关于JWT（Json Web Token）

灰太狼 2024-03-24 15:23 47阅读 0赞

![在这里插入图片描述][13744bae2c0a4d6a977c0b096372b931.png]  
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https://jwt.io/  
![在这里插入图片描述][02c815d34fac41c4a280947faf266773.png]  
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![在这里插入图片描述][97a8cffcb3524e5a85b22581b479d7a5.png]  
https://jwt.io/libraries?language=Java  
![在这里插入图片描述][dba21c087295475ca8351dee376baea7.png]

<dependency>
                <groupId>io.jsonwebtoken</groupId>
                <artifactId>jjwt</artifactId>
                <version>0.9.1</version>
            </dependency>

![在这里插入图片描述][ea718b9494014884b4481697833bc800.png]

package cn.tedu.csmallpassport;
    
    import io.jsonwebtoken.Claims;
    import io.jsonwebtoken.Jwts;
    import io.jsonwebtoken.SignatureAlgorithm;
    import org.junit.jupiter.api.Test;
    
    import java.util.Date;
    import java.util.HashMap;
    import java.util.Map;
    
    public class JwtTest {
        
        String secretKey = "kU4jrFA3iuI5jn25u743kfDs7a8pFEwS54hm";  // 盐值
    
        @Test
        public void generate() {
        
    
            Date date = new Date(System.currentTimeMillis() + 5 * 60 * 1000);
            Map<String, Object> claims = new HashMap<>();
            claims.put("id", "1233");
            claims.put("username", "zhangsan");
            String jwt = Jwts.builder()
            // Header（头部信息）：声明算法与Token的类型
                    .setHeaderParam("alg", "HS256")
                    .setHeaderParam("typ", "JWT")
            // Payload（载荷）：数据，表现为Claims
                    .setClaims(claims)
                    .setExpiration(date)   // 过期时间
            // Signature：验证签名
                    .signWith(SignatureAlgorithm.HS256, secretKey)
            // 完成
            .compact();
            System.out.println(jwt);  // eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjEyMzMiLCJleHAiOjE2ODA3NTA4MzQsInVzZXJuYW1lIjoiemhhbmdzYW4ifQ.7RNj9hWPX8ebFcYrBooFNAlKgc3AIV_WU_qF0wsbltQ
        }
    
        @Test
        public void parse() {
        
            try {
        
                String jwt = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJpZCI6IjEyMzMiLCJleHAiOjE2ODA3NTA4MzQsInVzZXJuYW1lIjoiemhhbmdzYW4ifQ.7RNj9hWPX8ebFcYrBooFNAlKgc3AIV_WU_qF0wsbltQ";
    
                Claims claims = Jwts.parser()
                        .setSigningKey(secretKey)
                        .parseClaimsJws(jwt)
                        .getBody();
    
                Long id = claims.get("id", Long.class);
                String username = claims.get("username", String.class);
    
                System.out.println("id = " + id);
                System.out.println("username = " + username);
            } catch (Throwable e) {
        
                e.printStackTrace();
            }
        }
    }

![在这里插入图片描述][fbd6fa692b424a3bafc8c4bf9787ae81.png]  
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![在这里插入图片描述][f058f839e1f34693a582a42f39cf961a.png]

## 在项目中使用JWT识别客户端 ##

![在这里插入图片描述][9e19dfc7b2134a18b0b192f518bc792c.png]  
![在这里插入图片描述][6cd3d81970a7407b9584dedc90576917.png]  
![在这里插入图片描述][3115e57a3659493a88a1dd8c4a961693.png]

## 验证登录成功后响应JWT ##

![在这里插入图片描述][7aca0b225e1b47d6a24fc1628fac2323.png]  
![在这里插入图片描述][861e76db1e014eea9ac27a4d34d34aed.png]  
![在这里插入图片描述][3122294663fd4b6a9dc4f3968d80ea0d.png]

/**
         * 验证管理员登录
         * @param adminLoginDTO 管理员的登录信息，至少封装用户名与密码原文
         * @return 验证登录通过后的JWT
         */
        String login(AdminLoginDTO adminLoginDTO);

![在这里插入图片描述][f25e5a6c436145dda34f51900bca85a1.png]

@Override
    public String login(AdminLoginDTO adminLoginDTO) {
        
        log.debug("开始处理【管理员登录】的业务，参数：{}", adminLoginDTO);
    
        // 创建认证信息对象
        Authentication authentication = new UsernamePasswordAuthenticationToken(
                adminLoginDTO.getUsername(), adminLoginDTO.getPassword());
        // 调用认证管理器执行认证
        Authentication authenticationResult
                = authenticationManager.authenticate(authentication);
        log.debug("验证登录成功，返回的Authentication为：{}", authenticationResult);
        // 如果没有出现异常，则表示验证登录成功，需要将认证信息存入到Security上下文
        // log.debug("即将向SecurityContext中存入Authentication");
        // SecurityContext securityContext = SecurityContextHolder.getContext();
        // securityContext.setAuthentication(authenticationResult);
    
        // ========== 以下是新增的代码片段 ==========
        
        // 处理验证登录成功后的结果中的当事人
        Object principal = authenticationResult.getPrincipal();
        log.debug("获取验证登录成功后的结果中的当事人：{}", principal);
        AdminDetails adminDetails = (AdminDetails) principal;
    
        // 需要写入到JWT中的数据
        Map<String, Object> claims = new HashMap<>();
        claims.put("id", adminDetails.getId());
        claims.put("username", adminDetails.getUsername());
        log.debug("即将生成JWT数据，包含的账号信息：{}", claims);
    
        // 生成JWT，并返回JWT
        String secretKey = "kU4jrFA3iuI5jn25u743kfDs7a8pFEwS54hm";
        Date exp = new Date(System.currentTimeMillis() + 10 * 24 * 60 * 60 * 1000);
        String jwt = Jwts.builder()
                .setHeaderParam("alg", "HS256")
                .setHeaderParam("typ", "JWT")
                .setClaims(claims)
                .setExpiration(exp)
                .signWith(SignatureAlgorithm.HS256, secretKey)
                .compact();
        log.debug("生成了JWT数据，并将返回此JWT数据：{}", jwt);
        return jwt;
    }

![在这里插入图片描述][4d08f23889a042a6bc460df1a3afd29f.png]

@PostMapping("/login")
        public JsonResult login(AdminLoginDTO adminLoginDTO) {
        
            log.debug("开始处理【管理员登录】的请求，参数：{}", adminLoginDTO);
            String jwt = adminService.login(adminLoginDTO);
            return JsonResult.ok(jwt);
        }

![在这里插入图片描述][2fb64ca52ff046eeb94cb03412f63e91.png]  
![在这里插入图片描述][21a53b3e35bf4572b7b7a56eb4295021.png]  
![在这里插入图片描述][59b76f1bd1434d73a5b206a193b5bb3b.png]

## 解析客户端携带的JWT（使用过滤器） ##

![在这里插入图片描述][a22ba885f1284e04ada2dc6661e1a8a8.png]  
![在这里插入图片描述][e5c699af9fca4f198e05bd57fdf6f89b.png]

在项目的根包下创建`filter.JwtAuthorizationFilter`类，继承自`OncePerRequestFilter`抽象类（将间接的实现`Filter`接口），并在类上添加组件注解：

package cn.tedu.csmall.passport.filter;
    
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.stereotype.Component;
    import org.springframework.web.filter.OncePerRequestFilter;
    
    import javax.servlet.FilterChain;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    @Slf4j
    @Component
    public class JwtAuthorizationFilter extends OncePerRequestFilter {
        
    
        @Override
        protected void doFilterInternal(
                HttpServletRequest request,
                HttpServletResponse response,
                FilterChain filterChain) throws ServletException, IOException {
        
        }
    
    }

在处理过程中，首先，需要尝试接收客户端携带的JWT：

@Slf4j
    @Component
    public class JwtAuthorizationFilter extends OncePerRequestFilter {
        
        @Override
        protected void doFilterInternal(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, FilterChain filterChain) throws ServletException, IOException {
        
