百度的webUploader的前端开源插件实现的大文件分片上传功能
前端部分
前端页面代码如下，只需要修改自己的文件上传地址接口地址：
<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>
Web Uploader
</title>
<link rel="shortcut icon" href="http://fex.baidu.com/webuploader/images/favicon.ico">
<link rel="stylesheet" type="text/css" href="js/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="js/bootstrap-theme.min.css">
<link rel="stylesheet" type="text/css" href="js/font-awesome.min.css">
<link rel="stylesheet" type="text/css" href="js/syntax.css">
<link rel="stylesheet" type="text/css" href="js/style.css">
<link rel="stylesheet" type="text/css" href="js/webuploader.css">
<link rel="stylesheet" type="text/css" href="js/demo.css">
</head>
<body>
<div id="wrapper">
<div class="page-body">
<div id="post-container" class="container">
<div class="page-container">
<h1 id="demo">Demo</h1>
<p>您可以尝试文件拖拽，使用QQ截屏工具，然后激活窗口后粘贴，或者点击添加图片按钮</p>
<div id="uploader" class="wu-example">
<div class="queueList">
<div id="dndArea" class="placeholder">
<div id="filePicker" class="webuploader-container">
<div class="webuploader-pick">点击选择图片</div>
<div id="rt_rt_1ctrotb75hv81prnco2vi318qc1" style="position: absolute; top: 0px; left: 448px; 168px; height: 44px; overflow: hidden; bottom: auto; right: auto;"><input type="file" name="file" class="webuploader-element-invisible" multiple="multiple" accept="image/*">
<label style="opacity: 0; 100%; height: 100%; display: block; cursor: pointer; background: #ffffff;"></label>
</div>
</div>
<p>或将照片拖到这里，单次最多可选300张</p>
</div>
<ul class="filelist"></ul>
</div>
<div class="statusBar" style="display:none;">
<div class="progress" style="display: none;">
<span class="text">0%</span>
<span class="percentage" style=" 0%;"></span>
</div><div class="info">共0张（0B），已上传0张</div>
<div class="btns">
<div id="filePicker2" class="webuploader-container"><div class="webuploader-pick">继续添加</div><div id="rt_rt_1ctrotb7j4opkv31e231b79k0a6" style="position: absolute; top: 0px; left: 0px; 1px; height: 1px; overflow: hidden;"><input type="file" name="file" class="webuploader-element-invisible" multiple="multiple" accept="image/*"><label style="opacity: 0; 100%; height: 100%; display: block; cursor: pointer; background: #ffffff;"></label></div></div><div class="uploadBtn state-pedding">开始上传</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<script type="text/javascript">
var BASE_URL = '/webuploader';
</script>
<script type="text/javascript" src="js/jquery-1.10.2.min.js"></script>
<script type="text/javascript" src="js/bootstrap.min.js"></script>
<script type="text/javascript" src="js/global.js"></script>
<script type="text/javascript" src="js/webuploader.js"></script>
<script type="text/javascript" src="js/demo.js"></script>
</body>
</html>
前端js代码 demo.js，需要修改插件初始化的参数，和文件上传成功后的合并通知的地址。
jQuery(function() {
var $ = jQuery, // just in case. Make sure it's not an other libaray.
$wrap = $('#uploader'),
// 图片容器
$queue = $('<ul class="filelist"></ul>')
.appendTo( $wrap.find('.queueList') ),
// 状态栏，包括进度和控制按钮
$statusBar = $wrap.find('.statusBar'),
// 文件总体选择信息。
$info = $statusBar.find('.info'),
// 上传按钮
$upload = $wrap.find('.uploadBtn'),
// 没选择文件之前的内容。
$placeHolder = $wrap.find('.placeholder'),
// 总体进度条
$progress = $statusBar.find('.progress').hide(),
// 添加的文件数量
fileCount = 0,
// 添加的文件总大小
fileSize = 0,
// 优化retina, 在retina下这个值是2
ratio = window.devicePixelRatio || 1,
// 缩略图大小
thumbnailWidth = 110 * ratio,
thumbnailHeight = 110 * ratio,
// 可能有pedding, ready, uploading, confirm, done.
