使用JavaSocket编写发送TCP请求的工具类

package com.jadyer.util;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.InetSocketAddress;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 使用JavaSocket编写发送TCP请求的工具类
 * @see 类似的有一个Mina工具类:http://blog.csdn.net/jadyer/article/details/8088068
 * @see 欲查询Scoket的有关属性:http://blog.csdn.net/jadyer/article/details/8788272
 * @create Apr 5, 2013 9:25:34 PM
 * @author 玄玉<http://blog.csdn.net/jadyer>
 */
public class TCPUtil {
	private TCPUtil(){}
	
	/**
	 * 发送TCP请求
	 * @see 本方法默认的连接超时和读取超时均为30秒
	 * @see 编码与解码请求响应字节时,均采用双方约定的字符集,即本方法的第四个参数reqCharset
	 * @param IP         远程主机地址
	 * @param port       远程主机端口
	 * @param reqData    待发送报文的中文字符串形式
	 * @param reqCharset 该方法与远程主机间通信报文的编码字符集(编码为byte[]发送到Server)
	 * @return localPort--本地绑定的端口,reqData--请求报文,respData--响应报文,respDataHex--远程主机响应的原始字节的十六进制表示
	 */
	public static Map<String, String> sendTCPRequest(String IP, String port, String reqData, String reqCharset){
		Map<String, String> respMap = new HashMap<String, String>();
		OutputStream out = null;      //写
		InputStream in = null;        //读
		String localPort = null;      //本地绑定的端口(java socket, client, /127.0.0.1:50804 => /127.0.0.1:9901)
		String respData = null;       //响应报文
		String respDataHex = null;    //远程主机响应的原始字节的十六进制表示
		Socket socket = new Socket(); //客户机
		try {
			socket.setTcpNoDelay(true);
			socket.setReuseAddress(true);
			socket.setSoTimeout(30000);
			socket.setSoLinger(true, 5);
			socket.setSendBufferSize(1024);
			socket.setReceiveBufferSize(1024);
			socket.setKeepAlive(true);
			socket.connect(new InetSocketAddress(IP, Integer.parseInt(port)), 30000);
			localPort = String.valueOf(socket.getLocalPort());
			/**
			 * 发送TCP请求
			 */
			out = socket.getOutputStream();
			out.write(reqData.getBytes(reqCharset));
			/**
			 * 接收TCP响应
			 */
			in = socket.getInputStream();
			ByteArrayOutputStream bytesOut = new ByteArrayOutputStream();
			byte[] buffer = new byte[512];
			int len = -1;
			while((len=in.read(buffer)) != -1){
				bytesOut.write(buffer, 0, len);
			}
			/**
			 * 解码TCP响应的完整报文
			 */
			respData = bytesOut.toString(reqCharset);
			respDataHex = formatToHexStringWithASCII(bytesOut.toByteArray());
		} catch (Exception e) {
			System.out.println("与[" + IP + ":" + port + "]通信遇到异常,堆栈信息如下");
			e.printStackTrace();
		} finally {
			if (null!=socket && socket.isConnected() && !socket.isClosed()) {
				try {
					socket.close();
				} catch (IOException e) {
					System.out.println("关闭客户机Socket时发生异常,堆栈信息如下");
					e.printStackTrace();
				}
			}
		}
		respMap.put("localPort", localPort);
		respMap.put("reqData", reqData);
		respMap.put("respData", respData);
		respMap.put("respDataHex", respDataHex);
		return respMap;
	}
	
	/**
	 * 通过ASCII码将十进制的字节数组格式化为十六进制字符串
	 * @see 该方法会将字节数组中的所有字节均格式化为字符串
	 * @see 使用说明详见<code>formatToHexStringWithASCII(byte[], int, int)</code>方法
	 */
	private static String formatToHexStringWithASCII(byte[] data){
		return formatToHexStringWithASCII(data, 0, data.length);
	}
	
