网页文件
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>利用Ajax上传二进制文件title>
<script type="text/javascript">window.onload = function() {var file = null,fileName = null,xhr = null;function upload(url) {var fileInput = document.getElementById("fileInput");fileInput.addEventListener("change", function() {file = this.files[0];fileName = file.name;xhr = new XMLHttpRequest();xhr.open("POST", url);xhr.send(file); }, false);}var uploadBtn = document.getElementById("upload");uploadBtn.onclick = function() {upload("/Ajax/FileUploader");};};
script>
head>
<body><input type="file" id="fileInput" multiple><input type="button" id="upload" value="click to upload">
body>
html>
后台简单处理
package cn.chd.fileupload;import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class FileUploader extends HttpServlet {private static final long serialVersionUID = 1L;int count = 1;protected void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {String path = this.getServletContext().getRealPath("/upload");InputStream in = request.getInputStream();String contentType = request.getContentType();String extention = contentType.substring(contentType.indexOf('/') + 1);OutputStream out = new FileOutputStream(path + "\\" + (count++) + "." + extention);int len = -1;byte[] buffer = new byte[1024];while ((len = in.read(buffer)) != -1) {out.write(buffer, 0, len);}in.close();out.close();}protected void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doGet(request, response);}}
