在寫應用程序時Struts時 當在執行該功能時，拋出以下錯誤；
HTTP Status 500 - No input attribute for mapping path /examOwnBatchAddAction
--------------------------------------------------------------------------------
type Status report
message No input attribute for mapping path /examOwnBatchAddAction
description The server encountered an internal error (No input attribute for mapping path /examOwnBatchAddAction) that prevented it from fulfilling this request.
//ExamOwnBatchAddForm.java
import org.apache.struts.action.*;
import javax.servlet.http.*;
public class ExamOwnBatchAddForm extends ActionForm {
private String qcode;
private String ucode;
private String action;
public String getQcode() {
return qcode;
}
public void setQcode(String qcode) {
this.qcode = qcode;
}
public String getUcode() {
return ucode;
}
public void setUcode(String ucode) {
this.ucode = ucode;
}
public String getAction() {
return action;
}
public void setAction (String action) {
this.action = action;
}
public ActionErrors validate(ActionMapping actionMapping, HttpServletRequest httpServletRequest,HttpServletResponse httpServletResponse) {
/**@todo: finish this method, this is just the skeleton.*/
ActionErrors errors = new ActionErrors();
if (ucode==null||ucode.equals("")){
errors.add(ucode, new ActionError("error.exam.nullucode"));
}
return errors;
}
public void reset(ActionMapping actionMapping, HttpServletRequest httpServletRequest,HttpServletResponse httpServletResponse) {
}
}
//ExamOwnBatchAddAction.java
public class ExamOwnBatchAddAction extends Action {
public ActionForward perform(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest httpServletRequest,
HttpServletResponse httpServletResponse){
//execute perform
ExamOwnBatchAddForm examOwnBatchAddForm = (ExamOwnBatchAddForm) actionForm;
String action = httpServletRequest.getParameter("action");
HttpSession session = httpServletRequest.getSession();
String ucode = (String) session.getAttribute("ucode");
String qcode = (String) session.getAttribute("qcode");
String target = "";
if ((ucode==null)||(ucode.equals("")))
{
target = "login";
}
else if (action.equals("BatchAdd"))
{
Exam exam = new Exam();
exam.setBatchAddExamDetail(ucode,qcode);
target = "success";
}
return actionMapping.findForward(target);
}
}
//Struts-conifg.xml
<struts-config>
<form-beans>
<form-bean name="examOwnBatchAddForm" type="ExamOwnBatchAddForm" />
</form-beans>
<global-forwards>
<forward name="errors" path="/insertError.jsp" />
<forward name="login" path="/index.jsp" />
</global-forwards>
<action-mappings>
<action name="examOwnBatchAddForm" type="ExamOwnBatchAddAction" validate="true" scope="request" path="/examOwnBatchAddAction">
<forward name="success" path="/examListAction.do" />
</action>
問題1：當在ExamOwnBatchAddForm.java中的public ActionErrors validate( )和public void reset( )中缺少“HttpServletResponse httpServletResponse”時即會拋出開頭錯誤；當在validate( )中寫入後則程序執行正常。
問題2：在ExamOwnBatchAddAction.java 中如果不寫入return actionMapping.findForward(target); 則編譯時提示missing return statement 。
問題3：在public ActionForward perform( ) 和 public ActionForward execute( ) 兩者的區別？使用perform編譯後會提示
Note: ExamOwnBatchAddAction.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.