SPRINGMVC system exception handling and self-defined exception handling

Configuring the system exception handler

1. Background simulation of an exception

@RequestMapping (value = "/myexception.do", produces = "Text/html;charset=utf-8")    public  String myexception () {        int a=5/0;         return "/error.jsp";    }

2. When the system exception is not configured, the foreground access error 500, after configuring the system exception processor successfully entered the wrong page

<Bean        class= "Org.springframework.web.servlet.handler.SimpleMappingExceptionResolver" >        <property name= "Defaulterrorview" value= "error.jsp" ></property>        <property name= " Exceptionattribute "Value=" ex "></property>    </bean>

3. Front Page

Error page ${ex.message}

:

Configuring custom Exception Handlers

1. Create a custom exception class

 public  class  myexception extends   exception{  Public   MyException () { super   ();  public   MyException (String message) {    /span>super   (message); }}

 public  class  nameexception extends   myexception { public   Nameexception () { super   ();         public   nameexception (String message) {     super   (message); }}

 Public class extends myexception {    public  ageexception () {        Super();    }      Public ageexception (String message) {        Super(message);}    }

2. Configuring the Processor method

 @RequestMapping (value = "/exception.do", produces = "Text/html;charset=utf-8" public  string Exception (string name, Integer age) throws   Nameexception, ageexception { if  (!name.eq Uals ("admin"  throw  new  nameexception (" User name error " if  (age > 40 
       
        throw 
        new  ageexception ("Too old" );     return  "/result.jsp" ; }

3. Configure Applicationcontext.xml

<!--registering the system exception handler--    <Bean        class= " Org.springframework.web.servlet.handler.SimpleMappingExceptionResolver ">        <property name=" Defaulterrorview "value=" error.jsp "></property>        <property name=" Exceptionattribute "value=" ex "/ >        <!--Custom exception handling--        <property name= "exceptionmappings" >            <props>                <prop key= " Cn.cnsdhzzl.exception.NameException ">/customError/userNameError.jsp</prop>                <prop key=" Cn.cnsdhzzl.exception.AgeException ">/customError/userAgeeError.jsp</prop>            </props>        </property>    </bean>

The configuration is completed, and then the exception is entered in the corresponding error page

SPRINGMVC system exception handling and self-defined exception handling