spring boot 学习--03---web控制层全局异常处理

全局Controller异常

1. 新建全局异常处理类

里面涉及到 @ControllerAdvice ，其实就是一个切面注解，controller层切面

package com.springboot.study.exception.handler;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.springframework.web.bind.annotation.ControllerAdvice;import org.springframework.web.bind.annotation.ExceptionHandler;/** * ControllerAdvice  控制层的切面 * @author like * */@ControllerAdvicepublic class GlobalDefaultExceptionHandler {    @ExceptionHandler(value = Exception.class)    public void defaultErrorHandler(HttpServletRequest req, HttpServletResponse response ,Exception e)  {        e.printStackTrace();        response.setCharacterEncoding("UTF-8");        try {            response.getWriter().write(e.toString());        } catch (IOException e1) {            e1.printStackTrace();        }    }}

2. 新增异常方法

package com.springboot.study.controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RestController;import com.springboot.study.bean.Demo;/** * Demo 控制类 * @author like * */@RestController@RequestMapping("/demo")public class DemoController {    @RequestMapping("/getDemo")    public Demo getDemo(){        Demo demo = new Demo();        demo.setId(1);        demo.setDemo("demo");        demo.setName("testDemo");        return demo;    }    @RequestMapping("/zero")    public int zeroException(){       return 100/0;    }}

3. 测试

1.访问 http://localhost:8080/demo/zero
2.结果

3.在web界面已经捕获了错误，可以自定义错误错误码