struts2
    
     遍历map小结1.MapAction.java import java.util.ArrayList;   import java.util.HashMap;   import java.util.List;   import java.util.Map;  import com.opensymphony.xwork2.ActionSupport import com.model.Student public class MapAction extends ActionSupport   {         private Map
     
       map;             private Map
      
        studentMap;              private Map
       
         arrayMap;              private Map
        
         
          > listMap; public String testMap() { map=new HashMap
          
           (); map.put("1", "one"); map.put("2", "two"); studentMap=new HashMap
           
            (); studentMap.put("student1",new Student(new Long(1),"20034140201","张三1","男",25)); studentMap.put("student2",new Student(new Long(2),"20034140202","张三2","女",26)); studentMap.put("student3",new Student(new Long(3),"20034140202","张三3","男",27)); arrayMap=new HashMap
            
             (); arrayMap.put("arr1", new String[]{"1","2003401","leejie","male","20"}); arrayMap.put("arr2", new String[]{"2","2003402","huanglie","male","25"}); arrayMap.put("arr3", new String[]{"3","2003403","lixiaoning","male","21"}); listMap=new HashMap
             
              
               >(); List
               
                 list1=new ArrayList
                
                 (); list1.add(new Student(new Long(1),"20034140201","张三1","男",25)); list1.add(new Student(new Long(2),"20034140202","张三2","男",25)); list1.add(new Student(new Long(3),"20034140203","张三3","男",25)); listMap.put("class1", list1); List
                 
                   list2=new ArrayList
                  
                   (); list2.add(new Student(new Long(1),"20034140301","李四1","男",20)); list2.add(new Student(new Long(2),"20034140302","李四2","男",21)); list2.add(new Student(new Long(3),"20034140303","李四3","男",22)); list2.add(new Student(new Long(4),"20034140304","李四4","男",23)); listMap.put("class2", list2); return SUCCESS; } public Map
                   
                     getMap() { return map; } public void setMap(Map
                    
                      map) { this.map = map; } public Map
                     
                       getStudentMap() { return studentMap; } public void setStudentMap(Map
                      
                        studentMap) { this.studentMap = studentMap; } public Map
                       
                         getArrayMap() { return arrayMap; } public void setArrayMap(Map
                        
                          arrayMap) { this.arrayMap = arrayMap; } public Map
                         
                          > getListMap() { return listMap; } public void setListMap(Map
                          
                           > listMap) { this.listMap = listMap; } } 2.testMap.jsp <%@ page contentType="text/html;charset=UTF-8" %> <%@ taglib prefix="s" uri="/struts-tags" %>   
                              
                           1.map中的value为String字符串
                           
 
                            
                            
                            
 key: 
                            
                            
 value:
                            
                            
 ******************************************
                            
 
                            
                           2.map中的value为Student对象 
                            
                           
                           
                             
                             
                               
key=value
                               
ID
                               
num
                               
name
                               
sex
                               
age
                              
                              
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                              
                              
                           
 
                           
 3.map中的value为String数组 
                            
                           
                           
                             
                             
                               
key=value
                               
ID
                               
num
                               
name
                               
sex
                               
age
                              
                              
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                              
                              
                           
 
                           
 4.map中的value为list集合 
                            
                             
                            
                           
                           
 <1.
                             
                             
                               
class
                               
ID
                               
num
                               
name
                               
sex
                               
age
                              
                             
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                               
                              
                               
                           
 -------------------------------------------------------------------------------------------------------------------------------------------------4、普通属性 public String execute(){ username = "zhangsan"; password = "123"; } 
                           
                           
 
                           
                           
 5、自定义对象 public String execute(){ userInfo = new UserInfo(); userInfo.setUsername("hhh"); userInfo.setPassword("111"); } 
                           
                           
 
                           
                           
 6、List（普通属性） public String execute(){ list = new ArrayList
                           
                            (); list.add("aaa"); list.add("bbb"); list.add("ccc"); } 
                             
                             
                             
