如何根据类错误在jsp中显示消息

Question

here's my Form Class:

public ArrayList<ForbesData> loadData(HttpServletRequest request) throws Exception   {
    ActionErrors errors = new ActionErrors();
     .....
    try {
  ......
 }
catch (NullPointerException e) {
        errors.add("fich", new ActionMessage("error.file.required"));
    }
    catch (IndexOutOfBoundsException e) {
        errors.add("crap", new ActionMessage("error.crapull.required"));
    }
    catch (InvalidFormatException e) {
        errors.add("exc", new ActionMessage("error.excell.required"));
    }

Here's my ApplicationResource.properties:

error.fich.required= folder doesn't exist!
error.crapull.required=folder isn't crapull!
error.excell.required=folder isn't excel!

here's my struts-config:

      <struts-config>
<form-beans>
    <form-bean name="UserForm" type="net.cacib.struts.UserForm" /> 
</form-beans>



<action-mappings>
    <action input="/" name="UserForm" path="/userAction" scope="session" validate="true"
        type="net.cacib.struts.UserAction">
        <forward name="success" path="/index.jsp" />
    </action>



    <action path="/Welcome" forward="/welcomeStruts.jsp" />
</action-mappings>

<message-resources parameter="/WEB-INF/ApplicationResource" />

in my jsp:

 <html:errors property="crap" />
 <html:errors property="fich" />
 <html:errors property="exc" />

what I want to do is display error messages to the user each time an exception is thrown.

Do you have any idea what I need to change my code to achieve this goal. thank you

Answer 1

And what happens now? If it's that you only show one error, it's because you are throwing an exception and have only a single catch block.

If you want to catch all of them and accumulate errors then you need to put a try/catch around each individual chunk of code that can throw the exceptions.