HttpURLConnection请求数据流的写入(write)和读取(read)
2013-01-30 17:20
706 查看
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
ReadServlet(相当于被请求的服务器):
打开页面:http://localhost:8888/iotest/IOServlet
你会在后台看到如下输出说明你已经成功了:
源码下载:here
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.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 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 { System.out.println("begin send"); String inputParam = "<?xml version=\"1.0\" encoding=\"UTF-8\"?><page><username>爱心天使</usernaem><age>26</age></page>"; URL url = null; HttpURLConnection httpConn = null; OutputStream output = null; OutputStreamWriter 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.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()); 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 sCurrentLine = ""; String sTotalString = ""; if (code == 200) { java.io.InputStream is = httpConn.getInputStream(); BufferedReader reader = new BufferedReader( new InputStreamReader(is)); while ((sCurrentLine = reader.readLine()) != null) if (sCurrentLine.length() > 0) sTotalString = sTotalString + sCurrentLine.trim(); } else { sTotalString = "远程服务器连接失败,错误代码:" + code; } System.out.println("response:" + sTotalString); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }
ReadServlet(相当于被请求的服务器):
package com; import java.io.IOException; import java.io.PrintWriter; import javax.servlet.ServletException; import javax.servlet.ServletInputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; @SuppressWarnings("serial") public class ReadServlet extends HttpServlet { public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException { System.out.println("begin read"); ServletInputStream inStream = request.getInputStream(); // 取HTTP请求流 int size = request.getContentLength(); // 取HTTP请求流长度 byte[] buffer = new byte[size]; // 用于缓存每次读取的数据 byte[] in_b = new byte[size]; // 用于存放结果的数组 int count = 0; int rbyte = 0; // 循环读取 while (count < size) { rbyte = inStream.read(buffer); // 每次实际读取长度存于rbyte中 sflj for (int i = 0; i < rbyte; i++) { in_b[count + i] = buffer[i]; } count += rbyte; } System.out.println("result:" + new String(in_b,0,in_b.length)); response.setContentType("text/html"); //注意响应中文数据时要设置 response.setCharacterEncoding("GBK"); PrintWriter out = response.getWriter(); //回与响应数据 out.write("您已经请求成功,这是响应数据!"); } public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doGet(request, response); } }
打开页面:http://localhost:8888/iotest/IOServlet
你会在后台看到如下输出说明你已经成功了:
begin send send ok begin read result:<?xml version="1.0" encoding="UTF-8"?><page><username>爱心天使</usernaem><age>26</age></page> code 200 OK response:您已经请求成功,这是响应数据!
源码下载:here
相关文章推荐
- HttpURLConnection请求数据流的写入(write)和读取(read)
- HttpURLConnection请求数据流的写入(write)和读取(read)
- HttpURLConnection 请求数据流的写入(write)和读取(read)
- HttpURLConnection请求数据流的写入(write)和读取(read)
- Android 网络编程之HttpURLConnection(conn.getResponseCode() != 200,从url读取写入数据)
- HttpURLConnection的post请求,什么时候发出,writeData存在什么地方
- 利用HttpURLConnection发送post请求上传多个文件
- 第六章 Read-Write Lock(适合读取比写入次数频繁的时候)
- Android支持https的处理方式2----HttpURLConnection请求https处理方式
- 用HttpURLConnection 在Java后台发送请求并接收返回数据
- httpURLConnection-网络请求的两种方式-get请求和post请求
- 使用HttpURLConnection和使用HttpClient方式请求网络采用get方式和post方式请求数据
- HttpURLConnection的get请求
- Java利用HttpURLConnection发送post请求上传文件
- HttpUrlConnection用get和post请求发送参数
- HttpURLConnection请求
- 网络请求(HttpUrlConnection/HttpClient)
- Java利用HttpURLConnection发送post请求上传文件
- HttpUrlConnection和HttpClient两种方式获取GET和POST请求
- 用HttpURLConnection模拟post请求,不post的问题