package com.hpu.test;

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 {

	// 自定义的web服务器的资源

	private static String URL_PATH = "http://localhost:8080/TestGet/1.jpg";

	public HttpUtils() {

		// TODO Auto-generated constructor stub

	}

	public static void saveImageToDisk() throws IOException {

		InputStream inputStream = getInputStream();

		byte[] data = new byte[1024];

		int len = 0;

		FileOutputStream fileOutputStream = null;

		try {

			fileOutputStream = new FileOutputStream("D:\\p.jpg");

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

				fileOutputStream.write(data, 0, len);

			}

		} catch (Exception e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		} finally {

			if (inputStream != null) {

				try {

					inputStream.close();

				} catch (Exception e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

			}

			if (fileOutputStream != null) {

				try {

					fileOutputStream.close();

				} catch (Exception e) {

					// TODO Auto-generated catch block

					e.printStackTrace();

				}

			}

		}

	}

	/**

	 * 获得服务器端数据，以InputStream形式返回

	 *

	 * @return

	 * @throws IOException

	 */

	public static InputStream getInputStream() throws IOException {

		InputStream inputStream = null;

		HttpURLConnection httpURLConnection = null;

		try {

			URL url = new URL(URL_PATH);

			if (url != null) {

				httpURLConnection = (HttpURLConnection) url.openConnection();

				// 设置连接网络的超时时间

				httpURLConnection.setConnectTimeout(3000);

				httpURLConnection.setDoInput(true);

				// 设置本次http请求使用get方式请求

				httpURLConnection.setRequestMethod("GET");

				int responseCode = httpURLConnection.getResponseCode();

				if (responseCode == 200) {

					// 从服务器获得一个输入流

					inputStream = httpURLConnection.getInputStream();

				}

			}

		} catch (MalformedURLException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

		return inputStream;

	}

	public static void main(String[] args) throws IOException {

		// 从服务器获得图片保存到本地

		saveImageToDisk();

		System.out.println("传输步骤完毕");

	}

}