使用smartUpload实现文件的上传与下载

文件的下载

1.在项目中引入smartupload.jar,放在WEB_INF的lib下面

2.在upload.jsp页面中

<form name="form1" id="form1" method="post" action="cs/toUploadFile.jsp" enctype="multipart/form-data">

<input type="file" name="file1"><br/>

<input type="submit" name="submit" value="提交">

</form>

3.在toUploadFile.jsp页面中

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

<%@ page import="com.jspsmart.upload.*,java.io.File"%>

<%

//SmartUpload类用于实现文件的上传与下载操作

SmartUpload su=new SmartUpload("UTF-8");

//初始化su对象

su.initialize(pageContext);

//准备文件的上传

su.upload();

//获取上传的文件

SmartFile sf=su.getFiles().getFile(0);

String newFileName=sf.getFileName();

//使用相对路径

String sitePath=request.getRealPath("/");

File f=new File(sitePath);

//使用物理路径

//File f=new File("D:\\FileUpload");

if(!f.exists()){
//如果不存在目录，创建一个目录
f.mkdir();

}

//String filePath="D:\\FileUpload\\"+newFileName;

String filePath=sitePath+"\\FileUpload\\"+newFileName;

try{
sf.saveAs(filePath,SmartFile.SAVEAS_PHYSICAL);

}

catch (Exception ex){
out.println("<script>alert('文件上传失败');location.href='../uploadFile.jsp';</script>");

} 

out.println("<script>alert('文件上传成功');location.href='../uploadFile.jsp';</script>");

%>

下载文件

1.在downLoad.jsp页面中

<table id="table1" border="1px">

<tr><th>文件名</th><th>文件类型</th><th>文件大小</th><th>操作</th></tr>

<%

String filePath=request.getRealPath("/")+"\\FileUpload";

java.io.File f=new java.io.File(filePath);

//java.io.File f=new java.io.File("D:\\FileUpload");

if(f.isDirectory()){
java.io.File[] fArr=f.listFiles();
for(java.io.File fi: fArr){
//获取文件名字
String filename=fi.getName();
//获取文件的扩展名
String fileEx=fi.getName().substring(fi.getName().lastIndexOf("."));
//获取文件的大小
long fileSize=fi.length()/1024;    
%>
<tr><td><%=filename %></td><td><%=fileEx %></td><td><%=fileSize %></td>
<td>
<form name="form2" id="form2" method="post" action="cs/toDownloadFile.jsp" >
<input type=hidden name="filename" value="<%=filename %>"><br/>
<input type=hidden name="eventTarget" id="eventTarget" value="down"><br/>
<input type="submit" name="submit1" value="下载">
<input type="button" name="button1" value="删除" onclick="btnDel_click()">
</form>
</td>
</tr>
<%
}

}

%>

</table>

2.在toDownloadFile.jsp页面中

<%@ page language="java" contentType="text/html; charset=UTF-8"

    pageEncoding="UTF-8"%>

    <%@ page import="com.jspsmart.upload.*,java.io.File"%>

    <%

    request.setCharacterEncoding("UTF-8");

    String et=request.getParameter("eventTarget");

    if(et.equals("down")){ 

    String downFileName=request.getParameter("filename");

    String downPath=request.getRealPath("/")+"\\FileUpload\\"+downFileName;

    //SmartUpload类用于实现文件的上传与下载操作

    SmartUpload su=new SmartUpload("UTF-8");

    //初始化su对象

    su.initialize(pageContext);    

    su.setContentDisposition(null);

    try{

    su.downloadFile(downPath);

    }

    catch(Exception ex){

    out.println("<script>alert('下载文件失败');location.href='../uploadFile.jsp';</script>");

    }

    //bug问题

    out.clear();

    out=pageContext.pushBody();

    }

    else{ 

    String delFileName=request.getParameter("filename");

    String delPath=request.getRealPath("/")+"\\FileUpload\\"+delFileName;

    java.io.File f=new java.io.File(delPath);

    if(f.exists()){  

    if(f.delete()){

    out.println("<script>alert('删除成功');location.href='../uploadFile.jsp';</script>");

    }

    }

    }

    %>