state = 'pedding',
// 所有文件的进度信息，key为file id
percentages = {},
supportTransition = (function(){
var s = document.createElement('p').style,
r = 'transition' in s ||
'WebkitTransition' in s ||
'MozTransition' in s ||
'msTransition' in s ||
'OTransition' in s;
s = null;
return r;
})(),
uploader;
if ( !WebUploader.Uploader.support() ) {
alert( 'Web Uploader 不支持您的浏览器！如果你使用的是IE浏览器，请尝试升级 flash 播放器');
throw new Error( 'WebUploader does not support the browser you are using.' );
}
// 实例化
uploader = WebUploader.create({
pick: {
id: '#filePicker',
label: '点击选择图片'
},
dnd: '#uploader .queueList',
paste: document.body,
/* accept: {
title: 'Images',
extensions: 'gif,jpg,jpeg,bmp,png',
mimeTypes: 'image/*'
},*/
// swf文件路径
swf: BASE_URL + '/js/Uploader.swf',
disableGlobalDnd: true,
//分片
chunked: true,
//每片大小 2M
chunkSize: 20097152,
//单片失败后重试次数
chunkRetry: 10,
//上传并发线程数
thread: 1,
// server: 'http://webuploader.duapp.com/server/fileupload.php',
server: 'http://localhost:8080/uploadFile',
fileNumLimit: 300,
fileSizeLimit: 2000* 1024 * 1024, // 2000 M
fileSingleSizeLimit: 1000 * 1024 * 1024 // 1000 M
});
// 添加“添加文件”的按钮，
uploader.addButton({
id: '#filePicker2',
label: '继续添加'
});
// 当有文件添加进来时执行，负责view的创建
function addFile( file ) {
var $li = $( '<li id="' + file.id + '">' +
'<p class="title">' + file.name + '</p>' +
'<p class="imgWrap"></p>'+
'<p class="progress"><span></span></p>' +
'</li>' ),
$btns = $('<div class="file-panel">' +
'<span class="cancel">删除</span>' +
'<span class="rotateRight">向右旋转</span>' +
'<span class="rotateLeft">向左旋转</span></div>').appendTo( $li ),
$prgress = $li.find('p.progress span'),
$wrap = $li.find( 'p.imgWrap' ),
$info = $('<p class="error"></p>'),
showError = function( code ) {
switch( code ) {
case 'exceed_size':
text = '文件大小超出';
break;
case 'interrupt':
text = '上传暂停';
break;
default:
text = '上传失败，请重试';
break;
}
$info.text( text ).appendTo( $li );
};
if ( file.getStatus() === 'invalid' ) {
showError( file.statusText );
} else {
// @todo lazyload
$wrap.text( '预览中' );
uploader.makeThumb( file, function( error, src ) {
if ( error ) {
$wrap.text( '不能预览' );
return;
}
var img = $('<img src="'+src+'">');
$wrap.empty().append( img );
}, thumbnailWidth, thumbnailHeight );
percentages[ file.id ] = [ file.size, 0 ];
file.rotation = 0;
}
file.on('statuschange', function( cur, prev ) {
if ( prev === 'progress' ) {
$prgress.hide().width(0);
} else if ( prev === 'queued' ) {
$li.off( 'mouseenter mouseleave' );
$btns.remove();
}
// 成功
if ( cur === 'error' || cur === 'invalid' ) {
console.log( file.statusText );
showError( file.statusText );
percentages[ file.id ][ 1 ] = 1;
} else if ( cur === 'interrupt' ) {
showError( 'interrupt' );
} else if ( cur === 'queued' ) {
percentages[ file.id ][ 1 ] = 0;
} else if ( cur === 'progress' ) {
$info.remove();
$prgress.css('display', 'block');
} else if ( cur === 'complete' ) {
$li.append( '<span class="success"></span>' );
alert("此文件已成功");
console.log("========="+file.size);
if(file.size>20097152){
$.post("http://localhost:8080/mergingChunks",{"id":file.id,"name":file.name,"size":file.size,"lastModifiedDate":file.lastModifiedDate},
function(data,status){
