java实现文件切片上传百度云+断点续传的方法
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2022-03-07 08:45:41
前言:本文代码通过dubbo进行远程调用的接口,如果不使用dubbo,直接将service放到你的service,并稍作修改,redis替换成自己封装的工具即可。下方代码有点多,但基本上都加注释了。切...
前言:
本文代码通过dubbo进行远程调用的接口,如果不使用dubbo,直接将service放到你的service,并稍作修改,redis替换成自己封装的工具即可。下方代码有点多,但基本上都加注释了。
切片上传百度云和上传到本地有所不同,上传到本地是需要前端给个唯一标识,通过自定义唯一标识保存到本地,最后在合并文件。而上传百度云则需要直接把切片传到百度云,唯一标识uploadid是百度云提供的,上传及合并都是直接调用百度云提供的接口。下方为百度云的使用文档。
对象存储bos - 文件管理 | 百度智能云文档 (baidu.com)
1.定义一个实体类
用于接收前台传过来的信息,信息应该包括总切片数,当前切片数,文件名称,文件总大小。
import com.geely.tcm.common.annotation.excel; import lombok.data; import javax.validation.constraints.max; import javax.validation.constraints.min; import javax.validation.constraints.notnull; import java.io.serializable; @data public class mutilfileinfo implements serializable { private static final long serialversionuid = 1l; @notnull(message = "车型不能为空") @excel(name = "车型") private string model; @excel(name = "文件名称") private string name; @excel(name = "文件总大小") private long totalsize; @min(value = 1, message = "不能小于1") @max(value = 10000, message = "不能大于10000") @excel(name = "当前分片序号") private integer chunk; @min(value = 1, message = "不能小于1") @max(value = 10000, message = "不能大于10000") @excel(name = "分片总数") private integer chunks; }
2.创建controller
用于处理前端过来的文件及信息
import com.alibaba.fastjson.json; import com.baidubce.services.bos.model.partetag; import com.geely.tcm.common.annotation.log; import com.geely.tcm.common.bean.mutilfileinfo; import com.geely.tcm.common.bean.baidu.custompartetag; import com.geely.tcm.common.bean.measure.cmm3dmodel; import com.geely.tcm.common.configuration.redisutils; import com.geely.tcm.common.enums.businesstype; import com.geely.tcm.common.util.stringutils; import com.geely.tcom.remote.api.baidu.baiducloudbosservice; import io.swagger.annotations.api; import io.swagger.annotations.apiimplicitparam; import io.swagger.annotations.apiimplicitparams; import io.swagger.annotations.apioperation; import lombok.extern.slf4j.slf4j; import org.apache.dubbo.config.annotation.dubboreference; import org.springframework.web.bind.annotation.postmapping; import org.springframework.web.bind.annotation.requestmapping; import org.springframework.web.bind.annotation.requestparam; import org.springframework.web.bind.annotation.restcontroller; import org.springframework.web.multipart.multipartfile; import java.util.*; import java.util.concurrent.semaphore; import java.util.stream.collectors; @api(tags = "文件上传下载服务") @requestmapping("/threemodel") @restcontroller @slf4j public class model3dcontroller1 { //dubboreference这个是远程调用,如果没有远程调用,直接autowired就可以 @dubboreference(version = "${sheet.service.version}") private baiducloudbosservice baiducloudbosservice; //通过加锁保证线程安全 private semaphore lock = new semaphore(1); //api开头的这些是swagger用到的,如果没使用swagger可以删到postmapping上边 @apioperation(value = "obj模型上传") @apiimplicitparams({ @apiimplicitparam(name = "totalsize", value = "文件总大小",datatypeclass = long.class), @apiimplicitparam(name = "chunks", value = "总切片数",datatypeclass = integer.class), @apiimplicitparam(name = "chunk", value = "当前切片数",datatypeclass = integer.class), @apiimplicitparam(name = "model", value = "车型",datatypeclass = string.class), @apiimplicitparam(name = "file", value = "切片文件",datatypeclass = multipartfile.class) }) @log(title = "obj模型上传", businesstype = businesstype.insert) @postmapping("/upload3dtobos") public object upload3dtobos( mutilfileinfo fileinfo, @requestparam(required=false,value="file") multipartfile multipartfile) { string model=fileinfo.getmodel().trim(); map<string,object> m=new hashmap(); string filename=fileinfo.getname(); if (stringutils.isempty(filename)) {//判断文件名称是否为空 m.put("key","error"); m.put("value","文件名不能为空"); return m; } if (multipartfile == null) {//判断上传过来的切片是否为空 m.put("key","error"); m.put("value","请上传文件"); return m; } try{ string filepath="/test/"+model+"/"+filename;//拼接百度云地址 string rediskey="partetags-"+model+"-"+filename;//缓存的键 integer current =fileinfo.getchunk();//当前切片数 integer total = fileinfo.getchunks();//总切片数 