简单说明Java的Struts框架中merge标签的使用方法

简单说明Java的Struts框架中merge标签的使用方法

merge标签合并标记需要两个或两个以上的列表作为参数，并把它们合并在一起，如下所示：

如果有两个列表A和B的值，A1，A2和B1，B2。合并列表，会给出A1，B1，A2，B2。

创建动作类：

首先，让我们创建一个简单的类叫做Employee.java，它看起来像：

package com.yiibai.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类有两个属性 - name 和 department，我们也有两个员工名单 - employees 和contractors。我们有一个方法叫做getRecruitmentDecider，返回Decider 对象。Decider 实现返回true，如果雇员招聘部门工作，否则返回false。

接下来，让我们创建一个DepartmentComparator 比较Employee对象：

package com.yiibai.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;

}

}

在上面的例子所示，部门比较的基础上按字母顺序排列的部门员工进行比较。

创建视图

创建一个文件叫做employee.jsp以下内容：

<%@ page contentType="text/html; charset=UTF-8"%>

<%@ taglib prefix="s" uri="/struts-tags"%>

Employees and Contractors Merged together

,

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