使用Struts2的iterator标签遍历复杂的Map类型_struts标签遍历java类中的常量map-CSDN博客

本文介绍如何在Struts2框架中使用Map结构来传递母亲与孩子之间的关系数据，包括实体类定义、Action配置及页面展示。

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1.创建一个Web工程，添加Struts2支持。
2.创建两个实体类：
a). Mother(母亲)的Java类。
package struts.map.entity;

import java.io.Serializable;

public class Mother implements Serializable {

private static final long serialVersionUID = 1L;

private int motherId;         // 母亲ID
     private String motherName;         // 母亲名字
     public int getMotherId() {
return motherId;
}
public void setMotherId( int motherId) {
this.motherId = motherId;
}
public String getMotherName() {
return motherName;
}
public void setMotherName(String motherName) {
this.motherName = motherName;
}
}

b).Children(孩子)的Java类

package struts.map.entity;

import java.io.Serializable;

public class Children implements Serializable {

private static final long serialVersionUID = 1L;

private int childId;         // 孩子ID
     private int motherId;         // 母亲的ID
     private String childName;         // 孩子名字

public int getChildId() {
return childId;
}
public void setChildId( int childId) {
this.childId = childId;
}
public int getMotherId() {
return motherId;
}
public void setMotherId( int motherId) {
this.motherId = motherId;
}
public String getChildName() {
return childName;
}
public void setChildName(String childName) {
this.childName = childName;
}
}

3. 创建一个Action，并创建一位母亲和她的孩子。

package struts.map.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import struts.map.entity.Children;
import struts.map.entity.Mother;

import com.opensymphony.xwork2.ActionSupport;

public class Struts2_Map extends ActionSupport {

private static final long serialVersionUID = 1L;

private Map<Mother,List<Children>> motherChildn;

public Map<Mother, List<Children>> getMotherChildn() {
return motherChildn;
}

@Override
public String execute() throws Exception {
/* -------------------以对象做父节点的键，List做子节点的值，的Map----------------------- */
Mother mother = new Mother();
mother.setMotherId(10000);
mother.setMotherName("花木兰");

Children children1 = new Children();
children1.setChildId(10000);
children1.setMotherId(10000);
children1.setChildName("小花木兰1");

Children children2 = new Children();
children2.setChildId(10001);
children2.setMotherId(10000);
children2.setChildName("小花木兰2");

Children children3 = new Children();
children3.setChildId(10002);
children3.setMotherId(10000);
children3.setChildName("小花木兰3");

motherChildn = new HashMap<Mother,List<Children>>();

List<Children> childrens = new ArrayList<Children>();

childrens.add(children1);
childrens.add(children2);
childrens.add(children3);

motherChildn.put(mother,childrens);

return SUCCESS;
}
}

struts.xml

<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd" >
< struts >
< package name ="map" extends ="struts-default" >
< action name ="struts_map" class ="struts.map.test.Struts2_Map" >
< result >result.jsp </ result >
</ action >
</ package >
</ struts >

4.创建两个页面：
a).跳转页面：

<% @ page language = " java " pageEncoding = " UTF-8 " %>
<%
String path = request.getContextPath();
%>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
< html >
< head >

< title >Struts_Map </ title >
< meta http-equiv ="pragma" content ="no-cache" >
< meta http-equiv ="cache-control" content ="no-cache" >
< meta http-equiv ="expires" content ="0" >
< meta http-equiv ="keywords" content ="keyword1,keyword2,keyword3" >
< meta http-equiv ="description" content ="This is my page" >
</ head >

< body >
< a href ="struts_map.action" >查看Map </ a >
</ body >
</ html >

b).最终页面，也是作重要的页面：

<% @ page language = " java " pageEncoding = " UTF-8 " %>
<% @taglib uri = " /struts-tags " prefix = " s " %>
<%
String path = request.getContextPath();
%>

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" >
< html >
< head >

< title >Struts_Map </ title >
< meta http-equiv ="pragma" content ="no-cache" >
< meta http-equiv ="cache-control" content ="no-cache" >
< meta http-equiv ="expires" content ="0" >
< meta http-equiv ="keywords" content ="keyword1,keyword2,keyword3" >
< meta http-equiv ="description" content ="This is my page" >
</ head >

< body >
< div >
< h3 >-----------------以对象做父节点的键，List做子节点的值，的Map-------------------- </ h3 >
< s:iterator var ="mc" value ="motherChildn" >
< div >
母亲名称： < s:property value ="key.motherName" />
</ div >
< s:iterator var ="ch" value ="value" >
< div >
   孩子名称： < s:property value ="#ch.childName" />
</ div >
</ s:iterator >
</ s:iterator >
</ div >
</ body >
</ html >

最终运行结果：