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使用struts,ibaits和JSTL开发简便通用的文件上传系统

 smoking_boy 2005-08-08
使用struts,ibaits和JSTL开发简便通用的文件上传系统

    文件上传也是一个老生常谈的问题了。struts提供了很方便的文件上传组件，利用struts，很容易开发文件上传的系统。本文结合ibatis和JSTL开发一个简便而通用的文件上传系统。通过本文，你可以学到如何在struts里配置文件上传功能、struts1.1的动态form配置和使用、如果简单的使用ibatis，如果简单使用的JSTL。

    首先我们要在struts-config里加上一句，来指定临时目录以及限制大小。

<controller maxFileSize="2M" tempDir="d:/temp"/>

然后只要在form中加上enctype="multipart/form-data" 就可以实现struts的上传了，十分简单吧？

下面我们在数据库中建立一张表。

create sequence Attachment_seq;

      DROP TABLE ATTACHMENT;

      create table Attachment

      (

 AttachID                       INT                            not null, --自动增长号
   AttachFilename                 VARCHAR2(250)                  null,     --文件名
   AttachFileSize                 INT                            not null, --文件大小 
   AttachMimeType                 VARCHAR2(70)                   null,     --文件类型 
   AttachDesc                     VARCHAR2(250)                  null,     --说明
   AttachCreationIP               VARCHAR2(20)                   not null, --上传的IP 
   AttachCreationDate             TIMESTAMP                      not null, --创建时间
   AttachModifiedDate             TIMESTAMP                      not null,  --文件保存路径
   ATTACHFILEPATH      VARCHAR2 (250)  NOT NULL,

primary key (AttachID)

);

create or replace trigger Attach_trig_autoinc

before insert on Attachment

for each row

begin

if (:new.AttachID is null) then 

select Attachment_seq.nextval into :new.AttachID from dual;

end if;

end;

字段的内容都很简单。

下面建立ibatis的SQL map文件。建立标准的insert、update、delete和find的SQL。相信看过前面系列文章的朋友对此已经很熟悉了。

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE sql-map
PUBLIC "-//iBATIS.com//DTD SQL Map 1.0//EN"
"http://www./dtd/sql-map.dtd">
<sql-map name="attachment">
<!-- =============================================
    mapped-statement insert 
============================================= -->
<dynamic-mapped-statement name="insertattachmentDao"  >
   insert into ATTACHMENT
    (   <dynamic prepend="">
      <isPropertyAvailable prepend="," property="ATTACHID" >
         <isNotNull prepend="" property="ATTACHID" >
             ATTACHID
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHFILENAME" >
         <isNotNull prepend="" property="ATTACHFILENAME" >
             ATTACHFILENAME
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHFILEPATH" >
         <isNotNull prepend="" property="ATTACHFILEPATH" >
             ATTACHFILEPATH
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHFILESIZE" >
         <isNotNull prepend="" property="ATTACHFILESIZE" >
             ATTACHFILESIZE
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHMIMETYPE" >
         <isNotNull prepend="" property="ATTACHMIMETYPE" >
             ATTACHMIMETYPE
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHDESC" >
         <isNotNull prepend="" property="ATTACHDESC" >
             ATTACHDESC
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHCREATIONIP" >
         <isNotNull prepend="" property="ATTACHCREATIONIP" >
             ATTACHCREATIONIP
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHCREATIONDATE" >
         <isNotNull prepend="" property="ATTACHCREATIONDATE" >
             ATTACHCREATIONDATE
         </isNotNull>
      </isPropertyAvailable>
      <isPropertyAvailable prepend="," property="ATTACHMODIFIEDDATE" >
         <isNotNull prepend="" property="ATTACHMODIFIEDDATE" >
             ATTACHMODIFIEDDATE
         </isNotNull>
      </isPropertyAvailable>
  </dynamic>		)
	 VALUES (
 <dynamic prepend="">
 <isPropertyAvailable prepend="," property="ATTACHID" >
 <isNotNull prepend="" property="ATTACHID" >
   #ATTACHID#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILENAME" >
 <isNotNull prepend="" property="ATTACHFILENAME" >
   #ATTACHFILENAME#
 </isNotNull> 
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILEPATH" >
 <isNotNull prepend="" property="ATTACHFILEPATH" >
   #ATTACHFILEPATH#
 </isNotNull> 
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILESIZE" >
 <isNotNull prepend="" property="ATTACHFILESIZE" >
   #ATTACHFILESIZE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHMIMETYPE" >
 <isNotNull prepend="" property="ATTACHMIMETYPE" >
   #ATTACHMIMETYPE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHDESC" >
 <isNotNull prepend="" property="ATTACHDESC" >
   #ATTACHDESC#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHCREATIONIP" >
 <isNotNull prepend="" property="ATTACHCREATIONIP" >
   #ATTACHCREATIONIP#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHCREATIONDATE" >
 <isNotNull prepend="" property="ATTACHCREATIONDATE" >
   #ATTACHCREATIONDATE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHMODIFIEDDATE" >
 <isNotNull prepend="" property="ATTACHMODIFIEDDATE" >
   #ATTACHMODIFIEDDATE#
 </isNotNull>
 </isPropertyAvailable>
 </dynamic>)
 </dynamic-mapped-statement>
       
