//Userbean代码  1 package com.test.web.bean; 2  3 public class User implements Comparable
      
        { 4     private Integer id; 5     private String name; 6     public Integer getId() { 7         return id; 8     } 9     public void setId(Integer id) {10         this.id = id;11     }12     public String getName() {13         return name;14     }15     public void setName(String name) {16         this.name = name;17     }18     19     public String sayHello(){20         System.out.println("hello");21         return "hello";22     }23     @Override24     public int compareTo(User o) {25         return this.id - o.getId();26     }27 }
      

 

//action代码  1 package com.test.web.action; 2  3 import java.util.ArrayList; 4 import java.util.Arrays; 5 import java.util.Collections; 6 import java.util.Comparator; 7 import java.util.HashMap; 8 import java.util.HashSet; 9 import java.util.List;10 import java.util.Map;11 import java.util.Set;12 13 import org.struts2.action.utils.BaseAction;14 15 import sun.util.locale.StringTokenIterator;16 17 import com.opensymphony.xwork2.ActionContext;18 import com.opensymphony.xwork2.util.CompoundRoot;19 import com.opensymphony.xwork2.util.ValueStack;20 import com.test.web.bean.User;21 22 public class TagAction extends BaseAction {23     private static final long    serialVersionUID    = -83430767514766103L;24     private User[]                userArray            = new User[5];25     private List
     
                  userList            = new ArrayList<>();26     private Set
      
                   userSet                = new HashSet<>();27     private Map
       
            userMap                = new HashMap<>();28 29     public User[] getUserArray() {30         return userArray;31     }32 33     public void setUserArray(User[] userArray) {34         this.userArray = userArray;35     }36 37     public List
        
          getUserList() {38         return userList;39     }40 41     public void setUserList(List
         
           userList) {42         this.userList = userList;43     }44 45     public Set
          
            getUserSet() {46 return userSet;47 }48 49 public void setUserSet(Set
           
             userSet) {50 this.userSet = userSet;51 }52 53 public Map
            
              getUserMap() {54 return userMap;55 }56 57 public void setUserMap(Map
             
               userMap) {58 this.userMap = userMap;59 }60 61 public String getHello() {62 return "hello";63 }64 65 @Override66 public String execute() throws Exception {67 Map
              
                contextMap = ActionContext.getContext()68 .getContextMap();69 ValueStack valueStack = ActionContext.getContext().getValueStack();70 71 System.out.println(valueStack);72 Map
               
                 context = valueStack.getContext();73 74 CompoundRoot root = valueStack.getRoot();75 System.out.println(root);76 77 System.out.println(contextMap.getClass());78 System.out.println(context.getClass());79 80 Collections.sort(userList); 81 82 for (int i = 0; i < 5; i++) {83 User u = new User();84 u.setId(i + 1);85 u.setName("name" + (i + 1));86 87 userArray[i] = u;88 userList.add(u);89 userSet.add(u);90 userMap.put("name" + (i + 1), u);91 }92 return SUCCESS;93 }94 }
               
              
             
            
           
          
         
        
       
      
     

 

//jsp页面代码 <%@ page pageEncoding="UTF-8"%>
     <%@ taglib uri="/struts-tags" prefix="s"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>    
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
         
             
                  
               
          
      
     

注意一点 struts2和核心标签库的区别 struts2的标签获取值可以用el表达式也可以用ognl表达式 核心标签只能用el表达式

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