httppost

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;

public class HttpRequest {

    /**
     * Send the request of the POST method to the specified URL
     *
     * @param url
     * The URL to send the request
     * @param param
     * The request parameter,
     * the response result of the remote resource represented by @return
     */
    public static String sendPost(String url, String param) {
        PrintWriter out = null;
        BufferedReader in = null;
        String result = "";
        try {
            URL realUrl = new URL(url);
            // Open connection to URL
            URLConnection conn = realUrl.openConnection();
            // Set common request properties
            conn.setRequestProperty("accept", "*/*");
            conn .setRequestProperty("connection", "Keep-Alive");
            conn.setRequestProperty("user-agent",
                    "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
            // must be set when sending POST requests The following two lines
            conn.setDoOutput(true);
            conn.setDoInput(true);
            // Get the output stream corresponding to the URLConnection object
            out = new PrintWriter(conn.getOutputStream());
            // Send request parameters
            out.print(param);
            // flush the buffer of the output stream
            out.flush();
            // define the BufferedReader input stream to read the URL's response
            in = new BufferedReader(
                    new InputStreamReader(conn.getInputStream()));
            String line ;
            while ((line = in.readLine()) != null) {
                result += line;
            }
        } catch (Exception e) {
            System.out.println("An exception occurred when sending POST request!"+e);
            e. printStackTrace();
        }
        //Use finally block to close output stream, input stream
        finally{
            try{
                if(out!=null){
                    out.close();
                }
                if(in!=null){
                    in.close();
                }
            }
            catch(IOException ex){
                ex.printStackTrace();
            }
        }
        return result;
    } 
public static void main(String[] args) {
String head ="<?xml version='1.0' encoding='GBK'?><PGK><DATA><![CDATA[";
String body = "<?xml version='1.0' encoding='GB2312'?><CBSERPPGK><INFO><FUNNAM>APPAYSAV</FUNNAM></INFO><APPAYSAVX><BNKTYP>CMB</BNKTYP><BUSTYP>0</BUSTYP><CCYNBR>10</CCYNBR><CLTACC>000110100002</CLTACC><CLTNBR>0003</CLTNBR><EPTDAT>2015-09-24</EPTDAT><EPTTIM>18:16:31</EPTTIM><EXTTX1>摘要信息03</EXTTX1><OPRMOD>3</OPRMOD><OPRTYP>202</OPRTYP><REFNBR>NF0001</REFNBR><REVACC>8512384214654654</REVACC><REVBNK>招商银行科技园支行</REVBNK><REVCIT>深圳市</REVCIT><REVEML></REVEML><REVMOB></REVMOB><REVNAM>招商银行</REVNAM><REVPRV>广东省</REVPRV><TRSAMT>200.00</TRSAMT><TRSUSE>摘要信息01</TRSUSE></APPAYSAVX></CBSERPPGK>";
        String end ="]]></DATA><CHECKCODE>Z87E4CD44</CHECKCODE></PGK>";
        //其中127.1.0.1 是ip地址,1234 是端口号
String sr=HttpRequest.sendPost("http://127.0.0.1:1234", head+body+end);
        System.out.println(sr);
    }
}