<!-- =============================================
   mapped-statement update 
   ============================================= -->
 <dynamic-mapped-statement name="updateattachmentDao" >
   update ATTACHMENT
 <dynamic prepend="set">
 <isPropertyAvailable prepend="," property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILENAME" >
   ATTACHFILENAME=#ATTACHFILENAME:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILEPATH" >
   ATTACHFILEPATH=#ATTACHFILEPATH:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILESIZE" >
   ATTACHFILESIZE=#ATTACHFILESIZE#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHMIMETYPE" >
   ATTACHMIMETYPE=#ATTACHMIMETYPE:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHDESC" >
   ATTACHDESC=#ATTACHDESC:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHCREATIONIP" >
   ATTACHCREATIONIP=#ATTACHCREATIONIP:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHCREATIONDATE" >
   ATTACHCREATIONDATE=#ATTACHCREATIONDATE#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHMODIFIEDDATE" >
   ATTACHMODIFIEDDATE=#ATTACHMODIFIEDDATE#
 </isPropertyAvailable>
 </dynamic>
 <dynamic prepend="where"> 
 <isPropertyAvailable prepend="and" property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILENAME" >
   ATTACHFILENAME=#ATTACHFILENAME:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILEPATH" >
   ATTACHFILEPATH=#ATTACHFILEPATH:VARCHAR#
 </isPropertyAvailable> 
 <isPropertyAvailable prepend="and" property="ATTACHFILESIZE" >
   ATTACHFILESIZE=#ATTACHFILESIZE#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMIMETYPE" >
   ATTACHMIMETYPE=#ATTACHMIMETYPE:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHDESC" >
   ATTACHDESC=#ATTACHDESC:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONIP" >
   ATTACHCREATIONIP=#ATTACHCREATIONIP:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONDATE" >
   ATTACHCREATIONDATE=#ATTACHCREATIONDATE#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMODIFIEDDATE" >
   ATTACHMODIFIEDDATE=#ATTACHMODIFIEDDATE#
 </isPropertyAvailable>
 </dynamic>
 </dynamic-mapped-statement>
       
