文件上传下载---上传篇

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文件上传到本地磁盘同时将信息出入数据库：

上传JSP页面中利用js能添加多个文件同时上传：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
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>
<title>上传页面</title>

<script type="text/javascript">
function addfiles(){
var filesDiv = document.getElementById("files");
var fileInput = document.createElement("input");

fileInput.type="file";
fileInput.name="浏览";

var delButton = document.createElement("input");
delButton.type="button";
delButton.value="删除";

delButton.onclick=function del(){
this.parentNode.parentNode.removeChild(this.parentNode);

}
var div = document.createElement("div");
div.appendChild(fileInput);
div.appendChild(delButton);

filesDiv.appendChild(div);
}

</script>

</head>

<body>
<form action="${pageContext.request.contextPath }/uploadServlet.do" method="post" enctype="multipart/form-data">
<table>
<tr>
<td>用户名:</td><td><input type="text" name="username"/></td><td></td>
</tr>
<tr>
<td></td><td><input type="button" value="添加文件" onclick="addfiles()"/></td><td></td>
</tr>
<tr>
<td></td><td><input type="file" name="浏览"/></td><td></td>
</tr>
<tr>
<td></td><td><div id="files"></div></td><td></td>
</tr>
<tr>
<td></td><td><input type="submit" value="上传"/></td><td></td>
</tr>
</table>
</form>

${message}
</body>
</html>

最终要的是servlet中

package cn.csdn.web.servlet;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.sql.Blob;
import java.sql.SQLException;
import java.util.List;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.sql.rowset.serial.SerialBlob;
import javax.sql.rowset.serial.SerialException;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase.FileSizeLimitExceededException;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import sun.print.resources.serviceui;
import cn.csdn.web.dao.UploadDao;
import cn.csdn.web.dao.UploadDaoImpl;
import cn.csdn.web.domain.Upload;

public class UploadFilesServlet extends HttpServlet {
/**
* @author sword
*/
private static final long serialVersionUID = 1L;

UploadDao uDao = new UploadDaoImpl();
Upload entity = new Upload();
@SuppressWarnings({ "unchecked", "unchecked" })
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("utf-8");
try {
//1、创建工厂对象
DiskFileItemFactory factory = new DiskFileItemFactory();
//2、设置临时文件路径
factory.setRepository(new File("d:\\test"));
//3、得到上传文件解析器
ServletFileUpload upload = new ServletFileUpload(factory);
//4、处理乱码问题
upload.setHeaderEncoding("utf-8");
//5、设定文件上传大小限制
//upload.setSizeMax(1024*1024);
//6、进行解析得到存放FileItem的List对象
List<FileItem> list ;
list = upload.parseRequest(request);
for(FileItem item : list){
if(item.isFormField()){
String paramName = item.getFieldName();
String paramValue = item.getString("utf-8");
System.out.println("普通输入项" + paramName + " = " + paramValue);

entity.setName(paramValue);
}else{
//获取上传文件名
String fileName = item.getName();
//如果文件名有目录，则去掉目录部分，只保留文件名
fileName = fileName.substring(fileName.lastIndexOf("\\")+1);
System.out.println("name = " + fileName);

if(!fileName.equals("")){
//处理同名问题名字前加UUID处理调用refactorFile方法
String uuidName = refactorFileName(fileName);
System.out.println("uuidName==="+uuidName);//测试代码
entity.setFileName(uuidName);//将信息存入到数据库中

InputStream is = item.getInputStream();

//上传文件位置生成指定的二级路径调用方法

String basepath = this.getServletContext().getRealPath("WEB-INF/upload");
String finalPath = generateFilePath(basepath,uuidName);//文件的完整路径+名字+后缀
String finalName = finalPath.substring(finalPath.indexOf("_")+1);//得到文件的真实名字
System.out.println("finalName==="+finalName);
entity.setFilePath(finalPath);//将信息存入到数据库中
entity.setFile(item.get());//将上传文件存入到数据库中

File file = new File(finalPath);
FileOutputStream fos = new FileOutputStream(file);

byte[] buffer = new byte[1024];
int len = 0;
while((len=is.read(buffer))!=-1){
fos.write(buffer, 0, len);
}

uDao.insert(entity);

fos.flush();
fos.close();
is.close();
item.delete();
request.setAttribute("message", "文件上传成功");

}
}
}
}catch(FileSizeLimitExceededException e1){
e1.printStackTrace();
request.setAttribute("message", "上传文件尺寸太大！！！");
}catch(FileUploadException e){
e.printStackTrace();
request.setAttribute("message", "bbbb文件上传失败");

}
request.getRequestDispatcher("/upload.jsp").forward(request, response);
}

private String generateFilePath(String basepath, String uuidName) {
int hashcode = uuidName.hashCode();
int dir1 = hashcode & 0xf;
int dir2 = (hashcode >> 4) & 0xf;

String path = basepath+"\\"+dir1+"\\"+dir2+"\\";

File f = new File(path);
if(!f.exists()){
f.mkdirs();
}
return path+uuidName;
}

private String refactorFileName(String fileName) {
return UUID.randomUUID().toString()+"_"+fileName;
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doGet(request, response);
}

}