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struts2 <s:iterator>遍历Map的多种方法

2017-03-19 14:15 357 查看

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>

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标签： struts2.0

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