This article will springmvc exception handling.

1, environmental constraints

win10 64-bit operating system
idea2018.1.5
jdk-8u162-windows-x64
spring4.2.4

2, the premise of restraint

Complete annotation-based demo springmvc of https://www.jianshu.com/p/d1a84f07c98f

3, steps

1. ExceptionHandler

Create a net.wanho.controller.ExceptionController.java in the src folder file, as follows:

@Controller
public class ExceptionController{
    @ExceptionHandler(value = ArithmeticException.class)
    public String test1excp()
    {
        System.out.println(this);
        return "arithmetic";
    }
    @RequestMapping("/exception1")
    @ResponseBody
    public String exception1()
    {  
        System.out.println(1/0)
        return "exception1";
    }
}

In the WEB-INF / page / folder, create a arithmetic.jsp file, as follows:

<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    数学异常界面
</body>
</html>

Start tomcat, enter in the browser http: // localhost: 8080 / exception1 , carriage returns, we will see a jump to the page arithmetic.jsp exception handling
Note: This approach is an exception for this Controller class where the ExceptionHandler .

2. Use SimpleMappingExceptionResolver

In the spring-mvc.xml tag was added to exception handling, as follows:

    <bean id="simpleMappingExceptionResolver" class=
            "org.springframework.web.servlet.handler.SimpleMappingExceptionResolver">
        <property name="exceptionMappings">
            <map>
                <!-- key:异常类别（非全称), 视图名称 -->
                <entry key="ArithmeticException" value="arithmetic"/>
            </map>
        </property>
        <!-- 如果在以上配置中找不到异常，则进入此默认异常 -->
        <property name="defaultErrorView" value="error"/>
    </bean>

Error.jsp join in the WEB-INF / page / folder error handling page.
Note: This approach is an exception for all Controller thrown exception.

Configuration error-page

error-page depending on the return code is the ultimate way to handle exceptions.

Add the following configuration in web.xml:

    <error-page>
        <error-code>404</error-code>
        <location>/404.jsp</location>
    </error-page>
    <error-page>
        <error-code>500</error-code>
        <location>/500.jsp</location>
    </error-page>

In the WEB-INF / page / folder added 404.jsp and 500.jsp
more than three ways to handle exceptions and errors is a common way to avoid the embarrassment of our program handles errors and exceptions.

05 handle exceptions

1, environmental constraints

2, the premise of restraint

3, steps

1. ExceptionHandler

2. Use SimpleMappingExceptionResolver

Configuration error-page

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