How to display a custom 404 Not Found page using Spring MVC

The content of this article is about how to use Spring MVC to display a customized 404 Not Found page. It has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

I wonder if you are tired of the same 404 Not Found error page? In fact, through very simple configuration, Spring MVC can display your customized 404 Not Found error page.

Add a new area in web.xml of WEB-INF:

means that once a 404 error occurs , display the 404.jsp page under the resources folder.

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

Now feel free to develop your own personalized 404 error page.

## After that, randomly access a non-existent url, deliberately causing 404 error, you can see the custom 404 Not Found page we just configured.

If you want to implement a general exception handling logic (Exception handler) in Spring MVC, which can catch all types of exceptions, for example, through the following For exceptions thrown in this way, you can follow the steps described below.

1. Create a new class that inherits from SimpleMappingExceptionResolver:

public class GlobalDefaultExceptionHandler extends
SimpleMappingExceptionResolver {
public GlobalDefaultExceptionHandler(){
System.out.println("GlobalDefaultExceptionHandler constructor called!");
}
@Override
public String buildLogMessage(Exception ex, HttpServletRequest request) {
System.out.println("Exception caught by Jerry");
ex.printStackTrace();
return "Spring MVC exception: " + ex.getLocalizedMessage();
}

2. In the Servlet configuration file of Spring MVC, add The class just created is configured as a Bean:

#The ID of the Bean is set to simpleMappingExceptionResolver, and the class is set to the namespace of the class created in step 1. full name. Create a property named defaultErrorView, whose value is generic_error, pointing to a JSP view: generic_error.jsp.

<bean>
<property>
<map>
<entry></entry>
</map>
</property>
<property></property>
</bean>

Source code of generic_error.jsp:

nbsp;html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">


<meta>
<title>Generic Error Page of Jerry</title>


<h2>Unknown Error Occured, please contact Wang, Jerry.</h2>

Now you can test it. I previously threw an exception through the following statement:

throw new Exception("Generic Exception raised by Jerry");

This exception was successfully caught by the exception handling class I implemented myself, and my customized exception display page was displayed:

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