亚洲av乱码一区二区三区林ゆな_ 使用struts,ibaits和JSTL開(kāi)發(fā)簡(jiǎn)便通用的文件上傳系統

使用struts,ibaits和JSTL開(kāi)發(fā)簡(jiǎn)便通用的文件上傳系統

文件上傳也是一個(gè)老生常談的問(wèn)題了。struts提供了很方便的文件上傳組件，利用struts，很容易開(kāi)發(fā)文件上傳的系統。本文結合ibatis和JSTL開(kāi)發(fā)一個(gè)簡(jiǎn)便而通用的文件上傳系統。通過(guò)本文，你可以學(xué)到如何在struts里配置文件上傳功能、struts1.1的動(dòng)態(tài)form配置和使用、如果簡(jiǎn)單的使用ibatis，如果簡(jiǎn)單使用的JSTL。

首先我們要在struts-config里加上一句，來(lái)指定臨時(shí)目錄以及限制大小。

然后只要在form中加上enctype="multipart/form-data" 就可以實(shí)現struts的上傳了，十分簡(jiǎn)單吧？

下面我們在數據庫中建立一張表。

create sequence Attachment_seq;
      DROP TABLE ATTACHMENT;
      create table Attachment
      (
 AttachID                       INT                            not null, --自動(dòng)增長(cháng)號
   AttachFilename                 VARCHAR2(250)                  null,     --文件名
   AttachFileSize                 INT                            not null, --文件大小 
   AttachMimeType                 VARCHAR2(70)                   null,     --文件類(lèi)型 
   AttachDesc                     VARCHAR2(250)                  null,     --說(shuō)明
   AttachCreationIP               VARCHAR2(20)                   not null, --上傳的IP 
   AttachCreationDate             TIMESTAMP                      not null, --創(chuàng  )建時(shí)間
   AttachModifiedDate             TIMESTAMP                      not null,  --文件保存路徑
   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;

字段的內容都很簡(jiǎn)單。

下面建立ibatis的SQL map文件。建立標準的insert、update、delete和find的SQL。相信看過(guò)前面系列文章的朋友對此已經(jīng)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.ibatis.com/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>

下一小就是建立數據操作層的類(lèi)代碼

/*
 * 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數據庫操作對象   */

public class AttachDb {

 /**   * @param vo   * @throws DaoException   * 插入一條記錄   */   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   * 刪除一條記錄   */   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   * 修改一條記錄   */   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   * 查找一條記錄   */   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);   }   }

這一層的代碼也是多次見(jiàn)到的老朋友了。事實(shí)上對于大多數數據庫操作，我們都只需要上面這么一點(diǎn)代碼。然后我們建立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", "請選擇一個(gè)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", "數據庫操作錯誤!"));			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", "文件保存錯誤!"));			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", "文件操作錯誤!"));			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", "意外錯誤!"));			saveErrors(request, errors);			return mapping.findForward("false");		}			}

從上面可以看出，文件的保存工作很簡(jiǎn)單，只有三句

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

此處有一個(gè)DynaActionForm，通過(guò)DynaActionForm我們可以節省一個(gè)ActionForm的工作了。當然，這也多了一個(gè)配置工作。在struts-conifg.xml里加一個(gè)

<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>

這樣，struts在頁(yè)面提交以后會(huì )自動(dòng)去找upload、rul和 desc這三個(gè)輸入，并將它轉成相應的數據類(lèi)型。
所以我們很容易得到一個(gè)FormFile對象，而這個(gè)對象就包含了上傳文件的所有信息。因此，我們的數據表相應的信息也有了

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());

最后我們只要簡(jiǎn)單的調用函數插入數據庫

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

核心技術(shù)基本講解完畢。下面講一下實(shí)現的流程。大家可以先看一下demo。首先是一個(gè)index頁(yè)面，可以選擇一個(gè)上傳一個(gè)圖片文件直接顯示出來(lái)。也可以把內容顯示在input框中。

<form name="form1">
<img name="image1" src=""><input type="text" name="txt"></form><input type="button" value="檢測" onclick="alert(image1.src)"><input type="button" value="上傳文件" onclick="popUpWindow(‘<c:url value="/upload.do?m=list&url=document.image1.src"/>‘)"><input type="button" value="上傳文件(文件名到輸入框)" onclick="popUpWindow(‘<c:url value="/upload.do?m=list&url=document.form1.txt.value"/>‘)">

index.jsp的主要內容如上：主要特別的一點(diǎn)的地方就是<c:url>，是JSTL的url的tag,通過(guò)它可以得到相對路徑的URL。兩個(gè)按鈕的彈出框都是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這個(gè)對象中去。然后指到attachlist.jsp這個(gè)jsp文件去。作為view層，attachlist很簡(jiǎn)單的。

<a href="attach.jsp?url=<c:out value="${param[‘url‘]}"/>">添加文件</a>
<table width="100%" border="1">
<tr>
<td>名稱(chēng)</td>
<td>格式</td>
<td>文件</td>
<td>選擇</td>
</tr>
<c:forEach var="i" items="${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‘]}"/>‘);">選擇</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>">刪除</a></td>

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

首先我們可以看看怎么顯示表格 <c:forEach var="i" items="${fileslist}">通過(guò)forEach這個(gè)tag.得到fieslist里的對象。 <c:out value="${i[‘ATTACHDESC‘]}"/>，通過(guò)這一句也可以看到j(luò )stl顯示HashMap的數據是多么容易。下面就是參數化的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>">這里有兩個(gè)參數，一個(gè)是url，是從前面的param，也就是前一頁(yè)的參數取來(lái)的。另一個(gè)參數是從javaBean對象中取得。ATTACHID就是唯一鍵，刪除的時(shí)候就只要這一個(gè)參數就可以了。

刪除的代碼也簡(jiǎn)單，把ATTACHID放入hashMap,然后執行刪除(注，文件沒(méi)有實(shí)際刪除，不過(guò)要實(shí)現文件刪除的代碼也很簡(jiǎn)單。)。最后也是讀取所有的文件，再返回到本頁(yè)

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。這個(gè)文件是上傳的主要文件，實(shí)現一個(gè)實(shí)際的上傳界面。

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

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

提交以后執行前面所說(shuō)的add方面。然后轉到success.jsp。其內容就是把前面的fileName轉到index頁(yè)面，同時(shí)關(guān)閉自己。

window.close();

</script>

由此，我們完成了一個(gè)通用的文件上傳系統的粗的框架。

在線(xiàn)演示http://demo.ewuxi.com:8000/strutsupload/,源碼下載

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