Android开发之下载服务器上的一张图片到本地java代码实现HttpURLConnection

Posted 2022-11-02

package com.david.HttpURLConnectionDemo;

import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class Test02 

  /**
   * HttpURLConnection
   *    下载服务器上的一张图片到本地
   * @param args
   *
     * 
      * 微博：http://weibo.com/mcxiaobing 
   */
  public static void main(String[] args) 
    try 
      URL url = new URL("http://10.2.163.69:8080/SZ1507Web/img/dog01.jpg");
      HttpURLConnection conn =  null;
      try 
        URLConnection urlCon = url.openConnection(); // 获取一个URLConnection
        conn = (HttpURLConnection)urlCon;
        conn.setConnectTimeout(5000);//设置连接超时时长
        int code = conn.getResponseCode();//返回连接状态
        if(code == 200) //表示连接成功
          System.out.println("连接成功...");
          InputStream is = null;
          OutputStream os = null;
          try
            is = conn.getInputStream(); //获取 输入流
            os = new FileOutputStream("dog1.jpg");
            byte b[] = new byte[1024];
            int num = 0;
            while((num = is.read(b)) != -1)
              os.write(b,0,num);
            
          catch(IOException e)
            e.printStackTrace();
          finally
            is.close();
            os.close();
          
        else
          System.out.println("网络连接异常");
        
       catch (IOException e) 
        e.printStackTrace();
      finally
        conn.disconnect();//关闭
        System.out.println("文件下载完成...");
      
     catch (MalformedURLException e) 
      e.printStackTrace();