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[英]struts2 NoSuchMethodException when trying to access Action method from JSP
[英]Struts2 - Access from JSP to Action variables
我對Struts2有點問題,我不知道為什么它不起作用...
我想通過Action類在兩個JSP之間傳遞2個變量:
view1.jsp:
<s:form action="myAction">
<input id="var1" name="var1" type="text" />
<input id="var2" name="var2" type="text" />
<button type="submit"> Ok </button>
</s:form>
-> var1和var2是我要傳遞給Action類的變量
struts.xml:
<action name="myAction" class="MyAction" method="execute">
<result name="success">view2.jsp</result>
</action>
Action.java:
public class MyAction extends DefaultActionSupport
{
private String var1;
private String var2;
public String execute() throws Exception
{
// ... Some actions ...
return SUCCESS;
}
// Getters & Setters for var1 and var2 (generated by Eclipse)
public String getVar1()
{
return var1;
}
public void setVar1(String var1)
{
this.var1 = var1;
}
public String getVar2()
{
return var2;
}
public void setVar2(String var2)
{
this.var2 = var2;
}
->這可以正常工作; 如果我將“ System.out.print”與吸氣劑放在一起,它將向我展示var1(content1)和var2(content2)的良好值
view2.jsp:
Values of var1 = <s:property value="var1" />
Values of var2 = <s:property value="var2" />
Textfield with var1 in default-value : <s:textfield value="%{var1}" />
Textfield with var2 in default-value : <s:textfield value="%{var2}" />
->這里有一個問題:我無法獲取var1和var2的內容!
-> <s:property value="var1" />
和<s:textfield value="%{var1}
”返回“ null”
我的錯誤在哪里? 我不明白...我聽了別人在互聯網上說的話...
謝謝 !
我終於找到了解決我問題的方法!
為了獲得var1
和var2
的值,我必須使用以下幾行:
view1.jsp:
<s:form action="myAction">
<input id="var1" name="var1" type="text" />
<input id="var2" name="var2" type="text" />
<button type="submit"> Ok </button>
</s:form>
struts.xml:
<action name="myAction" class="MyAction" method="execute">
<result name="success">view2.jsp</result>
</action>
Action.java:
public class MyAction extends DefaultActionSupport{
private String var1;
private String var2;
public String execute() throws Exception{
// ... Some actions ...
ActionContext.getContext().getSession().put("var1", getVar1());
ActionContext.getContext().getSession().put("var2", getVar2());
return SUCCESS;
}
// Getters & Setters for var1 and var2 (generated by Eclipse)
public String getVar1(){
return var1;
}
public void setVar1(String var1){
this.var1 = var1;
}
public String getVar2(){
return var2;
}
public void setVar2(String var2){
this.var2 = var2;
}
}
view2.jsp:
Values of var1 = <s:property value="#session.var1" />
Values of var2 = <s:property value="#session.var2" />
//To transform var1 and var2 into JSP variables :
<s:set var="var1 " value="#session.var1 " />
<s:set var="var2 " value="#session.var2" />
<jsp:useBean id="var1 " type="java.lang.String" />
<jsp:useBean id="var2 " type="java.lang.String" />
<%
String myString1 = var1;
String myString2 = var2
%>
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