            // 根据业内惯用的做法，客户端应该将JWT保存在请求头（Request Header）中的名为Authorization的属性名
            String jwt = httpServletRequest.getHeader("Authorization");
            log.debug("尝试接收客户端携带的JWT数据，JWT数据：{}", jwt);
            filterChain.doFilter(request, response);
        }
    }

![在这里插入图片描述][babe092e726e4dac839009768633f386.png]

@Slf4j
    @Configuration
    @EnableGlobalMethodSecurity(prePostEnabled = true)
    public class SecurityConfiguration extends WebSecurityConfigurerAdapter {
        
    
        // 新增代码
        @Autowired
        private JwtAuthorizationFilter jwtAuthorizationFilter;
        
        // 暂不关心其它代码
        
    }

![在这里插入图片描述][d6278e80a8c34257a6e33bbf00c5bb13.png]

// 将自定义的JWT过滤器添加在Spring Security的UsernamePasswordAuthenticationFilter之前
    http.addFilterBefore(jwtAuthorizationFilter, 
                         UsernamePasswordAuthenticationFilter.class);

![在这里插入图片描述][53df4ee9bf8c4e5daa638f6f45e43777.png]  
![在这里插入图片描述][78dcca6cbe50406ca3f8da3b76d1b26c.png]  
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![在这里插入图片描述][cd62a388e8f54ce7b60a229b89eab8f3.png]

package cn.tedu.csmall.passport.filter;
    
    import io.jsonwebtoken.Claims;
    import io.jsonwebtoken.Jwts;
    import lombok.extern.slf4j.Slf4j;
    import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
    import org.springframework.security.core.Authentication;
    import org.springframework.security.core.authority.SimpleGrantedAuthority;
    import org.springframework.security.core.context.SecurityContext;
    import org.springframework.security.core.context.SecurityContextHolder;
    import org.springframework.stereotype.Component;
    import org.springframework.util.StringUtils;
    import org.springframework.web.filter.OncePerRequestFilter;
    
    import javax.servlet.FilterChain;
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    import java.util.ArrayList;
    import java.util.Collection;
    
    /**
     * <p>处理JWT的过滤器类</p>
     *
     * <p>此过滤器类的主要职责：</p>
     * <ul>
     *     <li>尝试接收客户端携带的JWT</li>
     *     <li>尝试解析接收到的JWT</li>
     *     <li>将解析成功后得到的结果创建为Authentication并存入到SecurityContext中</li>
     * </ul>
     *
     * @author java@tedu.cn
     * @version 0.0.1
     */
    @Slf4j
    @Component
    public class JwtAuthorizationFilter extends OncePerRequestFilter {
        
    
        public static final int JWT_MIN_LENGTH = 113;
    
        @Override
        protected void doFilterInternal(
                HttpServletRequest request,
                HttpServletResponse response,
                FilterChain filterChain) throws ServletException, IOException {
        
            // 根据业内惯用的做法，客户端应该将JWT保存在请求头（Request Header）中的名为Authorization的属性名
            String jwt = request.getHeader("Authorization");
            log.debug("尝试接收客户端携带的JWT数据，JWT：{}", jwt);
    
            // 判断客户端是否携带了基本有效的JWT
            if (!StringUtils.hasText(jwt) || jwt.length() < JWT_MIN_LENGTH) {
        
                // 客户端没有携带有铲的JWT，则“放行”，交由后续的组件继续处理
                filterChain.doFilter(request, response);
                // 【重要】终止当前方法的执行，不执行接下来的代码
                return;
            }
    
            // TODO：1-声明secretKey不合理，应该集中管理
            // TODO：2-解析JWT时可能出现异常，需要处理
            // 客户端携带了基本有效的JWT，则尝试解析JWT
            String secretKey = "kU4jrFA3iuI5jn25u743kfDs7a8pFEwS54hm";
            Claims claims = Jwts.parser()
                    .setSigningKey(secretKey)
                    .parseClaimsJws(jwt)
                    .getBody();
            Long id = claims.get("id", Long.class);
            String username = claims.get("username", String.class);
            log.debug("从JWT中解析得到的管理员ID：{}", id);
            log.debug("从JWT中解析得到的管理员用户名：{}", username);
    
