java使用FileUpload实现有进度条的文件上传功能.docx

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AjaxServlet.java

packagecom.hongfei.servlet;

importjava.io.IOException;

importjava.io.PrintWriter;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importcom.hongfei.entity.Upload;

@SuppressWarnings（"serial"）

publicclassAjaxServletextendsHttpServlet{

/**

*Constructoroftheobject.

*/

publicAjaxServlet（）{

super（）;

}

/**

*Destructionoftheservlet.

*/

publicvoiddestroy（）{

super.destroy（）;//Justputs"destroy"stringinlog

//Putyourcodehere

}

/**

*ThedoGetmethodoftheservlet.

*

*Thismethodiscalledwhenaformhasitstagvaluemethodequalstoget.

*

*@paramrequesttherequestsendbytheclienttotheserver

*@paramresponsetheresponsesendbytheservertotheclient

*@throwsServletExceptionifanerroroccurred

*@throwsIOExceptionifanerroroccurred

*/

publicvoiddoGet（HttpServletRequestrequest,HttpServletResponseresponse）

throwsServletException,IOException{

response.setHeader（"Cache-Control","no-store"）;//禁止浏览器缓存

response.setHeader（"Pragrma","no-cache"）;//禁止浏览器缓存

response.setDateHeader（"Expires",0）;//禁止浏览器缓存

response.setContentType（"text/html"）;

PrintWriterout=response.getWriter（）;

Uploadupload=null;

upload=（Upload）request.getSession（）.getAttribute（"upload"）;

if（null==upload）

return;

longcurrentTime=System.currentTimeMillis（）;

//计算已用时，以S为单位

longtime=（currentTime-upload.getStartTime（））/1000+1;

//计算速度,以kb为单位

longspeed=（long）（double）upload.getUploadSize（）/1024/time;

//计算百分比

intpercent=（int）（（double）upload.getUploadSize（）/（double）upload.getTotalSize（）*100）;

//已经完成

intmb=（int）upload.getUploadSize（）/1024/1024;

//总共有多少

inttotalMb=（int）upload.getTotalSize（）/1024/1024;

//剩余时间

intshenYu=（int）（（upload.getTotalSize（）-upload.getUploadSize（））/1024/speed）;

Stringstr=time+"-"+speed+"-"+percent+"-"+mb+"-"+totalMb+"-"+shenYu;

out.print（str）;

out.flush（）;

out.close（）;

}

/**

*ThedoPostmethodoftheservlet.

*

*Thismethodiscalledwhenaformhasitstagvaluemethodequalstopost.

*

*@paramrequesttherequestsendbytheclienttotheserver

*@paramresponsetheresponsesendbytheservertotheclient

*@throwsServletExceptionifanerroroccurred

*@throwsIOExceptionifanerroroccurred

*/

publicvoiddoPost（HttpServletRequestrequest,HttpServletResponseresponse）

throwsServletException,IOException{

response.setContentType（"text/html"）;

PrintWriterout=response.getWriter（）;

out

.println（"

DOCTYPEHTMLPUBLIC\"-//W3C//DTDHTML4.01Transitional//EN\">"）;

out.println（""）;

out.println（""）;

out.println（""）;

out.print（"Thisis"）;

out.print（this.getClass（））;

out.println（",usingthePOSTmethod"）;

out.println（""）;

out.println（""）;

out.flush（）;

out.close（）;

}

/**

*Initializationoftheservlet.

*

*@throwsServletExceptionifanerroroccurs

*/

publicvoidinit（）throwsServletException{

//Putyourcodehere

}

}

Upload.java

packagecom.hongfei.servlet;

importjava.io.File;

importjava.io.FileOutputStream;

importjava.io.IOException;

importjava.io.InputStream;

importjava.io.PrintWriter;

importjava.util.Iterator;

importjava.util.List;

importjavax.servlet.ServletException;

importjavax.servlet.http.HttpServlet;

importjavax.servlet.http.HttpServletRequest;

importjavax.servlet.http.HttpServletResponse;

importmons.fileupload.FileItem;

importmons.fileupload.FileUploadException;

importmons.fileupload.disk.DiskFileItemFactory;

importmons.fileupload.servlet.ServletFileUpload;

importcom.hongfei.lister.UploadLister;

@SuppressWarnings（"serial"）

publicclassUploadextendsHttpServlet{

/**

*Constructoroftheobject.