<!-- =============================================
   mapped-statement updateByPrimaryKey 
   ============================================= -->
 <dynamic-mapped-statement name="updateByPrimaryKeyattachmentDao" >
   update ATTACHMENT
 <dynamic prepend="set">
 <isPropertyAvailable prepend="," property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILENAME" >
   ATTACHFILENAME=#ATTACHFILENAME:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHFILEPATH" >
   ATTACHFILEPATH=#ATTACHFILEPATH:VARCHAR#
 </isPropertyAvailable> 
 <isPropertyAvailable prepend="," property="ATTACHFILESIZE" >
   ATTACHFILESIZE=#ATTACHFILESIZE#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHMIMETYPE" >
   ATTACHMIMETYPE=#ATTACHMIMETYPE:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHDESC" >
   ATTACHDESC=#ATTACHDESC:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHCREATIONIP" >
   ATTACHCREATIONIP=#ATTACHCREATIONIP:VARCHAR#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHCREATIONDATE" >
   ATTACHCREATIONDATE=#ATTACHCREATIONDATE#
 </isPropertyAvailable>
 <isPropertyAvailable prepend="," property="ATTACHMODIFIEDDATE" >
   ATTACHMODIFIEDDATE=#ATTACHMODIFIEDDATE#
 </isPropertyAvailable>
 </dynamic>
   
 <dynamic prepend="where">
 <isPropertyAvailable prepend="and" property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isPropertyAvailable>
 </dynamic>
 </dynamic-mapped-statement>
       
<!-- =============================================
   mapped-statement delete 
   ============================================= -->
 <dynamic-mapped-statement name="deleteattachmentDao" result-class="java.util.HashMap">
   delete from ATTACHMENT
 <dynamic prepend="where">
 <isPropertyAvailable prepend="and" property="ATTACHID" >
 <isNotNull prepend="" property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILENAME" >
 <isNotNull prepend="" property="ATTACHFILENAME" >
   ATTACHFILENAME=#ATTACHFILENAME#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property=" ATTACHFILEPATH" >
 <isNotNull prepend="" property=" ATTACHFILEPATH" >
   ATTACHFILEPATH=# ATTACHFILEPATH#
 </isNotNull>
 </isPropertyAvailable> 
 <isPropertyAvailable prepend="and" property="ATTACHFILESIZE" >
 <isNotNull prepend="" property="ATTACHFILESIZE" >
   ATTACHFILESIZE=#ATTACHFILESIZE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMIMETYPE" >
 <isNotNull prepend="" property="ATTACHMIMETYPE" >
   ATTACHMIMETYPE=#ATTACHMIMETYPE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHDESC" >
 <isNotNull prepend="" property="ATTACHDESC" >
   ATTACHDESC=#ATTACHDESC#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONIP" >
 <isNotNull prepend="" property="ATTACHCREATIONIP" >
   ATTACHCREATIONIP=#ATTACHCREATIONIP#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONDATE" >
 <isNotNull prepend="" property="ATTACHCREATIONDATE" >
   ATTACHCREATIONDATE=#ATTACHCREATIONDATE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMODIFIEDDATE" >
 <isNotNull prepend="" property="ATTACHMODIFIEDDATE" >
   ATTACHMODIFIEDDATE=#ATTACHMODIFIEDDATE#
 </isNotNull>
 </isPropertyAvailable>
 </dynamic>
 </dynamic-mapped-statement>
       
<!-- =============================================
   mapped-statement deleteByPrimaryKey 
   ============================================= -->
 <mapped-statement name="deleteByPrimaryKeyattachmentDao" >
   delete from ATTACHMENT
   where
   ATTACHID=#ATTACHID#
   
 </mapped-statement>
       
<!-- =============================================
   mapped-statement find 
   ============================================= -->
 <dynamic-mapped-statement name="findattachmentDao" result-class="java.util.HashMap">
   select * from ATTACHMENT
 <dynamic prepend="where">
 <isPropertyAvailable prepend="and" property="ATTACHID" >
 <isNotNull prepend="" property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILENAME" >
 <isNotNull prepend="" property="ATTACHFILENAME" >
   ATTACHFILENAME=#ATTACHFILENAME#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILEPATH" >
 <isNotNull prepend="" property="ATTACHFILEPATH" >
   ATTACHFILEPATH=#ATTACHFILEPATH#
 </isNotNull>
 </isPropertyAvailable> 
 <isPropertyAvailable prepend="and" property="ATTACHFILESIZE" >
 <isNotNull prepend="" property="ATTACHFILESIZE" >
   ATTACHFILESIZE=#ATTACHFILESIZE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMIMETYPE" >
 <isNotNull prepend="" property="ATTACHMIMETYPE" >
   ATTACHMIMETYPE=#ATTACHMIMETYPE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHDESC" >
 <isNotNull prepend="" property="ATTACHDESC" >
   ATTACHDESC=#ATTACHDESC#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONIP" >
 <isNotNull prepend="" property="ATTACHCREATIONIP" >
   ATTACHCREATIONIP=#ATTACHCREATIONIP#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONDATE" >
 <isNotNull prepend="" property="ATTACHCREATIONDATE" >
   ATTACHCREATIONDATE=#ATTACHCREATIONDATE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMODIFIEDDATE" >
 <isNotNull prepend="" property="ATTACHMODIFIEDDATE" >
   ATTACHMODIFIEDDATE=#ATTACHMODIFIEDDATE#
 </isNotNull>
 </isPropertyAvailable>
 </dynamic>
 <dynamic prepend="order by ">
 <isNotNull prepend="" property="sortOrder" >
   $sortOrder$
 </isNotNull>
 <isNull prepend="" property="sortOrder" >
 </isNull>
 </dynamic>
 </dynamic-mapped-statement>
       
<!-- =============================================
   mapped-statement findByPrimaryKey 
   ============================================= -->
 <mapped-statement name="findByPrimaryKeyattachmentDao" result-class="java.util.HashMap">
   select * from ATTACHMENT
   where
   ATTACHID=#ATTACHID#
 </mapped-statement>
       
<!-- =============================================
   mapped-statement findcount 
   ============================================= -->
 <dynamic-mapped-statement name="findattachmentDaoCount" result-class="java.lang.Integer">
   select count(1) from ATTACHMENT
 <dynamic prepend="where">
 <isPropertyAvailable prepend="and" property="ATTACHID" >
 <isNotNull prepend="" property="ATTACHID" >
   ATTACHID=#ATTACHID#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILENAME" >
 <isNotNull prepend="" property="ATTACHFILENAME" >
   ATTACHFILENAME=#ATTACHFILENAME#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHFILEPATH" >
 <isNotNull prepend="" property="ATTACHFILEPATH" >
   ATTACHFILEPATH=#ATTACHFILENAME#
 </isNotNull>
 </isPropertyAvailable> 
 <isPropertyAvailable prepend="and" property="ATTACHFILESIZE" >
 <isNotNull prepend="" property="ATTACHFILESIZE" >
   ATTACHFILESIZE=#ATTACHFILESIZE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMIMETYPE" >
 <isNotNull prepend="" property="ATTACHMIMETYPE" >
   ATTACHMIMETYPE=#ATTACHMIMETYPE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHDESC" >
 <isNotNull prepend="" property="ATTACHDESC" >
   ATTACHDESC=#ATTACHDESC#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONIP" >
 <isNotNull prepend="" property="ATTACHCREATIONIP" >
   ATTACHCREATIONIP=#ATTACHCREATIONIP#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHCREATIONDATE" >
 <isNotNull prepend="" property="ATTACHCREATIONDATE" >
   ATTACHCREATIONDATE=#ATTACHCREATIONDATE#
 </isNotNull>
 </isPropertyAvailable>
 <isPropertyAvailable prepend="and" property="ATTACHMODIFIEDDATE" >
 <isNotNull prepend="" property="ATTACHMODIFIEDDATE" >
   ATTACHMODIFIEDDATE=#ATTACHMODIFIEDDATE#
 </isNotNull>
 </isPropertyAvailable>
 </dynamic>
 </dynamic-mapped-statement>
 
