Question

我正在使用Struts2，并希望使用Struts2检查HashSet属性大小是否大于零。

struts.xml中

<activity
        android:name=".MainActivity"
        android:label="@string/app_name"
        android:theme="@style/AppTheme.NoActionBar" />

POJO

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

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

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

      <action name="process" 
            class="sample.action.Process" 
            method="execute">
            <interceptor-ref name="defaultStack" />
            <result name="success">/jsp/result.jsp</result>
      </action>

    </package>  
</struts>

行动类

package sample.pojo;
public class Customer{

    private Integer id;
    String name;
    int age;

    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public int getAge() {
        return age;
    }
    public void setAge(int age) {
        this.age = age;
    }
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }

}

查看

package sample.action;


import java.util.HashSet;
import java.util.Set;

import sample.pojo.Customer;

import com.opensymphony.xwork2.ActionSupport;

public class Process extends ActionSupport 
{
    private Set<Customer> result = new HashSet<Customer>();

    public String execute() 
    {
        Customer cust1 = new Customer();
        cust1.setId(1);
        cust1.setAge(59);
        cust1.setName("Subramanian");
        result.add(cust1);

        return SUCCESS;
    }

    public Set<Customer> getResult() {
        return result;
    }

    public void setResult(Set<Customer> result) {
        this.result = result;
    }
}

如果要在View中使用标记语法，请帮助Struts2。谢谢！

Answer 1

以下代码段为我工作

<s:if test="%{mySet.size()>0}">

如果标记，如何验证Struts2中的HashSet大小是否大于零？

1 个答案: