httpurlconnection请求数据流的写入(write)和读取(read)

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1、HttpURLConnection请求数据流的写入(write)和读取(read)URLConnection类给应用程序和web资源之间架设起了通信的桥梁，这些web资源通常是通过url来标记的,本文将讲述如何使用HttpURLConnection来访问web页面(发送数据流)和读取数据流。在Servlet中对于需要用post方式(get会暴露参数)写入参数的时候就用到了HttpURLConnection.请求的Servlet，也可以写入main方法中进行测试package com;import java.io.BufferedReader;import java.io.

2、IOException;import java.io.InputStreamReader;import java.io.OutputStream;import java.io.OutputStreamWriter;import java.net.HttpURLConnection;import java.net.URL;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import 

3、javax.servlet.http.HttpServletResponse;@SuppressWarnings("serial")public class IOServlet extends HttpServlet{    /** *//**     * 对于主动请求其它接口的参数流写入(POST方式)     */    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException  

4、  {        System.out.println("begin send");        String inputParam = "爱心天使26";        URL url = null;        HttpURLConnection httpConn = null;        OutputStream output = null;        OutputStreamW

5、riter outr = null;        url = new URL("http://127.0.0.1:8888/iotest/ReadServlet");        httpConn = (HttpURLConnection) url.openConnection();        HttpURLConnection.setFollowRedirects(true);        httpConn.setDoOutput(true);        httpConn.setRequestMethod("POST");        httpConn.

6、setRequestProperty("Content-Type", "text/xml");        httpConn.connect();        output = httpConn.getOutputStream();        outr = new OutputStreamWriter(output);        // 写入请求参数        outr.write(inputParam.toString().toCharArray(), 0, inputParam                .toString().length()); 

7、       outr.flush();        outr.close();        System.out.println("send ok");        int code = httpConn.getResponseCode();        System.out.println("code " + code);        System.out.println(httpConn.getResponseMessage());                //读取响应内容        String s