JWT跨域认证

新建shop项目

新建bean包，再其包下新建User

 

package com.example.shop.bean;
 
public class User {
    private String username;
    private String password;
    // 可以根据需要添加其他字段，比如角色、邮箱等
 
    public String getUsername() {
        return username;
    }
 
    public void setUsername(String username) {
        this.username = username;
    }
 
    public String getPassword() {
        return password;
    }
 
    public void setPassword(String password) {
        this.password = password;
    }
 
    // 可以根据需要添加其他的 getter 和 setter 方法
 
    @Override
    public String toString() {
        return "User{" +
                "username='" + username + '\'' +
                ", password='" + password + '\'' +
                '}';
    }
}

新建utils包，再其包下新建JwtUtils，Result和ResultCode

 ResultCode代码如下

package com.example.shop.utils;
 
public interface ResultCode {
    public static Integer SUCCESS= 20000;//成功
    public static Integer ERROR=20001;//失败
}

Result代码如下

package com.example.shop.utils;
 
import java.util.HashMap;
import java.util.Map;
 
public class Result {
    private Boolean success;
    private Integer code;
    private String message;
    private Map<String, Object> data = new HashMap<>();
 
    // 私有构造方法
    private Result() {}
 
    // 成功静态方法
    public static Result ok() {
        Result r = new Result();
        r.setSuccess(true);
        r.setCode(ResultCode.SUCCESS);
        r.setMessage("成功");
        return r;
    }
 
    // 失败静态方法
    public static Result error() {
        Result r = new Result();
        r.setSuccess(false);
        r.setCode(ResultCode.ERROR);
        r.setMessage("失败");
        return r;
    }
 
    public Boolean getSuccess() {
        return success;
    }
 
    public void setSuccess(Boolean success) {
        this.success = success;
    }
 
    public Integer getCode() {
        return code;
    }
 
    public void setCode(Integer code) {
        this.code = code;
    }
 
    public String getMessage() {
        return message;
    }
 
    public void setMessage(String message) {
        this.message = message;
    }
 
    public Map<String, Object> getData() {
        return data;
    }
 
    public void setData(Map<String, Object> data) {
        this.data = data;
    }
 
    public Result success(Boolean success) {
        this.setSuccess(success);
        return this;
    }
 
    public Result message(String message) {
        this.setMessage(message);
        return this;
    }
 
    public Result code(Integer code) {
        this.setCode(code);
        return this;
    }
 
    public Result data(String key, Object value) {
        this.data.put(key, value);
        return this;
    }
 
    public Result data(Map<String, Object> map) {
        this.setData(map);
        return this;
    }
}

 JwtUtils代码如下

package com.example.shop.utils;
 
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jwts;
import io.jsonwebtoken.SignatureAlgorithm;
 
import java.util.Date;
 
public class JwtUtils {
    // 7天过期，单位秒
    private static final long expire = 604800;
    // 32位秘钥
    private static final String secret = "abcdfghiabcdfghiabcdfghiabcdfghi";
 
    // 生成token
    public static String generateToken(String username) {
        Date now = new Date();
        Date expiration = new Date(now.getTime() + 1000 * expire);
        return Jwts.builder()
                .setHeaderParam("typ", "JWT") // 设置头部信息
                .setSubject(username) // 设置主题
                .setIssuedAt(now) // 设置签发时间
                .setExpiration(expiration) // 设置过期时间
                .signWith(SignatureAlgorithm.HS512, secret) // 设置签名使用的算法和秘钥
                .compact(); // 生成token
    }
 
    // 解析token，获取Claims
    public static Claims getClaimsByToken(String token){
        return Jwts.parser()
                .setSigningKey(secret) // 设置秘钥
                .parseClaimsJws(token) // 解析token
                .getBody(); // 获取token中的payload部分
    }
}

 新建controller包，，在其下新建UserController

 UserController代码如下

package com.example.shop.controller;
 
import org.springframework.web.bind.annotation.*;
import com.example.shop.utils.Result;
import com.example.shop.utils.JwtUtils;
import com.example.shop.bean.User;
 
@RestController
@RequestMapping("/user")
@CrossOrigin
public class UserController {
 
    @PostMapping("/login")
    public Result login(@RequestBody User user) {
        String token = JwtUtils.generateToken(user.getUsername());
        return Result.ok().data("token", token);
    }
 
    @GetMapping("/info")
    public Result info(@RequestParam String token) {
        String username = JwtUtils.getClaimsByToken(token).getSubject();
        String url = "https://img2.baidu.com/it/u=1325995315,4158780794&fm=26&fmt=auto&gp=0.ipg";
        return Result.ok().data("name", username).data("avatar", url);
    }
 
    @PostMapping("/logout")
    public Result logout() {
        return Result.ok();
    }
}

添加依赖

 

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

 运行localhost/user/login

输入和结果如下