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。