JSP servlet实现文件上传下载和删除

2023-09-19 06:54:05 58

本文实例为大家分享了Android九宫格图片展示的具体代码，供大家参考，具体内容如下

由于存储空间，对一般用户而言，就是用来操作存储文件的，所以这两天，特意看了一下windows下用servlet实现文件上传、下载和删除，下面是详细代码说明

上传：

用的是commons-fileupload-1.2.2.jar和commons-io-2.0.1.jar组件，可以去apache官网上去下载，然后放到WebRoot/WEB-INF/lib目录下

upload.html




Fileupload





File:

web.xml里加上下面几行：


Upload
am.demo.Upload


Upload
/fileupload

src目录下新建文件Upload.java：

packageam.demo;

importjava.io.File;
importjava.io.IOException;
importjava.util.Iterator;
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;

@SuppressWarnings("serial")
publicclassUploadextendsHttpServlet{
privateStringuploadPath="d://temp";//上传文件的目录

@SuppressWarnings("unchecked")
publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsIOException,ServletException{
try{
//Createafactoryfordisk-basedfileitems
DiskFileItemFactoryfactory=newDiskFileItemFactory();


//Createanewfileuploadhandler
ServletFileUploadupload=newServletFileUpload(factory);


Listitems=upload.parseRequest(request);//得到所有的文件
Iteratori=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);
}
}

response.setContentType("text/html;charset=GBK");
response.getWriter().print(
"");
}catch(Exceptione){
//可以跳转出错页面
e.printStackTrace();
}
}

publicvoidinit()throwsServletException{
FileuploadFile=newFile(uploadPath);
if(!uploadFile.exists()){
uploadFile.mkdirs();
}
}
}

再看下载Downlaod.java:

packageam.demo;

importjava.io.File;
importjava.io.FileInputStream;
importjava.io.IOException;
importjava.io.OutputStream;

importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
publicclassDownloadextendsHttpServlet{
publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsIOException,ServletException{


StringaFileName=newString(request.getParameter("name").getBytes(
"iso8859-1"),"gbk");

FilefileLoad=newFile("d:/temp",aFileName);

FileInputStreamin=null;//输入流
OutputStreamout=response.getOutputStream();
byteb[]=newbyte[1024];

try{

response.setContentType("application/x-msdownload;");

response.setHeader("Content-disposition","attachment;filename="
+newString(aFileName.getBytes("GBK"),"ISO-8859-1"));

//downloadthefile.
in=newFileInputStream(fileLoad);
intn=0;
while((n=in.read(b))!=-1){
out.write(b,0,n);
}

}catch(Throwablee){
e.printStackTrace();
}finally{
try{
in.close();
out.close();
}catch(Throwablee){
e.printStackTrace();
}
}
}

publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsIOException,ServletException{
doGet(request,response);
}

}

删除Delete.java:

packageam.demo;

importjava.io.File;
importjava.io.FileNotFoundException;
importjava.io.IOException;

importjavax.servlet.ServletException;
importjavax.servlet.http.HttpServlet;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;

@SuppressWarnings("serial")
publicclassDeleteextendsHttpServlet{

publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)
throwsFileNotFoundException,IOException{

StringaFileName=newString(request.getParameter("name").getBytes(
"iso8859-1"),"gbk");

Filefile=newFile("d:/temp",aFileName);

response.setContentType("text/html;charset=GBK");

if(!file.isDirectory()){
file.delete();
response.getWriter().print(
"");
}else{

}

}

publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)
throwsIOException,ServletException{
doGet(request,response);
}
}

因为ubuntuserver是黑屏，本人用的是ubuntuserver10.04，不方便用浏览器来查看文件，因为没有图形界面，也不方便调试，所以可以先在windows上测试通过，然后把相应文件拷到ubuntuserver中的tomcat相应目录下，可以通过samba来传文件，但遇到一个问题，就是中文乱码的问题，因为在开始安装时，选的是英文，后面用网上的一些办法，还是没有解决中文乱码的问题，有知道的大侠，还烦请转告。

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。

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JSP servlet实现文件上传下载和删除

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