Struts2接收参数的几种方式详解编程语言

一、用Action属性

在action里定义要接收的参数，并提供相应的set和get方法。

如：

public class LoginAction extends ActionSupport { 
    private String username; 
    private String password; 
     
    //对应的get set方法 
    public String getUsername() { 
        return username; 
    } 
    public void setUsername(String username) { 
        this.username = username; 
    } 
    public String getPassword() { 
        return password; 
    } 
    public void setPassword(String password) { 
        this.password = password; 
    } 
    public String execute() { 
        // TODO Auto-generated method stub 
        System.out.println("username = "+username); 
        System.out.println("password = "+password); 
        return SUCCESS; 
    } 
}

<form action="login" method="post"> 
        用户名:<input type="text" name="username"><br/> 
        密 码：<input type="password" name="password"><br/> 
        <input type="submit" value="提交"> 
    </form>

二、使用DomainModel

如果Action中属性过多，则可以Model保存为一个对象，并提供get和set

Model类

public class User { 
    private String username; 
    private String password; 
     
    public String getUsername() { 
        return username; 
    } 
    public void setUsername(String username) { 
        this.username = username; 
    } 
    public String getPassword() { 
        return password; 
    } 
    public void setPassword(String password) { 
        this.password = password; 
    } 
}

Action类

public class LoginAction extends ActionSupport { 
    private User user; 
    public String execute() { 
        // TODO Auto-generated method stub 
        System.out.println("username = "+user.getUsername()); 
        System.out.println("password = "+user.getPassword()); 
        return SUCCESS; 
    } 
    public User getUser() { 
        return user; 
    } 
    public void setUser(User user) { 
        this.user = user; 
    } 
}

JSP

<form action="login" method="post"> 
        用户名:<input type="text" name="user.username"><br/> 
        密 码：<input type="password" name="user.password"><br/> 
        <input type="submit" value="提交"> 
    </form>

三、使用ModelDriven（模型驱动）

使用模型驱动模式时，Acton必须实现ModelDriven接口，实现该接口则必须实现getModel()方法，该方法用于把Action和与之对应的Model实例关联起来。

Model类同DomainModel

Action类

public class LoginAction extends ActionSupport implements ModelDriven<User> { 
    private User user = new User();   //需实例化 
    public String execute() { 
        // TODO Auto-generated method stub 
        System.out.println("username = "+user.getUsername()); 
        System.out.println("password = "+user.getPassword()); 
        return SUCCESS; 
    } 
    public User getUser() { 
        return user; 
    } 
    public void setUser(User user) { 
        this.user = user; 
    } 
    public User getModel() { 
        // TODO Auto-generated method stub 
        return user; 
    } 
}

JSP

<form action="login" method="post"> 
        <!-- 属性可以为 对象.XXX 也可以直接为XXX  则前提Action中要自己实例化Model对象 --> 
        用户名:<input type="text" name="user.username"><br/> 
        密 码：<input type="password" name="password"><br/> 
        <input type="submit" value="提交"> 
    </form>

四、使用request接收参数

此方法和传统的JSP页面接收参数一样，用request.getParameter(“”)方法。