Struts2:方法属性在按钮不起作用。

I have a form in jsp. There are two submit buttons: "Search" and "Add New" button. I had set each button with their own method attribute.

我在jsp中有一个表单。有两个提交按钮:“搜索”和“添加新”按钮。我已经用他们自己的方法属性设置了每个按钮。

<s:form name="searchForm" action="employeeAction" method="post">
    <s:textfield name="id" label="Employee ID"/>
    <s:textfield name="name" label="Employee Name"/>

    <s:submit value="Search" method="doSearch"/>
    <s:submit value="Add New" method="doAddNew"/>
</s:form>

In struts.xml

在struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>

    <constant name="struts.enable.DynamicMethodInvocation" value="false" />
    <constant name="struts.devMode" value="true" />

    <package name="default" namespace="/" extends="struts-default">

        <default-action-ref name="index" />

        <global-results>
            <result name="error">/error.jsp</result>
        </global-results>

        <global-exception-mappings>
            <exception-mapping exception="java.lang.Exception" result="error"/>
        </global-exception-mappings>

    </package>

    <package name="example" namespace="/example" extends="default">

        <action name="employeeAction" class="example.EmployeeAction">
           <result name="search">/example/search.jsp</result>
           <result name="add">/example/add.jsp</result>
        </action>

    </package>
</struts>

In EmployeeAction class

在EmployeeAction类

public class EmployeeAction extends ActionSupport {

    private static final Logger logger = Logger.getLogger(EmployeeAction.class);

    @Override
    public String execute() throws Exception {    
        logger.info("Calling execute!");    
        return SUCCESS;
    }

    public String doSearch() throws Exception {    
        logger.info("Calling doSearch!");    
        return "search";
    }

    public String doAddNew() throws Exception {    
        logger.info("Calling doAddNew!");    
        return "add";
    }
}

The problem is when I clicked "Search" or "Add New" button, the method doSearch() or doAddNew() was never called, instead it called method execute(). What is wrong with my code above?

问题是，当我点击“搜索”或“添加新的”按钮时，方法doSearch()或doAddNew()从未被调用，而是称为方法execute()。上面的代码有什么问题?

I'm using struts v2.3.

我使用struts v2.3。

1 个解决方案

#1

Set

集

<constant name="struts.enable.DynamicMethodInvocation" value="false" />

to

来

<constant name="struts.enable.DynamicMethodInvocation" value="true" />

Another way is to define multiple mappings for the same Action, like

另一种方法是为相同的操作定义多个映射。

in JSP:

JSP:

<s:submit value="Search"  action="employeeSearchAction" />
<s:submit value="Add New" action="employeeAddNewAction"/>

in Struts.xml

在Struts.xml

<action name="employeeSearchAction" class="example.EmployeeAction" method="doSearch">
       <result>/example/search.jsp</result>
</action>
<action name="employeeAddNewAction" class="example.EmployeeAction" method="doAddNew">
       <result>/example/add.jsp</result>
</action>

A third way is to use Wildcard Mappings.

第三种方法是使用通配符映射。

P.S: If you go for the second one, I'll suggest, as a best practice, to use one Action for every logical action you have to perform...

P。S:如果你选择第二种，我建议你最好的做法是，为每一个你必须要做的逻辑动作使用一个动作……

If you have common data loaded / managed by both your actions, "search" and "addNew", then you can define a employeeBaseAction, extended by both employeeSearchAction and employeeAddNewAction.

如果您的操作、“搜索”和“addNew”都有共同的数据加载/管理，那么您可以定义employeeBaseAction，它由employeeSearchAction和employeeAddNewAction扩展。

---

EDIT

It's 2014 now, and DMI usage is unanimously discouraged (today more than ever), other than pretty useless, so I strongly suggest you to use solution n.2.

现在已经是2014年了，DMI的使用是一致的(今天比以往任何时候都要多)，除了无用，所以我强烈建议您使用解决方案。