struts2 遍历Map的多种方法 - 军军小站|张军博客

struts2 遍历Map的多种方法

主要针对以下几种情况的Map:

Java代码

private Map<String, String> strMap = new HashMap<String, String>();
private Map<String, Person> perMap = new HashMap<String, Person>();
private Map<String, String[]> strArryMap = new HashMap<String, String[]>();
private Map<String, List<Person>> perLstMap = new HashMap<String, List<Person>>();

下面给出一个示例
1).ExpressMapAction.java

Java代码

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.expre.struts2.bean.Person;
import com.expre.struts2.bean.Phone;
import com.opensymphony.xwork2.ActionSupport;
public class ExpressMapAction extends ActionSupport {
private static final long serialVersionUID = -4251480679223607716L;
private Map<String, String> strMap = new HashMap<String, String>();
private Map<String, Person> perMap = new HashMap<String, Person>();
private Map<String, String[]> strArryMap = new HashMap<String, String[]>();
private Map<String, List<Person>> perLstMap = new HashMap<String, List<Person>>();
//get&set方法,这里都省略了
@Override
public String execute() throws Exception {
// 值为字符串
strMap.put( "first" , "zxx" );
strMap.put( "second" , "lsx" );
strMap.put( "third" , "wxh" );
// 值为javabean对象
Person person = new Person( "001" , "zxx" , 22 );
person.setPhone( new Phone( "apple" , 18957157189L));
perMap.put( "one" , person);
person = new Person( "002" , "lsx" , 25 );
person.setPhone( new Phone( "HTC" , 18957157187L));
perMap.put( "two" , person);
// 数组处理
strArryMap.put( "arr1" , new String[] { "1" , "310000" , "hz" });
strArryMap.put( "arr2" , new String[] { "2" , "310001" , "xh" });
strArryMap.put( "arr3" , new String[] { "3" , "310002" , "sc" });
//list对象处理
List<Person> list= new ArrayList<Person>();
list.add( new Person( "001" , "zxx" , 22 ));
list.add( new Person( "002" , "lsx" , 25 ));
perLstMap.put( "one" , list);
list= new ArrayList<Person>();
list.add( new Person( "003" , "wlx" , 26 ));
list.add( new Person( "004" , "hzx" , 28 ));
perLstMap.put( "two" , list);
return "result" ;
}
}

2).strMap.jsp

Java代码

<html>
<body>
<ul>
<li>访问Map:<s:property value= "strMap" /></li>
<li>访问Map中某个元素:
<s:property value= "strMap.first" /> |
<s:property value= "strMap['second']" /> |
<s:property value= "strMap[\'third\']" />
</li>
<li>访问Map中所有的key:<s:property value= "strMap.keys" /></li>
<li>访问Map中所有的value:<s:property value= "strMap.values" /></li>
<li>访问容器的大小：
<s:property value= "strMap.size()" /> |
<s:property value= "strMap.size" /> //这是map特别的地方
</li>
<li>迭代循环取值,最简单
<s:iterator value= "strMap" id= "entry" >
<s:property value= "#entry" />{
key: <s:property value= "key" />
value:<s:property value= "value" />}|
</s:iterator>
</li>
<li>迭代循环取值
<s:iterator value= "strMap.keySet()" id= "key" >
<s:property value= "key" />或<s:property value= "#key" />:
<s: if test= "strMap[#key]!=null" >
<s:property value= "strMap.get(#key)" /> |
</s: if >
</s:iterator>
</li>
<li>迭代循环取数组值
<s:iterator value= "strMap" id= "entry" >
<s:property value= "#entry" />{
<s:property value= "value[0]" />
<s:property value= "value[1]" /> |
<s:property value= "value[2]" /> }
</s:iterator>
</li>
<li>迭代循环取对象值,最直接:
<ul>
<s:iterator value= "perMap" id= "entry" >
<li>
<s:property value= "#entry" /> {
ID：<s:property value= "value.ID" />
Name：<s:property value= "value.name" />
Age：<s:property value= "value.age" /> }|
</li>
</s:iterator>
</ul>
</li>
<li>迭代循环取对象的属性值
<s:iterator value= "perMap.keySet()" id= "key" >
<s:property value= "#key" />:
<s:iterator value= "perMap.get(#key)" >
<s:property value= "ID" />
<s:property value= "name" />
<s:property value= "phone.name" />
</s:iterator>|
</s:iterator>
</li>
<li>稍复杂的迭代
<s:iterator value= "perLstMap" id= "entry" >
<s:set name= "total" value= "#entry.value.size" />
<s:iterator value= "#entry.value" status= "s" >
<s: if test= "#s.first" >
<s:property value= "#entry.key" />:共${total}条
</s: if > {
<s:property value= "ID" /> |
<s:property value= "name" /> |
<s:property value= "age" />
};
</s:iterator>
</s:iterator>
</li>
</ul>
</body>
</html>

struts2 遍历Map的多种方法

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