文件上传下载
1。上传文件流程
先通过用户提交文件，保存文件到服务器端，然后在写入数据库中，每次到下载页面时从数据库中读出文件，生成文件在服务器目录中，以下。。。
?
文件上传后保存文件到服务器中jsp，
upFile.jsp
<%@ page contentType="text/html; charset=utf-8" language="java" %>
< import="java.util.List;"%>
<html>
<head>
<title>上传文件</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<base target="_self">
<link href="Css/style.css" rel="stylesheet">
<script type="text/javascript">
??? function check(){
??????? var file = document.getElementById("file1").value;
??????? if(file == ""){
????????? alert('请选择要上传的文件');
????????? return false;
???????? }else{
????????? window.returnValue=file;
????????? return true;
???????? }
?????? }
</script>
</head>
<body>
<%
String files=request.getParameter("files");
%>
<form name="form2" enctype="multipart/form-data" method="post" action="../MissionManage/commonfile.jsp?files=<%=files %>" onsubmit="return check();">
<center>
<table align="center" width="350" height="150" border="0" cellpadding="0" cellspacing="0"><!-- background="images/upFile_bg.gif -->
??? <tr>
????? <td valign="top"><table width="100%" height="145" border="0" cellpadding="0" cellspacing="0">
??????? <tr>
????????? <td height="49" colspan="2"> </td>
??????? </tr>
??????? <tr>
????????? <td width="9%" height="53"> </td>
????????? <td width="91%"><b>请选择上传的文件：</b><br>
??????????? <input id="file1" name="file1" type="file" size="35" onkeydown="return false;">
??????????? <br>
??????????? 注：文件大小请控制在10M以内。</td>
??????? </tr>
??????? <tr>
??????????? <td colspan="2" align="center"><input name="Submit" type="submit" value="确认">
???????????
??????????? <input name="Submit2" type="button" onClick="window.close()" value="关闭"></td>
??????? </tr>
????? </table></td>
??? </tr>
</table>
</center>
</form>
</body>
</html>
commonfile.jsp
<%@ page language="java" import="java.io.*" pageEncoding="UTF-8"%>
< import="java.util.*,org.apache.commons.fileupload.FileItem" %>
< import="java.text.SimpleDateFormat,java.util.Date" %>
< import="com.PoliceSystem.tools.FileOperate" %>
<jsp:useBean id="factory" scope="page" />
<jsp:useBean id="upload" scope="page" />
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
??? <base href="<%=basePath%>">
????
??? <title>上传文件</title>
????
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<base target="_self">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
<script type="text/javascript" language="javascript">
??? </script>
</head>
<body>
?? <%?
???? request.setCharacterEncoding("UTF-8");?
???? String path1 = (String)request.getRealPath("/upload1");
?????
???? String files=request.getParameter("files");
???? String[] fileList=files.split(";");
?????
???? File file = new File(path1);?
???
if(!file.exists()){?
???? file.mkdirs();?
}?
???? factory.setRepository(file);?
???? factory.setSizeThreshold(1024*1024);?
?????
???? upload.setFileItemFactory(factory);
???? ???
???? try{?
???? List<FileItem> list= upload.parseRequest(request);?
??????? for(FileItem item:list){?
????? if(item.isFormField()){?
??????? //String value=item.getString("UTF-8");?
??????? //session.setAttribute("fileName", value); ???????
????? }else{?
??????? String value=item.getName();?
??????? int start=value.lastIndexOf("\");?
??????? String fileName=value.substring(start+1);?
??????? if(fileName.length() == 0 || fileName == ""){?
??????????? out.println("<script>alert('上传失败');window.close();</script>");?
??????? }else{????????
???????? if(item.getSize()>10000000){
?????????? out.println("<script>alert('对不起，您上传的文件超过10M,无法完成上传！');window.close();</script>");?
???????? }else{
?????????? SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddHHmmss");?
????????????? Date date =new Date();
????????????? String[] f = item.getName().split("\\\");
????????????? //System.out.println(f[f.length-1]);
????????????? String oldFileName = f[f.length-1];
????????????? for(int i=0;i<fileList.length;i++){
????????????? if(fileList[i].indexOf(oldFileName)!=-1){
????????????? ?? out.println("<script>alert('对不起，您上传的文件与现有上传的文件重名，请更换文件名重新上传！');window.returnValue='';window.close();</script>");
????????????? }
????????????? }
????????????? String fType = FileOperate.getFileType(item.getName());//文件类型
?????????? fileName = sdf.format(date)+"."+fType;//新文件名
?????????? //System.out.println(item.getName()+"---"+fileName);
?????????? item.write(new java.io.File(path1,fileName));
?????????? //////--1--/////
?????????? String mailFileNames = new String();
?????????? String old = (String)session.getAttribute("fuJianFileNames");
??????? if(old!=null){
????????? mailFileNames = old;
??????? }
??????? mailFileNames+=oldFileName+"|"+fileName+";";?