            // TODO：3-使用用户名的字符串作为“当事人”并不是最优解
            // TODO：4-需要调整使用真实的权限
            // 基于解析JWT的结果创建Authentication对象
            Object principal = username; // 当事人：暂时使用用户名
            Object credentials = null; // 凭证：应该为null
            Collection<SimpleGrantedAuthority> authorities = new ArrayList<>();
            authorities.add(new SimpleGrantedAuthority("暂时放一个山寨的权限"));
            Authentication authentication = new UsernamePasswordAuthenticationToken(
                    principal, credentials, authorities);
    
            // 将Authentication存入到SecurityContext中
            log.debug("向SecurityContext中存入Authentication：{}", authentication);
            SecurityContext securityContext = SecurityContextHolder.getContext();
            securityContext.setAuthentication(authentication);
    
            // 过滤器链继续执行，相当于“放行”
            filterChain.doFilter(request, response);
        }
    
    }

![在这里插入图片描述][2cb950a468db42c39eaf9577b49455f5.png]

## 关于SecurityContext中的认证信息 ##

![在这里插入图片描述][52af8812a92e4db9bd7388d8ddca392d.png]  
![在这里插入图片描述][50f1a4d14e3448ffb995798a4c4be3fd.png]  
![在这里插入图片描述][0eff2ff77411487a98b6a1bccb463648.png]  
![在这里插入图片描述][4ca013c82d5b4acdb87a3329fbf8a46d.png]

// 清空SecurityContext，避免【此前携带JWT成功访问后，在接下来的一段时间内不携带JWT也能访问】
            SecurityContextHolder.clearContext();

![在这里插入图片描述][6e54432b61da4bfb8bd20f42f532db0d.png]

// 将Session策略设置为“从不使用”：STATELESS=无状态，即从不使用Session，NEVER=从不主动创建Session
            http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS);

## 关于当事人 ##

![在这里插入图片描述][66a425107d574625b6b4ede19c4dded9.png]  
![在这里插入图片描述][c0897e957d644546ae10b69a5789b61c.png]

package cn.tedu.csmallpassport.security;
    
    import lombok.Data;
    
    import java.io.Serializable;
    
    @Data
    public class LoginPrincipal implements Serializable {
        
    
        private Long id;
        private String username;
    
    }

![在这里插入图片描述][e542f0810b074399a83f7105f0aeca63.png]  
![在这里插入图片描述][f1e1b02b299f46d3b57342410f363628.png]  
![在这里插入图片描述][fa36b6f675174c22ba641d1e6bfc29c3.png]  
![在这里插入图片描述][1b66918f70a546e995a25cb3712637bc.png]  
![在这里插入图片描述][7e8cd7030c9641c3aea875f1958e4f19.png]  
![在这里插入图片描述][446425d90a144d9e8dce490ddb79e55a.png]

## 处理解析JWT时的异常 ##

![在这里插入图片描述][659742d1505243889c5889f55a6e7150.png]  
![在这里插入图片描述][b8e95300ee8840e5a545532b408484a4.png]

ERR_JWT_EXPIRED(600, "JWT已过期"),
        ERR_JWT_SIGNATURE(601, "验证签名失败"),
        ERR_JWT_MALFORMED(602, "JWT格式错误"),

![在这里插入图片描述][adb41d8d3eb94707a39f6cec8e3e1fa4.png]

// 客户端携带了基本有效的JWT，则尝试解析JWT
    Claims claims = null;
    response.setContentType("application/json; charset=utf-8;");
    try {
        
        claims = Jwts.parser()
                .setSigningKey(secretKey)
                .parseClaimsJws(jwt)
                .getBody();
    } catch (ExpiredJwtException e) {
        
        String message = "您的登录信息已过期，请重新登录！";
        log.warn(message);
        JsonResult jsonResult = JsonResult.fail(ServiceCode.ERR_JWT_EXPIRED, message);
        String jsonResultString = JSON.toJSONString(jsonResult);
        PrintWriter writer = response.getWriter();
        writer.println(jsonResultString);
        writer.close();
        return;
    } catch (SignatureException e) {
        