long size=multipartfile.getsize();//文件大小 string uploadid = getuploadid(rediskey, filepath);//该方法获取百度云的唯一标识uploadid byte[] file = multipartfile.getbytes();//将切片过来的文件转成字节数组 if(current==1){//这块进行断点续传,如果是第一个切片,查询一下缓存中是否有数据了,如果有返回给前台,如果没有进行上传 if(getcurrentequalsone(rediskey).size()>0) { //给前台提供是否缓存中已有数据 return getcurrentequalsone(rediskey); } } //切片上传百度云 list<custompartetag> custompartetags = getpartetags(rediskey, uploadid, filepath, file, size, current); //如果缓存中成功的切片数等于总数,那么进行合并 if (custompartetags.size() == total) { custompartetags = custompartetags.stream().sorted(comparator.comparing(partetag::getpartnumber)).collect(collectors.tolist());//进行排序 baiducloudbosservice.completepart(uploadid, custompartetags, filepath);//执行合并 redisutils.hdel(rediskey,"uploadid","custompartetags");//如果合并成功,删除缓存中的数据 // 入库做记录 m.put("key","success"); m.put("value","上传成功"); return m; } m.put("key","continue"); m.put("value",current+1); return m; }catch (exception e){ e.printstacktrace(); m.put("key","error"); m.put("value","上传失败"); return m; } } /** * 获取 part * * @param redispartkey rediskey * @return */ private list<custompartetag> getpartetags(string redispartkey, string uploadid, string filepath, byte[] file, long size, int current) { list<custompartetag> custompartetags = null; try { lock.acquire(); //因为每次上传成功后都会把成功的切片存进百度云,如注解下方第四行代码,所以每次上传之前需要先取出来,将成功的切片放进去 custompartetags = redisutils.hget(redispartkey, "custompartetags") == null ? new arraylist<>() : json.parsearray((string) redisutils.hget(redispartkey, "custompartetags"), custompartetag.class); //上传百度云成功之后会返回一个partetagg对象,由于项目中存在dubbo,顾将custompartetag类继承partetagg进行序列化 custompartetag custompartetag = baiducloudbosservice.uploadcustompartetag(uploadid, filepath, file, size, current); custompartetags.add(custompartetag); setpartetagstoredis(redispartkey, custompartetags); } catch (interruptedexception e) { e.printstacktrace(); } finally { lock.release(); } return custompartetags; } /** * 获取 uploadid * * @param redispartkey rediskey * @param filepath filepath * @return */ private string getuploadid(string redispartkey, string filepath) { string uploadid = null; try { lock.acquire();//线程锁 uploadid = (string) redisutils.hget(redispartkey, "uploadid");//先去redis中找,是否已经有uploadid if (stringutils.isempty(uploadid)) {//判断是否为空,如果为空,说明之前没上传过,为首次上传,如果已经存在,返回该uploadid uploadid = baiducloudbosservice.initmultipartupload(filepath);//进行初始化,返回一个唯一标识uploadid redisutils.hset(redispartkey, "uploadid", uploadid, 60 * 60);//将返回来的uploadid放到缓存中,下个切片上传直接使用这个uploadid } } catch (interruptedexception e) { e.printstacktrace(); } finally { lock.release(); } return uploadid; } /** * 薄墩 partkey到redis * * @param redispartkey * @param custompartetags */ private void setpartetagstoredis(string redispartkey, list<custompartetag> custompartetags) { redisutils.hset(redispartkey, "custompartetags", json.tojsonstring(custompartetags), 60 * 60); } public map<string,object> getcurrentequalsone(string rediskey){ map<string,object> m=new hashmap<>(); list<custompartetag> custompartetags = redisutils.hget(rediskey, "custompartetags") == null ? new arraylist<>() : json.parsearray((string) redisutils.hget(rediskey, "custompartetags"), custompartetag.class); //给前台提供是否缓存中已有数据 if(custompartetags.size()==0){ return m; }else{ //缓存中有数据,返回缓存中数据 int t= custompartetags.get(custompartetags.size()-1).getpartnumber(); m.put("key","hasvalue"); m.put("value",t); return m; } } }
3.远程的service
(如果不用远程调用,直接创建一个service就可以)