alert("Data: " + data + "
Status: " + status);
});
}
}
$li.removeClass( 'state-' + prev ).addClass( 'state-' + cur );
});
$li.on( 'mouseenter', function() {
$btns.stop().animate({height: 30});
});
$li.on( 'mouseleave', function() {
$btns.stop().animate({height: 0});
});
$btns.on( 'click', 'span', function() {
var index = $(this).index(),
deg;
switch ( index ) {
case 0:
uploader.removeFile( file );
return;
case 1:
file.rotation += 90;
break;
case 2:
file.rotation -= 90;
break;
}
if ( supportTransition ) {
deg = 'rotate(' + file.rotation + 'deg)';
$wrap.css({
'-webkit-transform': deg,
'-mos-transform': deg,
'-o-transform': deg,
'transform': deg
});
} else {
$wrap.css( 'filter', 'progid:DXImageTransform.Microsoft.BasicImage(rotation='+ (~~((file.rotation/90)%4 + 4)%4) +')');
}
});
$li.appendTo( $queue );
}
// 负责view的销毁
function removeFile( file ) {
var $li = $('#'+file.id);
delete percentages[ file.id ];
updateTotalProgress();
$li.off().find('.file-panel').off().end().remove();
}
function updateTotalProgress() {
var loaded = 0,
total = 0,
spans = $progress.children(),
percent;
$.each( percentages, function( k, v ) {
total += v[ 0 ];
loaded += v[ 0 ] * v[ 1 ];
} );
percent = total ? loaded / total : 0;
spans.eq( 0 ).text( Math.round( percent * 100 ) + '%' );
spans.eq( 1 ).css( 'width', Math.round( percent * 100 ) + '%' );
updateStatus();
}
function updateStatus() {
var text = '', stats;
if ( state === 'ready' ) {
text = '选中' + fileCount + '张图片，共' +
WebUploader.formatSize( fileSize ) + '。';
} else if ( state === 'confirm' ) {
stats = uploader.getStats();
if ( stats.uploadFailNum ) {
text = '已成功上传' + stats.successNum+ '张照片至XX相册，'+
stats.uploadFailNum + '张照片上传失败，<a class="retry" href="#">重新上传</a>失败图片或<a class="ignore" href="#">忽略</a>'
}
} else {
stats = uploader.getStats();
text = '共' + fileCount + '张（' +
WebUploader.formatSize( fileSize ) +
'），已上传' + stats.successNum + '张';
if ( stats.uploadFailNum ) {
text += '，失败' + stats.uploadFailNum + '张';
}
}
$info.html( text );
}
function setState( val ) {
var file, stats;
if ( val === state ) {
return;
}
$upload.removeClass( 'state-' + state );
$upload.addClass( 'state-' + val );
state = val;
switch ( state ) {
case 'pedding':
$placeHolder.removeClass( 'element-invisible' );
$queue.parent().removeClass('filled');
$queue.hide();
$statusBar.addClass( 'element-invisible' );
uploader.refresh();
break;
case 'ready':
$placeHolder.addClass( 'element-invisible' );
$( '#filePicker2' ).removeClass( 'element-invisible');
$queue.parent().addClass('filled');
$queue.show();
$statusBar.removeClass('element-invisible');
uploader.refresh();
break;
case 'uploading':
$( '#filePicker2' ).addClass( 'element-invisible' );
$progress.show();
$upload.text( '暂停上传' );
break;
case 'paused':
$progress.show();
$upload.text( '继续上传' );
break;
case 'confirm':
$progress.hide();
$upload.text( '开始上传' ).addClass( 'disabled' );
stats = uploader.getStats();
if ( stats.successNum && !stats.uploadFailNum ) {
setState( 'finish' );
return;
}
break;
case 'finish':
stats = uploader.getStats();
if ( stats.successNum ) {
alert( '文件上传已完成！' );//文件上传后服务器合并文件
} else {
// 没有成功的图片，重设
state = 'done';
