Struts2中Action接收传递的参数

Struts2中Action接收传递的参数有 三种方式：

1.用Action的属性接收参数：

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<constant name="struts.enable.DynamicMethodInvocation" value="true" />
<constant name="struts.devMode" value="true" />
<package name="font" namespace="/user" extends="struts-default">

<action name="user" class="com.zhang.HelloAction">
<result >
/Studentadd_success.jsp
</result>
</action>

</package>
</struts>

HelloAction.java

package com.zhang;

import com.opensymphony.xwork2.ActionSupport;

public class HelloAction extends ActionSupport
{
private String name;
private int age;

public String add()
{
System.out.println("name="+name);
System.out.println("age="+age);
return SUCCESS;
}

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public int getAge()
{
return age;
}

public void setAge(int age)
{
this.age = age;
}

}

步骤：

     .定义：在Action类中定义属性，创建get和set方法；

      访问：使用属性名传递参数，如：http://localhost:8080/Struts2_03/user/user!add?name=aa&age=10

2.用DomainModel接收参数：

HelloAction.java

package com.zhang;

import com.opensymphony.xwork2.ActionSupport;

public class HelloAction extends ActionSupport
{
private User user;

public String add()
{
System.out.println("name="+user.getName());
System.out.println("age="+user.getAge());
return SUCCESS;
}

public User getUser()
{
return user;
}

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

User.java

package com.zhang;

public class User
{
private String name;
private int age;

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public int getAge()
{
return age;
}

public void setAge(int age)
{
this.age = age;
}
}

步骤：

       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；

      接收：通过对象的属性接收参数，如：user.getName()；

      访问：使用对象的属性传递参数，如：http://localhost:8080/Struts2_04/user/user!add?user.name=a&user.age=10

3.用ModelDriven接收参数

HelloAction.java

package com.zhang;

import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;

public class HelloAction extends ActionSupport implements ModelDriven<User>
{
private User user = new User();

public String add()
{
System.out.println("name="+user.getName());
System.out.println("age="+user.getAge());
return SUCCESS;
}

public User getModel()
{
return user;
}
}

User.java

package com.zhang;

public class User
{
private String name;
private int age;

public String getName()
{
return name;
}

public void setName(String name)
{
this.name = name;
}

public int getAge()
{
return age;
}

public void setAge(int age)
{
this.age = age;
}
}

步骤

        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；

        访问：直接使用属性名传递参数，如：http://localhost:8080/Struts2_04/user/user!add?name=a&age=10