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  示例使用的读卡器：RFID网络WIFI无线TCP/UDP/HTTP可编程二次开发读卡器POE供电语音-淘宝网 (taobao.com)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.ServerSocket;
import java.net.Socket;
import java.text.SimpleDateFormat;
import java.util.Date;public class httpserver {public static void main(String[] args) throws Exception{int listenport=80;                                         /*监听端口号*/if (args[0]!=null){listenport=Integer.parseInt(args[0]);}  //侦听自定义的端口try {ServerSocket ss = new ServerSocket(listenport);while (true) {String condition="";String ResponseStr="";Socket socket = ss.accept();                /*实例化客户端，固定套路，通过服务端接受的对象，生成相应的客户端实例*/BufferedReader bd = new BufferedReader(new InputStreamReader(socket.getInputStream()));     /*获取客户端输入流，就是请求过来的基本信息：请求头，换行符，请求体*/String requestHeader;int contentLength = 0;while ((requestHeader = bd.readLine()) != null && !requestHeader.isEmpty()) {   /*** 接受HTTP请求，并解析数据 */System.out.println(requestHeader);/*** 获得GET参数*/if (requestHeader.startsWith("GET")) {int begin = requestHeader.indexOf("?") + 1;int end = requestHeader.indexOf("HTTP/");condition = requestHeader.substring(begin, end);ResponseStr=AnalyticHttpInfo(condition);}else {/*** 获得POST参数* 1.获取请求内容长度*/if (requestHeader.startsWith("Content-Length")) {int begin = requestHeader.indexOf("Content-Lengh:") + "Content-Length:".length();String postParamterLength = requestHeader.substring(begin + 1).trim();contentLength = Integer.parseInt(postParamterLength);}}}StringBuffer sb = new StringBuffer();if (contentLength > 0) {for (int i = 0; i < contentLength; i++) {sb.append((char) bd.read());}System.out.println("POST parameter: " + sb.toString());condition=sb.toString().replace("\r\n","");condition=condition.replace("{","");        //可以引用JSON的Jar包来解析json数据，这里将它转一般字符串来处理condition=condition.replace("}","");condition=condition.replace(",","&");condition=condition.replace(":","=");condition=condition.replace("\"","");ResponseStr=AnalyticHttpInfo(condition);      //解析读卡器上传的包序号、卡号、机号等信息，并生成回应字符串}/*发送回应信息*/PrintWriter pw = new PrintWriter(socket.getOutputStream());pw.println(ResponseStr);pw.flush();System.out.println("Response: "+ResponseStr+"\r\n");}} catch (IOException e) {e.printStackTrace();}}/*-解析读卡器上传的包序号、机号、卡类型、卡号、卡内数据、设备序列号、读卡状态 等信息，并生成回应字符串------------------------------*/static String AnalyticHttpInfo(String inputstr) throws Exception{String info="";String jihao="";String cardtype="";String card="";String data="";String dn="";String status="";String[] strArr = inputstr.split("&");for (int i=0;i<strArr.length;i++){String[] strPara= strArr[i].split("=");switch(strPara[0]){case "info":info=strPara[1];        //接收到的数据包号，回应时要带入该包号才能正确回应break;case "jihao":jihao=strPara[1];       //设备机号(可自编)break;case "cardtype":cardtype=strPara[1];    //卡类型，1为ID卡，2为HID卡，3为T5557卡，4为EM4305卡，5为IC卡，6为二代证，7为15693卡，8为hid iclass卡break;case "card":card=strPara[1];        //接收到的原始16进制卡号，可根据需要自行转换成其他卡号break;case "data":data=strPara[1];        //读取卡片扇区内容break;case "dn":dn=strPara[1];          //设备硬件序列号，出厂时已固化，全球唯一break;case "status":status=strPara[1];      //读卡状态，如密码认证失败为12break;}}//Response=1 是指定的回应头信息+接收到的包序号+发送到读卡器的显示文字，注意中文一定要转换编码,{}的文字可以着重显示+显示延时秒数+蜂鸣响声代码+固定组合语音代码return "Response=1,"+info+",{"+GetChineseCode("卡号")+":}"+(card+"         ").substring(0,12)+GetSysDT()+",20,2,0";}/*取电脑系统日期时间-------------------------------------------------------------------------------------------------*/static String GetSysDT() {Date date=new Date();SimpleDateFormat formatter=new SimpleDateFormat("yy-MM-dd HH:mm:ss");String TimeStr=formatter.format(date);return TimeStr;}/*获取中文编码信息----------------------------------------------------------------------------------------------*/static String GetChineseCode(String inputstr) throws Exception{byte[] Chinesecodearry = inputstr.getBytes("gb2312");int codelen=Chinesecodearry.length;String hexcode="";for (int i=0;i<codelen;i++) {if (i % 2 == 0) {hexcode=hexcode+"\\x";}String bytestr="00"+Integer.toHexString(Chinesecodearry[i] & 0xff);hexcode=hexcode+ bytestr.substring(bytestr.length() -2,bytestr.length());}return hexcode;}
}