从零开发微信公众号系列 【二】开发者基本配置和接入指南

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登录微信公众平台后台管理界面，左侧菜单开发->基本配置。

填写URL(服务器地址)、Token(令牌)、EncodingAESKey(消息加解***)、明文加密。

填写完以上信息，验证时微信会发送一个get请求到填写的URL，开发者需要接收该请求并校验是否来自微信，如果是来自微信，返回请求中echostr参数内容（不校验直接返回也可以通过，校验是为了确保请求来自微信，而不是其它途径）。

WechatController.java

package com.blacklist.cotroller;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.Scope;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import com.blacklist.server.WechatService;

@RestController
@SpringBootApplication
@RequestMapping("/wechat")
@Scope("prototype")
public class WechatController {
	@Autowired
	private WechatService wechatService;

	@RequestMapping(method = { RequestMethod.POST, RequestMethod.GET }, produces = "text/html;charset=UTF-8")
	@ResponseBody
	public void index(HttpServletRequest request, HttpServletResponse response)
			throws IOException {
		request.setCharacterEncoding("UTF-8");
		response.setCharacterEncoding("UTF-8");
		boolean isGet = request.getMethod().toLowerCase().equals("get");
		if (isGet) {
			String signature = request.getParameter("signature");
			String timestamp = request.getParameter("timestamp");
			String nonce = request.getParameter("nonce");
			String echostr = request.getParameter("echostr");
			if (wechatService.validate(signature, timestamp, nonce)) {
				response.getWriter().write(echostr);
			}
		}
	}
}

WechatService.java

package com.blacklist.server;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Service;

import com.blacklist.config.WechatConfig;
import com.blacklist.utils.SHA1;

@Service
public class WechatService {
	private static Logger log = LoggerFactory.getLogger(WechatService.class);

	public boolean validate(String signature, String timestamp, String nonce) {
		List<String> list = new ArrayList<String>();
		list.add(timestamp);
		list.add(nonce);
		list.add(WechatConfig.token);
		Collections.sort(list);
		String temp = String.join("", list);
		if (signature.equals(SHA1.str2SHA1(temp))) {
			return true;
		}
		return false;
	}
}

SHA1.java

package com.blacklist.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class SHA1 {
	/**
	 * SHA1加密
	 * */
	public static String str2SHA1(String str) {
		try {
			MessageDigest digest = MessageDigest.getInstance("SHA-1");
			digest.update(str.getBytes());
			byte[] msgDigest = digest.digest();
			StringBuffer sb = new StringBuffer();
			for (int i = 0; i < msgDigest.length; i++) {
				String shaHex = Integer.toHexString(msgDigest[i] & 0xFF);
				if (shaHex.length() < 2) {
					sb.append(0);
				}
				sb.append(shaHex);
			}
			return sb.toString();
		} catch (NoSuchAlgorithmException e) {
			e.printStackTrace();
		}
		return "";
	}
}

验证，至此，接入完成。

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