location.reload();
}
break;
}
updateStatus();
}
uploader.onUploadProgress = function( file, percentage ) {
var $li = $('#'+file.id),
$percent = $li.find('.progress span');
$percent.css( 'width', percentage * 100 + '%' );
percentages[ file.id ][ 1 ] = percentage;
updateTotalProgress();
};
uploader.onFileQueued = function( file ) {
fileCount++;
fileSize += file.size;
if ( fileCount === 1 ) {
$placeHolder.addClass( 'element-invisible' );
$statusBar.show();
}
addFile( file );
setState( 'ready' );
updateTotalProgress();
};
uploader.onFileDequeued = function( file ) {
fileCount--;
fileSize -= file.size;
if ( !fileCount ) {
setState( 'pedding' );
}
removeFile( file );
updateTotalProgress();
};
uploader.on( 'all', function( type ) {
var stats;
switch( type ) {
case 'uploadFinished':
setState( 'confirm' );
break;
case 'startUpload':
setState( 'uploading' );
break;
case 'stopUpload':
setState( 'paused' );
break;
}
});
uploader.onError = function( code ) {
alert( 'Eroor: ' + code );
};
$upload.on('click', function() {
if ( $(this).hasClass( 'disabled' ) ) {
return false;
}
if ( state === 'ready' ) {
uploader.upload();
} else if ( state === 'paused' ) {
uploader.upload();
} else if ( state === 'uploading' ) {
uploader.stop();
}
});
$info.on( 'click', '.retry', function() {
uploader.retry();
} );
$info.on( 'click', '.ignore', function() {
alert( 'todo' );
} );
$upload.addClass( 'state-' + state );
updateTotalProgress();
});
后台Controller层代码：
package com.webFileUploader.Controller;
import java.util.Map;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;
import com.webFileUploader.exception.ErrorPremetersException;
import com.webFileUploader.service.FileManagerService;
import com.webFileUploader.utils.MutilFileUploadUtils;
import com.webFileUploader.vo.MutilFileInfo;
/**
* @version 1.0
* @author liangxh
* @since 2018-12-04
* @return 文件上传
*/
@Controller
public class uploadController {
@Autowired
private FileManagerService fileManagerService;
/**
* 文件上传
* @param fileInfo:文件参数实体类
* @param file 附件字节码文件
* @return 返回处理结果，请求头200:成功,500:失败
* @throws Exception
*/
@RequestMapping(value = "/uploadFile", method = RequestMethod.POST)
@ResponseBody
public Map<String, String> MutiluploadFile(MutilFileInfo fileinfo,@RequestParam(required=false,value="file")MultipartFile file,HttpServletResponse response) throws Exception {
try {
if(file != null && !file.isEmpty()){
if(MutilFileUploadUtils.checkMutiFilePremeter(fileinfo)){ //切片上传
fileManagerService.saveMutiBurstFiletoDir(fileinfo,file);
}else if(MutilFileUploadUtils.checkSingleFilePremeter(fileinfo)){//单文件整体上传
fileManagerService.saveSingleFiletoDir(fileinfo,file);
}else {
throw new ErrorPremetersException("文件上传参数不合法");
}
}else {
throw new ErrorPremetersException("文件上传附件字节流内容为空");
}
} catch (Exception e) {
e.printStackTrace();
response.setStatus(500);
}
return null;
}
/**
* 文件分片合并
* @return 返回处理结果，请求头200:成功,500:失败
* @throws Exception
*/
@RequestMapping(value = "/mergingChunks", method = RequestMethod.POST)
@ResponseBody
public Map<String, String> MutilMergingChunksForFile(MutilFileInfo fileinfo,HttpServletResponse response) throws Exception {
try {
