollen";
       try{
           out.write(message.getBytes());
       }catch (Exception e) {
           e.printStackTrace();
       }try{
           out.close();
       }catch (Exception e) {
           e.printStackTrace();
       }
    }
}
 
/**
 * 接受消息类
 * */
class Recive implements Runnable{
   private PipedInputStream input=null;
   public Recive(){
       this.input=new PipedInputStream();
    }
   public PipedInputStream getInput(){
       return this.input;
    }
   public void run(){
       byte[] b=new byte[1000];
       int len=0;
       try{
           len=this.input.read(b);
       }catch (Exception e) {
           e.printStackTrace();
       }try{
           input.close();
       }catch (Exception e) {
           e.printStackTrace();
       }
       System.out.println("接受的内容为 "+(new String(b,0,len)));
    }
}
/**
 * 测试类
 * */
class hello{
   public static void main(String[] args) throws IOException {
       Send send=new Send();
       Recive recive=new Recive();
        try{
//管道连接
           send.getOut().connect(recive.getInput());
       }catch (Exception e) {
           e.printStackTrace();
       }
       new Thread(send).start();
       new Thread(recive).start();
    }
}

【案例】DataOutputStream类示例

import java.io.DataOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
public class DataOutputStreamDemo{
   public static void main(String[] args) throws IOException{
       File file = new File("d:" + File.separator +"hello.txt");
       char[] ch = { 'A', 'B', 'C' };
       DataOutputStream out = null;
       out = new DataOutputStream(new FileOutputStream(file));
       for(char temp : ch){
           out.writeChar(temp);
       }
       out.close();
    }
}

【案例】ZipOutputStream类

先看一下ZipOutputStream类的继承关系

java.lang.Object

java.io.OutputStream

java.io.FilterOutputStream

java.util.zip.DeflaterOutputStream

java.util.zip.ZipOutputStream

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
 
public class ZipOutputStreamDemo1{
   public static void main(String[] args) throws IOException{
       File file = new File("d:" + File.separator +"hello.txt");
       File zipFile = new File("d:" + File.separator +"hello.zip");
       InputStream input = new FileInputStream(file);
       ZipOutputStream zipOut = new ZipOutputStream(new FileOutputStream(
                zipFile));
       zipOut.putNextEntry(new ZipEntry(file.getName()));
       // 设置注释
       zipOut.setComment("hello");
       int temp = 0;
       while((temp = input.read()) != -1){
           zipOut.write(temp);
       }
       input.close();
       zipOut.close();
    }
}

【案例】ZipOutputStream类压缩多个文件

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
 
/**
 *

Java IO流详尽解析(三)