有了前几篇的基础,相信大家对于Struts2已经有了一个很不错的认识,本篇我将为大家介绍一些关于Action接收参数的三种形式,以及简单的表单验证实现,下面进入正题,首先我们一起先来了解一下最基本的Action接收参数的形式,直接在我们的Action类中添加成员变量,这样就可以完成Action接收参数的操作,具体内容详见代码展示:
这里我们以登录验证为例,进行代码展示,首先是我们的Action类:
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/*** * 最基本的接收参数形式 * @author jho * http://localhost:8080/Struts3/index!login?name="123"&password="456" */ @SuppressWarnings ( "serial" ) public class User extends ActionSupport { private String name; private int pwd; public String getName() { return name; } public void setName(String name) { this .name = name; } public int getPwd() { return pwd; } public void setPwd( int pwd) { this .pwd = pwd; } public String login(){ System.out.println( "name=" +name+ " Pwd=" +pwd); if ( 123456 ==pwd){ return SUCCESS; } else { return ERROR; } } } |
下面我们一起来看一下Action的第二种接收参数的形式,通过User类对象来完成整个的参数接收,首先我们创建一个User类:
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public class User { 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; } } |
然后通过User对象在Action中进行用户提交参数的接收:
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/*** * Dormain Model * @author jho * http://localhost:8080/Struts4/index!login?user.name="123"&user.password="456" */ @SuppressWarnings ( "serial" ) public class UserAction extends ActionSupport { private User user; public User getUser() { return user; } public void setUser(User user) { this .user = user; } public String login(){ System.out.println( "name=" +user.getName()+ " Pwd=" +user.getPassword()); return SUCCESS; } } |
最后是通过Struts的ModelDriven<User>来进行用户参数的接收,第一步创建我的User类对象,第二部配置我们的Action:
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/*** * Model Driven * @author jho * http://localhost:8080/Struts5/index!login?name="123"&password="456" */ @SuppressWarnings ( "serial" ) public class UserAction extends ActionSupport implements ModelDriven<User>{ private User user = new User(); public String login(){ System.out.println( "name=" +user.getName()+ " Pwd=" +user.getPassword()); return SUCCESS; } public User getModel() { return user; } } |
所谓ModelDriven,意思是直接把实体类当成页面数据的收集对象。
对于简单的表单验证知识,就为大家介绍一下addFieldError()方法:
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@SuppressWarnings ( "serial" ) public class InputErrorFilter extends ActionSupport{ private String name; public String getName() { return name; } public void setName(String name) { this .name = name; } @Override public String execute() throws Exception { return SUCCESS; } public String login(){ System.out.println(name+ "" ); if (name!= null && name.equals( "hpu" )){ return SUCCESS; } else { this .addFieldError( "nameError" , "用户名输入有误" ); this .addFieldError( "nameError" , "ul li形式输出错误信息" ); return ERROR; } } } |
我们的错误处理页面:
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<%@ page language= "java" import = "java.util.*" pageEncoding= "utf-8" %> <% String path = request.getContextPath(); String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ; %> <% @taglib uri= "/struts-tags" prefix= "s" %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" > <html> <head> <base href= "<%=basePath%>" rel= "external nofollow" > <title>My JSP 'error.jsp' starting page</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" rel= "external nofollow" > --> </head> <body> 操作失败 <br> 输入参数:<s:text name= "name" /><br/> <s:fielderror fieldName= "nameError" theme= "simple" /><br/> <s:property value= "errors.nameError[0]" /><br/> <s:debug></s:debug> </body> </html> |
以上所述是小编给大家介绍的Struts2中Action三种接收参数形式与简单的表单验证功能,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!
原文链接:http://www.cnblogs.com/AndroidJotting/p/6516752.html