fileManagerService.MutilMergingChunks(fileinfo);
} catch (Exception e) {
e.printStackTrace();
response.setStatus(500);
}
return null;
}
/**
* 文件分片合并
* @return 返回处理结果，请求头200:成功,500:失败
* @throws Exception
*/
@RequestMapping(value = "/")
public String uploaderView(HttpServletRequest request) throws Exception {
HttpSession session = request.getSession();
System.out.println(session);
return "redirect:/index.html";
}
}
后台Service实现层；先在服务端硬盘上创建一个要上传的文件相同的大文件，利用RandomAccessFile实现文件的随机读写。从而实现在分片上传时直接覆盖空白文件中的一小段数据，从而避免分片保存为临时文件再合并的IO消耗，
package com.webFileUploader.service.impl;
import java.io.File;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.locks.ReentrantLock;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;
import com.webFileUploader.service.FileManagerService;
import com.webFileUploader.utils.MutilFileUploadUtils;
import com.webFileUploader.utils.SHA256Util;
import com.webFileUploader.utils.SessionUtils;
import com.webFileUploader.vo.MutilFileInfo;
@Service
public class FileManagerServiceImpl implements FileManagerService {
@Value("${filePath.tempWorkBasePath}")
private String tempWorkPath;//分片临时文件存放目录
@Value("${filePath.saveFileBasePath}")
private String saveFilePath;//文件存放目录
private ReentrantLock filetempLock = new ReentrantLock();
@Override
public void saveMutiBurstFiletoDir(MutilFileInfo fileinfo, MultipartFile file) throws Exception {
this.checkBaseDir(tempWorkPath);
File tempFile = this.GenerateDirPathForCurrFile(fileinfo,"chunks");
MutilFileUploadUtils.spaceFileWriter(file,tempFile,fileinfo);
}
@Override
public void saveSingleFiletoDir(MutilFileInfo fileinfo, MultipartFile file) throws Exception {
this.checkBaseDir(saveFilePath);
File targetFile = this.GenerateDirPathForCurrFile(fileinfo,"single");
MutilFileUploadUtils.saveFile2DirPath(file,targetFile);
}
@Override
synchronized public File GenerateDirPathForCurrFile(MutilFileInfo fileinfo,String flag) throws Exception {
String fileName = fileinfo.getName();
String lastModifiedDate = fileinfo.getLastModifiedDate();
long fileSize = fileinfo.getSize();
String type = fileinfo.getType();
String id = fileinfo.getId();
String extName = fileName.substring(fileName.lastIndexOf("."));
long timeStemp=System.currentTimeMillis();
if("single".equals(flag)) {
String fileNameSource = fileName+lastModifiedDate+fileSize+type+id+timeStemp;
String fileDirName = SHA256Util.getSHA256StrJava(fileNameSource)+extName;
File targetFile = new File(saveFilePath,fileDirName);
while(targetFile.exists()){
fileNameSource=fileNameSource+"1";
fileDirName = SHA256Util.getSHA256StrJava(fileNameSource)+extName;
targetFile = new File(fileDirName);
}
return targetFile;
}else if("chunks".equals(flag)) {
String fileNameSource = fileSize+"_"+fileName+id+lastModifiedDate;
String fileDirName = tempWorkPath+"/"+SHA256Util.getSHA256StrJava(fileNameSource)+extName+".temp";
File tempFile = new File(fileDirName);//禁用FileInfo.exists()类, 防止缓存导致并发问题
if(!(tempFile.exists()&&tempFile.isFile())){
filetempLock.lock();//上锁
if(!(tempFile.exists()&&tempFile.isFile())) {
MutilFileUploadUtils.readySpaceFile(fileinfo,tempFile);
}
filetempLock.unlock();//释放锁
}
tempFile = new File(fileDirName);
