servlet实现文件上传

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jsp&servlet

jsp servlet 文件上传

第一步:

1.利用第三方提供的包,可以实现文件上传的功能(多文件),去http://commons.apache.org/下载相应的jar包:

fileupload的下载地址:http://commons.apache.org/fileupload/download_fileupload.cgi

IO的下载地址:http://commons.apache.org/io/download_io.cgi

2.将下载好的文件解压,添加相应的jar包到你的项目中:

第二步:

1.新建立jsp文件,文件代码如下:

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>上传文件</title>
</head>
<body>
<!-- method必须为post提交的方式 -->
<!-- enctype必须修改为multipart/form-data,二进制流的方式 -->
<form action="UploadImageServlet" method="post" enctype="multipart/form-data">
	<label>文件名:</label><input type="text" name="filename"><br />
	文件1:<input type="file" name="file1"><br />
	文件2:<input type="file" name="file2"><br />
	<input type="submit" value="提交">
</form>
</body>
</html>

2.新建立servlet文件,文件代码如下:

package com;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
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.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;

public class UploadImageServlet extends HttpServlet {

	private static final long serialVersionUID = -5961815049833963816L;

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		doPost(req,resp);
	}

	@Override
	protected void doPost(HttpServletRequest req, HttpServletResponse resp)
			throws ServletException, IOException {
		req.setCharacterEncoding("UTF-8");
		DiskFileItemFactory factory = new DiskFileItemFactory();
		String path = req.getSession().getServletContext().getRealPath("/upload");
		System.out.println("上传文件路径为:"+path);
		factory.setRepository(new File(path));
		factory.setSizeThreshold(1024*1024);
		ServletFileUpload upload = new ServletFileUpload(factory);
		try{
			List<FileItem> list = (List<FileItem>)upload.parseRequest(req);
			for(FileItem item : list){
				String name = item.getFieldName();
				System.out.print("表单名字:"+name+"   ");
				if(item.isFormField()){
					String value = item.getString();
					System.out.println("表单值:"+value+"   ");
				}else{
					String value = item.getName();
					System.out.print("文件名字:"+value+"   ");
					OutputStream out = new FileOutputStream(new File(path,value));
					InputStream in = item.getInputStream();
					int length = 0 ;  
                    byte [] buf = new byte[1024];
                    System.out.println("获取上传文件的总共的容量:"+item.getSize());
                    while( (length = in.read(buf) ) != -1){
                    	out.write(buf, 0, length);
                    }
                    in.close(); 
                    out.close();
				}
			}
			System.out.println("文件上传成功...");
		}catch(Exception e){
			e.printStackTrace();
		}
	}
}

3.浏览器浏览upload.jsp页面,提交form表单,表单内容如下: