上一篇 SpringBoot Mybatis-Plus逻辑删除和自动填入默认值
一、前言
- 封装返回结果,错误码、提示消息、返回数据。
- 统一的异常拦截,对业务上手动抛出的异常或者系统自己抛出的异常进行统一拦截,统一返回数据给前端。
- JWT(Json Web Token),就是接口令牌,令牌在登录成功的时候返回给前端,前端保存下来,后面所有的请求要传回令牌给服务端,服务端验证令牌来决定放不放行。并且令牌中可以保存用户ID、用户名等信息。
- 代码用到了Mybatis-Plus,可以看我之前的文章
二、目录结构
三、Maven依赖包
在pom.xml dependencies
添加下面依赖
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.6.5</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-crypto</artifactId>
<version>5.3.3.RELEASE</version>
</dependency>
- jjwt就 Java Json Web Token
- hutool-all 封装了很多好用的Java工具类,强烈推荐,非常好用,官网地址:https://www.hutool.cn/
- spring-security-crypto 密码加密和解码工具
四、封装统一返回结果
CommonResult 类
package com.llh.springbootdemo.config;
/**
* @author llh
*/
public class CommonResult<T> {
private Integer code;
private String msg;
private T data;
public CommonResult(int code, String msg) {
this.code = code;
this.msg = msg;
}
public CommonResult(int code, String msg, T data) {
this.code = code;
this.msg = msg;
this.data = data;
}
public static <T> CommonResult<T> success(T t) {
return new CommonResult<T>(200, "操作成功", t);
}
public static <T> CommonResult<T> error(T t) {
return new CommonResult<T>(300, "操作失败", t);
}
public Integer getCode() {
return code;
}
public void setCode(Integer code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
@Override
public String toString() {
return "CommonResult{" +
"code=" + code +
", msg='" + msg + '\'' +
", data=" + data +
'}';
}
}
- 使用
@PostMapping("/register")
public CommonResult<Boolean> register(@RequestBody UserInfo userInfo) {
return CommonResult.success(userInfoService.register(userInfo));
}
@PostMapping("/login")
public CommonResult<String> login(@RequestBody UserInfo userInfo) {
return CommonResult.success(userInfoService.login(userInfo));
}
返回结果如下:
{
"code": 200,
"msg": "操作成功",
"data": true
}
五、统一异常拦截
GlobalExceptionHandler 类
package com.llh.springbootdemo.config;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
/**
* @author llh
*/
@RestControllerAdvice
public class GlobalExceptionHandler {
@ExceptionHandler(Exception.class)
public CommonResult<String> exceptionHandler(Exception e) {
return CommonResult.error(e.getMessage());
}
}
- 这里只是做了Exception的处理,您可以加上自定义的异常处理。
六、注册功能
PasswordEncoder#encode对密码进行加密,加密是非对称加密,就是相同的密码加密后的字符串都不一样。
@Override
public Boolean register(UserInfo userInfo) {
List<UserInfo> selectedList = list(new LambdaQueryWrapper<UserInfo>()
.eq(UserInfo::getUsername, userInfo.getUsername()));
if (!selectedList.isEmpty()) {
throw new RuntimeException("注册失败,该用户名已存在");
}
// 密码加密
PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
String encodedPassword = passwordEncoder.encode(userInfo.getPassword());
userInfo.setPassword(encodedPassword);
return save(userInfo);
}
七、登录功能
PasswordEncoder#matches验证密码
@Override
public String login(UserInfo userInfo) {
List<UserInfo> selectedList = list(new LambdaQueryWrapper<UserInfo>()
.eq(UserInfo::getUsername, userInfo.getUsername()));
if (selectedList.isEmpty()) {
throw new RuntimeException("登录失败,账号不存在");
}
UserInfo selected = selectedList.get(0);
String encodedPassword = selected.getPassword();
// 判断密码是否正确
PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
boolean result = passwordEncoder.matches(userInfo.getPassword(), encodedPassword);
if (!result) {
throw new RuntimeException("登录失败,用户密码错误");
}
// 生成令牌
HashMap<String, Object> map = new HashMap<>(2);
map.put("userId", selected.getId());
String token = JwtUtil.generateToken(map);
return token;
}
八、JWT的生成与验证工具类
JwtUtil 类
package com.llh.springbootdemo.utils;
import cn.hutool.core.date.DateUtil;
import io.jsonwebtoken.ExpiredJwtException;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
import java.util.Date;
import java.util.Map;
/**
* @author llh
*/
public class JwtUtil {
/**
* 令牌密码 不少于32位
*/
private static final String SECRET = "token_secret";
/**
* 令牌前缀
*/
private static final String TOKEN_PREFIX = "Bearer";
/**
* 令牌过期时间
*/
private static final Integer EXPIRE_SECONDS = 60 * 60 * 24 * 7;
/**
* 生成令牌
*/
public static String generateToken(Map<String, Object> map) {
String jwt = Jwts.builder()
