spring boot 學習--03---web控制層全局異常處理

全局Controller異常

1. 新建全局異常處理類

裏面涉及到 @ControllerAdvice ，其實就是一個切面註解，controller層切面

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  控制層的切面
 * @author like
 *
 */
@ControllerAdvice
public 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. 新增異常方法

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 控制類
 * @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. 測試

1.訪問 http://localhost:8080/demo/zero
2.結果

3.在web界面已經捕獲了錯誤，可以自定義錯誤錯誤碼