Json web token

  1. 导入jjwt依赖
 <dependency>            <groupId>io.jsonwebtoken</groupId>            <artifactId>jjwt</artifactId>            <version>0.9.0</version>        </dependency>
  1. 生成token，使用工具类Jwts的builder()方法，完成用户验证后返回token给客户端
public class CreateJwt {    public static void main(String[] args) {        JwtBuilder jwtBuilder = Jwts.builder().setId("88").setSubject("小白")                .setIssuedAt(new Date())                .signWith(SignatureAlgorithm.HS256, "liang")                //添加非私密的其它内容                .claim("companyId","123456")                .claim("companyName","腾讯");        String token = jwtBuilder.compact();        System.out.println(token);    }}
  1. 用户发送请求是携带token,解析token
public class ParseJwt {    public static void main(String[] args) {        String token="eyJhbGciOiJIUzI1NiJ9.eyJqdGkiOiI4OCIsInN1YiI6IuWwj-eZvSIsImlhdCI6MTU5MTE4ODgyNiwiY29tcGFueUlkIjoiMTIzNDU2IiwiY29tcGFueU5hbWUiOiLohb7orq8ifQ.jwJbTI_qCW365JgTtxeGz_jFXyFtQ4be-OCp5ezR4n8";        Claims claims = Jwts.parser().setSigningKey("liang").parseClaimsJws(token).getBody();        System.out.println(claims.getId());        System.out.println(claims.getSubject());        System.out.println(claims.getIssuedAt());        //解析自定义的claim中的内容        String companyId = (String) claims.get("companyId");        String companyName = (String) claims.get("companyName");        System.out.println(companyId);        System.out.println(companyName);    }}
  1. 将生成和解析封装成工具类
package com.springboot.utils;import io.jsonwebtoken.Claims;import io.jsonwebtoken.JwtBuilder;import io.jsonwebtoken.Jwts;import io.jsonwebtoken.SignatureAlgorithm;import lombok.Getter;import lombok.Setter;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.stereotype.Component;import java.util.Date;import java.util.Map;@Getter@Setter@ConfigurationProperties("jwt.config")@Componentpublic class JwtUtils {    //签名私钥    private String key;    //签名有效时间    private long ttl;    public String createJwtToken(String id, String name, Map<String,Object> map){        //设置失效时间        //获取当前时间        long now=System.currentTimeMillis();        //当前时间+有效时间=过期时间        long exp=now+ttl;        //创建JwtBuilder        JwtBuilder jwtBuilder = Jwts.builder().setId(id).setSubject(name)                .setIssuedAt(new Date())                .signWith(SignatureAlgorithm.HS256, key);        //根据map设置clamis        jwtBuilder.setClaims(map);        //设置失效时间        jwtBuilder.setExpiration(new Date(exp));        String token = jwtBuilder.compact();        return token;    }    public Claims parseToken(String token){        Claims claims = Jwts.parser().setSigningKey("liang").parseClaimsJws(token).getBody();        return claims;    }}