spring boot使用HandlerInterceptorAdapter+WebMvcConfigurerAdapter攔截

  最近在做考試系統，是個微信小程序，頁面都是前端那里做好的，數據都是調的后端接口，自然后端就使用到了攔截器。時間有點緊，這篇只是大概寫個結構，以后再補。

1.HandlerInterceptorAdapter

preHandle 業務處理器在處理業務之前被調用，預處理。

postHandle 在業務處理之后調用，后處理，

afterCompletion 在DispatcherServlet完全處理完請求后被調用，可用於清理資源。也可以根據ex是否為null來判斷是否發生了異常。

import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


/**
 * @author suwan
 */
public class LoginInterceptor extends HandlerInterceptorAdapter {
    @Override
        public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
            String url = request.getRequestURI().toString();
            System.out.println("preHandle:" + url);
        return true;
    }

    @Override
    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        String url = request.getRequestURI().toString();
        System.out.println("postHandle:" + url);
        super.postHandle(request, response, handler, modelAndView);
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion:" + ex);
        super.afterCompletion(request, response, handler, ex);
    }
}

 

2.WebMvcConfigurerAdapter添加攔截器

  addInterceptors 需要一個實現HandlerInterceptor接口的攔截器實例

 addPathPatterns 用於設置攔截器的過濾路徑規則

 excludePathPatterns：用於設置不需要攔截的過濾規則

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;

/**
 * @author suwan
 */
@Configuration
    public class InterceptorConfig extends WebMvcConfigurerAdapter {
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(loginInterceptor()).addPathPatterns("/login/**").excludePathPatterns("/hello/**");
    }
    @Bean
    public LoginInterceptor loginInterceptor(){return new LoginInterceptor();}
}

3.測試設置攔截器的路徑

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author suwan
 */
@RestController
@RequestMapping("/login")
public class UserController {

    @GetMapping("/test")
    public void test(){
        System.out.println("loginTest");
    }
}

瀏覽器請求：http://localhost:8080/login/test

輸出：
preHandle:/login/test
loginTest
postHandle:/login/test
afterCompletion:null

4.測試未設置攔截的路徑

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * @author suwan
 * @date 2019/6/13
 */
@RestController
@RequestMapping("/hello")
public class HelloController {
    @GetMapping("/test")
    public  void  test(){
        System.out.println("helloTest");
    }
}

瀏覽器請求：http://localhost:8080/hello/test

輸出：
helloTest