一、实现流程
1.注册
2.登录
3.登录保持【状态续签】
二、实现方法
项目结构
1.引入依赖
<!-- spring-web --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <!-- mysql连接器 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> </dependency> <!-- Mybatis Plus --> <dependency> <groupId>com.baomidou</groupId> <artifactId>mybatis-plus-boot-starter</artifactId> <version>3.4.3.4</version> </dependency> <!-- druid --> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.2.8</version> </dependency> <!-- jwt --> <dependency> <groupId>com.auth0</groupId> <artifactId>java-jwt</artifactId> <version>3.10.3</version> </dependency>
2.application配置文件
spring:
application:
name: jwtLogin # 应用名称
datasource:
druid:
url: jdbc:mysql://192.168.0.111:3306/login_test?useSSL=false&serverTimezone=UTC
username: samon
password: 123456
driver-class-name: com.mysql.jdbc.Driver
server:
port: 8848 # 应用服务 WEB 访问端口
3.mysql建表
用户表
4.Bean
1.bean/user.java
用户bean
package com.cxstar.bean;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;
import java.util.Date;
@Data
public class User {
// 自增长id
@TableId(type = IdType.AUTO)
private Integer id;
private String userName;
private String passWord;
private Date createTime;
private Date lastLogin;
public User() {}
public User(Integer id, String userName) {
this.id = id;
this.userName = userName;
}
}
2.bean/ServiceRes.java
统一Service返回类
package com.cxstar.bean;
import lombok.Data;
@Data
public class ServiceRes {
private Integer code;
private String msg;
private String jwt;
private ServiceRes() {}
public ServiceRes(Integer code, String msg) {
this.code = code;
this.msg = msg;
}
public ServiceRes(Integer code, String msg, String jwt) {
this.code = code;
this.msg = msg;
this.jwt = jwt;
}
}
3.bean/ControllerRes.java
统一Controller返回类
package com.cxstar.bean;
import lombok.Data;
@Data
public class ControllerRes {
private Integer code;
private String msg;
public ControllerRes(Integer code, String msg) {
this.code = code;
this.msg = msg;
}
}
5.Mapper mapper/UserMapper.java
继承MP
package com.cxstar.mapper;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import com.cxstar.bean.User;
import org.apache.ibatis.annotations.Mapper;
@Mapper
public interface UserMapper extends BaseMapper<User> {
}
6.service service.userService.interface
登录、注册、改密业务【状态续签测试】
package com.cxstar.service;
import com.cxstar.bean.ServiceRes;
import com.cxstar.bean.User;
public interface userService {
// 注册
ServiceRes register(User user);
// 登录
ServiceRes login(User user);
// 改密【带权限业务，用于状态续签测试】
ServiceRes changePassWord(User user);
}
service.impl.UserServiceImpl.java
登录、注册、改密业务【状态续签测试】
package com.cxstar.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.cxstar.bean.ServiceRes;
import com.cxstar.bean.User;
import com.cxstar.mapper.UserMapper;
import com.cxstar.service.userService;
import com.cxstar.utils.JwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.DigestUtils;
import java.nio.charset.StandardCharsets;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
@Slf4j
@Service
public class UserServiceImpl implements userService {
@Autowired
UserMapper userMapper;
/**
* 注册
* @param user 用户类
* @return ServiceRes
*/
@Override
public ServiceRes register(User user) {
// 判断用户名是否唯一
if(this.checkUserNameIsUnique(user)) {
// 判断用户名密码是否合法
if(this.checkUserNameAndPassword(user)) {
// 密码MD5加密
user.setPassWord(this.MD5Code(user.getPassWord()));
// 加入创建时间
user.setCreateTime(new Date());
// 入库
userMapper.insert(user);
return new ServiceRes(1, "注册成功");
} else return new ServiceRes(-1, "用户名或密码不合法");
} else return new ServiceRes(-1, "用户名已存在");
}
/**
* 登录
* @param user 用户类
* @return ServiceRes
*/
@Override
public ServiceRes login(User user) {
// 判断用户名密码是否合法
if(this.checkUserNameAndPassword(user)) {
// 密码MD5加密
user.setPassWord(this.MD5Code(user.getPassWord()));
// 检查用户是否存在
User curUser = this.checkUserIsExit(user);
if(curUser!=null) {
// 更新用户最后登录时间
curUser.setLastLogin(new Date());
userMapper.updateById(curUser);
// 生成jwt
