Struts2 页面获取参数 List,Set,Map 及调用函数和实例化对象
相应的action，在action中实例化了许多需要传递给客户端的参数
public class OgnlAction extends ActionSupport { private Cat cat = new Cat(); private Map<String, Dog> dogMap = new HashMap<String, Dog>(); private Set<Dog> dogs = new HashSet<Dog>(); private String password; private User user = new User(); private String username; private List<User> users = new ArrayList<User>(); public OgnlAction() { users.add(new User(1)); users.add(new User(2)); users.add(new User(3)); dogs.add(new Dog("dog1")); dogs.add(new Dog("dog2")); dogs.add(new Dog("dog3")); dogMap.put("dog100", new Dog("dog100")); dogMap.put("dog101", new Dog("dog101")); dogMap.put("dog102", new Dog("dog102")); } public String execute() { System.out.println(user.toString()); return SUCCESS; } public Cat getCat() { return cat; } public Map<String, Dog> getDogMap() { return dogMap; } public Set<Dog> getDogs() { return dogs; } public String getPassword() { return password; } public User getUser() { return user; } public String getUsername() { return username; } public List<User> getUsers() { return users; } public String m() { return "hello"; } public void setCat(Cat cat) { this.cat = cat; } public void setDogMap(Map<String, Dog> dogMap) { this.dogMap = dogMap; } public void setDogs(Set<Dog> dogs) { this.dogs = dogs; } public void setPassword(String password) { this.password = password; } public void setUser(User user) { this.user = user; } public void setUsername(String username) { this.username = username; } public void setUsers(List<User> users) { this.users = users; } }
服务区相关的实体类对象和工具类
public class Cat { private Dog friend; public Dog getFriend() { return friend; } public void setFriend(Dog friend) { this.friend = friend; } public String miaomiao() { return "miaomiao"; } }
public class Dog { private String name; public Dog() { } public Dog(String name) { super(); this.name = name; } public String getName() { return name; } public void setName(String name) { this.name = name; } @Override public String toString() { return "dog: " + name; } }
public class User { private int age = 8; public User() { } public User(int age) { super(); this.age = age; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "user" + age; } }
public class S { public static String STR = "STATIC STRING"; public static String s() { return "static method"; } }
客户端页面获取参数
<body> <ol> <li>访问值栈中的action的普通属性: username = <s:property value="username"/> </li> <li>访问值栈中对象的普通属性(get set方法)：<s:property value="user.age"/> | <s:property value="user['age']"/> | <s:property value="user[\"age\"]"/> | wrong: <%--<s:property value="user[age]"/>--%></li> <li>访问值栈中对象的普通属性(get set方法): <s:property value="cat.friend.name"/></li> <li>访问值栈中对象的普通方法：<s:property value="password.length()"/></li> <li>访问值栈中对象的普通方法：<s:property value="cat.miaomiao()" /></li> <li>访问值栈中action的普通方法：<s:property value="m()" /></li> <hr /> <li>访问静态方法：@com.yao.action.ognl.S@s() <s:property value="@com.yao.action.ognl.S@s()"/></li> <li>访问静态属性：@com.yao.action.ognl.S@STR <s:property value="@com.yao.action.ognl.S@STR"/></li> <li>访问Math类的静态方法：@@max(2,3) <s:property value="@@max(2,3)" /></li> <hr /> <s:set name="user1" value="new com.yao.action.ognl.User(9)" scope="request"></s:set> <li>创建一个对象，访问对象:<s:property value="#request.user1.toString()"/>|${user1.age}<br></li> <li>访问普通类的构造方法：new com.yao.action.ognl.User(8) <s:property value="new com.yao.action.ognl.User(8)" /></li> <hr /> <li>访问List:<s:property value="users"/></li> <li>访问List中某个元素:<s:property value="users[1]"/></li> <li>访问List中元素某个属性的集合:<s:property value="users.{age}"/></li> <li>访问List中元素某个属性的集合中的特定值:<s:property value="users.{age}[0]"/> | <s:property value="users[0].age"/></li> <li>访问Set:<s:property value="dogs"/></li> <li>访问Map:<s:property value="dogMap"/></li> <li>访问Map中某个元素:<s:property value="dogMap.dog101"/> | <s:property value="dogMap['dog101']"/> | <s:property value="dogMap[\"dog101\"]"/></li> <li>访问Map中所有的key:<s:property value="dogMap.keys"/></li> <li>访问Map中所有的value:<s:property value="dogMap.values"/></li> <li>访问容器的大小：<s:property value="dogs.size()"/> | <s:property value="dogMap.size()"/> | <s:property value="users.size"/> </li> <hr /> <li>投影(过滤)：<s:property value="users.{?#this.age==1}[0]"/></li> <li>投影：<s:property value="users.{^#this.age>1}"/></li> <li>投影：<s:property value="users.{$#this.age>1}.{age}"/></li> <li>投影：<s:property value="users.{$#this.age>1}.{age} == null"/></li> <hr /> <!-- 获取参数值 --> <li>[]:<s:property value="[0].username"/></li> <li>[]:<s:property value="[0].password"/></li> </ol> <s:debug></s:debug> </body>
