Spring Boot入门——全局异常处理

1、后台处理异常

　　a、引入thymeleaf依赖

    <!-- thymeleaf模板插件 -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-thymeleaf</artifactId>
    </dependency>

　　b、在application.properties文件中设置属性

#关闭thymeleaf模板的缓存
spring.thymeleaf.cache=false

　　c、编写后台处理Handler　　

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

@ControllerAdvice
public class GlobalExceptionHandler {

　　//设置此handler处理所有异常
    @ExceptionHandler(value=Exception.class)
    public void defaultErrorHandler(){
        System.out.println("-------------default error");
    }
}

　　d、后台异常打印

-------------default error
2017-06-16 14:54:05.314  WARN 6892 --- [nio-8080-exec-1] .m.m.a.ExceptionHandlerExceptionResolver : Resolved exception caused by Handler execution: org.springframework.dao.IncorrectResultSizeDataAccessException: result returns more than one elements; nested exception is javax.persistence.NonUniqueResultException: result returns more than one elements

2、页面处理异常

　　a、修改Handler

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

@ControllerAdvice
public class GlobalExceptionHandler {

    @ExceptionHandler(value=Exception.class)
    @ResponseBody
    public String defaultErrorHandler(){
        System.out.println("-------------default error");
        return "系统错误，请联系管理员";
    }
}

　　b、页面访问结果

3、页面处理异常，使用模板页面

　　a、编写html模板页面

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org"  
      xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3">
<head>
<meta charset="UTF-8" />
<title>Insert title here</title>
</head>
<body>
    <h1 th:inlines="text">异常出现啦</h1>
    <p th:text="${messages}"></p>
</body>
</html>

　　b、修改Handler

　　@ExceptionHandler(value=Exception.class)
    public ModelAndView defaultErrorHandler(Exception e){
        ModelAndView modal = new ModelAndView();
        modal.setViewName("/exception");
        modal.addObject("messages", e.getMessage());
        return modal;
    }

　　c、测试结果