return tempFile;
}else{
throw new Exception("目标文件生成失败");
}
}
public void checkBaseDir(String baseDir) throws Exception {
File file = new File(baseDir);
if(!file.exists()&&!file.isDirectory()) {
file.mkdirs();
}
}
@Override//文件合并
public void MutilMergingChunks(MutilFileInfo fileinfo) throws Exception {
// TODO Auto-generated method stub
String fileName = fileinfo.getName();
String lastModifiedDate = fileinfo.getLastModifiedDate();
long fileSize = fileinfo.getSize();
String id = fileinfo.getId();
String extName = fileName.substring(fileName.lastIndexOf("."));
String fileNameSource = fileSize+"_"+fileName+id+lastModifiedDate;
String fileDirName = tempWorkPath+"/"+SHA256Util.getSHA256StrJava(fileNameSource)+extName+".temp";
File tempFile = new File(fileDirName);
if(tempFile.exists()&&tempFile.isFile()) {
checkBaseDir(saveFilePath);
String targetDirName = saveFilePath+"/"+SHA256Util.getSHA256StrJava(fileNameSource);
File targetFile=new File(targetDirName+extName);
while(targetFile.exists()&&targetFile.isFile()) {
targetDirName = targetDirName+"1";
targetFile=new File(targetDirName+extName);
}
System.out.println(targetFile.getAbsolutePath());
if(tempFile.renameTo(targetFile)) {
System.out.println("文件重命名成功!");
//数据库操作
//数据库操作
}else {
System.out.println("文件重命名失败!");
throw new Exception("临时文件重命名失败");
}
}
}
}
实体类，为了便与操作，这里将所有的参数分装成了一个实体类；
package com.webFileUploader.vo;
import java.io.File;
import java.util.Arrays;
/**
* @version 1.0
* @author liangxh
* @since 2018-12-04
* @return 大文件上传实体类
*/
public class MutilFileInfo {
private String id; //文件id
private String name; //文件名称
private String type;//文件类型
private String lastModifiedDate;//文件最后一次修改时间
private Long size;//文件总大小
//private Byte[] file;//副本字节流文件
private Integer chunk;//当前分片序号
private Integer chunks;//分片总数
private File fileChunk;//文件临时分片
private Boolean saved=false;//分片是否保存成功 默认值:false
public Boolean getSaved() {
return saved;
}
public void setSaved(Boolean saved) {
this.saved = saved;
}
public String getId() {
return id;
}
public File getFileChunk() {
return fileChunk;
}
public void setFileChunk(File fileChunk) {
this.fileChunk = fileChunk;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getType() {
return type;
}
public void setType(String type) {
this.type = type;
}
public String getLastModifiedDate() {
return lastModifiedDate;
}
public void setLastModifiedDate(String lastModifiedDate) {
this.lastModifiedDate = lastModifiedDate;
}
public Long getSize() {
return size;
}
public void setSize(Long size) {
this.size = size;
}
public Integer getChunk() {
return chunk;
}
public void setChunk(Integer chunk) {
this.chunk = chunk;
}
public Integer getChunks() {
return chunks;
}
public void setChunks(Integer chunks) {
this.chunks = chunks;
}
@Override
public String toString() {
return "MutilFileInfo [id=" + id + ", name=" + name + ", type=" + type + ", lastModifiedDate="
+ lastModifiedDate + ", size=" + size + ", chunk=" + chunk + ", chunks=" + chunks + ", fileChunk="
+ fileChunk + ", saved=" + saved + "]";
}
}
文件上传工具类封装;
package com.webFileUploader.utils;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileFilter;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.RandomAccessFile;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
