http协议访问网络资源图片---GET方法

首先打开myEclipse建立一个web项目，而后将咱们要访问的图片资源放在WEBRoot文件夹先，而后将项目部署在Tomcate服务器上，再者就是启动服务器。

而后再eclipse中建立一个普通的java项目，模仿客户端，使用Http协议的Get方法访问图片资源，具体代码以下：

package com.http.get;

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




public class HttpUtils {

	// 本地的IP地址是169.254.74.214
	private static String URL_PATH = "http://169.254.167.66:8080/myhttp/yuliyan.png";

	public HttpUtils() {

	}

	public static void saveImageToDisk() {
		InputStream inputStream = getInputStream();
		byte[] data = new byte[1024];
		FileOutputStream fileOutputStream = null;
		int len = 0;
		try {
			fileOutputStream = new FileOutputStream("c:\\oue.jpg");
			while ((len = inputStream.read()) != -1) {
				fileOutputStream.write(data, 0, len);
			}

		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (inputStream != null) {
				try {
					inputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
			if (fileOutputStream != null) {
				try {
					fileOutputStream.close();
				} catch (IOException e) {
					e.printStackTrace();
				}
			}
		}

	}

	public static InputStream getInputStream() {
		InputStream inputStream = null;
		HttpURLConnection httpsURLConnection = null;
		try {
			URL url = new URL(URL_PATH);

			if (url != null) {
				httpsURLConnection = (HttpURLConnection) url.openConnection();
				httpsURLConnection.setConnectTimeout(3000); // 设置网络的超时时间
				httpsURLConnection.setRequestMethod("GET"); // 设置本次http请求使用GET方式
				int responseCode = httpsURLConnection.getResponseCode();
				if (responseCode == 200) {
					// 从服务器端获得输入流
					inputStream = httpsURLConnection.getInputStream();
				}
			}
		} catch (MalformedURLException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}

		return inputStream;
	}

	public static void main(String[] args) {
		// 从服务器得到图片完成保存图片在本地
		saveImageToDisk();
	}

}

注意： 咱们在建立客户端访问服务器端得代码中要先将commons-httpclient-3.0.1.jar导入带项目中，而后再建立java类，同时要注意在敲

HttpURLConnection httpsURLConnection = null;
		try {
			URL url = new URL(URL_PATH);

			if (url != null) {
				httpsURLConnection = (HttpURLConnection) url.openConnection();
				httpsURLConnection.setConnectTimeout(3000); // 设置网络的超时时间
				httpsURLConnection.setRequestMethod("GET"); // 设置本次http请求使用GET方式
				int responseCode = httpsURLConnection.getResponseCode();

这段代码时不要导javax.net.ssl.HttpsURLConnection，要导入import java.net.HttpURLConnection;

，疑问：我在运行完毕上述代码以后发如今c盘下的图片资源存在，可是看不了，对比服务器端得图片大小是18008字节，而本地图片大小却达到了14163368字节，这让我很是费解，但愿高手们能给我指点迷津