Map<String, String> payload = new HashMap<>();
payload.put("userId", curUser.getId().toString()); // 加入一些非敏感的用户信息
payload.put("userName", curUser.getUserName()); // 加入一些非敏感的用户信息
String jwt = JwtUtil.generateToken(payload);
return new ServiceRes(1, "登录成功", jwt);
} else return new ServiceRes(-1, "用户名或密码错误");
} else return new ServiceRes(-1, "用户名或密码不合法");
}
/**
* 改密业务
* @return ServiceRes
*/
@Override
public ServiceRes changePassWord(User user) {
if(this.updatePassWord(user)) return new ServiceRes(1, "改密成功");
else return new ServiceRes(-1, "改密失败");
}
/**
* 非对称加密
* @param text 明文
* @return 密文
*/
private String MD5Code(String text) {
return DigestUtils.md5DigestAsHex(text.getBytes(StandardCharsets.UTF_8));
}
/**
* 修改密码方法
* @param user 传入用户名和新密码
* @return 改密成功返回 true 失败返回 false
*/
private Boolean updatePassWord(User user) {
// 密码非对称加密
user.setPassWord(this.MD5Code(user.getPassWord()));
// 更新密码
return userMapper.updateById(user)>0;
}
/**
* 检查用户是否存在【用户名密码相同】
* @param user 用户类
* @return 用户存在返回 用户对象 不存在返回 null
*/
private User checkUserIsExit(User user) {
LambdaQueryWrapper<User> lqw = new LambdaQueryWrapper<>();
lqw.eq(User::getUserName, user.getUserName());
lqw.eq(User::getPassWord, user.getPassWord());
return userMapper.selectOne(lqw);
}
/**
* 判断用户名是否唯一
* @param user 用户类
* @return 唯一返回 true 不唯一返回 false
*/
private Boolean checkUserNameIsUnique(User user) {
LambdaQueryWrapper<User> lqw = new LambdaQueryWrapper<>();
lqw.eq(User::getUserName, user.getUserName());
List<User> userList = userMapper.selectList(lqw);
return userList.size() == 0;
}
/**
* 判断用户名密码是否合法
* @param user 用户类
* @return 满足 【英文字母、数字、下划线】 返回 true，否则返回 false
*/
private Boolean checkUserNameAndPassword(User user) {
String regex = "^[_a-z0-9A-Z]+$";
return user.getUserName().matches(regex) && user.getPassWord().matches(regex);
}
}
6.Controller controller/UserController.java
登录、注册、改密业务【状态续签测试】
package com.cxstar.controller;
import com.cxstar.bean.ControllerRes;
import com.cxstar.bean.ServiceRes;
import com.cxstar.bean.User;
import com.cxstar.service.userService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@Slf4j
@Controller
@ResponseBody
@RequestMapping("/user")
public class UserController {
@Autowired
userService userService;
@PostMapping("/register")
public ControllerRes register(User user) {
// 注册
ServiceRes serviceRes = userService.register(user);
return new ControllerRes(serviceRes.getCode(), serviceRes.getMsg());
}
@PostMapping("/login")
public ControllerRes login(User user, HttpServletResponse response) {
// 登录
ServiceRes serviceRes = userService.login(user);
// 登录成功后往响应头插入jwt
if(serviceRes.getJwt() != null) response.addHeader("access-token", serviceRes.getJwt());
return new ControllerRes(serviceRes.getCode(), serviceRes.getMsg());
}
@PutMapping("/pwd")
public ControllerRes changePassWord(User user, HttpServletRequest request) {
// 取出jwt中的用户
User jwtUser = (User)request.getAttribute("jwt-user");
// 合并jwt中用户的用户名与传入用户的新密码
// 此处不能直接使用传入的用户名，防止恶意修改其他用户的密码
user.setId(jwtUser.getId());
// 改密
ServiceRes serviceRes = userService.changePassWord(user);
return new ControllerRes(serviceRes.getCode(), serviceRes.getMsg());
}
}
7.JWT工具类 utils/JwtUtil.java
生成和解析 token 的方法
package com.cxstar.utils;
import com.auth0.jwt.JWT;
import com.auth0.jwt.JWTCreator;
import com.auth0.jwt.algorithms.Algorithm;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.auth0.jwt.interfaces.JWTVerifier;
import java.util.Calendar;
import java.util.Date;
import java.util.Map;
public class JwtUtil {
// 签名密钥
private static final String SECRET = "hello JWT *%$#$&";
/**
* 生成token
* @param payload token携带的信息
* @return token字符串
*/
public static String generateToken(Map<String,String> payload){
// 指定token过期时间
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.HOUR, 24); // 24小时
JWTCreator.Builder builder = JWT.create();
// 构建payload
payload.forEach(builder::withClaim);
// 指定签发时间、过期时间 和 签名算法，并返回token
