java Struts2 - 从 JSP 访问 Action 变量
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Struts2 - Access from JSP to Action variables
提问by iammg
I have got a little problem with Struts2, and I don't know why it doesn't work ...
我的Struts2有点问题，不知道为什么不能用...
I want to pass 2 variables between two JSP, via an Action class :
我想通过 Action 类在两个 JSP 之间传递 2 个变量：
view1.jsp :
视图1.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 and var2 are the variables that I want to pass to the Action class
-> var1 和 var2 是我想传递给 Action 类的变量
struts.xml:
struts.xml:
<action name="myAction" class="MyAction" method="execute">
<result name="success">view2.jsp</result>
</action>
Action.java :
动作.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;
}
-> This works correctly ; if I put "System.out.print" with the getters, it shows me the good values of var1 (content1) and var2 (content2)
-> 这工作正常；如果我将“System.out.print”与 getter 放在一起，它会向我展示 var1 (content1) 和 var2 (content2) 的良好值
view2.jsp :
视图2.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}" />
-> There is a problem here :
I can't get the content of var1 and var2 !
-> <s:property value="var1" />and <s:textfield value="%{var1}are returning "null"
-> 这里有一个问题：我无法获取 var1 和 var2 的内容！
-><s:property value="var1" />并<s:textfield value="%{var1}返回“null”
Where is my error ? I don't understand ... I followed what the others said on the internet ...
我的错误在哪里？没看懂。。。我是跟着网上别人说的。。。
Thank you !
谢谢 ！
采纳答案by iammg
I finally found the answer to my problem !
To get the value of var1and var2I had to use those following lines :
我终于找到了我的问题的答案！
要获得的价值var1和var2我不得不使用那些下面几行：
view1.jsp :
视图1.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:
struts.xml:
<action name="myAction" class="MyAction" method="execute">
<result name="success">view2.jsp</result>
</action>
Action.java :
动作.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 :
视图2.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
%>
