定义Action类的三种方式

1.重写execute方法：

public class IndexAction1 {
	public String execute() {
		return "success";
	}
}

2.实现Action接口：

public class IndexAction2 implements Action {
	@Override
	public String execute() {
		return "success";
	}
}

3.继承ActionSupport类

public class IndexAction3 extends ActionSupport {
 
 	 @Override
 	 public String execute() {
 	 return "success";
 }
}