ajax无刷新技术

最新推荐文章于 2023-09-26 21:37:18 发布

heguikun

最新推荐文章于 2023-09-26 21:37:18 发布

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文章标签： ajax string exception sql dwr include

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ajax无刷新技术

author：heguikun
1首先在项目的lib目录下添加dwr.jar 包

2在web.xml 写dwr的配置，如下：
<servlet>
<servlet-name>dwr</servlet-name>
<servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
<init-param>
<param-name>debug</param-name>
<param-value>true</param-value>
</init-param>
</servlet>
<servlet-mapping>
<servlet-name>dwr</servlet-name>
<url-pattern>/dwr/*</url-pattern>
</servlet-mapping>

--------------------------------------
3.添加dwr.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 2.0//EN"

"http://www.getahead.ltd.uk/dwr/dwr20.dtd">

4.写暴转换为脚本的bean

package biz.impl.dwrPackge;
import java.util.List;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import org.directwebremoting.WebContext;
import org.directwebremoting.WebContextFactory;
import org.springframework.context.ApplicationContext;
import org.springframework.web.context.support.WebApplicationContextUtils;

import biz.impl.chenfeiwu.ZpglBiz;
/*
* 系统机构dwu
*/

/**
* 作者：何桂坤注释导入快捷键 Shift+alt+j
* 时间：2011-2-25
* 电子邮件：heguikun@foxmail.com
* QQ：307839227
* MSN：heguikun@msn.com
*/
public class XtszDwr    {
//把信息存到请求中
public String RequestPage(String page) throws Exception {
  WebContext ct=WebContextFactory.get();//Webcontext对象
   HttpServletRequest request=ct.getHttpServletRequest();//取得request
   request.setAttribute("requestPage", page);
  return page;

}
//添加
public boolean TextAdd(String clzString,String columnString,String jgJc) throws Exception {
  String sql="from "+clzString+" where "+columnString+"='"+jgJc+"'";//组织sql语句
   System.out.println("dwr中的sql语句："+sql);
  WebContext ct=WebContextFactory.get();//Webcontext对象
   HttpServletRequest request=ct.getHttpServletRequest();//取得request
     int size= CheckSize(request, sql);//调用如下方法
     if (size>0) {
     System.out.println("该名已经存在！");
    System.out.println("返回：true");
    return true;//存在
   }else {
    System.out.println("该名可用！");
    System.out.println("返回：false");
    return false;//不存在
   }

}
//2修改前检查
public boolean TextModify(String clzString,String columnString,String IDstring,String id,String

checkName) throws Exception {
    //1对象clz
  //2字段columnString
  //3该对象的id主键值IDstring
  //4排除的id
  //5检查的值checkName
  ///select * from dbo.JG where JG_JC='罗云篮霸' and JG_ID not in(1)

  String sql="from "+clzString
  +" where "
  +columnString+"='"+checkName
  +"'   and "+IDstring
  +" not in("+id+")";
  //组织sql语句
  System.out.println("dwr中的sql语句："+sql);

      WebContext ct=WebContextFactory.get();//Webcontext对象
   HttpServletRequest request=ct.getHttpServletRequest();//取得request
   int size= CheckSize(request, sql);//调用如下方法
      if (size>0) {
      System.out.println("该名已经存在！");
     System.out.println("返回：true");
     return true;//存在
    }else {
     System.out.println("该名可用！");
     System.out.println("返回：false");
     return false;//不存在
    }

}
///////////////////////////////公用方法///////////////////////////////
public static int CheckSize(HttpServletRequest request,String sql)throws Exception{
    ServletContext sc = request.getSession().getServletContext();
    ApplicationContext ac = WebApplicationContextUtils.getRequiredWebApplicationContext(sc);
    ZpglBiz biz = (ZpglBiz) ac.getBean("zpglBizImpl");//取得spring中的bean
  List list= biz.findQuery(sql);
     return list.size();
   }
}
///////////注意第一个RequestPage(String page)方法这里没有应用，相当于没有用