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用JAVA实现ORACLE数据库的文件上传,下载


  文件上传使用:http://www.javazoom.net 的 UploadBean JAVA包,他的文件上传做的还不错,可进行目录或数据库的文件上传,默认使用的是O RACLE 的LONGRAW子段类型,可使用BLOB类型,但需要使用扩展JAVA包,LONGRAW子段最 大长度为2GB,并且一个表内只允许出现一个LONGRAW型子段,不过已经够我用了,而BL OB型子段最大为4GB,而且没有表中出现次数的限制。备注:想用他下载的组件Downloa d4J 1.0,我劝还是别做梦了,在功能上不太适合用在数据库下载。 文件下载使用的是:http://www.jspsmart.com的SmartUpload JAVA包,该包即可 以文件上传,也可以文件下在,而且使用也比较方便,不过我在这里只使用文件从数据 库下载功能,有兴趣的朋友可以试试。 下面我把使用这两个包的源CODE给大家说一下,以后大家碰道这些问题就不用象 我一样发愁了,哎!多伟大的人呀!大家给点掌声安慰我这个受伤的孤独男人吧! 
  
  文件上传:
  实际上这些JAVA包都有使用的例子,不过我还是要贴出来。  
  
  文件名:ChineseDatabaseUpload.jsp 
  
  文件内容: 
  <html> 
  <%@ page language="java" contentType="text/html; charset=gb2312" import="jav 
  azoom.upload.*,java.util.*" %> 
  <%@ page errorPage="ExceptionHandler.jsp" %> 
  <jsp:useBean id="upBean" scope="application" class="javazoom.upload.UploadBe 
  an" > 
  <% 
  Properties props = new Properties(); 
  props.put("user","cepic"); 
  props.put("password","lpsc"); 
  upBean.setDatabasestore("oracle.jdbc.driver.OracleDriver","jdbc:oracle:thin: 
  @10.231.234.252:1521:cepic",props); //数据库连接 
  %> 
  </jsp:useBean> 
  <head> 
  <title>中文上传</title> 
  <meta http-equiv="Content-Type" content="text/html; charset="gb2312"> 
  </head> 
  <body bgcolor="#FFFFFF" text="#000000"> 
  <ul><font size="-1" face="Verdana, Arial, Helvetica, sans-serif"> 
  <% 
  request.setCharacterEncoding("gb2312"); 
  if (MultipartFormDataRequest.isMultipartFormData(request)) 
  { 
  // Uses MultipartFormDataRequest to parse the HTTP request. 
  MultipartFormDataRequest mrequest = new MultipartFormDataRequest(request,nul 
  l,100*1024*1024,MultipartFormDataRequest.COSPARSER,"gb2312"); 
  String todo = mrequest.getParameter("todo"); 
  if ( (todo != null) && (todo.equalsIgnoreCase("upload")) ) 
  { 
  Hashtable files = mrequest.getFiles(); 
  if ( (files != null) || (!files.isEmpty()) ) 
  { 
  UploadFile file = (UploadFile) files.get("uploadfile"); 
  out.println("<li>Form field(表格栏): uploadfile"+"<BR> Uploaded file(已上传的 
  文件名称): "+file.getFileName()+" ("+file.getFileSize()+" bytes)"+"<BR> Cont 
  ent Type(文件类别)"+file.getContentType()); 
  //out.println("<li>Form field: uploadfile"+"<BR> Uploaded file: "+file.getFi 
  leName()+" ("+file.getFileSize()+" bytes)"+"<BR> Content Type"+file.getConte 
  ntType()); 
  // Uses the bean now to store specified by jsp:setProperty at the top. 
  upBean.store(mrequest, "uploadfile"); 
  } 
  else 
  { 
  out.println("<li>No uploaded files"); 
  } 
  out.println("<BR> gb2312 Text(简体) = "+mrequest.getParameter("gb2312txt")); 
   
