SpringMVC拦截器

目录

1、创建拦截器类实现HandlerInterceptor接口

2、在spring-mvc.xml文件中配置拦截器

3、测试拦截器得拦截效果

public class MyInterceptor implements HandlerInterceptor {

    //在目标方法执行之前
    @Override
    public boolean preHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler) throws Exception {
        System.out.println("preHandle");
        return false;
    }

    //在目标方法执行之后，视图对象返回之前
    @Override
    public void postHandle(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, ModelAndView modelAndView) throws Exception {
        System.out.println("postHandle");
    }

    //整个流程执行完毕后
    @Override
    public void afterCompletion(javax.servlet.http.HttpServletRequest request, javax.servlet.http.HttpServletResponse response, Object handler, Exception ex) throws Exception {
        System.out.println("afterCompletion");
    }
}

2、在spring-mvc.xml文件中配置拦截器

3、测试拦截器得拦截效果

@Controller
public class TargetController {

    @RequestMapping("/target")
    public ModelAndView show(){
        System.out.println("目标资源执行。。。");
        ModelAndView modelAndView = new ModelAndView();
        modelAndView.addObject("name","itcast");
        modelAndView.setViewName("index");
        return modelAndView;
    }
}