先奉上简易demo一份：

Validate.java
public class Validate extends ActionSupport {
private String name;    
private int age;
public String getName() {        return name;    } 
public void setName(String name) {        this.name = name;    }
public int getAge() {        return age;    }
public void setAge(int age) {        this.age = age;    }

public String execute(){    return "success";    }
 }
Vlidate-validtion.xml