.setSubject("user info").setClaims(map)
.signWith(SignatureAlgorithm.HS512, SECRET)
.setExpiration(DateUtil.offsetSecond(new Date(), EXPIRE_SECONDS))
.compact();
return TOKEN_PREFIX + "_" + jwt;
}
/**
* 验证令牌
*/
public static Map<String, Object> resolveToken(String token) {
if (token == null) {
throw new RuntimeException("令牌为空");
}
try {
return Jwts.parser()
.setSigningKey(SECRET)
.parseClaimsJws(token.replaceFirst(TOKEN_PREFIX + "_", ""))
.getBody();
} catch (ExpiredJwtException e) {
throw new RuntimeException("令牌已过期");
} catch (Exception e) {
throw new RuntimeException("令牌解析异常");
}
}
}
九、统一请求拦截
拦截所有的请求进入拦截器,从请求头获取令牌,解析令牌,并保存用户ID到上下文对象中
TokenInterceptor 类 令牌拦截器
package com.llh.springbootdemo.config;
import com.llh.springbootdemo.utils.JwtUtil;
import org.springframework.web.servlet.HandlerInterceptor;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
/**
* @author llh
*/
public class TokenInterceptor implements HandlerInterceptor {
/**
* 请求头
*/
private static final String HEADER_AUTH = "Authorization";
/**
* 安全的url,不需要令牌
*/
private static final List<String> SAFE_URL_LIST = Arrays.asList("/userInfo/login", "/userInfo/register");
@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {
response.setContentType("application/json; charset=utf-8");
String url = request.getRequestURI().substring(request.getContextPath().length());
System.out.println(url);
// 登录和注册等请求不需要令牌
if (SAFE_URL_LIST.contains(url)) {
return true;
}
// 从请求头里面读取token
String token = request.getHeader(HEADER_AUTH);
if (token == null) {
throw new RuntimeException("请求失败,令牌为空");
}
// 解析令牌
Map<String, Object> map = JwtUtil.resolveToken(token);
Long userId = Long.parseLong(map.get("userId").toString());
ContextHolder.setUserId(userId);
return true;
}
@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) {
ContextHolder.shutdown();
}
}
- 所有的请求都通过
preHandle
方法 -
ContextHolder.setUserId(userId);
请求开始将解析的用户id放入上下文对象。 -
ContextHolder.shutdown();
请求结束从上下文对象中剔除用户id。
WebMvcConfiguration 类 添加拦截器到MVC配置中
package com.llh.springbootdemo.config;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurationSupport;
/**
* @author llh
*/
@Configuration
public class WebMvcConfiguration extends WebMvcConfigurationSupport {
@Override
public void addInterceptors(InterceptorRegistry registry) {
registry.addInterceptor(new TokenInterceptor());
}
}
ContextHolder 类 上下文对象类
package com.llh.springbootdemo.config;
/**
* @author llh
*/
public class ContextHolder {
public static ThreadLocal<Long> context = new ThreadLocal<>();
public static void setUserId(Long userId) {
context.set(userId);
}
public static Long getUserId() {
return context.get();
}
public static void shutdown() {
context.remove();
}
}
- 主要用到了ThreadLocal,就是在一个请求线程中都可以获取到上下文对象。
- 如修改密码
Long userId = ContextHolder.getUserId();
获取用户id。 - 修改密码根据用户id去更新数据,用户id直接从上下文对象中拿,这样就不用从前端传过来,如果从前端传过来,相当于任何人都能修改其它人的密码了,非常不安全。
- 从上下文中拿,也就是从令牌中拿,对接口就行了保护,只能自己操作自己的数据。
@Override
public Boolean changePassword(UserInfo userInfo) {
// 密码加密
PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
String encodedPassword = passwordEncoder.encode(userInfo.getPassword());
UserInfo updateUserInfo = new UserInfo();
updateUserInfo.setPassword(encodedPassword);
// 从上下文对象里面获取用户id,而不是用户传过来的
Long userId = ContextHolder.getUserId();
updateUserInfo.setId(userId);
return updateById(updateUserInfo);
}
十、完整的代码
UserInfoService
package com.llh.springbootdemo.service;
import com.baomidou.mybatisplus.extension.service.IService;
import com.llh.springbootdemo.entity.UserInfo;
/**
* @author llh
*/
public interface UserInfoService extends IService<UserInfo> {
/**
* 注册
*
* @param userInfo 注册信息
* @return 是否成功
*/
Boolean register(UserInfo userInfo);
/**
* 登录
*
* @param userInfo 登录信息
* @return 令牌
*/
String login(UserInfo userInfo);
/**
* 更改密码
*
* @param userInfo 用户信息
* @return 是否成功
*/
Boolean changePassword(UserInfo userInfo);
}
UserInfoServiceImpl
package com.llh.springbootdemo.service.impl;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.llh.springbootdemo.config.ContextHolder;
import com.llh.springbootdemo.entity.UserInfo;
