微信开发教程（一）：服务器环境搭建

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<%@page import="java.util.Date"%>
<%@page import="org.dom4j.Element"%>
<%@page import="org.dom4j.DocumentHelper"%>
<%@page import="org.dom4j.Document"%>
<%@page import="java.io.IOException"%>
<%@page import="java.io.InputStreamReader"%>
<%@page import="java.io.BufferedReader"%>
<%@page import="java.io.Reader"%>
<%@page import="java.security.MessageDigest"%>
<%@page import="org.springframework.context.ApplicationContext"%>
<%@page import="org.springframework.web.context.support.WebApplicationContextUtils"%>
<%@page import="java.util.Arrays"%>
<%@page import="java.util.*"%>
<%  String path = request.getContextPath();   %>
<%  
    final String TOKEN="weixin";
    final HttpServletRequest final_request=request;
    final HttpServletResponse final_response=response;
    final HttpSession final_session =session;
    final ApplicationContext context = WebApplicationContextUtils.getWebApplicationContext(pageContext.getServletContext());
%>
<% class WeiXinHandler{  
        public void valid(){
            String echostr=final_request.getParameter("echostr");   
            if(null==echostr||echostr.isEmpty()){    
                try{     
                    responseMsg();    
                }catch(Exception ex){     
                    ex.printStackTrace();
                }
            }else{
                if(this.checkSignature()){
                    this.print(echostr);
                }else{
                    this.print("error"); 
                }
            }
        }
        //自动回复内容  
        public void responseMsg()throws Exception{
            String postStr=null;
            postStr=this.readStreamParameter(final_request.getInputStream());
            System.out.println("22:"+postStr);
            if (null!=postStr&&!postStr.isEmpty()){
                Document document=null;
                try{
                    document = DocumentHelper.parseText(postStr);
                }catch(Exception e){
                    e.printStackTrace();
                }
                if(null==document){
                    this.print("");
                    return;
                }
                Element root=document.getRootElement();
                String fromUsername = root.elementText("FromUserName");
                String toUsername = root.elementText("ToUserName");
                String keyword = root.elementTextTrim("Content"); //消息内容
                String msgtype =root.elementTextTrim("MsgType"); //消息类型
                String event =root.elementTextTrim("Event"); //事件推送  click 表示自定义菜单点击事件
                String eventKey =root.elementTextTrim("EventKey"); //自定义菜单接口中KEY值对应
                String location_x =root.elementTextTrim("Location_X"); //地理位置纬度 
                String location_y =root.elementTextTrim("Location_Y"); //地理位置经度
                String scale = root.elementTextTrim("Scale");//地图缩放大小
                String label = root.elementTextTrim("Label");//地理位置信息
                String time = new Date().getTime()+"";
                System.out.println("keyword: "+keyword);
                System.out.println("msgtype: "+msgtype); 
                //文本消息
                String textTpl ="<xml>"+       "<ToUserName><![CDATA[%1$s]]></ToUserName>"+       "<FromUserName><![CDATA[%2$s]]></FromUserName>"+       "<CreateTime>%3$s</CreateTime>"+       "<MsgType><![CDATA[%4$s]]></MsgType>"+       "<Content><![CDATA[%5$s]]></Content>"+       "<FuncFlag>0</FuncFlag>"+       "</xml>";
                //图文消息     
                String textTpl2 ="<xml>"+      "<ToUserName><![CDATA["+fromUsername+"]]></ToUserName>"+      "<FromUserName><![CDATA["+toUsername+"]]></FromUserName>"+      "<CreateTime>"+new Date().getTime()+"</CreateTime>"+      "<MsgType><![CDATA[news]]></MsgType>"+      "<Content><![CDATA[]]></Content>"+      "<ArticleCount>2</ArticleCount>"+      "<Articles>"+      "<item>"+      "<Title><![CDATA[%1$s]]></Title>"+      "<Description><![CDATA[]]></Description>"+      "<PicUrl><![CDATA[%2$s]]></PicUrl>"+      "<Url><![CDATA[%3$s]]></Url>"+      "</item>"+      "<item>"+      "<Title><![CDATA[%4$s]]></Title>"+      "<Description><![CDATA[]]></Description>"+      "<PicUrl><![CDATA[]]></PicUrl>"+      "<Url><![CDATA[%5$s]]></Url>"+      "</item>"+      "</Articles>"+      "<FuncFlag>0</FuncFlag>"+      "</xml>";
            }
        }
        
        //微信接口验证
        public boolean checkSignature(){
            String signature = final_request.getParameter("signature");
            String timestamp = final_request.getParameter("timestamp");
            String nonce = final_request.getParameter("nonce");
            String token=TOKEN;
            String[] tmpArr={token,timestamp,nonce};
            Arrays.sort(tmpArr);
            String tmpStr=this.ArrayToString(tmpArr);
            tmpStr=this.SHA1Encode(tmpStr);
            if(tmpStr.equalsIgnoreCase(signature)){
                return true;
            }else{
                return false;
            }
        }
        
        //向请求端发送返回数据
        public void print(String content){
            try{
                final_response.getWriter().print(content);
                final_response.getWriter().flush();
                final_response.getWriter().close();
            }catch(Exception e){
                
            }
        }
        
        //数组转字符串  
        public String ArrayToString(String [] arr){
            StringBuffer bf = new StringBuffer();
            for(int i = 0; i < arr.length; i++){
                bf.append(arr[i]);
            }
            return bf.toString();
        }
        
        //sha1加密  
        public String SHA1Encode(String sourceString) {
            String resultString = null;
            try {
                resultString = new String(sourceString);
                MessageDigest md = MessageDigest.getInstance("SHA-1");
                resultString = byte2hexString(md.digest(resultString.getBytes()));
            } catch (Exception ex) {
                
            }
            return resultString;
        }
        
        public final String byte2hexString(byte[] bytes) {
            StringBuffer buf = new StringBuffer(bytes.length * 2);
            for (int i = 0; i < bytes.length; i++) {
                if (((int) bytes[i] & 0xff) < 0x10) {
                    buf.append("0");
                }
                buf.append(Long.toString((int) bytes[i] & 0xff, 16));
            }
            return buf.toString().toUpperCase();
        }
        
        //从输入流读取post参数
        public String readStreamParameter(ServletInputStream in){
            StringBuilder buffer = new StringBuilder();
            BufferedReader reader=null;
            try{
                reader = new BufferedReader(new InputStreamReader(in));
                String line=null;
                while((line = reader.readLine())!=null){
                    buffer.append(line);
                }
            }catch(Exception e){
                e.printStackTrace();
            }finally{
                if(null!=reader){
                    try {
                        reader.close();
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                }
            }
            return buffer.toString();
        }
    } %>

<%  WeiXinHandler handler=new WeiXinHandler();
    handler.valid();
%>