springboot整合jwt生成token

1、引入jwt的两个依赖
java-jwt,jjwt
<dependency>
<groupId>com.auth0</groupId>
<artifactId>java-jwt</artifactId>
<version>3.19.2</version>
</dependency>
<dependency>
<groupId>io.jsonwebtoken</groupId>
<artifactId>jjwt</artifactId>
<version>0.9.1</version>
</dependency>
2、使用jwt创建token，并响应给前端

           HashMap<String, Object> map = new HashMap<>();
            map.put("username",user.getUsername());
            JwtBuilder builder = Jwts.builder();
            String token = builder.setIssuedAt(new Date())
                    .setExpiration(new Date(System.currentTimeMillis() + 1000 + 60 * 60 * 24))
                    .signWith(SignatureAlgorithm.HS256, "yogo123456")
                    .setId(user.getUserId() + "")
                    .setClaims(map)
                    .compact();
            return new ResultVO(ResultVOCode.SUCCESS,token,user);

3、创建拦截器，拦截前端token
1、前端token约定添加到header中，需要预检（OPTIONS）
@Component
public class CheckTokenIncepter implements HandlerInterceptor {

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {

    //放行预检
    String method = request.getMethod();
    if ("OPTIONS".equalsIgnoreCase(method)){
        return true;
    }
    ResultVO resultVO = new ResultVO();
    String token = request.getHeader("token");

// String token = request.getParameter("token");

    if (token == null || token.length() == 0){
        resultVO.setCode(ResultVOCode.FAILER);
        resultVO.setMsg("请先登录");
        doResponse(response,resultVO);
    }else {
        JwtParser parser = Jwts.parser();
        parser.setSigningKey(ConstContent.tokenPwd);
        try {

            Jws<Claims> claimsJws = parser.parseClaimsJws(token);

// Claims body = claimsJws.getBody();
// String tokenParam1 = body.get(ConstContent.tokenParam1, String.class);
// System.out.println("tokenParam1------"+tokenParam1);
return true;
}catch (Exception e){
resultVO.setCode(ResultVOCode.FAILER);
resultVO.setMsg("token失效 请先登录");
doResponse(response,resultVO);
}
}
return false;
}

private void doResponse(HttpServletResponse response, ResultVO resultVO){
    response.setContentType("application/json");
    response.setCharacterEncoding("utf-8");
    try {
        PrintWriter writer = response.getWriter();
        String str = new ObjectMapper().writeValueAsString(resultVO);
        writer.print(str);
        writer.flush();
        writer.close();
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}

}
@Configuration
public class InterceptorConfig implements WebMvcConfigurer {

@Autowired
private CheckTokenIncepter checkTokenIncepter;

@Override
public void addInterceptors(InterceptorRegistry registry) {
    registry.addInterceptor(checkTokenIncepter)
            .addPathPatterns("/goods/**")
            .addPathPatterns("/shopCart/**")
            .excludePathPatterns("/user/**");
}

}