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Struts2 merge標(biāo)簽

2018-12-26 07:17 更新

假設(shè)你有A和B兩個(gè)列表，值為A1，A2和B1，B2。合并列表將得出A1，B1，A2，B2。

創(chuàng)建Action類

首先讓我們創(chuàng)建一個(gè)簡(jiǎn)單的類Employee.java，如下：

package cn.w3cschool.struts2;

import java.util.ArrayList;
import java.util.List;

import org.apache.struts2.util.SubsetIteratorFilter.Decider;

public class Employee {
   private String name;
   private String department;

   public Employee(){}
   public Employee(String name,String department)
   {
      this.name = name;
      this.department = department;
   }
   private List employees;
   private List contractors;
	
   public String execute() {
      employees = new ArrayList();
      employees.add(new Employee("George","Recruitment"));
      employees.add(new Employee("Danielle","Accounts"));
      employees.add(new Employee("Melissa","Recruitment"));
      employees.add(new Employee("Rose","Accounts"));

      contractors = new ArrayList();
      contractors.add(new Employee("Mindy","Database"));
      contractors.add(new Employee("Vanessa","Network"));
      return "success";
   }

   public Decider getRecruitmentDecider() {
      return new Decider() {
         public boolean decide(Object element) throws Exception {
            Employee employee = (Employee)element;
            return employee.getDepartment().equals("Recruitment");
         }
      };
   }
   public String getName() {
      return name;
   }
   public void setName(String name) {
      this.name = name;
   }
   public String getDepartment() {
      return department;
   }
   public void setDepartment(String department) {
      this.department = department;
   }
   public List getEmployees() {
      return employees;
   }
   public void setEmployees(List employees) {
      this.employees = employees;
   }
   public List getContractors() {
      return contractors;
   }
   public void setContractors(List contractors) {
      this.contractors = contractors;
   }
	
}

Employee類有兩個(gè)屬性：name和department，我們還有兩個(gè)employee列表：永久的employees和contractors。我們有一個(gè)名為getRecruitmentDecider的方法，它返回一個(gè)Decider對(duì)象。如果員工在recruitment（招聘）部門工作，則Decider實(shí)現(xiàn)返回true，否則返回false。
接下來(lái)，創(chuàng)建一個(gè)DepartmentComparator來(lái)比較Employee對(duì)象：

package cn.w3cschool.struts2;

import java.util.Comparator;

public class DepartmentComparator implements Comparator {
   public int compare(Employee e1, Employee e2) {
      return e1.getDepartment().compareTo(e2.getDepartment());
   }

   @Override
   public int compare(Object arg0, Object arg1) {
		return 0;
	}
}

如上例所示，部門比較器按字母順序比較部門的員工。

創(chuàng)建視圖

創(chuàng)建一個(gè)名為employee.jsp的文件，包含以下內(nèi)容：

<%@ page contentType="text/html; charset=UTF-8"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<html>
<head>
<title>Employees</title>
</head>
<body>
   <b>Employees and Contractors Merged together</b>
   <br />
   <s:merge id="allemployees">
      <s:param value="employees" />
      <s:param value="contractors" />
   </s:merge>
   <s:iterator value="allemployees">
      <s:property value="name"/>,
      <s:property value="department"/><br/>
   </s:iterator>
</body>
</html>

merge標(biāo)簽需要兩個(gè)或更多列表作為參數(shù)。我們需要給merge標(biāo)簽一個(gè)id，以便以后可以重新使用它。在此示例中，我們提供employees和contractors作為merge標(biāo)簽的參數(shù)。然后，使用“allemployees”id迭代合并列表并打印員工詳細(xì)信息。

配置文件

你的struts.xml應(yīng)該如下：

<?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="helloworld" extends="struts-default">
      <action name="employee" 
         class="com.tutorialspoint.struts2.Employee"
         method="execute">
         <result name="success">/employee.jsp</result>
      </action>
   </package>

</struts>

你的web.xml應(yīng)該如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
   xmlns="http://java.sun.com/xml/ns/javaee" 
   xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"
   xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
   http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
   id="WebApp_ID" version="3.0">
   
   <display-name>Struts 2</display-name>
   <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
   </welcome-file-list>
   <filter>
      <filter-name>struts2</filter-name>
      <filter-class>
         org.apache.struts2.dispatcher.FilterDispatcher
      </filter-class>
   </filter>

   <filter-mapping>
      <filter-name>struts2</filter-name>
      <url-pattern>/*</url-pattern>
   </filter-mapping>
</web-app>

右鍵單擊項(xiàng)目名稱，然后單擊“Export”> “WAR File”以創(chuàng)建WAR文件。然后在Tomcat的webapps目錄中部署WAR文件。最后，啟動(dòng)Tomcat服務(wù)器并嘗試訪問(wèn)URL http://localhost:8080/HelloWorldStruts2/employee.jsp，將顯示以下界面：

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