在修改项目时,发现以前的jsp项目,附件上传用的是SmartUpload,系统中多处都用的是这这种方式上传,这种上传附件的机制大小只能传十兆左右,
而客户现在要求,至少50M,所以原有的SmartUpload不能满足需求,所以打算用Fileupload来实现附件上传功能。但如果换FileUpload,则系统代码改动量很大,大概有50于处地方都需要修改,遂放弃,直接修改代码的想法。
于是,看了一些代码后,自己写了一个从SmartUload到FileUpload转接的中间件程序,可实现不用修改原有SmartUpload上传的代码。
原上传的主要代码见下面:
SmartUpload objUpload = new SmartUpload(pageContext);
///主要代码
if(objUpload.getCount()>0)
{
for(int i=1;i<=objUpload.getCount();i++){
ps.setString(9,objUpload.getUgetContentType(i));
ps.setString(10,objUpload.getUFileName(i));
ps.setBinaryStream(11,objUpload.getUFileInputStream(i), objUpload.getFLength(i));//Content
}
}
我写的中间件类,类名也叫SmartUpload,但用的是Fileupload上传的机制:
package gui;
import java.io.*;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.*;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspWriter;
import javax.servlet.jsp.PageContext;
import org.apache.commons.fileupload.*;
import org.apache.commons.fileupload.servlet.*;
import org.apache.commons.fileupload.disk.*;
// Referenced classes of package gui:
// SmartFiles, SmartRequest, SmartUploadException, SmartFile
public class SmartUpload
{
protected Hashtable parameters;//保存普通form表单域
protected Hashtable files;//保存上传的文件
private int sizeThreshold = 4096;
public int maxflag=0;
private long filemaxsize=100*1024*1024; //默认100MB
protected HttpServletRequest m_request;
protected HttpServletResponse m_response;
protected ServletContext m_application;
private PageContext page;
private String pencoding;
public SmartUpload()
{
}
//构造方法 参数一 pagecontex 参数二 一般为GBK 参数三 上传的最大文件 单位MB
public SmartUpload(PageContext pagecontext,String encoding,long filesize)
throws ServletException, IOException,FileUploadException
{
page=null;
page=pagecontext;
m_request=(HttpServletRequest)page.getRequest();
m_response=(HttpServletResponse)page.getResponse();
if(encoding==null||"".equals(encoding)) encoding="GBK";
this.pencoding=encoding;
if(filesize<3) filesize=100;
System.out.println("fileupload版本号:sun2009101303. 最大上传:"+filesize+"Mb");
this.filemaxsize=filesize*1024*1024;
pageinit(m_request);
}
// 构造方法 参数一 pagecontex 参数二 上传的最大文件 单位MB
public SmartUpload(PageContext pagecontext,long filesize)
throws ServletException, IOException,FileUploadException
{
this(pagecontext,"GBK",filesize);
}
// 构造方法 参数一 pagecontex 参数二 编码格式
public SmartUpload(PageContext pagecontext,String encode)
throws ServletException, IOException,FileUploadException
{
this(pagecontext,encode,100);
}
// 构造方法 参数一 pagecontex 默认GBK 默认大小100MB
public SmartUpload(PageContext pagecontext)
throws ServletException, IOException,FileUploadException
{
this(pagecontext,"GBK",100);
}
public void pageinit(HttpServletRequest request) throws FileUploadException
{
int filecount=0; //附件个数
parameters = new Hashtable();
files = new Hashtable();
DiskFileItemFactory factory = new DiskFileItemFactory();
factory.setSizeThreshold(sizeThreshold);
ServletFileUpload upload = new ServletFileUpload(factory);
upload.setHeaderEncoding(this.pencoding);
upload.setFileSizeMax(filemaxsize);
try {
List items = upload.parseRequest(request);
Iterator iterator = items.iterator();
while(iterator.hasNext()){
FileItem item = (FileItem)iterator.next();
if(item.isFormField()){
String fieldName = item.getFieldName();
String value = item.getString();
//----------
if(parameters.containsKey(fieldName))
{
Hashtable hashtable = (Hashtable)parameters.get(fieldName);
hashtable.put(new Integer(hashtable.size()), value);
} else
{
Hashtable hashtable1 = new Hashtable();
hashtable1.put(new Integer(0), value);
parameters.put(fieldName, hashtable1);
}
//------------
}else{
//去除掉空的。没选择文件的file。
if(item.getSize()>filemaxsize)
{
maxflag=1;
System.out.println("文件过大="+item.getSize()+";最大值为="+filemaxsize/1024/1024+"MB");
}
if(item.getName()!=null&&!"".equals(item.getName()))
{
filecount=filecount+1;
files.put(filecount+"", item);
}
}
}
} catch (FileUploadException e) {
e.printStackTrace();
}
}
/**取得表单元素值。**/
public String getParameter(String s)
{
return this.getParameter(s,this.pencoding);
}
/**取得表单元素值。 可以选择编码方式,根据传递过来的来设定**/
public String getParameter(String s,String encode)
{
if(s == null)
throw new IllegalArgumentException("表单名字无效!!!");
Hashtable one = (Hashtable)parameters.get(s);
if(one==null)
return null;
String returnvalue=(String)one.get(new Integer(0));
if(returnvalue==null) returnvalue="";
try {
returnvalue=new String(returnvalue.getBytes("ISO-8859-1"),encode);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
return null;
}
if(returnvalue == null)
return null;
else
return returnvalue;
}
public String[] getParameterValues(String s)
{
if(s == null)
throw new IllegalArgumentException("Form's name is invalid or does not exist (1305).");
Hashtable hashtable = (Hashtable)this.parameters.get(s);
if(hashtable == null)
return null;
String as[] = new String[hashtable.size()];
for(int i = 0; i < hashtable.size(); i++)
as[i] = (String)hashtable.get(new Integer(i));
return as;
}
public SmartUpload getRequest()
{
return this;
}
public Enumeration getParameterNames()
{
return this.parameters.keys();
}
public SmartUpload getFiles()
{
return this;
}
public int getCount() //返回附件个数
{
return files.size();
}
public int getFCount() //返回附件个数
{
return getCount();
}
public String getUFileName(int aa)
{
//aa表示第几个附件,返回上传附件的名字
FileItem item=(FileItem)files.get(aa+"");
String fileName = item.getName();
fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
return fileName;
}
public String getFieldNames(int aa) //返回附件表单域的name
{
FileItem item=(FileItem)files.get(aa+"");
return item.getFieldName();
}
public String getUgetContentType(int aa)
{
// aa表示第几个附件,返回附件的格式,比如doc,xml,mp3
FileItem item=(FileItem)files.get(aa+"");
return item.getContentType();
}
public InputStream getUFileInputStream(int aa) throws IOException//返回输入流
{
FileItem item=(FileItem)files.get(aa+"");
return item.getInputStream();
}
public int getFLength(int aa) //返回附件大小
{
FileItem item=(FileItem)files.get(aa+"");
return (int)item.getSize();
}
public boolean isUfile(int aa) //判断该附件是否为空。
{
if(getUFileName(aa).equals(""))
return false;
else
return true;
}
public void clean()
{
//System.out.println("g关闭流文件");
//关闭流文件等资源性
}
}
这样,就可以实现从SmartUload到FileUpload的无缝转换了。原来项目的代码不用改动。自动转化成fileUPlaod上传机制。