Java 通过Socket监听指定服务器（IP）的指定端口，及向指定服务器的指定端口发送信息

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客户端：向指定端口发送信息

package com.jszc.lottery.modules.longpay.util;import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.Socket;import java.net.UnknownHostException;import com.jszc.lottery.common.utils.MakeOrderNumUtil;public class RECV_UBANKNO {    public String go(String xmlInfo) throws UnknownHostException, IOException {        // 向服务器端发送请求，服务器IP地址和服务器监听的端口号        Socket client = new Socket("192.168.1.125", 12345);        // 通过printWriter 来向服务器发送消息        PrintWriter printWriter = new PrintWriter(client.getOutputStream());        System.out.println("连接已建立...");        // 发送消息        printWriter.println(xmlInfo);        printWriter.flush();        // InputStreamReader是低层和高层串流之间的桥梁        // client.getInputStream()从Socket取得输入串流        InputStreamReader streamReader = new InputStreamReader(client.getInputStream());        // 链接数据串流，建立BufferedReader来读取，将        //BufferReader链接到InputStreamReder        BufferedReader reader = new BufferedReader(streamReader);        String advice = reader.readLine();        reader.close();        return advice;    }    public static void main(String[] args) throws UnknownHostException,IOException {        StringBuilder sb = new StringBuilder();        sb.append("balabala");        // 提交请求        String utf8 = new String(sb.toString().getBytes("UTF-8"));        String unicode = new String(utf8.getBytes(), "UTF-8");        String gbk = new String(unicode.getBytes("GB2312"));        // String xml = new String();//GB18030        RECV_UBANKNO c = new RECV_UBANKNO();        String advice = c.go(gbk);        System.out.println("接收到服务器的消息 ：" + advice);    }}

package com.jszc.lottery.modules.longpay.util;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;

import com.jszc.lottery.common.utils.MakeOrderNumUtil;

public class RECV_UBANKNO {

public String go(String xmlInfo) throws UnknownHostException, IOException {    // 向服务器端发送请求，服务器IP地址和服务器监听的端口号    Socket client = new Socket("192.168.1.125", 12345);    // 通过printWriter 来向服务器发送消息    PrintWriter printWriter = new PrintWriter(client.getOutputStream());    System.out.println("连接已建立...");    // 发送消息    printWriter.println(xmlInfo);    printWriter.flush();    // InputStreamReader是低层和高层串流之间的桥梁    // client.getInputStream()从Socket取得输入串流    InputStreamReader streamReader = new InputStreamReader(            client.getInputStream());    // 链接数据串流，建立BufferedReader来读取，将BufferReader链接到InputStreamReder    BufferedReader reader = new BufferedReader(streamReader);    String advice = reader.readLine();    reader.close();    return advice;}public static void main(String[] args) throws UnknownHostException,        IOException {    // 拼接xml报文    /*     * <?xml version="1.0" encoding="GB2312" standalone="yes" ?> <TX>     * <REQUEST_SN>请求序列码</REQUEST_SN> <CUST_ID>客户号</CUST_ID>     * <USER_ID>操作员号</USER_ID> <PASSWORD>密码</PASSWORD>     * <TX_CODE>6W0201</TX_CODE> <LANGUAGE>CN</LANGUAGE> <TX_INFO>     * </TX_INFO> </TX>     */    StringBuilder sb = new StringBuilder();    MakeOrderNumUtil makeOrderNumUtil = new MakeOrderNumUtil();    makeOrderNumUtil.makeOrderNum();    String num = makeOrderNumUtil.makeOrderNum();    sb.append("<?xml version='1.0' encoding='GB2312' standalone='yes' ?>  ");    sb.append("<TX>");    sb.append("<REQUEST_SN>" + num + "</REQUEST_SN>");// 请求序列码    sb.append("<CUST_ID>ZJ33000009175763101</CUST_ID>");// 客户号    sb.append("<USER_ID>WLPT01</USER_ID>");// 操作员号    sb.append("<PASSWORD>123456</PASSWORD>");// 密码    sb.append("<TX_CODE>6W0201</TX_CODE>");// 交易请求码    sb.append("<LANGUAGE>CN</LANGUAGE> ");// 语言    sb.append("<TX_INFO>");    sb.append("</TX_INFO>");    sb.append("</TX>");    // 提交请求    /*     * 4、发送报文兼容GB2312和GB18030编码格式，返回报文为GB18030编码格式，     * 另需要测试一下发送报文编码格式为GB18030的情况下交易是否OK。     */    String utf8 = new String(sb.toString().getBytes("UTF-8"));    String unicode = new String(utf8.getBytes(), "UTF-8");    String gbk = new String(unicode.getBytes("GB2312"));    // String xml = new String();//GB18030    RECV_UBANKNO c = new RECV_UBANKNO();    String advice = c.go(gbk);    System.out.println("接收到服务器的消息 ：" + advice);}

}
服务器端，监听指定端口：

import java.io.BufferedReader;import java.io.IOException;import java.io.InputStreamReader;import java.io.PrintWriter;import java.net.ServerSocket;import java.net.Socket;public class SocketService {    //搭建服务器端    public static void main(String[] args) throws IOException{        SocketService socketService = new SocketService();        //1、a)创建一个服务器端Socket，即SocketService         socketService.oneServer();    }    public  void oneServer(){        try{            ServerSocket server=null;            try{                server=new ServerSocket(12347);                //b)指定绑定的端口，并监听此端口。                System.out.println("服务器启动成功");                //创建一个ServerSocket在端口5209监听客户请求            }catch(Exception e) {                    System.out.println("没有启动监听："+e);                    //出错，打印出错信息            }            Socket socket=null;            try{                socket=server.accept();                //2、调用accept()方法开始监听，等待客户端的连接                 //使用accept()阻塞等待客户请求，有客户                //请求到来则产生一个Socket对象，并继续执行            }catch(Exception e) {                System.out.println("Error."+e);                //出错，打印出错信息            }            //3、获取输入流，并读取客户端信息             String line;            BufferedReader in=new BufferedReader(new InputStreamReader(socket.getInputStream()));            //由Socket对象得到输入流，并构造相应的BufferedReader对象            PrintWriter writer=new PrintWriter(socket.getOutputStream());            //由Socket对象得到输出流，并构造PrintWriter对象            BufferedReader br=new BufferedReader(new InputStreamReader(System.in));            //由系统标准输入设备构造BufferedReader对象            System.out.println("Client:"+in.readLine());            //在标准输出上打印从客户端读入的字符串            line=br.readLine();            //从标准输入读入一字符串            //4、获取输出流，响应客户端的请求             while(!line.equals("end")){            //如果该字符串为 "bye"，则停止循环                writer.println(line);                //向客户端输出该字符串                writer.flush();                //刷新输出流，使Client马上收到该字符串                System.out.println("Server:"+line);                //在系统标准输出上打印读入的字符串                System.out.println("Client:"+in.readLine());                //从Client读入一字符串，并打印到标准输出上                line=br.readLine();                //从系统标准输入读入一字符串            } //继续循环            //5、关闭资源             writer.close(); //关闭Socket输出流            in.close(); //关闭Socket输入流            socket.close(); //关闭Socket            server.close(); //关闭ServerSocket        }catch(Exception e) {//出错，打印出错信息            System.out.println("Error."+e);        }    }}

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