最近在项目中发现在jsp页面上遍历集合还有这种写法：
?
personlist为List<Person>,遍历时过滤掉name属性为“jack”的元素：
<s:iterator value="personList.{?!name.equals(\"jack\")}">
<s:property value="name"/>---
<s:property value="password"/>
</s:iterator>
?persons为Set<Person>,遍历时只取第一个元素：
<s:iterator value="persons.{?1==1}[0]">
<s:property value="name"/>---
<s:property value="password"/><br/>
</s:iterator>
?
?Person类为：
public class Person {
private String name;
private String password;
public Person(String name,String password){
this.name = name;
this.password = password;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}
?
?
?
?Action为：
public class TestAction extends ActionSupport {
private List<Person> personList;
private Set<Person> persons;
public List<Person> getPersonList() {
return personList;
}
public void setPersonList(List<Person> personList) {
this.personList = personList;
}
public Set<Person> getPersons() {
return persons;
}
public void setPersons(Set<Person> persons) {
this.persons = persons;
}
@Override
public String execute() throws Exception {
personList = new ArrayList<Person>();
personList.add(new Person("jack","1111"));
personList.add(new Person("jack1","2222"));
personList.add(new Person("jack2","3333"));
personList.add(new Person("jack3","4444"));
personList.add(new Person("jack4","5555"));
persons = new HashSet<Person>();
persons.add(new Person("jack","1111"));
persons.add(new Person("jack1","2222"));
persons.add(new Person("jack2","3333"));
persons.add(new Person("jack3","4444"));
persons.add(new Person("jack4","5555"));
//下面两行代码是将集合放入栈上下文中
//ActionContext.getContext().put("personList", personList);
//ActionContext.getContext().put("persons", persons);
return Action.SUCCESS;
}
}
??