Spring boot in exception handling, a Embeddedservletcontainercustomizer is implemented by default and an error page is defined to "/error". You can see it in the Errormvcautoconfiguration source code.
/**
* {@link Embeddedservletcontainercustomizer} that configures the container ' s error
* pages.
*/
Private Static class Errorpagecustomizer
Implements Embeddedservletcontainercustomizer, Ordered {
Private FinalServerproperties properties;
protected Errorpagecustomizer(Serverproperties properties) {
This. Properties = Properties;
}
@Override
Public void Customize(Configurableembeddedservletcontainer Container) {
Container.adderrorpages (NewErrorPage ( This. Properties.getservletprefix ()
+ This. Properties.geterror (). GetPath ()));
}
@Override
Public int GetOrder() {
return 0;
}
}Also configured a default Whiteboard page, in the source can see
@Configuration
@ConditionalOnProperty(prefix ="Server.error.whitelabel", name ="Enabled", matchifmissing =true)
@Conditional(Errortemplatemissingcondition.class)
protected Static class whitelabelerrorviewconfiguration {
Private FinalSpelview Defaulterrorview =NewSpelview (
"
+"<p>this application have no explicit mapping for/error, so is seeing this as a fallback.</p>"
+"<div id= ' created ' >${timestamp}</div>"
+"<div>there is an unexpected error (Type=${error}, status=${status}) .</div>"
+"<div>${message}</div></body>);
@Bean(name ="Error")
@ConditionalOnMissingBean(name ="Error")
PublicViewDefaulterrorview() {
return This. Defaulterrorview;
}
//If The user adds @EnableWebMvc then the Bean name View Resolver from
//Webmvcautoconfiguration disappears, so add it back in to avoid disappointment.
@Bean
@ConditionalOnMissingBean(Beannameviewresolver.class)
PublicBeannameviewresolverBeannameviewresolver() {
Beannameviewresolver resolver =NewBeannameviewresolver ();
Resolver.setorder (Ordered.lowest_precedence-Ten);
returnResolver
}
}On the processing of the path, a basicerrorcontroller is defined to handle the exception, errorattributes to load the error exception to the front
@Controller
@RequestMapping("${server.error.path:${error.path:/error}}")
Public class basicerrorcontroller extends abstracterrorcontroller {
Private FinalErrorproperties errorproperties;
//...
@RequestMapping(produces ="Text/html")
PublicModelandviewerrorHtml(HttpServletRequest request,
HttpServletResponse response) {
Response.setstatus (GetStatus (Request). value ());
map<string, object> model = geterrorattributes (Request,
Isincludestacktrace (Request, mediatype.text_html));
return NewModelandview ("Error", model);
}
@RequestMapping
@ResponseBody
PublicResponseentity<map<string, object>>Error(HttpServletRequest request) {
map<string, object> BODY = geterrorattributes (Request,
Isincludestacktrace (Request, Mediatype.all));
Httpstatus status = GetStatus (request);
return NewResponseentity<map<string, object>> (body, status);
}
//...}Default as long as you request the Content-type is "text/html" then return a white version page to you, if it is the other content-type, then return a JSON data to you.
If you want to customize the exception, you can handle it in the following ways
1. You can define an exception page by default under Classpath:templates to define a ERROR.FTL freemarker template
<! DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert Title here</title>
</head>
<body>
<H1>Error page!!</H1>
${timestamp?string (' Yyyy-mm-dd HH:mm:ss ')}<br/><br/>
${status}<br/><br/>
${error}<br/><br/>
${message}<br/><br/>
${path}<br/><br/>
</body>
</html>2. You can use @exceptionhandler to intercept exceptions for a particular controller and return a JSON data, but you can also define all of the controllers to intercept exceptions.
@ControllerAdvice(basepackageclasses = foocontroller.class)
Public class foocontrolleradvice extends responseentityexceptionhandler {
@ExceptionHandler(Yourexception.class)
@ResponseBody
Responseentity<?> handlecontrollerexception (httpservletrequest request, throwable ex) {
Httpstatus status = GetStatus (request);
return NewResponseentity<> (NewCustomerrortype (Status.value (), Ex.getmessage ()), status);
}
PrivateHttpstatusGetStatus(HttpServletRequest request) {
Integer statusCode = (integer) request.getattribute ("Javax.servlet.error.status_code");
if(StatusCode = =NULL) {
returnHttpstatus.internal_server_error;
}
returnHttpstatus.valueof (StatusCode);
}
}3. You can also customize the server error page
@Bean
PublicEmbeddedservletcontainercustomizerContainercustomizer(){
return NewMycustomizer ();
}
// ...
Private Static class Mycustomizer implements Embeddedservletcontainercustomizer {
@Override
Public void Customize(Configurableembeddedservletcontainer Container) {
Container.adderrorpages (NewErrorPage (Httpstatus.bad_request,"/500"));
}
}Spring Boot exception handling (GO)
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