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

(=1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packagecom;importjava.io.BufferedReader;importjava.io.IOException;importjava.io.lnputStreamReader;importjava.io.OutputStream;importjava.io.OutputStreamWriter;.HttpURLConnection;.URL;importjavax.servlet.ServletException;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@SuppressWarnings("serial")publicclassIOServletextendsHttpServlet日El{申申/**卜*/卜*/申申publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException申申System.out.println("beginsend");I StringinputParam="<?xmlversion=\"1.0\"encoding=\"UTF-8\"?><page><username〉爱心天使</usernaem><age>26</age></page>";URLurl=null;HttpURLConnectionhttpConn=null;OutputStreamoutput=null;

OutputStreamWriteroutr=null;url=newURL(":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=newOutputStreamWriter(output);//写入请求参数outr.write(inputParam.toString().toCharArray(),0,inputParam.toString().length());outr.flush();outr.close();System.out.println("sendok");intcode=httpConn.getResponseCode();System.out.println("code"+code);System.out.println(httpConn.getResponseMessage());〃读取响应内容StringsCurrentLine="";StringsTotalString="";申申卜申申if申申卜申申{java.io.lnputStreamis=httpConn.getInputStream();BufferedReaderreader=newBufferedReader(newInputStreamReader(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);publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{

this.doGet(request,response);}ReadServlet（相当于被请求的服务器）:packagecom;importjava.io.IOException;importjava.io.PrintWriter;importjavax.servlet.ServletException;importjavax.servlet.ServletInputStream;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;@SuppressWarnings("serial")publicclassReadServletextendsHttpServlet日EE1{publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)throwsIOException{System.out.println("beginread");ServletInputStreaminStream=request.getInputStream();//取HTTP请求流intsize=request.getContentLength();//取HTTP请求流长度byte[]buffer=newbyte[size];//用于缓存每次读取的数据Ibyte[]in_b=newbyte[size];//用于存放结果的数组Iintcount=0;intrbyte=0;//循环读取申申II申申II申申I

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卜{rbyte=inStream.read(buffer);//每次实际读取长度存于rbyte中sfljfor(inti=0;i<rbyte;i++){in_b[count+i]=buffer[i];}count+=rbyte;}System.out.println("result:"+newString(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");PrintWriterout=response.ge