struts 复习1(速动画)

最新推荐文章于 2020-11-03 17:37:32 发布

原创最新推荐文章于 2020-11-03 17:37:32 发布 · 284 阅读

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#struts #import #html #action #string #properties

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本文介绍了一个基于Struts框架实现的简单HelloWorld示例，包括ActionForm类的定义、验证逻辑及JSP页面展示等内容，展示了Struts框架的基本使用方法。

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 *.properties 配置 jsp.hello.title=hello world!!!! jsp.hello.error=This is error!
ActionForm 
 
package com.yourcompany.struts.form; 
import javax.servlet.http.HttpServletRequest; 
import org.apache.struts.action.ActionError; 
import org.apache.struts.action.ActionErrors;
 import org.apache.struts.action.ActionForm; 
import org.apache.struts.action.ActionMapping;
 public class HelloForm extends ActionForm 
{ 
private String userName;

  public ActionErrors validate(ActionMapping mapping, HttpServletRequest request)
 {
   ActionErrors errors=new ActionErrors();  
   if((userName==null)||(userName.length()<1))  
   {   
   errors.add("userName",new ActionError("jsp.hello.error"));   
    }  
  return errors; 
  }

  public void reset(ActionMapping mapping, HttpServletRequest request) 
 {   
  this.userName=null;    
  } 
  public String getUserName() 
  { 
   return userName; 
  } 
  public void setUserName(String userName)
  { 
  this.userName = userName;  
  }
 }

Action就是加了一个mapping package com.yourcompany.struts.action; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.struts.action.Action; import org.apache.struts.action.ActionForm; import org.apache.struts.action.ActionForward; import org.apache.struts.action.ActionMapping; import com.yourcompany.struts.form.HelloForm; public class HelloAction extends Action {

public ActionForward execute(ActionMapping mapping, ActionForm

form, HttpServletRequest request,

HttpServletResponse response) { HelloForm helloForm = (HelloForm) form;// TODO Auto-

generated method stub return mapping.findForward("Hello"); } }

jsp <%@ page language="java" pageEncoding="ISO-8859-1"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"

prefix="bean"%> <%@ taglib uri="http://jakarta.apache.org/struts/tags-html" prefix="html"%> <html> <head> <title>JSP for HelloForm form</title> </head> <body> <html:form action="/hello"> userName : <html:text

property="userName"/><html:errors property="userName"/><br/> <html:submit/><html:cancel/> </html:form> </body> </html>