Java implements single sign-on (token)

Single sign-on implementation (java)

1. Import dependent JWT

<!-- JWT-->
 <dependency>
      <groupId>io.jsonwebtoken</groupId>
      <artifactId>jjwt</artifactId>
      <version>0.7.0</version>
  </dependency>

2. Write application.yml

server:
  port: 9006

spring:
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.1.6:8848
  datasource:
    url: jdbc:mysql://localhost:3306/mybatis-plus?useUnicode=true &characterEncoding=utf-8 &rewriteBatchedStatements=true &useSSL=true &serverTimezone=GMT+8
    username: root
    password: 12345
    driver-class-name: com.mysql.cj.jdbc.Driver

mybatis-plus:
  configuration:
    log-impl: org.apache.ibatis.logging.stdout.StdOutImpl

3. Write Utils JwtUtils

package com.wen.utils;

import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.util.StringUtils;

import javax.servlet.http.HttpServletRequest;
import java.util.Date;
/**
 * @Author OY
 * @Date 2021/3/26
 */
public class JwtUtils {<!-- -->

    //constant
    public static final long EXPIRE = 1000 * 60 * 60 * 24; //token expiration time
    public static final String APP_SECRET = "ukc8BDbRigUDaY6pZFfWus2jZWLPHO"; //Secret key

    //Method to generate token string
    public static String getJwtToken(String id, String nickname){<!-- -->

        String JwtToken = Jwts.builder()
                .setHeaderParam("typ", "JWT")
                .setHeaderParam("alg", "HS256")

                .setSubject("guli-user")
                .setIssuedAt(new Date())
                .setExpiration(new Date(System.currentTimeMillis() + EXPIRE))

                .claim("id", id) //Set the main part of the token and store user information
                .claim("nickname", nickname)

                .signWith(SignatureAlgorithm.HS256, APP_SECRET)
                .compact();

        return JwtToken;
    }

    /**
     * Determine whether the token exists and is valid
     * @param jwtToken
     * @return
     */
    public static boolean checkToken(String jwtToken) {<!-- -->
        if(StringUtils.isEmpty(jwtToken)) return false;
        try {<!-- -->
            Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        } catch (Exception e) {<!-- -->
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * Determine whether the token exists and is valid
     * @param request
     * @return
     */
    public static boolean checkToken(HttpServletRequest request) {<!-- -->
        try {<!-- -->
            String jwtToken = request.getHeader("token");
            if(StringUtils.isEmpty(jwtToken)) return false;
            Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        } catch (Exception e) {<!-- -->
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * Get member id based on token string
     * @param request
     * @return
     */
    public static String getMemberIdByJwtToken(HttpServletRequest request) {<!-- -->
        String jwtToken = request.getHeader("token");
        if(StringUtils.isEmpty(jwtToken)) return "";
        Jws<Claims> claimsJws = Jwts.parser().setSigningKey(APP_SECRET).parseClaimsJws(jwtToken);
        Claims claims = claimsJws.getBody();
        return (String)claims.get("id");
    }
}

4. Write controller

package com.wen.ucenter.controller;


import com.wen.ucenter.pojo.UcenterMember;
import com.wen.ucenter.service.UcenterMemberService;
import com.wen.utils.R;
import io.swagger.annotations.ApiOperation;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

/**
 * <p>
 * Member table front-end controller
 *</p>
 *
 * @author wenjie
 * @since 2023-11-08
 */
@CrossOrigin
@RestController
@RequestMapping("/ucent/ucenter-member")
@SuppressWarnings({<!-- -->"all"})
public class UcenterMemberController {<!-- -->

    @Resource
    UcenterMemberService memberService;

    @ApiOperation(value = "Member Registration")
    @PostMapping("register")
    public R register(@RequestBody UcenterMember member) {<!-- -->


        return R.ok();
    }

    @ApiOperation(value = "Member login")
    @PostMapping("login")
    public R login(@RequestBody UcenterMember member) {<!-- -->

        //Call service method
        String token = memberService.login(member);

        return R.ok().data("token",token);
    }
}

5. Write service

package com.wen.ucenter.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.wen.ucenter.pojo.UcenterMember;
import com.wen.ucenter.mapper.UcenterMemberMapper;
import com.wen.ucenter.service.UcenterMemberService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.wen.utils.JwtUtils;
import com.wen.utils.exceptionhandler.GuliException;
import com.wen.utils.exceptionhandler.MD5;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

/**
 * <p>
 * Member table service implementation class
 *</p>
 *
 * @author wenjie
 * @since 2023-11-08
 */
@Service
public class UcenterMemberServiceImpl extends ServiceImpl<UcenterMemberMapper, UcenterMember>
        implements UcenterMemberService {<!-- -->



    @Override
    public String login(UcenterMember member) {<!-- -->

        String mobile = member.getMobile();
        String password = member.getPassword();

        //Judge whether mobile phone number password is empty
        if(StringUtils.isEmpty(mobile) || StringUtils.isEmpty(password)) {<!-- -->

            throw new GuliException(20001,"Username or password cannot be empty");
        }

        //Determine whether the mobile phone number exists
        QueryWrapper<UcenterMember> qw = new QueryWrapper<>();
        qw.lambda().eq(UcenterMember::getMobile,mobile);
        UcenterMember one = baseMapper.selectOne(qw);
        if(one == null) {<!-- -->
            throw new GuliException(20001,"Username does not exist");
        }



        //Determine whether the password is correct
        if(!MD5.encrypt(password).equals(one.getPassword())) {<!-- -->
            throw new GuliException(20001,"Login failed");
        }

        //Determine whether the user is disabled
        if(one.getIsDisabled()) {<!-- -->
            throw new GuliException(20001,"Login failed");
        }

        //login successful
        //Generate token string
        String jwtToken = JwtUtils.getJwtToken(one.getId(), one.getNickname());
        return jwtToken;
    }

}

6. Obtain user information based on token

@GetMapping("getMemberInfo")
    public R getMemberInfo(HttpServletRequest request) {<!-- -->
        //Call the jwt tool class. Return the user ID based on the header information of the request object.
        String memberId = JwtUtils.getMemberIdByJwtToken(request);
        //Query user information based on user id
        UcenterMember member = memberService.getById(memberId);

        if(member == null) {<!-- -->
            throw new GuliException(20001,"The user does not exist");
        }

        return R.ok().data("userInfo",member);

    }