<!--        JWT令牌-->
        <dependency>
            <groupId>io.jsonwebtoken</groupId>
            <artifactId>jjwt</artifactId>
            <version>0.9.1</version>
        </dependency>

 //生成jwt
    @Test
    public void testGenJwt(){
        Map<String, Object> claims = new HashMap<>();
        claims.put("id",1);
        claims.put("name","Tom");

        String jwt = Jwts.builder()
                .signWith(SignatureAlgorithm.HS512, "itheima")  //簽名算法
                .setClaims(claims)   //自定義內(nèi)容
                                //有參構(gòu)造方法
                .setExpiration(new Date(System.currentTimeMillis()+3600))  //令牌過期時(shí)間
               .compact();
        System.out.println(jwt);

    }

   //解析jwt
    @Test
    public void testParseJwt() {
        Claims claims=Jwts.parser()
                .setSigningKey("itheima")
                //寫入你剛才運(yùn)行出來的jwt令牌
                .parseClaimsJws("eyJhbGciOiJIUzUxMiJ9.eyJuYW1lIjoiVG9tIiwiaWQiOjEsImV4cCI6MTcwMDcyMzQ1M30.GMp1Z-osnaOJ08nM3uswPKRFIaKS4e6_UvZXq2Q4QjYBFRcJNk7WgQRkFJHXIUrZfKovXUZhd8-OOKtXYDyrbg")
                .getBody();
        System.out.println(claims);
    }

package com.itheima.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;

import java.util.Date;
import java.util.Map;

public class JwtUtils {

    private static String signKey = "itheima";	//簽名密鑰
    private static Long expire = 43200000L;		//過期時(shí)間

    /**
     * 生成JWT令牌
     * @param claims JWT第二部分負(fù)載 payload 中存儲(chǔ)的內(nèi)容
     * @return
     */
    public static String generateJwt(Map<String, Object> claims){
        String jwt = Jwts.builder()
                .addClaims(claims)
                .signWith(SignatureAlgorithm.HS256, signKey)
                .setExpiration(new Date(System.currentTimeMillis() + expire))
                .compact();
        return jwt;
    }

    /**
     * 解析JWT令牌
     * @param jwt JWT令牌
     * @return JWT第二部分負(fù)載 payload 中存儲(chǔ)的內(nèi)容
     */
    public static Claims parseJWT(String jwt){
        Claims claims = Jwts.parser()
                .setSigningKey(signKey)
                .parseClaimsJws(jwt)
                .getBody();
        return claims;
    }
}

package com.itheima.controller;

import com.itheima.pojo.Emp;
import com.itheima.pojo.Result;
import com.itheima.service.EmpService;
import com.itheima.utils.JwtUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import java.util.HashMap;
import java.util.Map;

@Slf4j
@RestController
public class LoginController {

    @Autowired
    private EmpService empService;

    @PostMapping("/login")
    public Result login(@RequestBody Emp emp){
        log.info("員工登錄: {}", emp);
        Emp e = empService.login(emp);

        //登錄成功,生成令牌,下發(fā)令牌
        if (e != null){
            Map<String, Object> claims = new HashMap<>();
            claims.put("id", e.getId());
            claims.put("name", e.getName());
            claims.put("username", e.getUsername());

            String jwt = JwtUtils.generateJwt(claims); //jwt包含了當(dāng)前登錄的員工信息
            return Result.success(jwt);
        }

        //登錄失敗, 返回錯(cuò)誤信息
        return Result.error("用戶名或密碼錯(cuò)誤");
    }

}