[Struts2]<s:iterator>各种遍历用法
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1.MapAction.javaimport java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map; import com.opensymphony.xwork2.ActionSupportimport com.model.Studentpublic class MapAction extends ActionSupport { private Map<String,String> map; private Map<String,Student> studentMap; private Map<String,String[]> arrayMap; private Map<String,List<Student>> listMap; public String testMap() { map=new HashMap<String,String>(); map.put("1", "one"); map.put("2", "two"); studentMap=new HashMap<String,Student>(); 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<String,String[]>(); 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<String,List<Student>>(); List<Student> list1=new ArrayList<Student>(); 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<Student> list2=new ArrayList<Student>(); 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<String, String> getMap() { return map; } public void setMap(Map<String, String> map) { this.map = map; } public Map<String, Student> getStudentMap() { return studentMap; } public void setStudentMap(Map<String, Student> studentMap) { this.studentMap = studentMap; } public Map<String, String[]> getArrayMap() { return arrayMap; } public void setArrayMap(Map<String, String[]> arrayMap) { this.arrayMap = arrayMap; } public Map<String, List<Student>> getListMap() { return listMap; } public void setListMap(Map<String, List<Student>> listMap) { this.listMap = listMap; } } 2.testMap.jsp<%@ page contentType="text/html;charset=UTF-8" %> <%@ taglib prefix="s" uri="/struts-tags" %> <html> <head> <title>struts2中的map遍历总结</title> </head> <body> <b>1.map中的value为String字符串</b><br> <s:iterator value="map" id="column"> <s:property value="#column"/><br> key: <s:property value="key"/><br> value:<s:property value="value"/><br> ******************************************<br> </s:iterator> <b>2.map中的value为Student对象</b> <table border="1" width="50%" cellspacing="0" cellpadding="0"> <tr> <td>key=value</td> <td>ID</td> <td>num</td> <td>name</td> <td>sex</td> <td>age</td> </tr> <s:iterator value="studentMap" id="column"> <tr> <td><s:property value="#column"/></td> <td><s:property value="value.id"/></td> <td><s:property value="value.num"/></td> <td><s:property value="value.name"/></td> <td><s:property value="value.sex"/></td> <td><s:property value="value.age"/></td> </tr> </s:iterator> </table> <p> <b>3.map中的value为String数组</b> <table border="1" width="50%" cellspacing="0" cellpadding="0"> <tr> <td>key=value</td> <td>ID</td> <td>num</td> <td>name</td> <td>sex</td> <td>age</td> </tr> <s:iterator value="arrayMap" id="column"> <tr> <td><s:property value="#column"/></td> <td><s:property value="value[0]"/></td> <td><s:property value="value[1]"/></td> <td><s:property value="value[2]"/></td> <td><s:property value="value[3]"/></td> <td><s:property value="value[4]"/></td> </tr> </s:iterator> </table> <p> <b>4.map中的value为list集合</b> <table border="1" width="50%" cellspacing="0" cellpadding="0"> <tr> <td>class</td> <td>ID</td> <td>num</td> <td>name</td> <td>sex</td> <td>age</td> </tr> <1.<s:iterator value="listHashMap" id="listid"> <s:iterator value="#listid.value" id="listidsub"> <tr> <td><s:property value="key"/></td> <td><s:property value="id"/></td> <td><s:property value="num"/></td> <td><s:property value="name"/></td> <td><s:property value="sex"/></td> <td><s:property value="age"/></td> </tr> </s:iterator> </s:iterator> </table> </body> </html>4、普通属性public String execute(){ username = "zhangsan"; password = "123";}<s:property value="username"/><br> <s:property value="password"/><br>5、自定义对象public String execute(){ userInfo = new UserInfo(); userInfo.setUsername("hhh"); userInfo.setPassword("111");}<s:property value="userInfo.username"/><br> <s:property value="userInfo.password"/><br>6、List（普通属性） public String execute(){ list = new ArrayList<String>(); list.add("aaa"); list.add("bbb"); list.add("ccc");}<s:iterator value="list" var="var"> <s:property value="var"/><br> </s:iterator> 或者： <s:iterator value="list"> <s:property/><br> </s:iterator>6、List（自定义对象属性）public String execute(){ list = new ArrayList<UserInfo>(); 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);}<s:iterator value="list" var="var"> <s:property value="#var.username"/> <s:property value="#var.password"/> <s:property value="#var.roleInfo.rolename"/><br></s:iterator>或者：<s:iterator value="list"> <s:property value="username"/> <s:property value="password"/> <s:property value="roleInfo.rolename"/><br></s:iterator>7、数组（普通属性）public String execute(){ strs = new String[2]; strs[0] = "as"; strs[1] = "asd";}<s:iterator value="strs"> <s:property/><br> </s:iterator>或者：<s:iterator value="strs" var="var"> <s:property value="var"/><br> </s:iterator>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;}<s:iterator value="strs"> <s:property value="username"/> <s:property value="password"/><br> </s:iterator>或者：<s:iterator value="strs" var="var"> <s:property value="#var.username"/> <s:property value="#var.password"/><br></s:iterator>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;}<s:iterator value="strs" var="var"> <s:property value="#var.username"/> <s:property value="#var.password"/> <s:property value="#var.roleInfo.rolename"/><br></s:iterator>或者：<s:iterator value="strs"> <s:property value="username"/> <s:property value="password"/> <s:property value="roleInfo.rolename"/><br></s:iterator>8、Map（普通属性）public String execute(){ map = new HashMap<String,String>(); map.put("k1", "v1"); map.put("k2", "v2");}<s:iterator value="map" var="var"> <s:property value="#var.key"/> <s:property value="#var.value"/><br></s:iterator>或者：<s:iterator value="map"> <s:property value="key"/> <s:property value="value"/><br></s:iterator>8、Map（自定义对象属性）public String execute(){ map = new HashMap<String,UserInfo>(); 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);}<s:iterator value="map" var="var"> <s:property value="#var.key"/> <s:property value="#var.value.username"/> <s:property value="#var.value.password"/> <s:property value="#var.value.roleInfo.rolename"/><br></s:iterator>或者<s:iterator value="map"> <s:property value="key"/> <s:property value="value.username"/> <s:property value="value.password"/> <s:property value="value.roleInfo.rolename"/><br></s:iterator>8、Map嵌套Map（自定义对象属性）public String execute(){ map = new TreeMap<String,Map<String,UserInfo>>(); Map<String,UserInfo> innerMap = new TreeMap<String,UserInfo>(); 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<String,UserInfo>(); 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);}<s:iterator value="map" var="var"> <s:iterator value="value"> <s:property value="#var.key"/> <s:property value="key"/> <s:property value="value.username"/> <s:property value="value.password"/> <s:property value="value.roleInfo.rolename"/><br> </s:iterator></s:iterator> 1 1
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