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struts接收表单数据的3种方式
一、普通属性
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>
二、领域对象
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
[java] view plain copy
- 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
[html] view plain copy
- <%@ 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>
三、模型驱动
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
[java] view plain copy
- 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
[html] view plain copy
- <%@ 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:
[html] view plain copy
- <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>
struts接收表单数据的3种方式
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