</sql-map>

下一小就是建立数据操作层的类代码

/*
 * Created on 2003-10-11
 *
 * To change the template for this generated file go to
 * Window - Preferences - Java - Code Generation - Code and Comments
 */
package com.ewuxi.champion.persistence.dao;
import java.util.HashMap;
         import java.util.List;
import com.ewuxi.champion.exception.DaoException;
         import com.ibatis.db.sqlmap.SqlMap;
/**
   * @author champion
   *
   *attachment数据库操作对象
   */
public class AttachDb {
 /**
   * @param vo
   * @throws DaoException
   * 插入一条记录
   */
   public void insert(HashMap vo) throws DaoException {
   try {
   SqlMap sqlMap = DaoCommon.getSqlMap(DaoCommon.getDefautDao());
   sqlMap.executeUpdate("insertattachmentDao", vo);
   } catch (Exception e) {
   throw new DaoException(e);
   }
   }
   /**
   * @param vo
   * @throws DaoException
   * 删除一条记录
   */
   public void delete(HashMap vo) throws DaoException {
   try {
   SqlMap sqlMap = DaoCommon.getSqlMap(DaoCommon.getDefautDao());
   sqlMap.executeUpdate("deleteByPrimaryKeyattachmentDao", vo);
   } catch (Exception e) {
   throw new DaoException(e);
   }
   }
   /**
   * @param vo
   * @throws DaoException
   * 修改一条记录
   */
   public void update(HashMap vo) throws DaoException {
   try {
   SqlMap sqlMap = DaoCommon.getSqlMap(DaoCommon.getDefautDao());
   sqlMap.executeUpdate("updateByPrimaryKeyattachmentDao", vo);
   } catch (Exception e) {
   throw new DaoException(e);
   }
   }
   /**
   * @param vo
   * @return
   * @throws DaoException
   * 查找一条记录
   */
   public HashMap findByPk(HashMap vo) throws DaoException {
   try {
   SqlMap sqlMap = DaoCommon.getSqlMap(DaoCommon.getDefautDao());
   return (HashMap) sqlMap.executeQueryForObject(
 "findByPrimaryKeyattachmentDao",
   vo);
   } catch (Exception e) {
   throw new DaoException(e);
   }
   }
   public List find(Object vo) throws DaoException {
   try {
   SqlMap sqlMap = DaoCommon.getSqlMap(DaoCommon.getDefautDao());
   return (List) sqlMap.executeQueryForList("findattachmentDao", vo);
   } catch (Exception e) {
   throw new DaoException(e);
   }
   }
}

这一层的代码也是多次见到的老朋友了。事实上对于大多数数据库操作，我们都只需要上面这么一点代码。然后我们建立add的action方法

	public ActionForward add(
		ActionMapping mapping,
		ActionForm form,
		HttpServletRequest request,
		HttpServletResponse response)
		throws Exception {
		try {

			Service.initSet();
			if (form instanceof DynaActionForm) {

				DynaActionForm fm = (DynaActionForm) form;
				FormFile ff = (FormFile) fm.get("upload");
				if (ff != null && ff.getFileSize()>0) {
					String fileName =
						Service.getPath().substring(
							0,
							Service.getPath().length()
								- "/WEB-INF/classes".length())
							+ "file/"
							+ ff.getFileName();
					HashMap map = new HashMap();
					map.put(Constattachment.ATTACHDESC, fm.get("desc"));
					map.put(Constattachment.ATTACHFILENAME, ff.getFileName());
					map.put(
						Constattachment.ATTACHMIMETYPE,
						ff.getContentType());
					map.put(Constattachment.ATTACHCREATIONDATE, new Date());
					map.put(Constattachment.ATTACHMODIFIEDDATE, new Date());
					map.put(
						Constattachment.ATTACHFILESIZE,
						String.valueOf(ff.getFileSize()));
					map.put(
						Constattachment.ATTACHFILEPATH,
						"/file/" + ff.getFileName());
					map.put(
						Constattachment.ATTACHCREATIONIP,
						request.getRemoteAddr());
					FileManager.saveFile(fileName, ff);
					AttachDb attachDb = new AttachDb();

