首先按我自己理解的意思介绍下为什么要使用(oss);oss是阿里云推出的图片存储服务,既然有了这个服务,我们在项目开发过程中,
用到的图片上传,就可以直接放到阿里云的oss中,这样不仅可以节省我们项目本身的使用空间,同时当项目中的图片进行迁移的时候,也不会导致图片丢失的情况;
1.http://www.aliyun.com/product/登录阿里云,开通oss图片存储(如果你还没有账号需要先注册获取Access Key ID和Access Key Secret)
2.新建bucket(注意命名空间,最好设置公共读写),我这边是以(杭州节点为例)
3.应用到项目中(http://docs.aliyun.com/#/pub/oss/sdk/java-sdk&preface)下载sdk(导入步骤省略)
4.参照demo写的简单的上传和下载到oss的代码
上传:
public void uploadFileToOss(String key, String filename){
File file = new File(filename);
ObjectMetadata objectMeta = new ObjectMetadata();
objectMeta.setContentLength(file.length());
objectMeta.setContentType("image/jpeg");
InputStream input;
try {
input = new FileInputStream(file);
OSSClient client = initParam.getOssClient();
client.putObject(initParam.getBucketName(), key, input, objectMeta);
} catch (FileNotFoundException e) {
logger.error("找不到文件:"+filename);
e.printStackTrace();
}catch(OSSException oe){
logger.error("OSSException");
oe.printStackTrace();
}catch(ClientException ce){
logger.error("ClientException");
ce.printStackTrace();
}
}
下载:
public void downFileFromOss(String key, String filename,
HttpServletRequest request,HttpServletResponse response){
OutputStream outStream=null;
try{
outStream=response.getOutputStream();
ServletUtils.setFileDownloadHeader(request, response, filename);
OSSClient client = initParam.getOssClient();
GetObjectRequest getObjectRequest = new GetObjectRequest(initParam.getBucketName(), key);
OSSObject ossObject = client.getObject(getObjectRequest);
byte[] buffer = new byte[1024];
int bytesRead=0;
outStream = response.getOutputStream();
while ((bytesRead = ossObject.getObjectContent().read(buffer)) > -1) {
outStream.write(buffer, 0, bytesRead);
}
outStream.flush();
} catch (UnsupportedEncodingException e) {
logger.error("下载文件失败",e);
} catch (IOException e) {
logger.error("下载文件失败",e);
}finally{
if(outStream != null){
try {
outStream.close();
} catch (IOException e) {
logger.error("关闭输入流失败",e);
}
}
}
}