utils.JwtUtil

package com.lin.springboot01.utils;
import com.auth0.jwt.JWT;
import com.auth0.jwt.algorithms.Algorithm;
import java.util.Date;
import java.util.Map;public class JwtUtil {private static final String KEY = "liner2332";//接受业务数据，生成token并返回public static String genToken(Map<String,Object> claims) {return JWT.create().withClaim("claims",claims).withExpiresAt(new Date(System.currentTimeMillis()+1000*60*60*12)).sign(Algorithm.HMAC256(KEY));}//接收token，验证token，并返回业务数据public static Map<String,Object> parseToken(String token){return JWT.require(Algorithm.HMAC256(KEY)).build().verify(token).getClaim("claims").asMap();}
}

utils.MD5Util

package com.lin.springboot01.utils;import java.security.MessageDigest;import lombok.extern.slf4j.Slf4j;@Slf4j
public class MD5Util {/**** MD5加码 生成32位md5码*/public static String string2MD5(String inStr) {MessageDigest md5 = null;try {md5 = MessageDigest.getInstance("MD5");} catch (Exception e) {log.info(e.toString());e.printStackTrace();return "";}char[] charArray = inStr.toCharArray();byte[] byteArray = new byte[charArray.length];for (int i = 0; i < charArray.length; i++)byteArray[i] = (byte) charArray[i];byte[] md5Bytes = md5.digest(byteArray);StringBuffer hexValue = new StringBuffer();for (int i = 0; i < md5Bytes.length; i++) {int val = ((int) md5Bytes[i]) & 0xff;if (val < 16)hexValue.append("0");hexValue.append(Integer.toHexString(val));}return hexValue.toString();}/*** 加密解密算法 执行一次加密，两次解密*/public static String convertMD5(String inStr) {char[] a = inStr.toCharArray();for (int i = 0; i < a.length; i++) {a[i] = (char) (a[i] ^ 't');}String s = new String(a);return s;}/*** 判断输入的密码和数据库中保存的MD5密码是否一致* @param inputPassword 输入的密码* @param md5DB 数据库保存的密码* @return*/public static boolean passwordIsTrue(String inputPassword,String md5DB) {String md5 = string2MD5(inputPassword);return md5DB.equals(md5);}// 测试主函数public static void main(String args[]) {String s = new String("123456");log.info("原始：" + s);log.info("MD5后：" + string2MD5(s));log.info("密码是否一致：" + passwordIsTrue("123456","e10adc3949ba59abbe56e057f20f883e"));}}

utils.ThreadLocalUtil

package com.lin.springboot01.utils;public class ThreadLocalUtil {//提供ThreadLocal对象private static final ThreadLocal THREAD_LOCAL = new ThreadLocal();//根据键获取值public static <T> T get(){return (T) THREAD_LOCAL.get();}//存储键值对public static void set(Object value){THREAD_LOCAL.set(value);}//清除Threadlocal 防止内存泄露public static void remove(){THREAD_LOCAL.remove();}
}

pojo.Result

package com.lin.springboot01.pojo;import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;@NoArgsConstructor
@AllArgsConstructor
@Data
public class Result<T> {private Integer code; //业务状态码 0-成功 1-失败private String message; //提示信息private T data; //相应数据//快速返回操作成功相应结果（带相应数据）public static <E> Result<E> success(E data){return new Result<>(0,"操作成功",data);}public static Result success(){return new Result(0,"操作成功",null);}public static Result error(String message){return new Result(1,message,null);}}

exception.GlobalExceptionHandler（参数校验失败异常处理,全局异常处理器）

package com.lin.springboot01.exception;import com.lin.springboot01.pojo.Result;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
//被 @ExceptionHandler、@InitBinder、@ModelAttribute 注解的方法，都会作用在 被 @RequestMapping 注解的方法上。
@RestControllerAdvice
//参数校验失败异常处理,全局异常处理器
public class GlobalExceptionHandler {@ExceptionHandler(Exception.class)public Result handleExcpetion(Exception e){e.printStackTrace();return Result.error(StringUtils.hasLength(e.getMessage())?e.getMessage():"操作失败");}
}

拦截器：

interceptors.LoginInterceptor（注册拦截器）

package com.lin.springboot01.interceptors;import com.lin.springboot01.utils.JwtUtil;
import com.lin.springboot01.utils.ThreadLocalUtil;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerInterceptor;import java.util.Map;@Component
public class LoginInterceptor implements HandlerInterceptor {@Overridepublic boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {String token = request.getHeader("Authorization");try {//能否解析成功Map<String, Object> claims = JwtUtil.parseToken(token);//把业务数据存储到ThreadLocal中ThreadLocalUtil.set(claims);//放行return true;} catch (Exception e) {//解析失败，httpServletResponse响应码设置为401response.setStatus(401);return false;}}@Overridepublic void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {//清空Threadlocal中的数据ThreadLocalUtil.remove();}
}

config.WebConfig（config中配置拦截器）

package com.lin.springboot01.config;import com.lin.springboot01.interceptors.LoginInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class WebConfig implements WebMvcConfigurer {@Autowiredprivate LoginInterceptor loginInterceptor;@Overridepublic void addInterceptors(InterceptorRegistry registry) {//登录接口和注册接口不拦截registry.addInterceptor(loginInterceptor).excludePathPatterns("/user/login","/user/register");}
}