如果为action配置了类，那么默认就会执行Action类的excute方法，Action类的写法三种：
①
public class Action1 {
public String execute(){
return "abc";//根据返回结果，去xml文件中找name与之匹配的result
}
}
②
import com.opensymphony.xwork2.Action;//ActionSupport类实现了该接口
public class Action2 implements Action {
@Override
public String execute() throws Exception {
// TODO Auto-generated method stub
return "success";
}
}
③
import com.opensymphony.xwork2.ActionSupport;
public class Action3 extends ActionSupport {
@Override
public String execute(){
// TODO Auto-generated method stub
return "success";
}
}
推荐使用第三种。
调用Action类的指定方法可以在xml中配置（以下文件三处蓝字代表三种方法）：
struts.xml：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">
<struts>
<constant name="struts.devMode" value="true" />
<constant name="struts.i18n.encoding" value="GBK" /> <!-- internationalization -->
<package name="front" namespace="/" extends="struts-default">
<action name="hello"><!-- 当不配置class的时候，会调用默认的ActionSupport类 (xwork框架中的类)-->
<result>
/Hello.jsp
</result>
</action>
<action name="act1" class="test.Action1">
<result name="success">/ActionS.jsp</result>
<result name="failure">/ActionF.jsp</result>
<result name="abc">/Hello.jsp</result>
</action>
<action name="act2" class="test.Action2">
<result name="success">/ActionS.jsp</result>
<result name="failure">/ActionF.jsp</result>
<result name="abc">/Hello.jsp</result>
</action>
</package>
<package name="user" extends="struts-default" namespace="/user">
<action name="userAdd" class="test.UserAction"method="add">
<!--
调用方法由execute改为add方法，在jsp页面中链接后边加上!add也可以达到同样效果。推荐后者。
后者又称DMI Dynamic Method Invoke 动态方法调用
在jsp中写法例子：
<% String context = request.getContextPath(); %>
<a href="<%=context %>/user/user!add">添加用户</a>
-->
<result>/userAddSuccess.jsp</result>
</action>
</package>
<!-- 通配符示例，使用通配符要遵守“约定优于配置”的原则 –>
<!-- 关于*号的匹配：如果地址栏中的action名在配置文件中找不到同名的action名，
则对有*号的可以匹配的action名，优先匹在配置文件中书写位置靠上的action -->
<package name="actions" extends="struts-default" namespace="/actions">
<action name="Student*" class="test.struts2.action.StudentAction" method="{1}">
<result>/Student{1}_success.jsp</result>
</action>
<!-- {1}就代表name中的第一个*，以此类推 -->
<action name="*_*" class="test.struts2.action.{1}Action" method="{2}">
<result>/{1}_{2}_success.jsp</result>
<!-- {0}_success.jsp -->
</action>
</package>
</struts>
使用Action类中指定的方法如果需要参数有以下三种方式：
①
直接在jsp的链接中写：“/user!add?name=a&age=8”就可以把参数传递到下面的Action中
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport {
private String name;
private int age;
public String add() {
System.out.println("name=" + name);
System.out.println("age=" + age);
return SUCCESS;
}
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;
}
}
②
使用Domain Model接收参数<a href="user/user!add?user.name=a&user.age=8">添加用户</a>
这种方式对应的Action：
import com.bjsxt.struts2.user.model.User;
import com.opensymphony.xwork2.ActionSupport;
public class UserAction extends ActionSupport {
private User user;
//private UserDTO userDTO;
public String add() {
System.out.println("name=" + user.getName());
System.out.println("age=" + user.getAge());
return SUCCESS;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
public class User {
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;
}
}
③
使用ModelDriven接收参数<a href="user/user!add?name=a&age=8">添加用户</a>
也可以用下面的Action
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
public class UserAction extends ActionSupport implements ModelDriven<User>{//此处要指定清楚
private User user = new User(); //需要自己new
public String add() {
System.out.println("name=" + user.getName());
System.out.println("age=" + user.getAge());
return SUCCESS;
}
@Override
public User getModel() {
return user;
}
}
public class User {
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;
}
}