<form action="${pageContext.request.contextPath }/testAttribute.action" method="post"><label>用户名：</label><input type="text" name="username"><br><label>密码：</label><input type="password" name="password"><br><input type="submit" value="提交">
</form>

public class TestAttributeAction extends ActionSupport {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;}@Overridepublic String execute() throws Exception {System.out.println(this.getUsername()+","+this.getPassword());return NONE;}
}

模型驱动ModelDriven（推荐使用）

public class User implements Serializable {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;}
}

public class TestModelAction extends ActionSupport implements ModelDriven<User> {private User user = new User();@Overridepublic User getModel() {// TODO Auto-generated method stubreturn user;}@Overridepublic String execute() throws Exception {System.out.println(user.getUsername() + "," + user.getPassword());return SUCCESS;}
}

这是我的理解，多多见谅。