springMVC中多个拦截器Interceptor的执行顺序

最新推荐文章于 2024-07-16 15:45:16 发布

原创最新推荐文章于 2024-07-16 15:45:16 发布 · 4.3k 阅读

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本文详细解析了Spring MVC框架中拦截器的工作流程，包括MyInteceptor1和MyInteceptor2两个自定义拦截器的实现。阐述了preHandle、postHandle及afterCompletion三个核心方法的调用顺序，强调了它们在请求处理过程中的不同作用。

拦截器1

public class MyInteceptor1 implements HandlerInterceptor{

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
// TODO Auto-generated method stub
System.out.println("方法前1");
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// TODO Auto-generated method stub
System.out.println("方法后1");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
System.out.println("页面渲染后1");
}

}

拦截器2

public class MyInteceptor2 implements HandlerInterceptor{

@Override
public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler)
throws Exception {
// TODO Auto-generated method stub
System.out.println("方法前2");
return true;
}

@Override
public void postHandle(HttpServletRequest request, HttpServletResponse response, Object handler,
ModelAndView modelAndView) throws Exception {
// TODO Auto-generated method stub
System.out.println("方法后2");
}

@Override
public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex)
throws Exception {
// TODO Auto-generated method stub
System.out.println("页面渲染后2");
}

}

执行结果：

总结一下：

preHandle按拦截器定义顺序地调用

postHandle按拦截器定义逆序地调用

afterCompletion按拦截器定义逆序地调用

postHandle在截器链内所有拦截器返回成功调用

afterCompletion只有在preHandle返回true才调用

springMVC中多个拦截器Interceptor的执行顺序

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