SpringBoot异常处理-拓冰建站

1.自定义错误界面

SpringBoot默认的处理异常的机制：SpringBoot 默认的已经提供了一套处理异常的机制。一旦程序中出现了异常 SpringBoot 会向/error 的 url 发送请求。在 springBoot 中提供了一个叫 BasicErrorController 来处理/error 请求，然后跳转到默认显示异常的页面来展示异常信息

如果我们需要将所有的异常同一跳转到自定义的错误页面，需要再src/main/resources/

templates 目录下创建 error.html 页面。注意：名称必须叫 error

1.1controller

/*** SpringBoot处理异常方式一：自定义错误页面*/
@Controller
public class DemoController {@RequestMapping("/show")public String showInfo(){String str = null;str.length();return "index";}@RequestMapping("/show2")public String showInfo2(){int a = 10/0;return "index";}
}

1.2错误页面

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>错误提示页面</title>
</head>
<body>出错了，请与管理员联系。。。<span th:text="${error}"></span>
</body>
</html>

2.整合web访问全局异常处理器

2.1处理思路

2.2创建全局异常处理器

package com.zhy.exception;import org.springframework.stereotype.Component;
import org.springframework.web.servlet.HandlerExceptionResolver;
import org.springframework.web.servlet.ModelAndView;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;/*** 通过实现HandlerExceptionResolver接口做全局异常处理*/
//@Component
public class GloableException implements HandlerExceptionResolver {@Overridepublic ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {ModelAndView mv = new ModelAndView();if (e instanceof NullPointerException){mv.setViewName("error1");}else if (e instanceof ArithmeticException){mv.setViewName("error2");}mv.addObject("msg",e.toString());return mv;}
}

2.3错误页面

error1.html

<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><title>错误提示页面-ArithmeticException</title>
</head>
<body>
<h2>error 1</h2>
出错了，请与管理员联系。。。
<span th:text="${msg}"></span>
</body>
</html>

error2.html

<!DOCTYPE html>
<html>
<head><meta charset="UTF-8"><title>错误提示页面-NullPointerException</title>
</head>
<body>
出错了，请与管理员联系。。。
<span th:text="${msg}"></span>
</body>
</html>

3.整合ajax全局异常处理

3.1创建全局异常处理器

package com.zhy.exception;import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;import java.util.HashMap;
import java.util.Map;@ControllerAdvice
public class JunitException {@ResponseBody@ExceptionHandlerpublic Map junitException(Exception e){Map<String, Object> map = new HashMap<>();map.put("status",500);map.put("msg",e.toString());return map;}
}

4.总结

一、非ajax
public class GloableExceptionHandler implements HandlerExceptionResolver {
@Override
public ModelAndView resolveException(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) {
ModelAndView mv = new ModelAndView();
if(e instanceof NullPointerException){
mv.setViewName("error1");
}else if(e instanceof ArithmeticException){
mv.setViewName("error2");
}
mv.addObject("msg", e.toString());
return mv;
}
}
二、ajax
@ControllerAdvice
public class AjaxGlobalExceptionHandler {

@ResponseBody
@ExceptionHandler
public Map errorHandler(Exception e){
Map<String, Object> map = new HashMap<>();
map.put("status", 500);
map.put("msg", e.toString());
return map;//{status:500, msg:异常信息}
}
}