HttpURLConnHelper

最新推荐文章于 2020-06-24 08:39:51 发布

唐宋博宇

最新推荐文章于 2020-06-24 08:39:51 发布

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CC 4.0 BY-SA版权

本文链接：https://blog.youkuaiyun.com/shanhouwang/article/details/13023193

本文介绍了一个用于从URL加载流和字节的HTTP URL连接助手类，包括加载流的方法和加载字节的方法，以及POST提交数据的方法。

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package com.shanhw.practice;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.HttpURLConnection;
import java.net.URL;

public class HttpURLConnHelper {

	/**
	 * @param url
	 * @return 返回一个InputStream
	 */
	public static InputStream loadStreamFromURL(String url) {
		BufferedInputStream bis = null;
		HttpURLConnection httpConn = null;
		URL urlObj;
		try {
			urlObj = new URL(url);
			httpConn = (HttpURLConnection) urlObj.openConnection();
			if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				bis = new BufferedInputStream(httpConn.getInputStream());
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (bis != null) {
					bis.close();
				}
				if (httpConn != null) {
					httpConn.disconnect();
				}
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

		return bis;
	}

	/**
	 * @param url
	 * @return 返回一个byte[]
	 */
	public static byte[] loadByteFromURL(String url) {

		byte[] byteObj = null;
		HttpURLConnection httpConn = null;
		URL urlObj;
		try {
			urlObj = new URL(url);
			httpConn = (HttpURLConnection) urlObj.openConnection();
			if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				IOHelper io = new IOHelper();
				byteObj = io.streamToByte(httpConn.getInputStream());
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			if (httpConn != null) {
				httpConn.disconnect();
			}
		}
		return byteObj;
	}

	/**
	 * @param url
	 * @param parameters
	 * @return
	 */
	public static String doPostSubmit(String url, String parameters) {
		BufferedInputStream bis = null;
		BufferedOutputStream bos = null;
		URL urlObj = null;
		HttpURLConnection httpConn = null;

		String returnData = null;
		try {
			urlObj = new URL(url);
			httpConn = (HttpURLConnection) urlObj.openConnection();
			httpConn.setRequestMethod("POST");
			httpConn.setDoOutput(true);

			if (parameters != null) {
				bos = new BufferedOutputStream(httpConn.getOutputStream());
				bos.write(parameters.getBytes());
				bos.flush();
			}

			if (httpConn.getResponseCode() == HttpURLConnection.HTTP_OK) {
				bis = new BufferedInputStream(httpConn.getInputStream());
				IOHelper io = new IOHelper();
				returnData = io.streamToString(bis);
			}
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				if (bis != null) {
					bis.close();
				}
				if (bos != null) {
					bos.close();
				}
				httpConn.disconnect();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}
		return returnData;
	}
}