package com.geely.tcm.sheet.service; import com.baidubce.services.bos.bosclient; import com.baidubce.services.bos.model.*; import com.geely.tcm.common.bean.baidu.bosresult; import com.geely.tcm.common.bean.baidu.custompartetag; import com.geely.tcm.common.util.stringutils; import com.geely.tcom.remote.api.baidu.baiducloudbosservice; import lombok.extern.slf4j.slf4j; import org.apache.dubbo.config.annotation.dubboservice; import org.springframework.beans.factory.annotation.autowired; import java.io.*; import java.net.url; import java.util.arraylist; import java.util.list; /** * 百度私有云服务操作 * * @author : wangbin * @date : 2021/9/24 * @since : 1.0.0 */ @slf4j @dubboservice(version = "${sheet.service.version}") public class baiducloudbosserviceimpl{ @autowired private bosclient bosclient; public string initmultipartupload(string filepath) { // 开始multipart upload initiatemultipartuploadrequest initiatemultipartuploadrequest = new initiatemultipartuploadrequest(null, filepath); initiatemultipartuploadresponse initiatemultipartuploadresponse = bosclient.initiatemultipartupload(initiatemultipartuploadrequest); // 打印uploadid,它是区分分块上传事件的唯一标识 string uploadid = initiatemultipartuploadresponse.getuploadid(); log.info("filepath= {},uploadid = {}", filepath, uploadid); return uploadid; } public custompartetag uploadcustompartetag(string uploadid, string filepath, byte[] file, long partsize, int partnumber) { uploadpartrequest uploadpartrequest = new uploadpartrequest(); uploadpartrequest.setbucketname(null); uploadpartrequest.setkey(filepath); uploadpartrequest.setuploadid(uploadid); inputstream input= new bytearrayinputstream(file); uploadpartrequest.setinputstream(input); uploadpartrequest.setpartsize(partsize); uploadpartrequest.setpartnumber(partnumber ); uploadpartrequest.setmd5digest(""); uploadpartresponse uploadpartresponse = bosclient.uploadpart(uploadpartrequest); partetag partetag = uploadpartresponse.getpartetag(); custompartetag custompartetag = new custompartetag(); custompartetag.setetag(partetag.getetag()); custompartetag.setpartnumber(partetag.getpartnumber()); return custompartetag; } /** * 分块上传结束之后,当所有的数据part验证通过后,bos将把这些数据part组合成一个完整的object * * @param uploadid * @param custompartetags * @param filepath */ public void completepart(string uploadid, list<custompartetag> custompartetags, string filepath) { //for循环转一下 custompartetag 转partetag if(custompartetags.size()>0){ list<partetag> partetags=new arraylist<>(); for(custompartetag c:custompartetags){ partetag partetag=new partetag(); partetag.setetag(c.getetag()); partetag.setpartnumber(c.getpartnumber()); partetags.add(partetag); } completemultipartuploadrequest completemultipartuploadrequest = new completemultipartuploadrequest(null, filepath, uploadid, partetags); completemultipartuploadresponse completemultipartuploadresponse = bosclient.completemultipartupload(completemultipartuploadrequest); log.info("完成分片上传 , filepath = {},uploadid = {}, etag = {}", filepath, uploadid,completemultipartuploadresponse.getetag()); } } }
4.定义一个实体类
继承,实现序列化,(dubbo不序列化就会传不过去)
import com.baidubce.services.bos.model.partetag; import java.io.serializable; public class custompartetag extends partetag implements serializable { }
5.这里提供一个临时测试的前端代码
<html lang="en"> <head> <meta charset="utf-8"> <title>upload</title> <script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.min.js"></script> </head> <body> <input type="file" name="file" id="file"> <button id="upload" onclick="upload()">upload</button> <script type="text/javascript"> var bytesperpiece = 1024 * 1024; // 每个文件切片大小定为1mb . var totalpieces; function upload() { var blob = document.getelementbyid("file").files[0]; var start = 0; var end; var index = 1; var filesize = blob.size; var filename = blob.name; //计算文件切片总数 totalpieces = math.ceil(filesize / bytesperpiece); while(start < filesize) { end = start + bytesperpiece; if(end > filesize) { end = filesize; } var chunk = blob.slice(start,end);//切割文件 var sliceindex= blob.name + index; var formdata = new formdata(); formdata.append("file", chunk, filename); formdata.append("totalsize",filesize); formdata.append("chunks",totalpieces); formdata.append("chunk",index); formdata.append("model",'kx11'); $.ajax({ //路径换成你的路径 url: 'http://127.0.0.1:6300/threemodel/upload3dtobos', type: 'post', datatype:'json', cache: false, data: formdata, processdata: false, contenttype: false, mimetype: "multipart/form-data", success: function (result){ console.log(result.value); } }); start = end; index++; } } </script> </body> </html>
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