Struts2表单数据接收方式
1.将Action类作为一个POJO,直接进行接收
在Action类内部定义字段名称,并为之声明get/set方法。页面表单name属性与定义字段名称相同。
package com.common.login; import com.opensymphony.xwork2.ActionSupport; @SuppressWarnings("serial") public class LoginAction extends ActionSupport{ private String name; private String password; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } public void showInfo() { System.out.println("name:"+this.name+" password"+this.password); } }
jsp页面代码
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Login Page</title> </head> <body> <form action="/struts_web/common/login!login" method="post"> <s:textfield name="name" label="name"></s:textfield> <s:password name="password" label="password"></s:password> <s:submit label="submit"></s:submit> </form> </body> </html>
2.定义一个Bean对象,通过Bean进行传递接收
上述方法是最常用的一种方式,但是这个方法有个缺点:当属性较多时,Action类显得比较臃肿。
第二种方法需要我们定义一个DTO对象(普通的JavaBean)
package com.common.login; public class UserBean { private String name; private String password; public void setName(String name) { this.name = name; } public String getName() { return name; } public void setPassword(String password) { this.password = password; } public String getPassword() { return password; } }
然后将该DTO对象组合到Action中,声明相应的get/set方法
package com.common.login; import com.opensymphony.xwork2.ActionSupport; @SuppressWarnings("serial") public class LoginAction extends ActionSupport{ private UserBean bean; public UserBean getBean() { return bean; } public void setBean(UserBean bean) { this.bean = bean; } public void showInfo() { System.out.println("name:"+bean.getName()+" password"+bean.getPassword()); } }
此时页面应该修改为
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Login Page</title> </head> <body> <form action="/struts_web/common/login!login" method="post"> <s:textfield name="bean.name" label="name"></s:textfield> <s:password name="bean.password" label="password"></s:password> <s:submit label="submit"></s:submit> </form> </body> </html>
3.使用Struts2的ModelDriven模式进行传递
第二种方式提供了一个比较简洁的表单数据接收方式,但是Action类是变得简洁了,但是页面变得相对复杂了许多。
下面提供一种ModelDriven模式的解决方案
使用ModelDriven方式,首先要实现ModelDriven接口和getModel方法
package com.common.login; import com.opensymphony.xwork2.ActionSupport; import com.opensymphony.xwork2.ModelDriven; @SuppressWarnings("serial") public class LoginAction extends ActionSupport implements ModelDriven<UserBean>{ private UserBean bean; @Override public UserBean getModel() { if(bean==null) { bean = new UserBean(); } return bean; } public void showInfo() { System.out.println("name:"+bean.getName()+" password"+bean.getPassword()); } }<span style="font-size:18px;"> </span>
页面就可以改回一开始的处理方式
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <%@ taglib prefix="s" uri="/struts-tags" %> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Login Page</title> </head> <body> <form action="/struts_web/common/login!login" method="post"> <s:textfield name="name" label="name"></s:textfield> <s:password name="password" label="password"></s:password> <s:submit label="submit"></s:submit> </form> </body> </html><span style="font-size:18px;"> </span>
注意:当返回result前对业务对象修改了,但是值栈中对应的对象依然是之前的就值,若想在返回result之前刷新值栈中业务对象各个属性的根对象,需在该action中配置如下参数:
<action name="login" class="com.common.login.LoginAction"> <interceptor-ref name="defaultStack"> <param name="modelDriven.refreshModelBeforeResult">true</param> </interceptor-ref> <result name="login">/pages/common/login/login.jsp</result> <result name="success">/pages/common/login/success.jsp</result> <result name="error">/pages/common/login/error.jsp</result> </action>