Struts ---Action的方式

1.无侵入的

public String execute() {

	System.out.println("HelloWord--Action");
	if ("liuxin".equals(username) && "123456".equals(password)) {
		// username。equals("liuxin")当username为空时没有equals方法，会出现空指针异常
		return "success";
	} else
		return "failture";}

2.实现Action接口

public class LoginAction implements Action {
	


	public String execute() {

		return SUCCESS;
	}



}

3.继承ActionSupport

public class LoginAction extends ActionSupport {
	
	private static final long serialVersionUID = 1L;

	public String login() {
		return LOGIN;
	}

	public String execute() {

		return SUCCESS;
	}

	public String add() {

		return ERROR;
	}

}