String token = builder.withIssuedAt(new Date()).withExpiresAt(calendar.getTime()).sign(Algorithm.HMAC256(SECRET));
return token;
}
/**
* 解析token
* @param token token字符串
* @return 解析后的token类
*/
public static DecodedJWT decodeToken(String token){
JWTVerifier jwtVerifier = JWT.require(Algorithm.HMAC256(SECRET)).build();
DecodedJWT decodedJWT = jwtVerifier.verify(token);
return decodedJWT;
}
}
8.HandlerInterceptor拦截器 interceptor.java
拦截器业务实现
package com.cxstar.interceptor;
import com.alibaba.fastjson.JSONObject;
import com.auth0.jwt.exceptions.JWTDecodeException;
import com.auth0.jwt.exceptions.TokenExpiredException;
import com.auth0.jwt.interfaces.DecodedJWT;
import com.cxstar.bean.ControllerRes;
import com.cxstar.bean.User;
import com.cxstar.utils.JwtUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
/**
* 拦截需要授权的接口
*/
@Slf4j
public class PermisssionInterceptor implements HandlerInterceptor {
// 目标方法执行前调用
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws IOException {
// 检查用户JWT
String jwt = request.getHeader("access-token");
// 校验并取出私有信息
try {
// token 解码
DecodedJWT dj = JwtUtil.decodeToken(jwt);
// 取出基本用户信息加入请求头 --------------------------------------------------------------------------------
String userId = dj.getClaim("userId").asString();
String userName = dj.getClaim("userName").asString();
// jwt校验合格的，将 jwt 中存的用户信息加入请求头，不合格的，请求头存个空用户
request.setAttribute("jwt-user", userId!=null?new User(Integer.valueOf(userId), userName):new User());
// -------------------------------------------------------------------------------------------------------
// 计算当前时间是否超过过期时间的一半，如果是就帮用户续签 --------------------------
// 此处并不是永久续签，只是为 大于过期时间的一半 且 小于过期时间 的 token 续签
Long expTime = dj.getExpiresAt().getTime();
Long iatTime = dj.getIssuedAt().getTime();
Long nowTime = new Date().getTime();
if((nowTime-iatTime) > (expTime-iatTime)/2) {
// 生成新的jwt
Map<String, String> payload = new HashMap<>();
payload.put("userId", userId); // 加入一些非敏感的用户信息
payload.put("userName", userName); // 加入一些非敏感的用户信息
String newJwt = JwtUtil.generateToken(payload);
// 加入返回头
response.addHeader("access-token", newJwt);
}
// -----------------------------------------------------------------------
return true;
} catch (JWTDecodeException e) {
log.error("令牌错误");
addResBody(response, new ControllerRes(-1, "令牌错误")); // 新增返回体
return false;
} catch (TokenExpiredException e) {
log.error("令牌过期");
addResBody(response, new ControllerRes(-1, "令牌过期")); // 新增返回体
return false;
}
}
// 目标方法执行后调用
@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
HandlerInterceptor.super.postHandle(request, response, handler, modelAndView);
}
// 页面渲染前调用
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
}
private void addResBody(HttpServletResponse response, ControllerRes res) throws IOException {
response.setStatus(HttpServletResponse.SC_FORBIDDEN); // 设置状态码
response.setCharacterEncoding("UTF-8");
response.setContentType("application/json; charset=utf-8");
PrintWriter out = response.getWriter();
out.write(JSONObject.toJSONString(res));
out.flush();
out.close();
}
}
config/PermissionWebConfig.java
拦截器拦截规则
package com.cxstar.config;
import com.cxstar.interceptor.PermisssionInterceptor;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
@Configuration
public class PermissionWebConfig implements WebMvcConfigurer {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new PermisssionInterceptor())
.addPathPatterns("/**") // 拦截哪些页面
.excludePathPatterns("/user/login", "/user/register"); // 放行哪些页面
}
}
三、测试
1.注册
注册成功
数据入库
2.登录
登录成功
查看登录后返回的token
3.状态续签【登录保持】
使用上一步登录返回的 token 请求改密业务
当 JWT 存在时间小于 JWT 过期时间的一半时
业务会执行成功
执行业务不会返回续签的 token
当 JWT 存在时间大于 JWT 过期时间的一半 且 小于过期时间 时
业务会执行成功
执行业务会返回续签的 token，前端的下次请求需要使用新续签的 token
当 JWT 存在时间大于 JWT 过期时间 时
业务会执行失败
执行业务不会返回续签的 token
到此这篇关于SpringBoot+JWT实现注册、登录、状态续签的实战教程的文章就介绍到这了,更多相关SpringBoot JWT登录状态续签内容请搜索服务器之家以前的文章或继续浏览下面的相关文章希望大家以后多多支持服务器之家！
原文链接：https://blog.csdn.net/weixin_43721000/article/details/125042403