??????? //System.out.println("mailFileNames="+mailFileNames);????
??????? session.removeAttribute("fuJianFileNames");
??????? session.setAttribute("fuJianFileNames", mailFileNames);?
?????????? //////--2--/////
?????????? //String pathName = path1+";
?????????? //System.out.println("pathName="+pathName);???????????
?????????? out.println("<script>window.close();</script>");?
???????? }
??????? }????????
????? }
??????? }
??? }catch (Exception e) {
?????? e.printStackTrace();
?????? out.println("<script>window.close();</script>");
??? }
?? %>
</body>
</html>
?
插入文件数据到数据库中
public boolean insert_annex(String[] str){
?? boolean b=true;
?? String sql ="";
?? con = db.getConn();
?? try{
??? sql="insert into annex (querykey,sfilename,committime,Filetype,filepath,pno,Annex) values (?,?,?,?,?,?,?)";
??? ps = con.prepareStatement(sql);
??? for(int i=0;i<str.length-1;i++){
???? ps.setString(i+1, str[i]);
??? }
??? File file = new File(str[6]);//附件
???
??? InputStream iso = new FileInputStream(file);
??? ps.setBinaryStream(7, iso, iso.available());
??? ps.execute();
??? iso.close();
??? System.out.println("删除临时文件：" + file.delete());// 删除tmp文件
?? }catch(Exception e){
??? b=false;
??? e.printStackTrace();
?? }finally{
??? this.close();
?? }
?? return b;
}
读出文件数据，并保存
public boolean addTempFile_annex(String querykey,HttpServletRequest request){
?? boolean b=true;
?? con = db.getConn();
?? InputStream in = null;
?? OutputStream out= null;??
?? String path1 = (String)request.getRealPath("/upload1");//文件下载临时目录
?? try{
??? String sql="select filePath,annex from annex where querykey='"+querykey+"'";
??? //String sql_1="select annex from annex where querykey='"+querykey+"'";
???
??? ps = con.prepareStatement(sql);
??? rs=ps.executeQuery();
??? while(rs.next()){
???? File f = new File(path1+rs.getString("filepath"));
???? in=rs.getBinaryStream("annex");
???? out = new FileOutputStream(f);
???? int len = 10 * 100 * 100; //定义字符数组长度
???? byte[] P_Buf=new byte[len];
???? int j;
?????? while((j=in.read(P_Buf))!=-1){
?????? ?? out.write(P_Buf, 0, j);
????????? }
??? }
??? in.close();
??????????? out.flush(); //强制清出缓冲区
??????????? out.close();
?? }catch(Exception e){
??? b=false;
??? e.printStackTrace();
?? }finally{
??? this.close();
?? }
?? return b;
}
给定传递过来的参数（文件名，文件存储在服务器的文件名，文件在服务器的路径，文件类型），下载文件Action
package com.PoliceSystem.action.mail;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
public class downLoadFile extends ActionSupport{
private static final long serialVersionUID = -2207648627734251737L;
public String execute() throws Exception{
?? HttpServletRequest request = ServletActionContext.getRequest();
?? HttpServletResponse response = ServletActionContext.getResponse();
??
?? String fileminitype = request.getParameter("fileType");
?? String filename1 = new String(request.getParameter("fileName1").getBytes("ISO8859-1"),"UTF-8");
?? String filename2 = new String(request.getParameter("fileName2").getBytes("ISO8859-1"),"UTF-8");
?? String filepath = request.getRealPath("/upload1");
?? File f = new File(filepath+");
?? Long filelength = f.length();
?? int cacheTime = 10;
??
?? response.setContentType(fileminitype);
?? response.setHeader("Location",filename1);
?? response.setHeader("Cache-Control", "max-age=" + cacheTime);
??
?? response.setContentType("application/octet-stream");
?? byte[] b = filename1.getBytes("GBK");???
?? filename1 = new String(b,"8859_1");???
?? response.setHeader("Content-Disposition", "attachment;filename=" + filename1);?
?? response.setContentLength(filelength.intValue());
?? OutputStream outputStream = response.getOutputStream();
?? InputStream inputStream = new FileInputStream(f);
?? byte[] buffer = new byte[1024];
?? int i = -1;
?? while ((i = inputStream.read(buffer)) != -1) {
??? outputStream.write(buffer, 0, i);
?? }
???
?? outputStream.flush();
?? outputStream.close();
?? inputStream.close();
??
?? return null ;
???? }
}
