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commonutil是一个功能丰富的Java工具类库，通过封装静态方法，降低学习成本，提升工作效率。
package com.gitee.yongzhuzl.commonutil.util.wx.pay;
import com.gitee.yongzhuzl.commonutil.util.empty.EmptyUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.security.MessageDigest;
import java.util.Map;
import java.util.Set;
import java.util.SortedMap;
/**
* description: 微信签名工具类
* @author 朱正磊
* @date 2019-12-05 18:02:30
*/
@SuppressWarnings("ALL")
public class WxSignUtil {
private static final Logger log = LoggerFactory.getLogger(WxSignUtil.class);
/**
* description: 生成微信签名
* @author 朱正磊
* @date 2019-12-05 18:11:32
* @param encode 字符编码
* @param params 参数（字母序）
* @param apiKey 密钥key
* @return 返回签名
*/
public static String sign(String encode, SortedMap params, String apiKey) {
log.info("待签名参数：{}", params);
StringBuilder stringBuilder = new StringBuilder();
Set> entries = params.entrySet();
for (Map.Entry entry : entries) {
String k = entry.getKey();
Object v = entry.getValue();
if (null != v && !"".equals(v) && !"sign".equals(k) && !"key".equals(k)) {
stringBuilder.append(k).append("=").append(v).append("&");
}
}
stringBuilder.append("key=").append(apiKey);
String sign = md5(stringBuilder.toString(), encode).toUpperCase();
log.info("生成微信签名：{}", sign);
return sign;
}
/**
* description: 校验签名，规则是按参数名称a-z排序，遇到空值的参数不参加签名
* @author 朱正磊
* @date 2019-12-05 19:11:13
* @param encode 字符编码
* @param params 参数（字母序）
* @param apiKey 密钥key
* @return 校验通过返回true，否则返回false
*/
public static Boolean validateSign(String encode, SortedMap params, String apiKey) {
log.info("待签名参数：{}", params);
StringBuilder stringBuilder = new StringBuilder();
Set> entries = params.entrySet();
for (Map.Entry entry : entries) {
String k = entry.getKey();
Object v = entry.getValue();
if (!"sign".equals(k) && null != v && !"".equals(v)) {
stringBuilder.append(k).append("=").append(v).append("&");
}
}
stringBuilder.append("key=").append(apiKey);
String mySign = md5(stringBuilder.toString(), encode).toUpperCase();
log.info("自己生成签名结果：{}", mySign);
String wxSign = params.get("sign").toString();
log.info("微信生成签名结果：{}", wxSign);
return wxSign.equals(mySign);
}
/**
* description: 对字符串进行MD5签名
* @author 朱正磊
* @date 2019-12-05 18:21:37
* @param origin 待MD5签名的字符串
* @param charset 字符编码方式
* @return 返回MD5签名后的字符串
*/
public static String md5(String origin, String charset) {
log.info("待MD5签名的字符串：{}", origin);
String result = null;
try {
MessageDigest md = MessageDigest.getInstance("MD5");
if (EmptyUtil.isEmpty(charset)) {
result = byteArrayToHexString(md.digest(origin.getBytes()));
} else {
result = byteArrayToHexString(md.digest(origin.getBytes(charset)));
}
} catch (Exception e) {
e.printStackTrace();
}
log.info("MD5签名结果：{}", result);
return result;
}
/**
* description: 将字节数组转换成16进制表示的字符串
* @author 朱正磊
* @date 2019-12-05 18:20:19
* @param bytes 字节数组
* @return 返回16进制表示的字符串
*/
private static String byteArrayToHexString(byte[] bytes) {
StringBuilder stringBuilder = new StringBuilder();
for (byte b : bytes) {
stringBuilder.append(byteToHexString(b));
}
return stringBuilder.toString();
}
/**
* description: 将字节转换成16进制表示的字符串
* @author 朱正磊
* @date 2019-12-05 18:17:49
* @param b 字节
* @return 返回16进制表示的字符串
*/
private static String byteToHexString(byte b) {
int n = b;
if (n < 0) {
n += 256;
}
int d1 = n / 16;
int d2 = n % 16;
return HEX_DIGITS[d1] + HEX_DIGITS[d2];
}
/**
* 默认的密码字符串组合，用来将字节转换成16进制表示的字符，apache校验下载的文件的正确性用的就是默认的这个组合
*/
private static final String[] HEX_DIGITS = {"0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"};
}