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配置好eclipse
新建一个Java web项目
新建 WeixinServlet
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继承 HttpServlet,如果继承不了,需要到tomcat的lib包下面,拷贝如下两个包到项目的lib下面
如图,创建好了WeixinServlet
输入 dog 可以快捷出doGet方法。
目录结构
/Weixin/src/com/imooc/servlet/WeixinServlet.java
package com.imooc.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.imooc.util.CheckUtil;
public class WeixinServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String signature = req.getParameter("signature");
String timestamp = req.getParameter("timestamp");
String nonce = req.getParameter("nonce");
String echostr = req.getParameter("echostr"); //随机字符串
PrintWriter out = resp.getWriter();
if(CheckUtil.checkSignature(signature, timestamp, nonce)){
out.print(echostr);
}
}
}
/Weixin/src/com/imooc/util/CheckUtil.java
package com.imooc.util;
import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
public class CheckUtil {
private static final String token = "imooc";
public static boolean checkSignature(String signature,String timestamp,String nonce){
String[] arr = new String[]{token,timestamp,nonce};
//排序
Arrays.sort(arr);
//生成字符串
StringBuffer content = new StringBuffer();
for(int i=0;i < arr.length; i++){
content.append(arr[i]);
}
// sha1加密
String temp = getSha1(content.toString());
return temp.equals(signature);
}
public static String getSha1(String str){
if(str == null || str.length() == 0){
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;
}
}
}
/Weixin/WebContent/WEB-INF/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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
<display-name>Weixin</display-name>
<servlet>
<servlet-name>weixinServlet</servlet-name>
<servlet-class>com.imooc.servlet.WeixinServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>weixinServlet</servlet-name>
<url-pattern>/wx.do</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>