HTTP请求自动重发有关问题

package com.umpay.preboss.test;import java.io.BufferedReader;import java.io.DataInputStream;import java.io.FileInputStream;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStream;import java.net.HttpURLConnection;import java.net.URL;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import com.umpay.preboss.httpServer.Socklet2HTTP;public class HttpPostTest {    private static Log _log = LogFactory.getLog(Socklet2HTTP.class);    public static void main(String args[]) throws Exception {        DataInputStream dis = new DataInputStream(new FileInputStream(                "bin\\test.xml"));        StringBuffer sb = new StringBuffer();        String temp = null;        temp = dis.readLine();        while (temp != null) {            sb.append(temp);            temp = dis.readLine();        }        String url ="http://localhost:9000/dobusiness";        StringBuffer sbody = new StringBuffer();        sbody.append("$xmldata=").append(sb.toString());        _log.debug("发送报文[" + sbody + "]");        byte[] httpReq = sbody.toString().getBytes();        _log.info("length = " + httpReq.length);        URL httpurl = new URL(url);        HttpURLConnection httpConn = (HttpURLConnection) httpurl                .openConnection();        //httpConn.setConnectTimeout(10000);        httpConn.setRequestMethod("POST");        httpConn.setDoOutput(true);        httpConn.setDoInput(true);        httpConn.setUseCaches(false);                //httpConn.set        String httpRes = "";        try {            _log.debug("urlc.send()...");            // 发送请求            OutputStream os = httpConn.getOutputStream();            os.write(httpReq); // 发送body数据            os.flush();            os.close();            _log.debug("urlc.recv()...");            // 判断响应            int rcode = httpConn.getResponseCode();            if (rcode != HttpURLConnection.HTTP_OK) {                throw new Exception("rcode!=HttpURLConnection.HTTP_OK");            }            // 接受报文体信息            InputStream in = httpConn.getInputStream();            BufferedReader br = new BufferedReader(new InputStreamReader(in));            StringBuffer sb1 = new StringBuffer();            String s = "";            while ((s = br.readLine()) != null) {                sb1.append(s + "\r\n");            }            in.close();            System.out.println(sb1.toString());        } catch (Exception e) {            _log.error(e);        } finally {            httpConn.disconnect();        }    }}