HTML5 文件异步上传 — h5uploader.js

原文地址:http://imziv.com/blog/article/read.htm?id=62

之前写过一篇H5异步文件上传的文章, 但是很多朋友看着我的这个教程还是出现很多问题,文章写的不是很好,比较早了。其实通过H5做异步上传已经非常简单了,通过查看文档,便可以很轻松的完成这个功能,当然,如果你不愿意查看文档自己动手的话,那么就用插件咯。h5uploader是我最近封装的HTML5上传插件,代码才白来行,使用的话也比较简单,支持文件大小,类型,progress等等功能。本篇教程,将向你展示Nodejs,Java两种服务端的上传方法,并且附有源代码示例。

插件下载

如果你是bower的用户的话,可以直接通过以下命令:

bower install h5uploader --save

当然也可以直接从Github Clone此项目:

git clone https://github.com/wewoor/h5uploader.git

HTML代码

<input type="file" id="myfile" value="" name="myfile" multiple="multiple"/>
<button id="uploader">Upload</button>

以上是一个file类型的input元素以及一个上传触发按钮,后面带有multiple属性,表示次处支持文件多选上传,当然,你也可以一次提交多个input元素,例如:

<input type="file" id="myfile" value="" name="myfile" multiple="multiple"/>
<input type="file1" id="myfile1" value="" name="myfile" multiple="multiple"/>
<button id="uploader">Upload</button>

这种方法同样是可以的,只不过服务端解析的时候要更麻烦。

Javascript

<script type="text/javascript" src="html5uploader.js"></script>
<script type="text/javascript">
var uploader = document.getElementById('uploader');
uploader.addEventListener("click", function(e) { H5Uploader.upload({
action: 'upload',
id: 'myfile0',
size: {
max: 5000, // 5000kb
valide: function(e) {
if (e) {
alert("The size of " + e.name + " is exceed max value!");
}
}
}, // MB
type: {
name: 'csv;png;jpg',
valide: function(e) {
if (e) {
alert("The type of " + e.name + " is not supported!");
}
}
},
progress: function() {
var p = document.createElement('p');
p.innerHTML = "uploading";
p.id = "loading";
document.body.appendChild(p);
},
success: function(data) {
alert(data);
if (data && data == 200) {
document.getElementById('loading').innerHTML = "The file upload successfully!";
alert("The file upload successfully.");
}
},
fail: function(data) { }
}); }, false);
</script>

以上是针对单个input元素的上传,H5Uploader.upload()方法是支持Array类型和Object类型的,也就是说,如果你有多个input元素同时上传的需求的话,你可以这样写:

   uploader.addEventListener("click", function(e) {

        H5Uploader.upload([{
action: 'upload',
id: 'myfile0',
size: {
max: 5000, // 5000kb
valide: function(e) {
}
}, // MB
type: {
name: 'csv;json',
valide: function(e) {
}
},
progress: function() {
},
success: function(data) {
},
fail: function(data) { }
},{
action: 'upload',
id: 'myfile1',
size: {
max: 5000, // 5000kb
valide: function(e) {
}
}, // MB
type: {
name: 'png;jpg',
valide: function(e) {
}
},
progress: function() {
},
success: function(data) {
},
fail: function(data) { }
}]); }, false);

Nodejs服务端

服务端是expressjs,利用的一个上传中间件multer

var express = require('express');
var multer = require('multer');
var app = express();
var done = false; app.use(express.static('./public')); // respond with "hello world" when a GET request is made to the homepage
app.post('/upload',[multer({dest: './uploads/'}), function(req, res) {
try {
console.log(req.body.myfile);
console.log(req.files);
res.json(200);
} catch (e) {
console.log(e);
}
}]);

完整的示例代码,请看

Java servlet示例

此处没有用任何框架或者库,只是Servlet3.0, 用tomcat6的同学要注意哦。

package com.h5uploader.demo;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter; import javax.servlet.ServletException;
import javax.servlet.annotation.MultipartConfig;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.Part; @MultipartConfig
public class UploaderServlet extends HttpServlet { public void service(HttpServletRequest req, HttpServletResponse res)
throws IOException, ServletException { res.setContentType("text/html;charset=UTF-8"); // Create path components to save the file
final String path = "/Users/ziv/Desktop/";
final Part filePart = req.getPart("myfile0");
final String fileName = getFileName(filePart); OutputStream out = null;
InputStream filecontent = null;
final PrintWriter writer = res.getWriter(); try {
out = new FileOutputStream(new File(path + File.separator
+ fileName));
filecontent = filePart.getInputStream(); int read = 0;
final byte[] bytes = new byte[1024]; while ((read = filecontent.read(bytes)) != -1) {
out.write(bytes, 0, read);
}
writer.println("New file " + fileName + " created at " + path); } catch (FileNotFoundException fne) {
writer.println("You either did not specify a file to upload or are "
+ "trying to upload a file to a protected or nonexistent "
+ "location.");
writer.println("<br/> ERROR: " + fne.getMessage()); } finally {
if (out != null) {
out.close();
}
if (filecontent != null) {
filecontent.close();
}
if (writer != null) {
writer.close();
}
}
} private String getFileName(final Part part) {
final String partHeader = part.getHeader("content-disposition");
for (String content : part.getHeader("content-disposition").split(";")) {
if (content.trim().startsWith("filename")) {
return content.substring(
content.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
} }

以上的上传示例是来自官方的代码,我个人也是测试过的,完整的示例

另外我还写了一个sails的版本,有需要的可以点击查看

结语

以上则是这个插件使用的全部内容,如果有什么问题可以直接点击示例代码进行查看,另外插件是我才写出来的,如果有什么问题请告诉我。谢谢,希望它能帮助你!

作者:Ziv小威

原文地址:http://imziv.com/blog/article/read.htm?id=62

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