Apache Commons fileUpload实现文件上传之一
废话不多说了，直奔主题了。
需要两个jar包：
commons-fileupload.jar
CommonsIO的jar包（本文使用commons-io-2.4.jar）
利用Servlet来实现文件上传。
packageweb.servlet;
importjava.io.IOException;
importjavax.servlet.ServletException;
importjavax.servlet.annotation.WebServlet;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importjava.io.File;
importjava.util.Iterator;
importjava.util.List;
importorg.apache.commons.fileupload.FileItem;
importorg.apache.commons.fileupload.disk.DiskFileItemFactory;
importorg.apache.commons.fileupload.servlet.ServletFileUpload;
/**
*ServletimplementationclassUploadServlet
*/
@WebServlet("/UploadServlet")
publicclassUploadServletextendsHttpServlet{
privatestaticfinallongserialVersionUID=1L;
privateStringuploadPath="D:\\temp";//上传文件的目录
privateStringtempPath="d:\\temp\\buffer\\";//临时文件目录
FiletempPathFile;
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsIOException,ServletException{
try{
//Createafactoryfordisk-basedfileitems
DiskFileItemFactoryfactory=newDiskFileItemFactory();
//Setfactoryconstraints
factory.setSizeThreshold(4096);//设置缓冲区大小，这里是4kb
factory.setRepository(tempPathFile);//设置缓冲区目录
//Createanewfileuploadhandler
ServletFileUploadupload=newServletFileUpload(factory);
//Setoverallrequestsizeconstraint
upload.setSizeMax(4194304);//设置最大文件尺寸，这里是4MB
List<FileItem>items=upload.parseRequest(request);//得到所有的文件
Iterator<FileItem>i=items.iterator();
while(i.hasNext()){
FileItemfi=(FileItem)i.next();
StringfileName=fi.getName();
if(fileName!=null){
FilefullFile=newFile(fi.getName());
FilesavedFile=newFile(uploadPath,fullFile.getName());
fi.write(savedFile);
}
}
System.out.print("uploadsucceed");
}catch(Exceptione){
//可以跳转出错页面
e.printStackTrace();
}
}
publicvoidinit()throwsServletException{
FileuploadFile=newFile(uploadPath);
if(!uploadFile.exists()){
uploadFile.mkdirs();
}
FiletempPathFile=newFile(tempPath);
if(!tempPathFile.exists()){
tempPathFile.mkdirs();
}
}
}
jsp
<%@pagelanguage="java"contentType="text/html;charset=ISO--" pageEncoding="utf-"%> <!DOCTYPEhtmlPUBLIC"-//WC//DTDHTML.Transitional//EN""http://www.w.org/TR/html/loose.dtd"> <html> <head> <metahttp-equiv="Content-Type"content="text/html;charset=GB"> <title>Fileupload</title> </head> <body> <!--//action="fileupload"对应web.xml中<servlet-mapping>中<url-pattern>的设置.--> <formname="myform"action="UploadServlet"method="post" enctype="multipart/form-data"> File:<br> <inputtype="file"name="myfile"><br> <br> <inputtype="submit"name="submit"value="Commit"> </form> </body> </html>
这样就能简单实现一个文件上传功能了，当然这是最最最基本的，继续研究中。