Servlet文件上传功能的实现！

Servlet文件上传功能的实现！

声明：使用了第三方fileupload jar包

commons-fileupload-1.2.1.jar 以及commons-io-1.3.2.jar

1.创建DiskFileItemFactory 磁盘文件条目工厂—-对象

2.创建ServletFileUpload 文件上传对象 构造方法传“工厂”

3.用文件上传对象的isMultipart（）方法request请求是否为文件上传–不是则return

4.用文件上传对象的parseRequest（）方法转换request为文件对象 返回List集合对象

5.遍历每一个FileItem，并判断item是否为表格区域，如果是执行相应操作，如果不是执行不同的操作

package com.stx.servlet;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.apache.commons.fileupload.FileItem;

import org.apache.commons.fileupload.FileUploadException;

import org.apache.commons.fileupload.disk.DiskFileItemFactory;

import org.apache.commons.fileupload.servlet.ServletFileUpload;

/*

*@author:David admin@dxscx.com

*@Version: 1.0

*@Description:  What do you want to do?

*@Time:2016-5-31  下午5:53:49

*/

public class Upload extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

request.setCharacterEncoding("UTF-8");

response.setCharacterEncoding("UTF-8");

//实例化磁盘文件条目工厂

DiskFileItemFactory factory =new DiskFileItemFactory();

//实例化Servlet文件上传对象

ServletFileUpload upload=new ServletFileUpload(factory);

//判断request请求是否为文件上传

if(!upload.isMultipartContent(request)){

return;

}

//获得转换后的文件list集合

FileOutputStream fos=null;

InputStream is =null;

try {

List<FileItem> list=upload.parseRequest(request);

//遍历集合list

for(FileItem item:list){

//判断是否为表格数据

if(item.isFormField()){

//表格内容处理相应（键值对）

String key_name=item.getFieldName();//获取字段名

String key_value=item.getString();//获取相应值

//System.out.println(key_name);

System.out.println("key_name:\t"+key_name+",key_value:\t"+key_value);

}else{

//上传为文件内容

String filename=item.getName();

System.out.println("文件名："+filename);

//获取项目实际路径存储于upload文件夹下

String path = getServletContext().getRealPath("/")+"upload\\";

//判断该路径是否为文件夹或者已经存在，不能同事满足则创建文件夹

File file = new File(path);

if(!(file.isDirectory()&file.exists())){

file.mkdirs();

}

//System.out.println(path); 输出路径查看测试

//创建文件输出流对象

fos=new FileOutputStream(path+filename);

//从上传的文件获得输入流

is = item.getInputStream();

byte[] b = new byte[1024];

int len = -1;

//读取输入流写入文件

while((len=is.read(b))!=-1){

fos.write(b, 0, len);

fos.flush();

}

}

}

} catch (FileUploadException e) {

e.printStackTrace();

}finally{

fos.close();

is.close();

}

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

}