					DaoCommon.startTransaction();
					attachDb.insert(map);
					DaoCommon.commit();
					request.setAttribute("url", fm.get("url"));
					request.setAttribute(
						"fileName",
						"/file/" + ff.getFileName());
					log.info(ff.getFileName());
					return mapping.findForward("success");
				}
			}
			ActionErrors errors = new ActionErrors();
			errors.add(
				ActionErrors.GLOBAL_ERROR,
				new ActionError("errors.general", "请选择一个文件!"));
			saveErrors(request, errors);
			return mapping.findForward("false");
		} catch (DaoException e) {
			log.error(e, e);
			DaoCommon.rollBack();
			ActionErrors errors = new ActionErrors();
			errors.add(
				ActionErrors.GLOBAL_ERROR,
				new ActionError("errors.general", "数据库操作错误!"));
			saveErrors(request, errors);
			return mapping.findForward("false");
		} catch (FileNotFoundException e) {
			log.error(e, e);
			ActionErrors errors = new ActionErrors();
			errors.add(
				ActionErrors.GLOBAL_ERROR,
				new ActionError("errors.general", "文件保存错误!"));
			saveErrors(request, errors);
			return mapping.findForward("false");
		} catch (IOException e) {
			log.error(e, e);
			ActionErrors errors = new ActionErrors();
			errors.add(
				ActionErrors.GLOBAL_ERROR,
				new ActionError("errors.general", "文件操作错误!"));
			saveErrors(request, errors);
			return mapping.findForward("false");
		} catch (Exception e) {
			log.error(e, e);
			ActionErrors errors = new ActionErrors();
			errors.add(
				ActionErrors.GLOBAL_ERROR,
				new ActionError("errors.general", "意外错误!"));
			saveErrors(request, errors);
			return mapping.findForward("false");
		}
		
	}
 

从上面可以看出，文件的保存工作很简单，只有三句

DynaActionForm fm = (DynaActionForm) form;
FormFile ff = (FormFile) fm.get("upload");
FileManager.saveFile(fileName, ff);

此处有一个DynaActionForm，通过DynaActionForm我们可以节省一个ActionForm的工作了。当然，这也多了一个配置工作。在struts-conifg.xml里加一个


<!-- upload form bean -->
<form-bean name="uploadForm"
type="org.apache.struts.action.DynaActionForm">
<form-property name="upload" type="org.apache.struts.upload.FormFile"/>
<form-property name="url" type="java.lang.String"/>
<form-property name="desc" type="java.lang.String"/>
</form-bean>

这样，struts在页面提交以后会自动去找upload、rul和 desc这三个输入 ，并将它转成相应的数据类型。
所以我们很容易得到一个FormFile对象，而这个对象就包含了上传文件的所有信息。因此，我们的数据表相应的信息也有了

map.put(Constattachment.ATTACHFILENAME, ff.getFileName());
map.put( Constattachment.ATTACHMIMETYPE, ff.getContentType());
map.put( Constattachment.ATTACHFILESIZE, String.valueOf(ff.getFileSize()));
map.put( Constattachment.ATTACHFILEPATH, "/file/" + ff.getFileName());

最后我们只要简单的调用函数插入数据库

DaoCommon.startTransaction();
attachDb.insert(map);
DaoCommon.commit();

核心技术基本讲解完毕。下面讲一下实现的流程。大家可以先看一下demo。首先是一个index页面，可以选择一个上传一个图片文件直接显示出来。也可以把内容显示在input框中。

<form name="form1">
<img name="image1" src="">
<input type="text" name="txt">
</form>
<input type="button" value="检测" onclick="alert(image1.src)">
<input type="button" value="上传文件" onclick="popUpWindow(‘<c:url value="/upload.do?m=list&url=document.image1.src"/>‘)">
<input type="button" value="上传文件(文件名到输入框)" onclick="popUpWindow(‘<c:url value="/upload.do?m=list&url=document.form1.txt.value"/>‘)">

index.jsp的主要内容如上：主要特别的一点的地方就是<c:url>，是JSTL的url的tag,通过它可以得到相对路径的URL。两个按钮的弹出框都是upload.do，方法是list.list的方法很少

