jsp+servlet实现文件上传与下载功能
本文实例为大家分享了jspservlet实现文件上传与下载的具体代码，供大家参考，具体内容如下
上传：
需要导入两个包：commons-fileupload-1.2.1.jar,commons-io-1.4.jar
importjava.io.File;
importjava.io.IOException;
importjava.util.List;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
importorg.apache.commons.fileupload.FileItem;
importorg.apache.commons.fileupload.disk.DiskFileItemFactory;
importorg.apache.commons.fileupload.servlet.ServletFileUpload;
/**
*上传附件
*@authornew
*
*/
publicclassUploadAnnexServletextendsHttpServlet{
privatestaticStringpath="";
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
doPost(request,response);
}
/*
*post处理
*(non-Javadoc)
*@seejavax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
*/
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
path=this.getServletContext().getRealPath("/upload");
try{
DiskFileItemFactoryfactory=newDiskFileItemFactory();
ServletFileUploadup=newServletFileUpload(factory);
Listls=up.parseRequest(request);
for(FileItemfileItem:ls){
if(fileItem.isFormField()){
StringFieldName=fileItem.getFieldName();
//getName()返回的是文件名字普通域没有文件返回NULL
//StringName=fileItem.getName();
StringContent=fileItem.getString("gbk");
request.setAttribute(FieldName,Content);
}else{
Stringnm=fileItem.getName().substring(
fileItem.getName().lastIndexOf("\\")+1);
Filemkr=newFile(path,nm);
if(mkr.createNewFile()){
fileItem.write(mkr);//非常方便的方法
}
request.setAttribute("result","上传文件成功！");
}
}
}catch(Exceptione){
e.printStackTrace();
request.setAttribute("result","上传失败，请查找原因，重新再试！");
}
request.getRequestDispatcher("/pages/admin/annex-manager.jsp").forward(
request,response);
}
}
下载（i/o流）无需导包：
importjava.io.IOException;
importjava.net.URLEncoder;
importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
/**
*下载文件
*@author
*
*/
publicclassDownloadFilesServletextendsHttpServlet{
/**
*
*/
privatestaticfinallongserialVersionUID=8594448765428224944L;
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
doPost(request,response);
}
/*
*处理请求
*(non-Javadoc)
*@seejavax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,javax.servlet.http.HttpServletResponse)
*/
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsServletException,IOException{
Stringname=request.getParameter("fileName");
System.out.print("dddddddddd:"+name);
//web绝对路径
Stringpath=request.getSession().getServletContext().getRealPath("/");
StringsavePath=path+"upload";
//设置为下载application/x-download
response.setContentType("application/x-download");
//即将下载的文件在服务器上的绝对路径
Stringfilenamedownload=savePath+"/"+name;
//下载文件时显示的文件保存名称
Stringfilenamedisplay=name;
//中文编码转换
filenamedisplay=URLEncoder.encode(filenamedisplay,"UTF-8");
response.addHeader("Content-Disposition","attachment;filename="
+filenamedisplay);
try{
java.io.OutputStreamos=response.getOutputStream();
java.io.FileInputStreamfis=newjava.io.FileInputStream(
filenamedownload);
byte[]b=newbyte[1024];
inti=0;
while((i=fis.read(b))>0){
os.write(b,0,i);
}
fis.close();
os.flush();
os.close();
}catch(Exceptione){
}
}
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持毛票票。