文件上傳也是一個老生常談的問題了。struts提供了很方便的文件上傳組件，利用struts，很容易開發文件上傳的系統。本文結合ibatis和JSTL開發一個簡便而通用的文件上傳系統。通過本文，你可以學到如何在struts里配置文件上傳功能、struts1.1的動態form配置和使用、如果簡單的使用ibatis，如果簡單使用的JSTL。
首先我們要在struts-config里加上一句，來指定臨時目錄以及限制大小。
<controller maxFileSize="2M" tempDir="d:/temp"/>
然后只要在form中加上enctype="multipart/form-data" 就可以實現struts的上傳了，十分簡單吧？
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, --自動增長號 AttachFilename VARCHAR2(250) null, --文件名 AttachFileSize INT not null, --文件大小 AttachMimeType VARCHAR2(70) null, --文件類型 AttachDesc VARCHAR2(250) null, --說明 AttachCreationIP VARCHAR2(20) not null, --上傳的IP AttachCreationDate TIMESTAMP not null, --創建時間 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。相信看過前面系列文章的朋友對此已經很熟悉了。
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE sql-mapPUBLIC "-//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到的老朋友了。事實上對于大多數數據庫操作，我們都只需要上面這么一點代碼。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單，只有三句
DynaActionForm fm = (DynaActionForm) form;
FormFile ff = (FormFile) fm.get("upload");
FileManager.saveFile(fileName, ff);
此處有一個DynaActionForm，通過DynaActionForm我們可以節省一個ActionForm的工作了。當然，這也多了一個配置工作。在struts-conifg.xml里加一個
<!-- 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>
這樣，struts在頁面提交以后會自動去找upload、rul和 desc這三個輸入 ，并將它轉成相應的數據類型。
所以我們很容易得到一個FormFile對象，而這個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());
最后我們只要簡單的調用函數插入數據庫
DaoCommon.startTransaction();
attachDb.insert(map);
DaoCommon.commit();
核心技術基本講解完畢。下面講一下實現的流程。大家可以先看一下demo。首先是一個index頁面，可以選擇一個上傳一個圖片文件直接顯示出來。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：主要特別的一點的地方就是<c:url>，是JSTL的url的tag,通過它可以得到相對路徑的URL。兩個按鈕的彈出框都是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這個對象中去。然后指到attachlist.jsp這個jsp文件去。作為view層，attachlist很簡單的。
<a href="attach.jsp?url=<c:out value="${param[′url′]}"/>">添加文件</a>
<table width="100%" border="1">
<tr>
<td>名稱</td>
<td>格式</td>
<td>文件</td>
<td>選擇</td>
</tr>
<c:forEach var="i" items="${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forEach這個tag.得到fieslist里的對象。 <c:out value="${i[′ATTACHDESC′]}"/>，通過這一句也可以看到jstl顯示HashMap的數據是多么容易。 下面就是參數化的URL,看下面的URL。
<a href="<c:url value="upload.do?m=del"><c:param name="url" value="${param[′url′]}"/><c:param name="ATTACHID" value="${i[′ATTACHID′]}"/></c:url>">這里有兩個參數，一個是url，是從前面的param，也就是前一頁的參數取來的。另一個參數是從javaBean對象中取得。ATTACHID就是唯一鍵，刪除的時候就只要這一個參數就可以了。
刪除的代碼也簡單，把ATTACHID放入hashMap,然后執行刪除(注，文件沒有實際刪除，不過要實現文件刪除的代碼也很簡單。)。最后也是讀取所有的文件，再返回到本頁
AttachDb attachDb = new AttachDb();
DaoCommon.startTransaction();
HashMap delMap = new HashMap();
delMap.put(
Constattachment.ATTACHID,
request.getParameter("ATTACHID"));
attachDb.delete(delMap);
request.setAttribute("fileslist", attachDb.find(new HashMap()));
DaoCommon.commit();
添加文件指向attach.jsp。這個文件是上傳的主要文件，實現一個實際的上傳界面。
<a href="<c:url value="/upload.do?m=list"><c:param name="url" value="${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="${param[′url′]}"/>">
<input name="m" type="hidden" value="add">
<input type="submit" name="Submit" value="上傳">
</html:form >
</p>
</body>
提交以后執行前面所說的add方面。然后轉到success.jsp。其內容就是把前面的fileName轉到index頁面，同時關閉自己。
<script>
opener.<c:out value="${url}"/>="<c:url value="/${fileName}"/>";
window.close();
</script>
posted on 2005-09-25 00:20
R.Zeus 閱讀(411)
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