Struts2接收参数的几种方式

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。