  } 
  else out.println("<BR> todo="+todo); 
  } 
  %> 
  </font></ul> 
  <form method="post" action="ChineseDatabaseUpload.jsp" name="upform" enctype 
  ="multipart/form-data"> 
  <table width="60%" border="0" cellspacing="1" cellpadding="1" align="cente 
  r"> 
  <tr> 
  <td align="left"><font size="-1" face="Verdana, Arial, Helvetica, sans 
  -serif"><b>请选择上传文件:</b></font></td> 
  </tr> 
  <tr> 
  <td align="left"><font size="-1" face="Verdana, Arial, Helvetica, sans 
  -serif"> 
  <input type="file" name="uploadfile" size="50"> 
  </font></td> 
  </tr> 
  <tr> 
  <td align="left"><font size="-1" face="Verdana, Arial, Helvetica, sans 
  -serif"> 
  gb2312 text: 
  <input type="text" name="gb2312txt" size="20"> 
  </font></td> 
  </tr> 
  <tr> 
  <td align="left"><font size="-1" face="Verdana, Arial, Helvetica, sans 
  -serif"> 
  <input type="hidden" name="todo" value="upload"> 
  <input type="submit" name="Submit" value="上传"> 
  <input type="reset" name="Reset" value="取消"> 
  </font></td> 
  </tr> 
  </table> 
  <br> 
  <br> 
  <table width="90%" border="0" cellspacing="1" cellpadding="0" align="cente 
  r"> 
  <tr> 
  <td bgcolor="#666666"> 
  <table width="100%" border="0" cellspacing="1" cellpadding="0" align 
  ="center"> 
  <tr> 
  <td bgcolor="#FFFFFF"><font size="-1" face="Verdana, Arial, Helv 
  etica, sans-serif"><b><font color="#0000FF"> Needed 
  HTML tags :</font></b></font></td> 
  </tr> 
  <tr> 
  <td bgcolor="#FFFFFF"><font size="-1" face="Verdana, Arial, Helv 
  etica, sans-serif"> <<b>form</b> 
  <b>method</b>="<b><font color="#FF0000">post</font></b>" 
  <b>action</b>="<b><font color="#FF0000">ChineseUpload.jsp</fon 
  t></b>" 
  name="upload" <b>enctype</b>="<b><font color="#FF0000">multipa 
  rt/form-data</font></b>"></font></td> 
  </tr> 
  <tr> 
  <td bgcolor="#FFFFFF"><font size="-1" face="Verdana, Arial, Helv 
  etica, sans-serif"> <<b>input</b> 
  <b>type</b>="<b><font color="#FF0000">file</font></b>" 
  <b>name</b>="<font color="#FF0000"><b>uploadfile</b></font>" 
  size="50"></font></td> 
  </tr> 
  </table> 
  </td> 
  </tr> 
  </table> 
  <p> </p> 
  <p> </p> 
  <p align="center"> </p> 
  <p align="center"> </p> 
  <p align="center"> </p> 
  <p align="center"> </p> 
  </form> 
  </body> 
  </html> 
  该ORACLE的表结构,在该网站上找吧!很简单就三个子段而已。 
  
  文件下载: 
  文件名:jspsmartdownload.jsp 
  文件内容: 
  <meta http-equiv="Content-Type" content="application/msword; charset=gb2312" 
  > //注意这里,如果你没有设置成“GB2312”结果你会明白的。 
  <%@ page language="java" import="java.sql.*,com.jspsmart.upload.*"%> 
  <jsp:useBean id="mySmartUpload" scope="page" class="com.jspsmart.upload.Smar 
  tUpload" /> 
  <% 
  Class.forName("oracle.jdbc.driver.OracleDriver").newInstance(); 
  Connection con = DriverManager.getConnection("jdbc:oracle:thin10.231.234.2 
  52:1521:cepic", "cepic", "lpsc"); 
  Statement stmt = con.createStatement(); 
  ResultSet rs = stmt.executeQuery("SELECT * FROM UPLOADS"); 
  if (rs.next()){ 
  mySmartUpload.initialize(pageContext); 
  mySmartUpload.downloadField(rs,"BINARYFILE","application/msword",""); 
  //mySmartUpload.fieldToFile(rs,"BINARYFILE","c:/sample.DOC"); 
   
  } 
  rs.close(); 
  stmt.close(); 
  con.close(); 
  %>
  
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