使用Struts2标签遍历集合

• 遍历Map<String,Object>
• 遍历Map<Stirng,List<Student>>
• 遍历List<Map<String,Student>>

Student.java

package action;

public class Student {
    
    private Long sid;
    private String name;
    
    public Student() {
        // TODO Auto-generated constructor stub
    }
    public Student(Long sid,String name) {
        this.sid=sid;
        this.name=name;
    }
    public Long getSid() {
        return sid;
    }
    public void setSid(Long sid) {
        this.sid = sid;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    
    

}

ClassHelloAction.java

package action;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;public class ClassHelloAction extends AbstractAjaxAction {

    private String message;
    private List<String> names;
    private List<Student> stus;
    private Map<String, Object> map;
    private Map<String,List<Student>> stuMaps;
    private List<Map<String,Student>> listMap;

    public List<Map<String, Student>> getListMap() {
        return listMap;
    }

    public void setListMap(List<Map<String, Student>> listMap) {
        this.listMap = listMap;
    }

    public Map<String, List<Student>> getStuMaps() {
        return stuMaps;
    }

    public void setStuMaps(Map<String, List<Student>> stuMaps) {
        this.stuMaps = stuMaps;
    }

    public List<Student> getStus() {
        return stus;
    }

    public Map<String, Object> getMap() {
        return map;
    }

    public void setMap(Map<String, Object> map) {
        this.map = map;
    }

    public void setStus(List<Student> stus) {
        this.stus = stus;
    }

    public List<String> getNames() {
        return names;
    }

    public void setNames(List<String> names) {
        this.names = names;
    }

    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String execute() throws Exception {

        this.stuMaps=new HashMap<String, List<Student>>();
        List<Student> list1=new ArrayList<Student>();
        list1.add(new Student(1L,"aa"));
        list1.add(new Student(2L,"bb"));
        list1.add(new Student(3L,"cc"));
        list1.add(new Student(4L,"dd"));
        
        List<Student> list2=new ArrayList<Student>();
        list2.add(new Student(1L,"qq"));
        list2.add(new Student(2L,"ww"));
        list2.add(new Student(3L,"ee"));
        list2.add(new Student(4L,"rr"));
        //List<Student>
        stus=new ArrayList<Student>();
        stus.addAll(list1);
        stus.addAll(list2);
        
        //Map<String,Object>
        this.map=new HashMap<String, Object>();
        map.put("1", "广州");
        map.put("2", "珠海");
        map.put("3", "东莞");
        map.put("4", "佛山");
        
        //Map<string,List<Student>>
        stuMaps.put("一班", list1);
        stuMaps.put("二班", list2);
        
        //List<Map<String,Student>>
        this.listMap=new ArrayList<Map<String,Student>>();
        Map<String,Student> map1=new HashMap<String, Student>();
        map1.put("1号", new Student(1L,"鸣人"));
        map1.put("2号", new Student(2L,"佐助"));
        Map<String,Student> map2=new HashMap<String, Student>();
        map1.put("3号", new Student(3L,"路飞"));
        map1.put("4号", new Student(4L,"索隆"));
        listMap.add(map1);
        listMap.add(map2);
        
        return "success";

    }
    
    }

1、遍历Map<String,Object>

<div style="float: left; border:thin solid;" >
        <p>遍历Map&lt;String,Objecg&gt;</p>
        <ul>
            <s:iterator value="map" id="id">
                <li><s:property value="#id.key" />:<s:property
                        value="#id.value" /></li>
            </s:iterator>
        </ul>
    </div>

2、遍历Map<String,List<Student>>

<div style="float: left;border: thin solid;">
        <p>遍历Map&lt;String,List&lt;Student&gt;&gt;</p>
        <ul>
            <s:iterator value="stuMaps" id="id" status="st">

                <li><s:property value="#id.key" />: <s:select list="#id.value"
                        id="stu" listKey="sid" listValue="name"></s:select></li>

            </s:iterator>
        </ul>
    </div>

3、遍历List<Map<String,Student>>

<div style="float: left;border:thin solid;">
        <p>遍历List&lt;Map&lt;String,Student&gt;&gt;</p>
        <ul>
            <s:iterator value="listMap" id="map" status="st">
                <s:iterator value="#map" id="mk" status="sa">
                    <li><s:property value="#mk.key" />:<s:property
                            value="#mk.value.name" /></li>
                </s:iterator>
            </s:iterator>
        </ul>
    </div>

4、index.jsp页面效果：