微信公众号开发之测试号接口接入指南

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获取参数进行分析，将token、timestamp、nonce三个参数进行字典序排序然后将三个参数字符串拼接成一个字符串进行sha1加密 ，开发者获得加密后的字符串可与signature对比，相同就返回echostr随机字符串。

package Server;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import Tools.CheckUtil;

/**
 * Servlet implementation class Text
 */
@WebServlet("/Text")
public class Text extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public Text() {
        super();
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		String signature = request.getParameter("signature");
		String timestamp = request.getParameter("timestamp");
		String nonce = request.getParameter("nonce");
		String echostr = request.getParameter("echostr");
		
		PrintWriter out = response.getWriter();
		
		if(CheckUtil.checkSignature(signature, timestamp, nonce)){
			out.print(echostr);
		}
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		
		doGet(request, response);
	}

}

检查字符串的类

package Tools;

import java.security.MessageDigest;
import java.util.Arrays;

public class CheckUtil {

	private static final String token = "hometao";
	public static boolean checkSignature(String signature,String timestamp,String nonce){
		String[] arr = new String[]{token,timestamp,nonce};
		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;
		}
	}
}

点击提交，测试成功！！ 注意token值和代码中的token值一定要相同。