AttachDb attachDb = new AttachDb();

DaoCommon.startTransaction();

request.setAttribute("fileslist", attachDb.find(new HashMap()));

DaoCommon.rollBack();

主要就是列出表中所有文件。放到fileslist这个对象中去。然后指到attachlist.jsp这个jsp文件去。作为view层，attachlist很简单的。

<a href="attach.jsp?url=<c:out value="${param[‘url‘]}"/>">添加文件</a>
<table width="100%" border="1">
<tr>
<td>名称</td>
<td>格式</td>
<td>文件</td>
<td>选择</td>
</tr>
<c:forEach var="i" items="${fileslist}">
<tr>
<td><c:out value="${i[‘ATTACHDESC‘]}"/></td>
<td><c:out value="${i[‘ATTACHMIMETYPE‘]}"/></td>
<td><c:out value="${i[‘ATTACHFILEPATH‘]}"/></td>
<td><a href="#" onclick="selectone(‘<c:url value="/${i[‘ATTACHFILEPATH‘]}"/>‘);">选择</a> <a href="<c:url value="upload.do?m=del"><c:param name="url" value="${param[‘url‘]}"/><c:param name="ATTACHID" value="${i[‘ATTACHID‘]}"/></c:url>">删除</a></td>

</tr>
</c:forEach>
</table>
</body>
</html>
<script>
function selectone(value){
opener.<c:out value="${param[‘url‘]}"/>=value ;
window.close();
}
</script>


首先我们可以看看怎么显示表格 <c:forEach var="i" items="${fileslist}">通过forEach这个tag.得到fieslist里的对象。 <c:out value="${i[‘ATTACHDESC‘]}"/>，通过这一句也可以看到jstl显示HashMap的数据是多么容易。 下面就是参数化的URL,看下面的URL。

<a href="<c:url value="upload.do?m=del"><c:param name="url" value="${param[‘url‘]}"/><c:param name="ATTACHID" value="${i[‘ATTACHID‘]}"/></c:url>">这里有两个参数，一个是url，是从前面的param，也就是前一页的参数取来的。另一个参数是从javaBean对象中取得。ATTACHID就是唯一键，删除的时候就只要这一个参数就可以了。

删除的代码也简单，把ATTACHID放入hashMap,然后执行删除(注，文件没有实际删除，不过要实现文件删除的代码也很简单。)。最后也是读取所有的文件，再返回到本页


AttachDb attachDb = new AttachDb();

DaoCommon.startTransaction();
HashMap delMap = new HashMap();
delMap.put(
Constattachment.ATTACHID,
request.getParameter("ATTACHID"));
attachDb.delete(delMap);

request.setAttribute("fileslist", attachDb.find(new HashMap()));

DaoCommon.commit();

添加文件指向attach.jsp。这个文件是上传的主要文件，实现一个实际的上传界面。

<a href="<c:url value="/upload.do?m=list"><c:param name="url" value="${param[‘url‘]}"/></c:url>">文件管理器</a>
<p>
<html:form action="/upload" enctype="multipart/form-data" onsubmit="return validate(this);">
说明： <input name="desc" type="input" size="30"> <br>
文件：<input name="upload" type="file" id="upload" size="50"><br>
<input name="url" type="hidden" value="<c:out value="${param[‘url‘]}"/>">
<input name="m" type="hidden" value="add">
<input type="submit" name="Submit" value="上传">

</html:form >
</p>
</body>

提交以后执行前面所说的add方面。然后转到success.jsp。其内容就是把前面的fileName转到index页面，同时关闭自己。

<script>
opener.<c:out value="${url}"/>="<c:url value="/${fileName}"/>";

window.close();

</script>

由此，我们完成了一个通用的文件上传系统的粗的框架。

在线演示http://demo.:8000/strutsupload/,源码下载

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