JAVA高级面试进阶训练营视频教程

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服务端异常讲解和SpringBoot配置全局异常实战

注解介绍：

@ControllerAdvice 如果是返回json数据，则用RestControllerAdvice,就可以不加@ResponseBody

捕获全局异常,处理所有不可知的异常
@ExceptionHandler(value=Exception.class)

Controller代码：

package net.nbclass.demo.controller;

import net.nbclass.demo.Module.ExecptionData;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 异常测试
 * Created by 5407 on 2018/9/25.
 */
@RestController
public class ExecptionController {

    @RequestMapping("/ext")
    public String test(){
        int i=1/0;   --异常触发
        return "Hello";
    }
}

异常处理类：

package net.nbclass.demo.Handler;

import net.nbclass.demo.Module.ExecptionData;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by 5407 on 2018/9/25.
 */
@RestControllerAdvice
public class CustomExtHandler {

    @ExceptionHandler(value = Exception.class)
    Object handleException(Exception e, HttpServletRequest request){
        Map<String,Object> map=new HashMap<>();
        map.put("code",100);
        map.put("msg",e.getMessage());
        map.put("url",request.getRequestURL());
        return map;
    }
}

 

 

 

服务端异常讲解和SpringBoot配置自定义异常实战

和全局异常区别不大，只是多了一点：

新建自定义异常类，需要继承基类【RuntimeException】：

package net.nbclass.demo.Module;

/**
 * 自定义异常类
 * Created by 5407 on 2018/9/25.
 */
public class ExecptionData extends RuntimeException{

    public ExecptionData(String code,String msg){
        this.code=code;
        this.msg=msg;
    }

    private String code;
    private String msg;

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }
}

捕获异常并处理：

package net.nbclass.demo.Handler;

import net.nbclass.demo.Module.ExecptionData;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;

import javax.servlet.http.HttpServletRequest;
import java.util.HashMap;
import java.util.Map;

/**
 * Created by 5407 on 2018/9/25.
 */
@RestControllerAdvice
public class CustomExtHandler {

    @ExceptionHandler(value = Exception.class)
    Object handleException(Exception e, HttpServletRequest request){
        Map<String,Object> map=new HashMap<>();
        map.put("code",100);
        map.put("msg",e.getMessage());
        map.put("url",request.getRequestURL());
        return map;
    }

    @ExceptionHandler(value = ExecptionData.class)
    Object ExecptionData(ExecptionData e, HttpServletRequest request){
        
        Map<String,Object> map=new HashMap<>();
        map.put("code",11);
        map.put("msg",e.getMessage());
        map.put("url",request.getRequestURL());
        return map;
       

        //结合thymeleaf模板引擎实现页面跳转
        //ModelAndView modelAndView = new ModelAndView();
        //modelAndView.setViewName("index");
        //modelAndView.addObject("msg", e.getMessage());
        //return modelAndView;

     } 

}

Controller类触发异常：

package net.nbclass.demo.controller;

import net.nbclass.demo.Module.ExecptionData;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * 异常测试
 * Created by 5407 on 2018/9/25.
 */
@RestController
public class ExecptionController {

    @RequestMapping("/ext")
    public String test(){
        int i=1/0;
        return "Hello";
    }

    @RequestMapping("/ext1")
    public Object test1(){
        throw new ExecptionData("101","error");
    }
}

结果：

{"msg":null,"code":11,"url":"http://localhost:8080/ext1"}

返回页面：

 

附上目录结构：