springboot全局异常处理实例——@ControllerAdvice+ExceptionHandler

一、全局捕获异常后，返回json给浏览器

项目结构：

1、自定义异常类 MyException.java

package com.gui.restful;

/**
 * 自定义异常类
 */
public class MyException extends RuntimeException{
    private String code;
    private String msg;
    public MyException(String code,String msg){
        this.code=code;
        this.msg=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;
    }
}

2、控制器 MyController.java

package com.gui.restful;

import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

/**
 * controller抛出异常
 */
@RestController
public class MyController {

    @RequestMapping("hello")
    public String hello() throws Exception{
        throw new MyException("101","系统异常");
    }

}

3、全局异常处理类 MyControllerAdvice

package com.gui.restful;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.HashMap;
import java.util.Map;

/**
 * 全局异常捕获处理
 */
@ControllerAdvice //controller增强器
public class MyControllerAdvice {

    @ResponseBody
    @ExceptionHandler(value=MyException.class) //处理的异常类型
    public Map myExceptionHandler(MyException e){
        Map map=new HashMap<>();
        map.put("code",e.getCode());
        map.put("msg",e.getMsg());
        return map;
    }

}

4、运行结果

启动应用，访问 http://localhost:8080/hello，出现以下结果，说明自定义异常被成功拦截

二、全局捕获异常后，返回页面给浏览器

1、自定义异常类 MyException.java（同上）

2、控制器 MyController.java（同上）

3、全局异常处理类 MyControllerAdvice

package com.gui.restful;

import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;

import java.util.HashMap;
import java.util.Map;

/**
 * 全局异常捕获处理
 */
@ControllerAdvice //controller增强器
public class MyControllerAdvice {

    @ExceptionHandler(value=MyException.class) //处理的异常类型
    public ModelAndView myExceptionHandler(MyException e){
        ModelAndView modelAndView=new ModelAndView();
        modelAndView.setViewName("error");
        modelAndView.addObject("code",e.getCode());
        modelAndView.addObject("msg",e.getMsg());
        return modelAndView;
    }

}

4、页面渲染 error.ftl（用freemarker渲染）

pom.xml中引入freemarker依赖

		
			org.springframework.boot
			spring-boot-starter-freemarker
		

error.ftl

    


code:${code}
msg:${msg}

5、运行结果

启动应用，访问 http://localhost:8080/hello，出现以下结果，说明自定义异常被成功拦截