 
                             或者： 
                             
                             
                             
 
                             6、List（自定义对象属性） public String execute(){ list = new ArrayList
                            
                             (); UserInfo userInfo = new UserInfo(); userInfo.setUsername("u1"); userInfo.setPassword("p1"); userInfo.setRoleInfo(new RoleInfo("r1")); list.add(userInfo); userInfo = new UserInfo(); userInfo.setUsername("u2"); userInfo.setPassword("p2"); userInfo.setRoleInfo(new RoleInfo("r2")); list.add(userInfo); } 
                              
                               
                               
                              
                              
 
                              或者： 
                              
                               
                               
                              
                              
 
                              7、数组（普通属性） public String execute(){ strs = new String[2]; strs[0] = "as"; strs[1] = "asd"; } 
                              
                              
                              
 
                              或者： 
                              
                              
                              
 
                              8、数组（自定义对象属性） public String execute(){ strs = new UserInfo[2]; UserInfo userInfo = new UserInfo(); userInfo.setUsername("u11"); userInfo.setPassword("11"); strs[0] = userInfo; userInfo = new UserInfo(); userInfo.setUsername("u22"); userInfo.setPassword("22"); strs[1] = userInfo; } 
                              
                               
                              
                              
 
                              或者： 
                              
                               
                              
                              
 
                              8、数组（自定义对象属性） public String execute(){ strs = new UserInfo[2]; UserInfo userInfo = new UserInfo(); userInfo.setUsername("u11"); userInfo.setPassword("11"); userInfo.setRoleInfo(new RoleInfo("r11")); strs[0] = userInfo; userInfo = new UserInfo(); userInfo.setUsername("u22"); userInfo.setPassword("22"); userInfo.setRoleInfo(new RoleInfo("r22")); strs[1] = userInfo; } 
                              
                               
                               
                              
                              
 
                              或者： 
                              
                               
                               
                              
                              
 
                              8、Map（普通属性） public String execute(){ map = new HashMap
                             
                              (); map.put("k1", "v1"); map.put("k2", "v2"); } 
                               
                                
                               
                               
 
                               或者： 
                               
                                
                               
                               
 
                               8、Map（自定义对象属性） public String execute(){ map = new HashMap
                              
                               (); UserInfo userInfo = new UserInfo(); userInfo.setUsername("u1"); userInfo.setPassword("p1"); userInfo.setRoleInfo(new RoleInfo("r1")); map.put("k1", userInfo); userInfo = new UserInfo(); userInfo.setUsername("u2"); userInfo.setPassword("p2"); userInfo.setRoleInfo(new RoleInfo("r2")); map.put("k2", userInfo); } 
                                
                                 
                                 
                                 
                                
                                
 
                                或者 
                                
                                 
                                 
                                 
                                
                                
 
                                8、Map嵌套Map（自定义对象属性） public String execute(){ map = new TreeMap
                               
                                
                                 >(); Map
                                 
                                   innerMap = new TreeMap
                                  
                                   (); UserInfo userInfo = new UserInfo(); userInfo.setUsername("u1"); userInfo.setPassword("p1"); userInfo.setRoleInfo(new RoleInfo("r1")); userInfo = new UserInfo(); userInfo.setUsername("u11"); userInfo.setPassword("p11"); userInfo.setRoleInfo(new RoleInfo("r11")); innerMap.put("k1", userInfo); innerMap.put("k11", userInfo); map.put("key1", innerMap); // innerMap = new TreeMap
                                   
                                    (); userInfo = new UserInfo(); userInfo.setUsername("u2"); userInfo.setPassword("p2"); userInfo.setRoleInfo(new RoleInfo("r2")); userInfo = new UserInfo(); userInfo.setUsername("u22"); userInfo.setPassword("p22"); userInfo.setRoleInfo(new RoleInfo("r22")); innerMap.put("k2", userInfo); innerMap.put("k22", userInfo); map.put("key2", innerMap); }