spring boot攔截器的實現

1、建立攔截器

　　建立攔截器，實現HandlerInterceptor介面即可

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

import org.springframework.web.servlet.HandlerInterceptor;
import org.springframework.web.servlet.ModelAndView;

public class MyInterceptor implements
 
 HandlerInterceptor{

    @Autowired
    private BeanService service ;
    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
            throws Exception {
        // TODO Auto-generated method stub
        return false;
    }

    @Override
 

    public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
                           ModelAndView modelAndView)
            throws Exception {
        // TODO Auto-generated method stub

    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
            throws
 
 Exception {
        // TODO Auto-generated method stub

    }

}

2、註冊攔截器

　　註冊攔截器的實現

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



@Configuration
@EnableWebMvc
public class MyWebMvcConfigurerAdapter extends WebMvcConfigurerAdapter {

    @Bean
    MyInterceptor  myInterceptor(){
        return new MyInterceptor();
    }
    @Override
    public void addInterceptors(InterceptorRegistry registry) {
        registry.addInterceptor(myInterceptor()).addPathPatterns("/*");
        super.addInterceptors(registry);
        super.addInterceptors(registry);
    }
}

問題解析

1、bean載入的問題
　　在攔截器中注入bean。然後在註冊攔截器的時候直接new或者是注入資料的時候會出現攔截器中的bean註冊失敗的問題，解決方案如MyWebMvcConfigurerAdapter程式碼片。新增一個方法去做攔截器載入，在方法上使用@bean去進行bean的載入管理即可