关于webwqrk2中form提交是点击哪个提交按钮的判定

public class MyAction extends ActionSupport { 

    /** 
     * Action implementation 
     * 
     * Sets the message according to which button was pressed. 
     **/ 
    public String execute(); { 
        if (buttonOnePressed); { 
            message="You pressed the first button"; 
        } else if (buttonTwoPressed); { 
            message="You pressed the second button"; 
        } else { 
            return ERROR; 
        } 
        return SUCCES; 
    } 

    // Input parameters 
    private boolean buttonOnePressed=false; 
    private boolean buttonTwoPressed=false; 

    public void setButtonOnePressed(); { 
        this.buttonOnePressed = true; 
    } 


    public void setButtonTwoPressed(); { 
        this.buttonTwoPressed = true; 
    } 

    // Output parameters 

    private String message; 
    public String getMessage(); { 
        return message; 
    } 
}