在Struts中使用异常

在Struts中使用异常
1 、自定义用户异常
public class MyException extends Exception {
???? ?private String code;

????? public MyException() {
??????????? super();
????? }

??????public MyException(String code) {
??????????? this.code = code;
??????}

????? public String getCode() {
????????????return code;
????? }

????? public void setCode(String code) {
????????????this.code = code;
????? }
}

2、 在相应的业务方法中抛出异常
public boolean isExistMember(String memberCode)throws MyException{
??????List list=(List)baseDAO.getByProperty("TMember","memberCode",memberCode);
??????if(list.size()>0){
??????????? throw new MyException("Error_001");?
????? }else{
??????????? return false;
????? }
}
3 在Action中作出相应的页面跳转
public ActionForward execute(ActionMapping mapping, ActionForm form,HttpServletRequest request, HttpServletResponse response) {
?????? AddMemberForm addMemberForm = (AddMemberForm) form??
????? try{????
??????????? if(!memberManager.isExistMember(addMemberForm.getMemberCode())){??
????????????????? memberManager.addMember(addMemberForm);
??????????? }
??????}catch(MyException ee){
?????????? request.setAttribute("code",ee.getCode());
?????????? return mapping.findForward("error");?
????? }catch(Exception e){
?????????? e.printStackTrace();
????? }
????? return mapping.findForward("success");
?}

*其中"error","success"要先在对应的Action中配置好,内容如下
????? name="addMemberForm"
????? path="/addMember"
????? scope="request">?????

4、首先定义好Struts中常用的标签文件,把这些标签统一放到一个jsp文件中方便在其它页面使用标签时可以直接引用
taglibs.jsp内容如下:

5、 再创建一个引用properties文件的jsp文件
i18n.jsp内容如下:
<fmt:setbundle basename="com.demo.resource.member" var="addMember"></fmt:setbundle>
其中member.properties文件内容如下:
####==============Error====================
Error_001=此会员已存在!

####==============Success====================
Succ_001=增加成功!

6 、在jsp页面使用时:
如在error.jsp内容如下:

<html:html lang="true">?
??<html:base>?????
? <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">?
??
? error.jsp
? <fmt:message bundle="${addMember}"></fmt:message>???
? </html:html>

? <html:html lang="true">???
? <fmt:message bundle="${addMember}"></fmt:message>???
? </html:html>