java微信公众号开发总结(1)——接口认证

参考官方文档：接入指南

要完成接口认证需要将自己的代码部署到公网服务器，服务器的端口为80，微信接口认证目前只支持80端口。

1.新建一个web项目；

2.编写一个Servlet：

public class AuthServlet extends HttpServlet {
private static final Logger log = Logger.getLogger(AuthServlet.class);

@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");

log.debug("signature = " + signature);
log.debug("timestamp = " + timestamp);
log.debug("nonce = " + nonce);
log.debug("echostr = " + signature);

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

}
3.CheckUtil.java
public class CheckUtil {
//token为自己定义的一个字符串
private static final String token= "mytoken";
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 sb = new StringBuffer();
for(int i=0; i<arr.length; i++) {
sb.append(arr[i]);
}

//sha1加密
String tmpStr = getSHA1Str(sb.toString());
//加密字符串与signature比较的时候忽略大小写
return tmpStr.equals(signature.toUpperCase());
}

private static String getSHA1Str(String content) {
MessageDigest md = null;
String tmpStr = null;

try {
md = MessageDigest.getInstance("SHA-1");
// 将三个参数字符串拼接成一个字符串进行 shal 加密
byte[] digest = md.digest(content.toString().getBytes());
tmpStr = byteToStr(digest);
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
return tmpStr;
}

/**
* 将字节数组转换为十六进制字符串
* @param digest
* @return
*/
private static String byteToStr(byte[] digest) {
String strDigest = "";
for(int i = 0; i < digest.length; i++){
strDigest += byteToHexStr(digest[i]);
}
return strDigest;
}

/**
* 将字节转换为十六进制字符串
* @param b
* @return
*/
private static String byteToHexStr(byte b) {
char[] Digit = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
char[] tempArr = new char[2];
tempArr[0] = Digit[(b >>> 4) & 0X0F];
tempArr[1] = Digit[b & 0X0F];

String s = new String(tempArr);
return s;
}
}4.将servlet配置到web.xml
<servlet>
<servlet-name>authServlet</servlet-name>
<servlet-class>AuthServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>authServlet</servlet-name>
<url-pattern>/wx.do</url-pattern>
</servlet-mapping>5.将项目部署到公网，然后将url和token配置到公众平台，能正常接入则表示成功。