java通过http下载图片_使用http协议将服务器图片下载到本地

1 服务器端新建java web项目

该图片资源路径为   http://localhost:8080/httppost/android.jpg

2 客服端

HttpUtils.java 代码如下：

package com.zwh.http;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpUtils {

private static String URL_PATH = "http://localhost:8080/httppost/android.jpg";

public HttpUtils() {

// TODO Auto-generated constructor stub

}

public static void saveToDisk() {

// 获取输入流

InputStream inputStream = getInputStream();

byte[] date = new byte[1024];

int len = 0;

FileOutputStream fileOutputStream = null;

try {

fileOutputStream = new FileOutputStream("F://example.jpg");

while ((len = inputStream.read(date)) != -1) {

fileOutputStream.write(date, 0, len);

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

} finally {

try {

if (inputStream != null) {

inputStream.close();

}

if (fileOutputStream != null) {

fileOutputStream.close();

}

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}

/**

* @return

*/

public static InputStream getInputStream() {

InputStream inputStream = null;

HttpURLConnection httpURLConnection = null;

try {

URL url = new URL(URL_PATH);

httpURLConnection = (HttpURLConnection) url.openConnection();

// 设置连接网络的超时时间

httpURLConnection.setConnectTimeout(3000);

httpURLConnection.setDoInput(true);

httpURLConnection.setRequestMethod("GET");

int responseCode = httpURLConnection.getResponseCode();

if (responseCode == 200) {

inputStream = httpURLConnection.getInputStream();

}

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

return inputStream;

}

public static void main(String[] args) {

HttpUtils httpUtils = new HttpUtils();

httpUtils.saveToDisk();

}

}