java Struts2中Action自动接收参数

Struts2中Action接收参数的方法主要有以下三种:

1.使用Action的属性接收参数:(通过属性驱动式)
a.定义:在Action类中定义属性,创建get和set方法;
b.接收:通过属性接收参数,如:userName;
c.发送:使用属性名传递参数,如:user1!add?userName=Magci;

JSP:
<form action=”sys/login.action” method=”post”>
<input type=”text” name=”username”>
<input type=”submit” value=”submit”>
</form>

Action:直接通过get、set方法获取。
public class sysAction extends ActionSupport{
private String username;

public String login() throws Exception {
System.out.println(username);
return SUCCESS;
}

public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username= username;
}
}

2.使用ModelDriven接收参数:(模型驱动方式,必须要实现ModelDriven<T>接口。对于要传入多个model第二种方式不方便)
a.定义:Action实现ModelDriven泛型接口,定义Model类的对象(必须new),通过getModel方法返回该对象;
b.接收:通过对象的属性接收参数,如:user.getUserName();
c.发送:直接使用属性名传递参数,如:user2!add?userName=MGC

JSP:
<form action=”sys/login.action” method=”post”>
<input type=”text” name=”username”>
<input type=”submit” value=”submit”>
</form>

Action:必须实现getModel() 方法
public class sysAction extends ActionSupport implements ModelDriven<User>{
private User user;

public String login() throws Exception {
System.out.println(getModel().getUsername());
return SUCCESS;
}

public User getModel() {
if (null == user) {
return user = new User();
}
return user;
}
}

3.使用DomainModel接收参数:(第三种领域模型方式可以完全不实现ModelDriven<T>,也可使用多个model对象的属性。)
a.定义:定义Model类,在Action中定义Model类的对象(不需要new),创建该对象的get和set方法;
b.接收:通过对象的属性接收参数,如:user.getUserName();
c.发送:使用对象的属性传递参数,如:user2!add?user.userName=MGC;

JSP:
<form action=”sys/login.action” method=”post”>
<input type=”text” name=”user.username”>
<input type=”text” name=”teacher.level”>
<input type=”submit” value=”submit”>
</form>

Action: 必须提供set方法
public class sysAction extends ActionSupport{
private User user;
private Teacher teacher;

public String login() throws Exception {
System.out.println(user.getUsername());
System.out.println(teacher.getLevel());
return SUCCESS;
}

public void setUser(User user) {
this.user = user;
}
public void setTeacher(Teacher teacher) {
this.teacher = teacher;
}
}

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