	
	/**
	 * 通过ASCII码将十进制的字节数组格式化为十六进制字符串
	 * @see 该方法常用于字符串的十六进制打印,打印时左侧为十六进制数值,右侧为对应的字符串原文
	 * @see 在构造右侧的字符串原文时,该方法内部使用的是平台的默认字符集,来解码byte[]数组
	 * @see 该方法在将字节转为十六进制时,默认使用的是<code>java.util.Locale.getDefault()</code>
	 * @see 详见String.format(String, Object...)方法和new String(byte[], int, int)构造方法
	 * @param data   十进制的字节数组
	 * @param offset 数组下标,标记从数组的第几个字节开始格式化输出
	 * @param length 格式长度,其不得大于数组长度,否则抛出java.lang.ArrayIndexOutOfBoundsException
	 * @return 格式化后的十六进制字符串
	 */
	private static String formatToHexStringWithASCII(byte[] data, int offset, int length){
		int end = offset + length;
		StringBuilder sb = new StringBuilder();
		StringBuilder sb2 = new StringBuilder();
		sb.append("\r\n------------------------------------------------------------------------");
		boolean chineseCutFlag = false;
		for(int i=offset; i<end; i+=16){
			sb.append(String.format("\r\n%04X: ", i-offset)); //X或x表示将结果格式化为十六进制整数
			sb2.setLength(0);
			for(int j=i; j<i+16; j++){
				if(j < end){
					byte b = data[j];
					if(b >= 0){ //ENG ASCII
						sb.append(String.format("%02X ", b));
						if(b<32 || b>126){ //不可见字符
							sb2.append(" ");
						}else{
							sb2.append((char)b);
						}
					}else{ //CHA ASCII
						if(j == i+15){ //汉字前半个字节
							sb.append(String.format("%02X ", data[j]));
							chineseCutFlag = true;
							String s = new String(data, j, 2);
							sb2.append(s);
						}else if(j == i&&chineseCutFlag){ //后半个字节
							sb.append(String.format("%02X ", data[j]));
							chineseCutFlag = false;
							String s = new String(data, j, 1);
							sb2.append(s);
						}else{
							sb.append(String.format("%02X %02X ", data[j], data[j + 1]));
							String s = new String(data, j, 2);
							sb2.append(s);
							j++;
						}
					}
				}else{
					sb.append("   ");
				}
			}
			sb.append("| ");
			sb.append(sb2.toString());
		}
		sb.append("\r\n------------------------------------------------------------------------");
		return sb.toString();
	}
}

下面是测试代码

public static void main(String[] args) {
	String reqData = "0003721000510110199201209222240000020120922000069347814303000700000813``中国联通交费充值`为号码18655228826交费充值100.00元`UDP1209222238312219411`10000```20120922`chinaunicom-payFeeOnline`UTF-8`20120922223831`MD5`20120922020103806276`1`02`10000`20120922223954`20120922`BOCO_B2C```http://192.168.20.2:5545/ecpay/pay/elecChnlFrontPayRspBackAction.action`1`立即支付,交易成功`";
	String IP = "127.0.0.1";
	String port = "9901";
	String reqCharset = "GB18030";
	Map<String, String> respMap = sendTCPRequest(IP, port, reqData, reqCharset);
	System.out.println("=============================================================================");
	System.out.println("请求报文如下");
	System.out.println(respMap.get("reqData"));
	System.out.println("=============================================================================");
	System.out.println("响应报文如下");
	System.out.println(respMap.get("respData"));
	System.out.println("=============================================================================");
	System.out.println("响应十六进制如下");
	System.out.println(respMap.get("respDataHex"));
	System.out.println("=============================================================================");
}

下面是控制台输出

//控制台输出如下
//=============================================================================
//	请求报文如下
//	0003721000510110199201209222240000020120922000069347814303000700000813``中国联通交费充值`为号码18655228826交费充值100.00元`UDP1209222238312219411`10000```20120922`chinaunicom-payFeeOnline`UTF-8`20120922223831`MD5`20120922020103806276`1`02`10000`20120922223954`20120922`BOCO_B2C```http://192.168.20.2:5545/ecpay/pay/elecChnlFrontPayRspBackAction.action`1`立即支付,交易成功`
//	=============================================================================
//	响应报文如下
//	00015800000000订单结果通知:商户系统未成功接收到通知,需要继续通知                                               6717356649614827173120130405201628201304051`
//	=============================================================================
//	响应十六进制如下
//
//	------------------------------------------------------------------------
//	0000: 30 30 30 31 35 38 30 30 30 30 30 30 30 30 B6 A9 | 00015800000000订
//	0010: B5 A5 BD E1 B9 FB CD A8 D6 AA 3A C9 CC BB A7 CF | 单结果通知:商户系
//	0020: B5 CD B3 CE B4 B3 C9 B9 A6 BD D3 CA D5 B5 BD CD | ?统未成功接收到通
//	0030: A8 D6 AA 2C D0 E8 D2 AA BC CC D0 F8 CD A8 D6 AA | ?知,需要继续通知
//	0040: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |                 
//	0050: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |                 
//	0060: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |                 
//	0070: 00 00 36 37 31 37 33 35 36 36 34 39 36 31 34 38 |   67173566496148
//	0080: 32 37 31 37 33 31 32 30 31 33 30 34 30 35 32 30 | 2717312013040520
//	0090: 31 36 32 38 32 30 31 33 30 34 30 35 31 60       | 1628201304051`
//	------------------------------------------------------------------------
//	=============================================================================
//