Java 微信公众号开发

微信公众号开发（开发模式-Java）

环境搭建

• 微信公众号申请步骤
  https://kf.qq.com/faq/120911VrYVrA151009eIrYvy.html
• 微信公众号与后台调通
  java后台搭建
  1.创建Dynamic Web Project
  2.创建类WechatServlet继承HttpServlet

//主要重写doGet方法

   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");
   	PrintWriter out = resp.getWriter();
   	if (CheckUtil.checkSignature(signature, timestamp, nonce)) {
   		out.print(echostr);
   	}
   }

//工具类CheckUtil
//定义TOKEN 此处命名随意（后续会用到，一致即可）
private static final String TOKEN = "miya";
	
	public static Boolean checkSignature(String signature, String timestamp, String nonce) {
		String array[] = new String[] {TOKEN, timestamp, nonce };
		//排序
		Arrays.sort(array);
		//生成字符串
		StringBuffer content = new StringBuffer();
		for (int i=0;i<array.length;i++) {
			content.append(array[i]);
		}
		//sha1加密
		String tempStr = getSha1(content.toString());
		
		//返回比较结果
		return tempStr.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;
        }
    }

web.xml 配置
<?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" metadata-complete="false" version="3.0">
  <display-name>
     wechat
  </display-name>
  
  <servlet>
    <servlet-name>wechatServlet</servlet-name>
    <servlet-class>com.miya.wechat.base.WechatServlet</servlet-class>
  </servlet>

  <servlet-mapping>
    <servlet-name>wechatServlet</servlet-name>
    <url-pattern>/wechat.do</url-pattern> 
    /* 名称随意，后续一致即可*/
  </servlet-mapping>
</web-app>

项目结构：
uploading-image-431716.png

现在即可运行项目。

• 配置微信公众平台开发模式配置
  服务器地址：
  若本地测试则 ip+端口号+项目名称+url
  url的配置实在web.xml里面的（名称可随意）
  uploading-image-950650.png

• 下载内网穿刺工具
  有很多，我用的是ngork
  同样访问成功