拦截器几种写法

继承HandlerInterceptorAdapter

import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import org.springframework.web.util.WebUtils;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@Component
public class AuthorizationInterceptor extends HandlerInterceptorAdapter {

    private SysUserTokenService sysUserTokenService;

    public AuthorizationInterceptor(SysUserTokenService sysUserTokenService) {
        this.sysUserTokenService = sysUserTokenService;
    }

    public static final String USER_KEY = "userId";
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    if (**request.getMethod().equals(RequestMethod.**OPTIONS**.name())**) {
        response.setHeader("Access-control-Allow-Origin", request.getHeader("Origin"));
        response.setHeader("Access-Control-Allow-Methods", request.getMethod());
        response.setHeader("Access-Control-Allow-Headers", request.getHeader("Access-Control-Request-Headers"));
        response.setStatus(HttpStatus.OK.value());
        return false;
    }
        return true;
    }
}`


import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
@Configuration
public class WebMvcConfig extends WebMvcConfigurerAdapter {

    @Bean
    public WebMvcConfigurer corsConfigurer()
    {
        return new WebMvcConfigurerAdapter() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").
                        allowedOrigins("*"). //允许跨域的域名，可以用*表示允许任何域名使用
                        allowedMethods("*"). //允许任何方法（post、get等）
                        allowedHeaders("*"). //允许任何请求头
                        allowCredentials(true). //带上cookie信息
                        exposedHeaders(HttpHeaders.SET_COOKIE).maxAge(3600L); //maxAge(3600)表明在3600秒内，不需要再发送预检验请求，可以缓存该结果
            }
        };
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 可添加多个
        registry.addInterceptor(new AuthorizationInterceptor(sysUserTokenService)).addPathPatterns("/**");
    }
}



#### Filter

@Component
public class CorsFilter implements Filter {

    @Override
    public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain) throws IOException, ServletException {
        HttpServletResponse httpResponse = (HttpServletResponse) res;
        HttpServletRequest httpRequest = (HttpServletRequest) req;

        httpResponse.setHeader("Access-Control-Allow-Origin", httpRequest.getHeader("Origin"));
        httpResponse.setHeader("Access-Control-Allow-Methods", httpRequest.getMethod());
        httpResponse.setHeader("Access-Control-Max-Age", "3600");
        httpResponse.setHeader("Access-Control-Allow-Headers", httpRequest.getHeader("Access-Control-Request-Headers"));
        chain.doFilter(httpRequest, httpResponse);
    }

    @Override
    public void init(FilterConfig filterConfig) {
    }

    @Override
    public void destroy() {
    }
}

实现WebMvcConfigurer

@Configuration
public class WebMvcConfig implements WebMvcConfigurer {

    @Bean
    public WebMvcConfigurer corsConfigurer()
    {
        return new WebMvcConfigurer() {
            @Override
            public void addCorsMappings(CorsRegistry registry) {
                registry.addMapping("/**").
                        allowedOrigins("*"). //允许跨域的域名，可以用*表示允许任何域名使用
                        allowedMethods("*"). //允许任何方法（post、get等）
                        allowedHeaders("*"). //允许任何请求头
                        allowCredentials(true). //带上cookie信息
                        exposedHeaders(HttpHeaders.SET_COOKIE).maxAge(3600L); //maxAge(3600)表明在3600秒内，不需要再发送预检验请求，可以缓存该结果
            }
        };
    }

    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        // 可添加多个
        registry.addInterceptor(new AuthorizationInterceptor(sysUserTokenService)).addPathPatterns("/**");
    }
}


@Component
public class AuthorizationInterceptor extends HandlerInterceptorAdapter {

    private SysUserTokenService sysUserTokenService;

    public AuthorizationInterceptor(SysUserTokenService sysUserTokenService) {
        this.sysUserTokenService = sysUserTokenService;
    }

    public static final String USER_KEY = "userId";
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
    if (**request.getMethod().equals(RequestMethod.**OPTIONS**.name())**) {
        response.setHeader("Access-control-Allow-Origin", request.getHeader("Origin"));
        response.setHeader("Access-Control-Allow-Methods", request.getMethod());
        response.setHeader("Access-Control-Allow-Headers", request.getHeader("Access-Control-Request-Headers"));
        response.setStatus(HttpStatus.OK.value());
        return false;
    }
        return true;
    }
}