struts2 Action接收参数的方法

先看GetRequestParameterAction类代码：

public class GetRequestParameterAction extends ActionSupport {         private String bookName;       private String bookPrice;              public String getBookName() {           return bookName;       }         public void setBookName(String bookName) {           this.bookName = bookName;       }         public String getBookPrice() {           return bookPrice;       }         public void setBookPrice(String bookPrice) {           this.bookPrice = bookPrice;       }                     public String  execute() throws Exception{                                 //方式一： 将参数作为Ａction的类属性，让OGNL自动填充                       System.out.println("方法一，把参数作为Action的类属性,让OGNL自动填充：");           System.out.println("bookName: "+this.bookName);           System.out.println("bookPrice: " +this.bookPrice);                                 //方法二:在Action中使用ActionContext得到parameterMap获取参数:           ActionContext context=ActionContext.getContext();           Map  parameterMap=context.getParameters();                      String bookName2[]=(String[])parameterMap.get("bookName");           String bookPrice2[]=(String[])parameterMap.get("bookPrice");                      System.out.println("方法二，在Action中使用ActionContext得到parameterMap获取参数：");           System.out.println("bookName: " +bookName2[0]);           System.out.println("bookPrice: " +bookPrice2[0]);                                 //方法三:在Action中取得HttpServletRequest对象，使用request.getParameter获取参数           HttpServletRequest request = (HttpServletRequest)context.get(ServletActionContext.HTTP_REQUEST);                        String bookName=request.getParameter("bookName");           String bookPrice=request.getParameter("bookPrice");                      System.out.println("方法三，在Action中取得HttpServletRequest对象，使用request.getParameter获取参数：");           System.out.println("bookName: " +bookName);           System.out.println("bookPrice: " +bookPrice);           return SUCCESS;                  }     }  

总结：

方法一：当把参数作为Action的类属性，且提供属性的getter/setter方法时，xwork的OGNL会自动把request参数的值设置到类属性中，此时访问请求参数只需要访问类属性即可。

方法二：可以通过ActionContext对象Map parameterMap=context.getParameters();方法，得到请求参数Map，然后通过parameterMap来获取请求参数。需要注意的是：当通过parameterMap的键取得参数值时，取得是一个数组对象，即同名参数的值的集合。

方法三：通过ActionContext取得HttpServletRequest对象，然后使用request.getParameter("参数名")得到参数值。

Struts2中Action接收参数的方法主要有以下三种：
1.使用Action的属性接收参数：

a.定义：在Action类中定义属性，创建get和set方法；
b.接收：通过属性接收参数，如：userName；
c.发送：使用属性名传递参数，如：user1!add?userName=Magci；

2.使用DomainModel接收参数：

a.定义：定义Model类，在Action中定义Model类的对象（不需要new），创建该对象的get和set方法；
b.接收：通过对象的属性接收参数，如：user.getUserName()；
c.发送：使用对象的属性传递参数，如：user2!add?user.userName=MGC；

3.使用ModelDriven接收参数：

a.定义：Action实现ModelDriven泛型接口，定义Model类的对象（必须new），通过getModel方法返回该对象；
b.接收：通过对象的属性接收参数，如：user.getUserName()；

c.发送：直接使用属性名传递参数，如：user2!add?userName=MGC；

实例：

web.xml:

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"     xmlns="http://java.sun.com/xml/ns/javaee"     xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xsi:schemaLocation="http://java.sun.com/xml/ns/javaee     http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <welcome-file-list>    <welcome-file>hello.jsp</welcome-file>  </welcome-file-list>  <filter>    <filter-name>struts2</filter-name>    <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>  </filter>  <filter-mapping>    <filter-name>struts2</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping></web-app>

struts.xml:

<?xml version="1.0" encoding="UTF-8" ?><!DOCTYPE struts PUBLIC"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN""http://struts.apache.org/dtds/struts-2.0.dtd"><struts><!-- <constant name="struts.enable.DynamicMethodInvocation" value="false" /><constant name="struts.devMode" value="false" /><include file="example.xml"/><package name="default" namespace="/" extends="struts-default"><default-action-ref name="index" /><action name="index"><result type="redirectAction"><param name="actionName">HelloWorld</param><param name="namespace">/example</param></result></action></package>--><!-- Add packages here --><constant name="struts.devMode" value="true" /><package name="user" namespace="/" extends="struts-default"><action name="user*" class="cn.edu.ahau.mgc.struts2.action.UserAction{1}"><result>/addSuccess.jsp</result></action></package></struts>

User.java:

package cn.edu.ahau.mgc.struts2.mode;public class User {    private String userName;    private String password;        public String getUserName() {        return this.userName;    }        public void setUserName(String userName) {        this.userName = userName;    }        public String getPassword() {        return this.password;    }        public void setPassword(String password) {        this.password = password;    }}

UserAction1.java:

package cn.edu.ahau.mgc.struts2.action;import com.opensymphony.xwork2.ActionSupport;public class UserAction1 extends ActionSupport {private String userName;private String password;public String add() {System.out.println("userName: " + userName);System.out.println("password: " + password);return SUCCESS;}public String getUserName() {return this.userName;}public void setUserName(String userName) {this.userName = userName;}public String getPassword() {return this.password;}public void setPassword(String password) {this.password = password;}}

UserAction2.java:

package cn.edu.ahau.mgc.struts2.action;import com.opensymphony.xwork2.ActionSupport;import cn.edu.ahau.mgc.struts2.mode.User;public class UserAction2 extends ActionSupport {private User user;public String add() {System.out.println("userName: " + user.getUserName());System.out.println("password: " + user.getPassword());return SUCCESS;}public User getUser() {return this.user;}public void setUser(User user) {this.user = user;}}

UserAction3.java:

package cn.edu.ahau.mgc.struts2.action;import cn.edu.ahau.mgc.struts2.mode.User;import com.opensymphony.xwork2.ActionSupport;import com.opensymphony.xwork2.ModelDriven;public class UserAction3 extends ActionSupport implements ModelDriven<User> {private User user = new User();public String add() {System.out.println("userName: " + user.getUserName());System.out.print("password: " + user.getPassword());return SUCCESS;}public User getModel() {return this.user;}}

index.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><base href="<%=basePath%>"><title>Param</title><meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">--></head><body><a href="user1!add?userName=Magci&password=123456">user1!add?userName=Magci&password=123456</a><br /><br /><a href="user2!add?user.userName=MGC&user.password=abc">user2!add?user.userName=MGC&user.password=abc</a><br /><br /><a href="user3!add?userName=MaGC&password=000000">user3!add?userName=MaGC&password=000000</a></body></html>

addSuccess.jsp:

<%@ page language="java" import="java.util.*" pageEncoding="GB18030"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>AddSuccess</title>    <meta http-equiv="pragma" content="no-cache">    <meta http-equiv="cache-control" content="no-cache">    <meta http-equiv="expires" content="0">        <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">    <meta http-equiv="description" content="This is my page">    <!--    <link rel="stylesheet" type="text/css" href="styles.css">    -->  </head>    <body>    User Add Success! <br>  </body></html>

参考链接：

http://waynerqiu.com/1/102.html