spring boot: GlobalDefaultExceptionHandler方法内的友好错误提示,全局异常捕获

spring boot: GlobalDefaultExceptionHandler方法内的友好错误提示,全局异常捕获

当你的某个控制器内的某个方法报错，基本上回显示出java错误代码，非常不友好，这个时候可以通过新建GlobalDefaultExceptionHandler.java文件,

1.加上@ControllerAdvice注解, 

2. 然后复写defaultExceptionHandler方法，在方法上添加@ResponseBody输出注解, 

  以及@ExceptionHandler(Exception.class)注解，就能友好的已文字的信息显示错误信息l

package com.muyang.boot22.config;

import javax.servlet.http.HttpServletRequest;

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

@ControllerAdvice
public class GlobalDefaultExceptionHandler {
	
	
	
	@ExceptionHandler(Exception.class)
	@ResponseBody
	public String defaultExceptionHandler(HttpServletRequest req,Exception e){
		//是返回的String.
		
		//ModelAndView -- 介绍 模板引擎...?
//		ModelAndView mv = new ModelAndView();
//		mv.setViewName(viewName);
		
		return "对不起，服务器繁忙，请稍后再试！";
	}
	
}

　　

参考项目：

 

 

pom.xml参考代码

 
  
  	org.springframework.boot
  	spring-boot-starter-parent
  	1.5.9.RELEASE
  

  
    UTF-8
    1.8
  

  
  
  
  
  
  	org.springframework.boot
  	spring-boot-starter-web
  
  
  
  
  
  	javax.servlet
  	jstl
  
  
  
  
  	org.springframework.boot
  	spring-boot-starter-tomcat
  	provided
  
  
  	org.apache.tomcat.embed
  	tomcat-embed-jasper
  	provided
  
  
  
  
    
      junit
      junit
      3.8.1
      test
    
    
    
      
    
			com.alibaba
			fastjson
			1.2.15
		
    
    
    
    	org.springframework.boot
    	spring-boot-devtools
    	true
    	true
    
    
  
  
  
  	
  	
  		
  		
  			org.springframework.boot
  			spring-boot-maven-plugin
  			
  				
  				true
  			
  		
  		
  	
  

　　

 

App.java参考代码

package com.muyang.boot22;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.web.HttpMessageConverters;
import org.springframework.context.annotation.Bean;
import org.springframework.http.converter.HttpMessageConverter;

import com.alibaba.fastjson.serializer.SerializerFeature;
import com.alibaba.fastjson.support.config.FastJsonConfig;
import com.alibaba.fastjson.support.spring.FastJsonHttpMessageConverter;

/**
 * Hello world!
 *
 */
@SpringBootApplication
public class App 
{
	
	//fastJson配置
	@Bean
	public HttpMessageConverters fastJsonHttpMessageConverters()
	{
		
		FastJsonHttpMessageConverter fastConverter = new FastJsonHttpMessageConverter();
		
		FastJsonConfig fastJsonConfig = new FastJsonConfig();
		fastJsonConfig.setSerializerFeatures(SerializerFeature.PrettyFormat);
		
		fastConverter.setFastJsonConfig(fastJsonConfig);
		
		HttpMessageConverter converter = fastConverter;
		return new HttpMessageConverters(converter);
	
	}
	
    public static void main( String[] args )
    {
        //System.out.println( "Hello World!" );
    	SpringApplication.run(App.class, args);
    }
}

　　

 

HelloController.java样例

package com.muyang.boot22.controller;

import java.util.Map;

import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

@Controller
public class HelloController 
{

	@RequestMapping("/hello")
	public void index(Mapmap)
	{
		//map.put("name", "张三");
		//return "hello";
		int i = 1024/0;
	}
	
}

　　

运行App.java

访问 http://localhost:8080/hello时，报错。能友好提示