如何使用约定插件在Struts 2中调用Submit按钮上的方法? [英] How to invoke a method on submit button in Struts 2 using convention plugin?

问题描述

在下面有关Struts动作类的代码中，

In the following piece of code about Struts action class,

@Namespace("/admin_side")
@ResultPath("/WEB-INF/content")  // Default.

public final class TestAction extends ActionSupport implements Serializable
{
    private static final long serialVersionUID = 1L;
    private static final String SUCCESS = "success";

    private String name;
    private String email;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    @Action(value="test",results={@Result(name="success",location="Test.jsp")})
    public String execute() throws Exception
    {
        System.out.println("name = "+name);
        System.out.println("email = "+email);
        return SUCCESS;
    }

    // Some annotations to map this method to <s:submit>
    public String postAction()
    {
        System.out.println("postAction() invoked.");
        System.out.println("name = "+name);
        System.out.println("email = "+email);
        return SUCCESS;
    }
}

我想在给定的提交按钮上调用postAction()方法，

I want to invoke the postAction() method on the given submit button like so,

<s:form action="test">
    <s:textfield id="name" name="name" label="Enter your name"/>
    <s:textfield id="email" name="email" label="Enter your email"/>

    <s:submit value="Submit" method="postAction"/>
</s:form>

---

我看到了一些问题，例如这个问题，但是它们都使用struts.xml中的XML配置.

---

I have seen some questions like this one but all of them use XML configurations in struts.xml.

如何使用约定插件?

推荐答案

您需要使用namespace属性，因为您的操作是用@Namespace映射的.

You need to use namespace attribute because your action is mapped with @Namespace.

<s:form namespace="/admin_side" action="test">
    <s:textfield id="name" name="name" label="Enter your name"/>
    <s:textfield id="email" name="email" label="Enter your email"/>

    <s:submit value="Submit" method="postAction"/>
</s:form>

如果根据 WW-4023 然后您可以直接调用方法

If this doesn't work in the latest version according to WW-4023 then you can invoke a method directly

<s:url var="myUrl" namespace="/admin_side" action="test" method="postAction"/> 
<s:form action="%{#myUrl}">
    <s:textfield id="name" name="name" label="Enter your name"/>
    <s:textfield id="email" name="email" label="Enter your email"/>

    <s:submit value="Submit"/>
</s:form>

或配置params拦截器参数excludeParams从已排除的参数中删除method参数.

or configure params interceptor parameter excludeParams to remove method parameter from excluded parameters.

请注意，您使用的是DMI和上面的方法，或者不使用它，在这种情况下，您应该将操作映射到该方法，并且不要使用属性method或submit标记的method和action作为上述问题，限制使用特殊参数.如果遵循该限制，如果有多个提交按钮，则必须使用JavaScript onclick事件动态更改form标记的action属性.

Note, either you use DMI and the methods above or don't use it, in this case you should map an action to the method and don't use attributes method or submit tag's method and action as the issue above restrict using special parameters. If you have multiple submit buttons if you follow that restriction you have to dynamically change form tag's action attribute using JavaScript onclick event.

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