(=1讀取(read)URLConnection類給應(yīng)用程序和web資源之間架設(shè)起了通信的橋梁，這些web資源通常是通過(guò)url來(lái)標(biāo)記的,本文將講述如何使用HttpURLConnection來(lái)訪問(wèn)web頁(yè)面（發(fā)送數(shù)據(jù)流）和讀取數(shù)據(jù)流。在Servlet中對(duì)于需要用post方式（get會(huì)暴露參數(shù)）寫入?yún)?shù)的時(shí)候就用到了HttpURLConnection.請(qǐng)求的Servlet，也可以寫入main方法中進(jìn)行測(cè)試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〉愛(ài)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);//寫入請(qǐng)求參數(shù)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());〃讀取響應(yīng)內(nèi)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="遠(yuǎn)程服務(wù)器連接失敗,錯(cuò)誤代碼:"+code;}System.out.println("response:"+sTotalString);publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)throwsServletException,IOException{

this.doGet(request,response);}ReadServlet（相當(dāng)于被請(qǐng)求的服務(wù)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請(qǐng)求流intsize=request.getContentLength();//取HTTP請(qǐng)求流長(zhǎng)度byte[]buffer=newbyte[size];//用于緩存每次讀取的數(shù)據(jù)Ibyte[]in_b=newbyte[size];//用于存放結(jié)果的數(shù)組Iintcount=0;intrbyte=0;//循環(huán)讀取申申II申申II申申I

卜I

卜{rbyte=inStream.read(buffer);//每次實(shí)際讀取長(zhǎng)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");//注意響應(yīng)中文數(shù)據(jù)時(shí)要設(shè)置response.setCharacterEncoding("GBK");PrintWriterout=response.ge