*/

publicUpload（）{

super（）;

}

/**

*Destructionoftheservlet.

*/

publicvoiddestroy（）{

super.destroy（）;//Justputs"destroy"stringinlog

//Putyourcodehere

}

/**

*ThedoGetmethodoftheservlet.

*

*Thismethodiscalledwhenaformhasitstagvaluemethodequalstoget.

*

*@paramrequesttherequestsendbytheclienttotheserver

*@paramresponsetheresponsesendbytheservertotheclient

*@throwsServletExceptionifanerroroccurred

*@throwsIOExceptionifanerroroccurred

*/

publicvoiddoGet（HttpServletRequestrequest,HttpServletResponseresponse）

throwsServletException,IOException{

response.setContentType（"text/html"）;

PrintWriterout=response.getWriter（）;

out

.println（"

DOCTYPEHTMLPUBLIC\"-//W3C//DTDHTML4.01Transitional//EN\">"）;

out.println（""）;

out.println（""）;

out.println（""）;

out.print（"Thisis"）;

out.print（this.getClass（））;

out.println（",usingtheGETmethod"）;

out.println（""）;

out.println（""）;

out.flush（）;

out.close（）;

}

/**

*ThedoPostmethodoftheservlet.

*

*Thismethodiscalledwhenaformhasitstagvaluemethodequalstopost.

*

*@paramrequesttherequestsendbytheclienttotheserver

*@paramresponsetheresponsesendbytheservertotheclient

*@throwsServletExceptionifanerroroccurred

*@throwsIOExceptionifanerroroccurred

*/

@SuppressWarnings（{"deprecation","unchecked"}）

publicvoiddoPost（HttpServletRequestrequest,HttpServletResponseresponse）

throwsServletException,IOException{

response.setContentType（"text/html"）;

PrintWriterout=response.getWriter（）;

com.hongfei.entity.Uploadupload=newcom.hongfei.entity.Upload（）;

UploadListerlister=newUploadLister（upload）;

ServletFileUploadservletFileUpload=newServletFileUpload（newDiskFileItemFactory（））;

//只是上传监听器

servletFileUpload.setProgressListener（lister）;

request.getSession（）.setAttribute（"upload",upload）;

Listlist=null;

try{

list=servletFileUpload.parseRequest（request）;

}catch（FileUploadExceptione）{

e.printStackTrace（）;

}

for（Iteratoriter=list.iterator（）;iter.hasNext（）;）{

//得到文件对象

FileItemfileItem=（FileItem）iter.next（）;

//是表单才进行处理

if（fileItem.isFormField（））{

break;

}

//同意linux和windows的路径分隔符

Stringname=fileItem.getName（）.replaceAll（"/","\\"）;

//得到文件名

intindex=name.lastIndexOf（"\\"）;

StringfileFileName="";

if（index==-1）{

fileFileName=name;

}else{

fileFileName=name.substring（index+1）;

}

InputStreamfileInputStream=fileItem.getInputStream（）;

Stringpath=request.getRealPath（"/upload"）;

//也可不用自己写实现方法直接使用,fileItem.write（uploadFile）;

FileuploadFile=newFile（path,fileFileName）;

//首先要确认路径是否存在

uploadFile.getParentFile（）.mkdirs（）;

//检查文件是否已经存在

if（!

uploadFile.exists（））{

//建立文件

uploadFile.createNewFile（）;

}

FileOutputStreamout2=newFileOutputStream（uploadFile）;

//开始copy文件

@SuppressWarnings（"unused"）

intlen=0;//每次读取的字节数

byte[]bytes=newbyte[1024];

while（（len=fileInputStream.read（bytes,0,bytes.length））!

=-1）{

out2.write（bytes）;

}

out2.flush（）;

out2.close（）;

fileInputStream.close（）;

}

out.flush（）;

out.close（）;

}