java对接微信开发模式的代码

package com.lee.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.lee.util.CheckUtils;
public class WeixinServlet extends HttpServlet{

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
    String signature =req.getParameter("signature");
    String timestamp =req.getParameter("timestamp");
    String nonce =req.getParameter("nonce");
    String echostr=req.getParameter("echostr");
    PrintWriter out = resp.getWriter();
        out.println(echostr);
    }
    
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // TODO Auto-generated method stub
        super.doPost(req, resp);
    }

    
}

/**

类似php的代码接入

/*

package com.lee.util;
import java.lang.reflect.Array;
import java.security.MessageDigest;
import java.util.Arrays;

public class CheckUtils {

    public static final String token = "E_40257";
    public static boolean checkSignature(String signature,String timestamp,String nonce)
    {
        StringBuffer buffer = new StringBuffer();
        String[] arr = new String[]{token,timestamp,nonce};
        Arrays.sort(arr);
        for(int i=0;i<arr.length;i++)
        {
           buffer.append(arr[i]);
        }
        String temp=getSha1(buffer.toString());
        return temp.equals(signature);
    }
    
    public static String getSha1(String str){
           if (null == str || 0 == str.length()){
               return null;
           }
           char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
                   'a', 'b', 'c', 'd', 'e', 'f'};
           try {
               MessageDigest mdTemp = MessageDigest.getInstance("SHA1");
               mdTemp.update(str.getBytes("UTF-8"));
               byte[] md = mdTemp.digest();
               int j = md.length;
               char[] buf = new char[j * 2];
               int k = 0;
               for (int i = 0; i < j; i++) {
                   byte byte0 = md[i];
                   buf[k++] = hexDigits[byte0 >>> 4 & 0xf];
                   buf[k++] = hexDigits[byte0 & 0xf];
               }
               return new String(buf);
           } catch (Exception e) {
               return null;
           }
        }
    
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>weixin</display-name>
  <servlet>
  <servlet-name>weixin</servlet-name>
  <servlet-class>com.lee.servlet.WeixinServlet</servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name>weixin</servlet-name>
  <url-pattern>/wx.do</url-pattern>
  </servlet-mapping>
</web-app>