使用java模拟向web服务器发送get和post请求

最新推荐文章于 2024-02-28 10:45:58 发布

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最新推荐文章于 2024-02-28 10:45:58 发布

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分类专栏： java 文章标签： web服务器 java

本文链接：https://blog.youkuaiyun.com/u014712614/article/details/23944205

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本文详细介绍了HTTP请求的GET和POST方法实现，包括URL构造、输入流读取、字符串转换等关键步骤，以及异常处理机制。

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新手试试水，写的不好的地方还望各位大神指教。

package com.weixin.base.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;
import java.net.URLConnection;
import java.util.HashMap;
import java.util.Map;


/**
 * 实现http连接
 * 
 * @author dong
 * 
 */
public class HttpImpl implements Http {
	/* (non-Javadoc)
	 * @see com.weixin.base.util.HttpAPI#sendGet(java.lang.String)
	 */
	@Override
	public String sendGet(String requestUrl) {
		StringBuffer buffer = new StringBuffer();
		try {
			URL url = new URL(requestUrl);
			
			//获得资源输入流
			InputStream inputStream = url.openStream();
			
			// 将返回的输入流转换成字符串
			InputStreamReader inputStreamReader = new InputStreamReader(
					inputStream, "utf-8");
			BufferedReader bufferedReader = new BufferedReader(
					inputStreamReader);

			String str = null;
			while ((str = bufferedReader.readLine()) != null) {
				buffer.append(str);
			}
			bufferedReader.close();
			inputStreamReader.close();
			// 释放资源
			inputStream.close();
			inputStream = null;
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return buffer.toString();
	}

	/* (non-Javadoc)
	 * @see com.weixin.base.util.HttpAPI#sendPost(java.lang.String, java.lang.String)
	 */
	@Override
	public String sendPost(String requestUrl, String outputStr) {
		StringBuffer buffer = new StringBuffer();

		try {
			URL url = new URL(requestUrl);
			URLConnection httpUrlConn = url.openConnection();
			//
			httpUrlConn.setDoOutput(true);
			httpUrlConn.setDoInput(true);
			
			OutputStream outputStream = httpUrlConn.getOutputStream();
			// 当有数据需要提交时
			if (null != outputStr) {
				// 注意编码格式，防止中文乱码
				outputStream.write(outputStr.getBytes("UTF-8"));	
			}
			outputStream.close();

			// 将返回的输入流转换成字符串
			InputStream inputStream = httpUrlConn.getInputStream();
			InputStreamReader inputStreamReader = new InputStreamReader(
					inputStream, "utf-8");
			BufferedReader bufferedReader = new BufferedReader(
					inputStreamReader);

			String str = null;
			while ((str = bufferedReader.readLine()) != null) {
				buffer.append(str);
			}
			bufferedReader.close();
			inputStreamReader.close();
			// 释放资源
			inputStream.close();
			inputStream = null;
			// httpUrlConn.;
		} catch (MalformedURLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (ProtocolException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (UnsupportedEncodingException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}

		return buffer.toString();
	}

	public static void main(String[] args) {

	}
}