无法在多个提交按钮中调用我的方法

Question

我在 jsp 页面中使用多个使用 struts2 标签的提交按钮来调用 java class 中的不同方法，但这些方法没有被调用。

我的 jsp 页面是：-

 <s:form theme="simple">
 <table style="width:20%;" style="float:left;" cellspacing="0"    cellpadding="0" border="0">
<tr style="white-space:nowrap;">
<td><s:submit name="togglecomplete" value="togglecomplete"action="toggletodotrue"/></td>
<td><s:submit name="toggle"  value="cleartodos" action="cleartodo"/></td>
<td><s:submit name="toggleincomplete" value="toggleincomplete" action="toggletodofalse"/><td>
</tr>
</table>
</s:form>

我的 struts.xml 是

<struts>   
<package>
<action name="toggletodotrue" class="com.action.JtableAction"
        method="togglecompleted">
        <result name="success" type="redirect">listTodo</result>
    </action>
    <action name="cleartodo" class="com.action.JtableAction"
        method="clearcompleted">
        <result name="success" type="redirect">listTodo</result>
    </action>
    <action name="toggletodofalse" class="com.action.JtableAction"
        method="toggleincomplete">
        <result name="success" type="redirect">listTodo</result>
    </action>
    <package>
    <struts>

java class 是

public class JtableAction extends ActionSupport implements ModelDriven<TODO>   {
public String togglecompleted ()throws IOException
{

    try{
        System.out.println("inside toggle completed");
        dao.completeAllTodo();
    }
    catch(Exception e)
    {
        System.out.println(e.getMessage());
    }

    return Action.SUCCESS;
}

public String clearcompleted() throws IOException{
    try{
        System.out.println("inside clear completed");
        dao.clearCompleteTodo();
    }
    catch(Exception e)
    {
        System.out.println(e.getMessage());
    }

    return Action.SUCCESS;
}

public String toggleincomplete()throws IOException
{
    try
    {
        dao.toggleIncompleteTodo();
    }

    catch(Exception e)
    {
        System.out.println(e.getMessage());
    }

    return Action.SUCCESS;
}

这些 java 方法没有被调用

Answer 1

您似乎缺少表单中的默认操作。

更优雅的解决方案可能是对同一操作使用多个映射。这样你就不需要将 "struts.enable.DynamicMethodInvocation" 设置为 "true".

在JSP

<s:form method="post" action="mySubmitAction">
    <s:submit value="Submit"/>
    <s:submit value="Clear" action="myClearAction"/>
</form>

在struts.xml

<action name="mySubmitAction" class="MyAction" method="submit">
       <result>submit.jsp</result>
</action>
<action name="myClearAction" class="MyAction" method="clear">
       <result>submit.jsp</result>
</action>

然后在MyAction中class

public String submit() throws Exception {
    // submit button logic here
    return SUCCESS;
}

public String clear() throws Exception {
    // clear button logic here
    return SUCCESS;
}

为了最佳实践，如果您有通过操作（提交和清除）加载/管理的公共数据，那么例如，您可以定义一个 MyBaseAction class，由 MySubmitAction 和 MyClearAction class.然后这是他们的样子：

在struts.xml

<action name="mySubmitAction" class="MySubmitAction">
       <result>submit.jsp</result>
</action>
<action name="myClearAction" class="MyClearAction">
       <result>submit.jsp</result>
</action>

You don't need to specify a method name anymore, that means we will use the default execute() method.

然后在MyAction、MySubmitAction和MyClearAction中class

MyAction.java

public class MyAction extends ActionSupport {
    // common data or logic here
}
MySubmitAction.java
public class MySubmitAction extends MyAction {

    public String execute() throws Exception {
        // submit button logic here
        return SUCCESS;
    }
}
MyClearAction.java
public class MyClearAction extends MyAction {

    public String execute() throws Exception {
        // clear button logic here
        return SUCCESS;
    }
}

参考：API

无法在多个提交按钮中调用我的方法

Not able to call my methods in multiple submit buttons

jsp

struts2