import java.util.concurrent.ConcurrentHashMap;
import org.springframework.web.multipart.MultipartFile;
import com.webFileUploader.vo.MutilFileInfo;
/**
* @version 1.0
* @author liangxh
* @since 2018-12-04
* @return 文件上传工具类
*/
public class MutilFileUploadUtils {
/**
* 校验文件切片上传参数(字节流文件不能为空)
* @param fileinfo:上传参数实体类
* @return 判断是否文件切片上传，true：切片上传，false:单文件整体上传
* @throws Exception
*/
public static Boolean checkMutiFilePremeter(MutilFileInfo fileinfo) {
if(fileinfo!=null) {
if(fileinfo.getChunks()!=null&&fileinfo.getChunk()!=null&&fileinfo.getChunks()>1&&fileinfo.getChunk()>=0&&fileinfo.getChunks()>fileinfo.getChunk()) {
return true;
}else {
return false;
}
}else {
return false;
}
}
/**
* 校验文件单文件上传参数(字节流文件不能为空)
* @param fileinfo:上传参数实体类
* @return 判断参数上传是否合法，true：符合单文件上传参数格式，false:不符合单文件格式
* @throws Exception
*/
public static Boolean checkSingleFilePremeter(MutilFileInfo fileinfo) {
if(fileinfo!=null) {
if(fileinfo.getChunks()==null&&fileinfo.getChunk()==null) {
return true;
}else {
return false;
}
}else {
return false;
}
}
/**
* 保存文件到指定目录
* @param fileinfo:上传参数实体类
* @throws Exception
*/
public static void saveFile2DirPath(MultipartFile file,File targetFile) throws Exception {
if(targetFile.createNewFile()){
file.transferTo(targetFile);
}
}
/**
* 创建空目标文件
* @throws IOException
* @throws Exception
*/
public static void readySpaceFile(MutilFileInfo fileinfo,File tempFile) throws IOException{
RandomAccessFile targetSpaceFile = new RandomAccessFile(tempFile, "rws");
targetSpaceFile.setLength(fileinfo.getSize());
System.out.println("创建文件："+fileinfo.getSize());
targetSpaceFile.close();
}
/**
* 向空文件写入二进制数据
* @param targetFile:目标文件
* @param appenderFile:数据源文件
* @throws Exception
*/
@SuppressWarnings("resource")
public static void spaceFileWriter(MultipartFile file, File tempFile,MutilFileInfo fileInfo) throws Exception {
long totalSpace = tempFile.getTotalSpace();
RandomAccessFile raf = new RandomAccessFile(tempFile, "rw");
BufferedInputStream sourceBuffer = new BufferedInputStream(file.getInputStream());
Long startPointer = getFileWriterStartPointer(file, fileInfo);
raf.seek(startPointer);//初始化文件指针起始位置
byte[] bt = new byte[1024];
int n=0;
try {
while ((n=sourceBuffer.read(bt))!=-1){
raf.write(bt);
}
} catch (IOException e) {
e.printStackTrace();
}finally {
if(sourceBuffer!=null) {
sourceBuffer.close();
}
if(raf!=null) {
raf.close();
}
}
}
/**
* 计算指针开始位置
* @param fileInfo:分片实体类
* @param MultipartFile:文件流
* @throws IOException
* @throws Exception
*/
synchronized public static Long getFileWriterStartPointer(MultipartFile file, MutilFileInfo fileInfo) throws Exception {
// TODO Auto-generated method stub
long chunkSize = file.getSize();
Integer currChunk = fileInfo.getChunk();
Integer allChunks = fileInfo.getChunks();
Long allSize = fileInfo.getSize();
if(currChunk<(allChunks-1)){
long starter = chunkSize*currChunk;
return starter;
}else if(currChunk==(allChunks-1)){
long starter = allSize-chunkSize;
return starter;
}else {
throw new Exception("分片参数异常");
}
}
}
DEMO下载地址：https://dwz.cn/fgXtRtnu