<!-- JWT依賴 -->
		<dependency>
			<groupId>io.jsonwebtoken</groupId>
			<artifactId>jjwt</artifactId>
			<version>0.7.0</version>
		</dependency>
		<dependency>
			<groupId>com.auth0</groupId>
			<artifactId>java-jwt</artifactId>
			<version>3.4.0</version>
		</dependency>

server:
  port: 8080
spring:
  application:
    name: springboot-jwt

# 自定義配置
config:
  jwt:
    # 加密密鑰
    secret: abcdefg1234567
    # token有效時(shí)長(zhǎng)
    expire: 3600
     # header 名稱
    header: token

package com.ftx.jwt.config;

/**
 * @author FanJiangFeng
 * @version 1.0.0
 * @ClassName JwtConfig.java
 * @Description TODO
 * @createTime 2020年06月22日 15:43:00
 */

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * JWT的token，區(qū)分大小寫
 */
@ConfigurationProperties(prefix = "config.jwt", ignoreUnknownFields = true)
@Component
public class JwtConfig {

    private String secret;
    private long expire;
    private String header;

    /**
     * 生成token
     * @param subject
     * @return
     */
    public String createToken (String subject){
        Date nowDate = new Date();
        Date expireDate = new Date(nowDate.getTime() + expire * 1000);//過(guò)期時(shí)間

        return Jwts.builder()
                .setHeaderParam("typ", "JWT")
                .setSubject(subject)
                .setIssuedAt(nowDate)
                .setExpiration(expireDate)
                .signWith(SignatureAlgorithm.HS512, secret)
                .compact();
    }
    /**
     * 獲取token中注冊(cè)信息
     * @param token
     * @return
     */
    public Claims getTokenClaim (String token) {
        try {
            return Jwts.parser().setSigningKey(secret).parseClaimsJws(token).getBody();
        }catch (Exception e){
//            e.printStackTrace();
            return null;
        }
    }
    /**
     * 驗(yàn)證token是否過(guò)期失效
     * @param expirationTime
     * @return
     */
    public boolean isTokenExpired (Date expirationTime) {
        return expirationTime.before(new Date());
    }

    /**
     * 獲取token失效時(shí)間
     * @param token
     * @return
     */
    public Date getExpirationDateFromToken(String token) {
        return getTokenClaim(token).getExpiration();
    }
    /**
     * 獲取用戶名從token中
     */
    public String getUsernameFromToken(String token) {
        return getTokenClaim(token).getSubject();
    }

    /**
     * 獲取jwt發(fā)布時(shí)間
     */
    public Date getIssuedAtDateFromToken(String token) {
        return getTokenClaim(token).getIssuedAt();
    }

    // --------------------- getter & setter ---------------------

    public String getSecret() {
        return secret;
    }
    public void setSecret(String secret) {
        this.secret = secret;
    }
    public long getExpire() {
        return expire;
    }
    public void setExpire(long expire) {
        this.expire = expire;
    }
    public String getHeader() {
        return header;
    }
    public void setHeader(String header) {
        this.header = header;
    }
}

package com.ftx.jwt.config;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.SignatureException;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * @author FanJiangFeng
 * @version 1.0.0
 * @ClassName TokenInterceptor.java
 * @Description TODO
 * @createTime 2020年06月22日 15:47:00
 */
@Component
public class TokenInterceptor extends HandlerInterceptorAdapter {

    @Resource
    private JwtConfig jwtConfig ;
    @Override
    public boolean preHandle(HttpServletRequest request,
                             HttpServletResponse response,
                             Object handler) throws SignatureException {
        /** 地址過(guò)濾 */
        String uri = request.getRequestURI() ;
        if (uri.contains("/login")){
            return true ;
        }
        /** Token 驗(yàn)證 */
        String token = request.getHeader(jwtConfig.getHeader());
        if(StringUtils.isEmpty(token)){
            token = request.getParameter(jwtConfig.getHeader());
        }
        if(StringUtils.isEmpty(token)){
            throw new SignatureException(jwtConfig.getHeader()+ "不能為空");
        }

        Claims claims = null;
        try{
            claims = jwtConfig.getTokenClaim(token);
            if(claims == null || jwtConfig.isTokenExpired(claims.getExpiration())){
                throw new SignatureException(jwtConfig.getHeader() + "失效，請(qǐng)重新登錄。");
            }
        }catch (Exception e){
            throw new SignatureException(jwtConfig.getHeader() + "失效，請(qǐng)重新登錄。");
        }
		//該token可用，放行
        return true;
    }
}

package com.ftx.jwt.config;

/**
 * @author FanJiangFeng
 * @version 1.0.0
 * @ClassName WebConfig.java
 * @Description TODO
 * @createTime 2020年06月22日 15:53:00
 */

import org.springframework.context.annotation.Configuration;
import org.springframework.format.FormatterRegistry;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.validation.MessageCodesResolver;
import org.springframework.validation.Validator;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.HandlerMethodReturnValueHandler;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.config.annotation.*;
import javax.annotation.Resource;
import java.util.List;

@Configuration
public class WebConfig implements WebMvcConfigurer {
    @Resource
    private TokenInterceptor tokenInterceptor ;
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(tokenInterceptor).addPathPatterns("/**");
    }
}

package com.ftx.jwt.controller;
import com.alibaba.fastjson.JSONObject;
import com.ftx.jwt.config.JwtConfig;
import com.ftx.jwt.util.ResultTool;
import org.springframework.util.StringUtils;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
import javax.servlet.http.HttpServletRequest;

/**
 * @author FanJiangFeng
 * @version 1.0.0
 * @ClassName TokenController.java
 * @Description TODO
 * @createTime 2020年06月22日 16:05:00
 */
@RestController
public class TokenController {
    @Resource
    private JwtConfig jwtConfig ;

    /**
     * 用戶登錄接口
     * @param userName
     * @param passWord
     * @return
     */
    @PostMapping("/login")
    public JSONObject login (@RequestParam("userName") String userName,
                              @RequestParam("passWord") String passWord){
        JSONObject json = new JSONObject();

        /** 驗(yàn)證userName，passWord和數(shù)據(jù)庫(kù)中是否一致，如不一致，直接return ResultTool.errer(); 【這里省略該步驟】*/

        // 這里模擬通過(guò)用戶名和密碼，從數(shù)據(jù)庫(kù)查詢userId
        // 這里把userId轉(zhuǎn)為String類型，實(shí)際開(kāi)發(fā)中如果subject需要存userId，則可以JwtConfig的createToken方法的參數(shù)設(shè)置為L(zhǎng)ong類型
        String userId = 5 + "";
        String token = jwtConfig.createToken(userId) ;
        if (!StringUtils.isEmpty(token)) {
            json.put("token",token) ;
        }
        return ResultTool.success(json) ;
    }

    /**
     * 需要 Token 驗(yàn)證的接口
     */
    @PostMapping("/info")
    public JSONObject info (){
        return ResultTool.success("info") ;
    }

    /**
     * 根據(jù)請(qǐng)求頭的token獲取userId
     * @param request
     * @return
     */
    @GetMapping("/getUserInfo")
    public JSONObject getUserInfo(HttpServletRequest request){
        String usernameFromToken = jwtConfig.getUsernameFromToken(request.getHeader("token"));
        return ResultTool.success(usernameFromToken) ;
    }
}