import com.llh.springbootdemo.mapper.UserInfoMapper;
import com.llh.springbootdemo.service.UserInfoService;
import com.llh.springbootdemo.utils.JwtUtil;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;
import java.util.HashMap;
import java.util.List;
/**
* @author llh
*/
@Service
public class UserInfoServiceImpl extends ServiceImpl<UserInfoMapper, UserInfo> implements UserInfoService {
@Override
public Boolean register(UserInfo userInfo) {
List<UserInfo> selectedList = list(new LambdaQueryWrapper<UserInfo>()
.eq(UserInfo::getUsername, userInfo.getUsername()));
if (!selectedList.isEmpty()) {
throw new RuntimeException("注册失败,该用户名已存在");
}
// 密码加密
PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
String encodedPassword = passwordEncoder.encode(userInfo.getPassword());
userInfo.setPassword(encodedPassword);
return save(userInfo);
}
@Override
public String login(UserInfo userInfo) {
List<UserInfo> selectedList = list(new LambdaQueryWrapper<UserInfo>()
.eq(UserInfo::getUsername, userInfo.getUsername()));
if (selectedList.isEmpty()) {
throw new RuntimeException("登录失败,账号不存在");
}
UserInfo selected = selectedList.get(0);
String encodedPassword = selected.getPassword();
// 判断密码是否正确
PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
boolean result = passwordEncoder.matches(userInfo.getPassword(), encodedPassword);
if (!result) {
throw new RuntimeException("登录失败,用户密码错误");
}
// 生成令牌
HashMap<String, Object> map = new HashMap<>(2);
map.put("userId", selected.getId());
String token = JwtUtil.generateToken(map);
return token;
}
@Override
public Boolean changePassword(UserInfo userInfo) {
// 密码加密
PasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
String encodedPassword = passwordEncoder.encode(userInfo.getPassword());
UserInfo updateUserInfo = new UserInfo();
updateUserInfo.setPassword(encodedPassword);
// 从上下文对象里面获取用户id,而不是用户传过来的
Long userId = ContextHolder.getUserId();
updateUserInfo.setId(userId);
return updateById(updateUserInfo);
}
}
UserInfoController
package com.llh.springbootdemo.controller;
import com.llh.springbootdemo.config.CommonResult;
import com.llh.springbootdemo.entity.UserInfo;
import com.llh.springbootdemo.service.UserInfoService;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import javax.annotation.Resource;
/**
* @author llh
*/
@RestController
@RequestMapping("/userInfo")
public class UserInfoController {
@Resource
private UserInfoService userInfoService;
@PostMapping("/register")
public CommonResult<Boolean> register(@RequestBody UserInfo userInfo) {
return CommonResult.success(userInfoService.register(userInfo));
}
@PostMapping("/login")
public CommonResult<String> login(@RequestBody UserInfo userInfo) {
return CommonResult.success(userInfoService.login(userInfo));
}
@PostMapping("/changePassword")
public CommonResult<Boolean> changePassword(@RequestBody UserInfo userInfo) {
return CommonResult.success(userInfoService.changePassword(userInfo));
}
}
pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.3.2.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<modelVersion>4.0.0</modelVersion>
<groupId>com.llh</groupId>
<artifactId>spring-boot-demo</artifactId>
<version>1.0.0</version>
<name>spring-boot-demo</name>
<description>springboot project description</description>
<properties>
<mybatis-spring-boot.version>2.1.4</mybatis-spring-boot.version>
<mybatis-plus.version>3.4.2</mybatis-plus.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis-spring-boot.version}</version>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>${mybatis-plus.version}</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
<dependency>
<groupId>cn.hutool</groupId>
<artifactId>hutool-all</artifactId>
<version>5.6.5</version>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-crypto</artifactId>
<version>5.3.3.RELEASE</version>
</dependency>
</dependencies>
</project>
十一、测试
11.1 注册
查看数据库 密码是加密后的
11.2 登录
登录成功返回令牌
11.3 修改密码
需要在请求头Authorization
加上令牌
密码修改由123456->12345678
十二、结语
源码地址:https://github.com/tigerleeli/xiaohuge-blog/tree/master/spring-boot-jwt