微信公众平台开发（1）-接入指南

import java.io.IOException;
import java.util.Arrays;
 
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.commons.lang.StringUtils;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
 
import com.company.project.util.Util;
 
import javacommon.base.BaseRestSpringController;
 
@Controller
@RequestMapping("/wxapi")
public class WeixinApiController extends BaseRestSpringController<Object, java.lang.Long>{
public static final Logger log = Logger.getLogger(WeixinApiController.class);
public static final String WX_TOKEN = "weixin";
/**
 * 微信回调地址
 *
 * @author qincd
 * @throws IOException 
 * @date Nov 3, 2014 4:01:42 PM
 */
@RequestMapping(method=RequestMethod.GET)
public void doGet(HttpServletRequest request,HttpServletResponse response) throws IOException {
// 微信会在配置的回调地址上加上signature,nonce,timestamp,echostr4个参数
String signature = request.getParameter("signature");
String timestamp = request.getParameter("timestamp");
String nonce = request.getParameter("nonce");
String echostr = request.getParameter("echostr");
log.info("微信传递的参数：");
log.info("signature："+signature);
log.info("timestamp："+timestamp);
log.info("nonce："+nonce);
log.info("echostr："+echostr);
// 1).排序
String sortString = sort(WX_TOKEN, timestamp, nonce);
// 2).加密
String mytoken = Util.sha1(sortString);
// 3).校验签名
if (StringUtils.isNotEmpty(mytoken) && mytoken.equals(signature)) {
log.info("签名校验通过。");
response.getWriter().println(echostr);
}
else {
log.warn("签名校验失败。");
}
}
/**
 * 将token,timestamp,nonce按字典序排序，并返回拼接的字符串
 *
 * @author qincd
 * @date Nov 3, 2014 4:09:43 PM
 */
public static String sort(String token,String timestamp,String nonce) {
String[] strArray = {token,timestamp,nonce};
Arrays.sort(strArray);
StringBuilder sbuilder = new StringBuilder();
for (String str : strArray) {
sbuilder.append(str);
}
return sbuilder.toString();
}
}
 
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
 
import org.apache.log4j.Logger;
 
public class Util {
private static Logger log = Logger.getLogger(Util.class);
 
/**
 * sha1加密
 *
 * @author qincd
 * @date Nov 3, 2014 4:16:39 PM
 */
public static String sha1(String str) {
if (str == null || str.length() == 0) return "";
try {
MessageDigest md = MessageDigest.getInstance("SHA1");
byte[] bytes = md.digest(str.getBytes());
return byte2Hex(bytes);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
log.error("SHA1加密出错：" + e.getMessage());
throw new RuntimeException("SHA1加密出错");
}
}
public static String byte2Hex(byte[] data) {
if (data == null || data.length == 0) return "";
StringBuilder sbu = new StringBuilder();
for (int i=0;i<data.length;i++) {
if ((data[i] & 0xff) < 0x10) {
sbu.append("0");
}
sbu.append(Integer.toHexString(data[i] & 0xff));
}
return sbu.toString();
}
}