【java|java实现文件切片上传百度云+断点续传】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 = https://www.it610.com/article/1, message ="不能小于1")
@Max(value = https://www.it610.com/article/10000, message ="不能大于10000")
@Excel(name = "当前分片序号")
private Integer chunk;
@Min(value = https://www.it610.com/article/1, message ="不能小于1")
@Max(value = https://www.it610.com/article/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 = "https://www.it610.com/article/obj模型上传")
@ApiImplicitParams({
@ApiImplicitParam(name = "totalSize", value = "https://www.it610.com/article/文件总大小",dataTypeClass = Long.class),
@ApiImplicitParam(name = "chunks", value = "https://www.it610.com/article/总切片数",dataTypeClass = Integer.class),
@ApiImplicitParam(name = "chunk", value = "https://www.it610.com/article/当前切片数",dataTypeClass = Integer.class),
@ApiImplicitParam(name = "model", value = "https://www.it610.com/article/车型",dataTypeClass = String.class),
@ApiImplicitParam(name = "file", value = "https://www.it610.com/article/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="https://www.it610.com/article/file") MultipartFile multipartFile) {
String model=fileinfo.getModel().trim();
Map 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 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 getPartEtags(String redisPartKey, String uploadId, String filePath,byte[] file, long size, int current) {
List 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 filePathfilePath
* @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 customPartETags) {
RedisUtils.hset(redisPartKey, "customPartETags", JSON.toJSONString(customPartETags), 60 * 60);
}
public Map getCurrentEqualsOne(String redisKey){
Map m=new HashMap<>();
ListcustomPartETags = 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);
returnm;
}
}}
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();
CustomPartETagcustomPartETag = 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 customPartETags, String filePath) {
//for循环转一下 CustomPartETag 转PartETag
if(customPartETags.size()>0){
List 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。
upload
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