        String message = "非法访问！";
        log.warn(message);
        JsonResult jsonResult = JsonResult.fail(ServiceCode.ERR_JWT_SIGNATURE, message);
        String jsonResultString = JSON.toJSONString(jsonResult);
        PrintWriter writer = response.getWriter();
        writer.println(jsonResultString);
        writer.close();
        return;
    } catch (MalformedJwtException e) {
        
        String message = "非法访问！";
        log.warn(message);
        JsonResult jsonResult = JsonResult.fail(ServiceCode.ERR_JWT_MALFORMED, message);
        String jsonResultString = JSON.toJSONString(jsonResult);
        PrintWriter writer = response.getWriter();
        writer.println(jsonResultString);
        writer.close();
        return;
    } catch (Throwable e) {
        
        String message = "服务器忙，请稍后再次尝试！（开发过程中，如果看到此提示，请检查控制台的信息，并在JWT过滤器补充处理此异常）";
        log.warn(message);
        JsonResult jsonResult = JsonResult.fail(ServiceCode.ERR_UNKNOWN, message);
        String jsonResultString = JSON.toJSONString(jsonResult);
        PrintWriter writer = response.getWriter();
        writer.println(jsonResultString);
        writer.close();
    }

## 处理未登录的错误 ##

![在这里插入图片描述][4a556e03da534822bf39cb80171df263.png]  
![在这里插入图片描述][792181aaa504483cac2d54efda698dae.png]

// 处理“当客户端提交请求时没有携带JWT，请求的目标却是需要通过认证的资源”的问题
    http.exceptionHandling().authenticationEntryPoint(new AuthenticationEntryPoint() {
        
        @Override
        public void commence(HttpServletRequest request, HttpServletResponse response, AuthenticationException e) throws IOException, ServletException {
        
            response.setContentType("application/json; charset=utf-8;");
            String message = "未检测到登录信息，请登录！（在开发阶段，看到此提示时，请检查客户端是否携带了有效的JWT数据）";
            log.warn(message);
            JsonResult jsonResult = JsonResult.fail(ServiceCode.ERR_UNAUTHORIZED, message);
            String jsonResultString = JSON.toJSONString(jsonResult);
            PrintWriter writer = response.getWriter();
            writer.println(jsonResultString);
            writer.close();
        }
    });

## 客户端携带JWT提交请求 ##

在客户端，当用户提交登录请求，且服务器端验证登录通过后，会向客户端响应“登录成功”的业务状态码及JWT数据，则客户端需要将此JWT数据保存下来，以便于后续在其它页面中可以取出，并用于提交后续的请求。

![在这里插入图片描述][79524eaa0268485b844cecde73ad6d29.png]

例如，在登录成功后：

![在这里插入图片描述][659cb0b8630349d9992217b1288af667.png]  
![在这里插入图片描述][869910d8d9f0478fa88e58493fb031df.png]

使用axios时，需要调用create()来自定义请求头，此方法将返回一个新的axios对象，例如：

![在这里插入图片描述][0f7e0f4a25324ede992af20af5018147.png]

![在这里插入图片描述][41d446b1f6c64dd992e572c6a662d0d1.png]

## 关于复杂请求的跨域访问 ##

![在这里插入图片描述][770b2342b81246ca8c531c6b59767b50.png]  
![在这里插入图片描述][f8fa698030784c02baadba2e95f97b3e.png]  
![在这里插入图片描述][4dfd3ffef4c74c60bb2f08ad1d3ee551.png]  
![在这里插入图片描述][a8a947d26f0e48afbdfe353488494f95.png]  
![在这里插入图片描述][6cc60b5363784e2bbeb520796334393a.png]

// 此方法会配置Spring Security框架自带的CorsFilter，此过滤器会对OPTIONS请求放行
            http.cors();

![在这里插入图片描述][13f327a25c2e422f96cd4cd37cfc289b.png]

提示：对于复杂请求的预检（提交同一个URL的OPTIONS请求）是客户端的浏览器的自主行为，并不是服务器端的要求，并且，对于同一个URL，如果预检通过，浏览器会缓存“预检通过”这个结果，并且，在后续的访问中，不再执行预检。

### 配置 JSON 工具，将权限改为根据数据库查询出来的，地址： https://editor.csdn.net/md/?articleId=130006898 ###

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