阿里云oss文件的上传和下载

一:文件上传

首先创建本地数据库存储Ossfile ossfile = new Ossfile();

// 获取单个文件

MultipartFile mf = entity.getValue();

// 获得原始文件名

fileName = mf.getOriginalFilename();

String[] split = fileName.split(".");

String type = fileName.substring(fileName.lastIndexOf(".") + 1);

byte[] bytes = mf.getBytes();

//上传文件至oss

String osskey = StringUtil.getUUID();

String objectName = SysConstant.OSS_FILE_UPLOAD_PATH + "/" + SysConstant.FY_FILE_UPLOAD_PATH + "/" + osskey;//创建文件的路径和名称

OSS ossClient = null;

try {

// 创建OSSClient实例。

ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);

三个参数为阿里云密钥

// 上传文件。

ossClient.putObject(bucketName, objectName, new ByteArrayInputStream(bytes));

//bucketName为oss桶的名称

//objectName为文件的路径和名称

return true;

} catch (Exception e) {

StringWriter writer = new StringWriter();

e.printStackTrace(new PrintWriter(writer, true));

StringBuffer logStr = new StringBuffer("\r\n\t").append("上传文件失败");

logStr.append("\r\n\t").append("key:").append(key);

logStr.append("\r\n\t").append("执行错误结果如下:");

logStr.append("\r\n\t").append(writer.toString());

LogEntity logEntity = new LogEntity("putObject", "com.datanew.util.AliyunOssHelper2", logStr.toString(), "error");

logEntity.putParams("key", key).putParams("bytes.length", bytes.length);

logEntity.setExtendMap(true);

LogUtil.saveLog(logEntity);

return false;

} finally {

if (ossClient != null) {

ossClient.shutdown();

}

}

ossfile.setFiletype(type);

ossfile.setFilesize("" + mf.getSize());

ossfile.setFilename(fileName);

ossfile.setOsskey(osskey);

ossfile.setCreatedate(date);

保存ossfile,ossfile为数据库保存上传文件的路径名称大小等

二:文件下载

String osskey = (String) fileMap.get("osskey");

String name = SysConstant.OSS_FILE_UPLOAD_PATH + "/" + SysConstant.FY_FILE_UPLOAD_PATH + "/" + osskey

得到文件的名称

下载文件的方法实体,得到一个字节流

{

OSS ossClient = null;

InputStream inputStream = null;

ByteArrayOutputStream outputStream = new ByteArrayOutputStream();

try {

// 创建OSSClient实例。

ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);

//三个参数为阿里云密钥

// Object是否存在

if (!ossClient.doesObjectExist(bucketName, name)) {

return null;

}

//bucketName为桶的名称

//name为文件的名称和路径

// 获取Object

OSSObject ossObject = ossClient.getObject(bucketName, key);

inputStream = ossObject.getObjectContent();

int ch;

while ((ch = inputStream.read()) != -1) {

outputStream.write(ch);

}

return outputStream;

} catch (Exception e) {

StringWriter writer = new StringWriter();

e.printStackTrace(new PrintWriter(writer, true));

StringBuffer logStr = new StringBuffer("\r\n\t").append("下载文件失败");

logStr.append("\r\n\t").append("key:").append(key);

logStr.append("\r\n\t").append("执行错误结果如下:");

logStr.append("\r\n\t").append(writer.toString());

LogEntity logEntity = new LogEntity("getFile", "com.datanew.util.AliyunOssHelper2", logStr.toString(), "error");

logEntity.putParams("key", key);

logEntity.setExtendMap(true);

LogUtil.saveLog(logEntity);

return null;

} finally {

if (inputStream != null) {

try {

inputStream.close();

} catch (IOException e) {

e.printStackTrace();

}

}

if (ossClient != null) {

ossClient.shutdown();

}

}

}--------下载方法结束

ByteArrayOutputStream baos = (ByteArrayOutputStream) AliyunOssHelper2.getFile(SysConstant.OSS_FILE_UPLOAD_PATH + "/" + SysConstant.FY_FILE_UPLOAD_PATH + "/" + osskey);

得到文件内容

返回前端

if (baos == null) {

throw new BusinessException("文件不存在");

}

byte[] content = baos.toByteArray();

String fileName = (String) fileMap.get("filename");

response.reset();

response.setContentType("application/octet-stream");

response.setHeader("Content-Disposition", (new StringBuilder("attachment; filename=\""))

.append(new String(fileName.getBytes("utf-8"),"ISO-8859-1")).append("\"").toString());

OutputStream os = response.getOutputStream();

os.write(content);

os.flush();

os.close();

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