知识在于点滴积累。
将文件或图片上传至oss的工具类：
package com.xcauto.proxy.external.signature.utils;
import com.aliyun.oss.OSSClient;
import com.aliyun.oss.OSSException;
import com.aliyun.oss.model.OSSObject;
import com.aliyun.oss.model.ObjectMetadata;
import com.aliyun.oss.model.PutObjectResult;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.multipart.MultipartFile;
import java.io.*;
import java.net.URL;
import java.util.Date;
import java.util.Random;
/**
* 阿里云 OSS工具类
*
* @author hellen
* @version 1.0
*/
@Component
public class OSSClientUtil {
//参数在yaml配置
@Value("${oss.aliyun.endpoint}")
private String endpoint;
@Value("${oss.aliyun.accessKeyId}")
private String accessKeyId;
@Value("${oss.aliyun.accessKeySecret}")
private String accessKeySecret;
@Value("${oss.aliyun.bucketName}")
private String bucketName;
// 文件存储目录
private String filedir = "";
/**
* 上传图片
*
* @param url
* @throws Exception
*/
public String uploadImg2Oss(String url) throws Exception {
File fileOnServer = new File(url);
FileInputStream fin;
String serverUrl = null;
try {
fin = new FileInputStream(fileOnServer);
String[] split = url.split("/");
serverUrl = this.uploadFile2OSS(fin, split[split.length - 1]);
} catch (FileNotFoundException e) {
throw new Exception("图片上传失败");
}
return serverUrl;
}
public String uploadImg2Oss(MultipartFile file) throws Exception {
if (file.getSize() > 10 * 1024 * 1024) {
throw new Exception("上传图片大小不能超过10M！");
}
String serverUrl = null;
String originalFilename = file.getOriginalFilename();
String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
Random random = new Random();
String name = random.nextInt(10000) + System.currentTimeMillis() + substring;
try {
InputStream inputStream = file.getInputStream();
serverUrl = this.uploadFile2OSS(inputStream, name);
return serverUrl;
} catch (Exception e) {
e.printStackTrace();
throw new Exception("图片上传失败");
}
}
public String uploadFile2Oss(String filePath) throws Exception {
File file = new File(filePath);
if (file.exists() && file.isFile()) {
String serverUrl = null;
String originalFilename = file.getName();
String substring = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
Random random = new Random();
String name = random.nextInt(10000) + System.currentTimeMillis() + substring;
InputStream inputStream = null;
try {
inputStream = new FileInputStream(file);
serverUrl = this.uploadFile2OSS(inputStream, name);
return serverUrl;
} catch (Exception e) {
e.printStackTrace();
throw new Exception("图片上传失败");
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
} catch (Exception e) {
}
}
}
return null;
}
/**
* 获得图片路径
*
* @param fileUrl
* @return
*/
private String getImgUrl(String fileUrl, OSSClient ossClient) {
System.out.println(fileUrl);
if (!StringUtils.isEmpty(fileUrl)) {
String[] split = fileUrl.split("/");
return this.getUrl(this.filedir + split[split.length - 1], ossClient);
}
return null;
}
/**
* 上传到OSS服务器 如果同名文件会覆盖服务器上的
*
* @param instream
* 文件流
* @param fileName
* 文件名称 包括后缀名
* @return 出错返回"" ,唯一MD5数字签名
*/
public String uploadFile2OSS(InputStream instream, String fileName) {
String url = "";
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
try {
// 创建上传Object的Metadata
ObjectMetadata objectMetadata = new ObjectMetadata();
objectMetadata.setContentLength(instream.available());
objectMetadata.setCacheControl("no-cache");
objectMetadata.setHeader("Pragma", "no-cache");
objectMetadata.setContentType(getcontentType(fileName.substring(fileName.lastIndexOf("."))));
objectMetadata.setContentDisposition("inline;filename=" + fileName);
// 上传文件
PutObjectResult putResult = ossClient.putObject(bucketName, filedir + fileName, instream, objectMetadata);
if (putResult != null) {
url = getUrl(fileName, ossClient);
}
} catch (IOException e) {
} finally {
try {
if (instream != null) {
instream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
ossClient.shutdown();
}
return url;
}
/**
* Description: 判断OSS服务文件上传时文件的contentType
*
* @param
*
* @return String
*/
public static String getcontentType(String filenameExtension) {
if ("bmp".equalsIgnoreCase(filenameExtension)) {
return "image/bmp";
}
if ("gif".equalsIgnoreCase(filenameExtension)) {
return "image/gif";
}
if ("jpeg".equalsIgnoreCase(filenameExtension) || "jpg".equalsIgnoreCase(filenameExtension)
|| "png".equalsIgnoreCase(filenameExtension)) {
return "image/jpeg";
}
if ("html".equalsIgnoreCase(filenameExtension)) {
return "text/html";
}
if ("txt".equalsIgnoreCase(filenameExtension)) {
return "text/plain";
}
if ("vsd".equalsIgnoreCase(filenameExtension)) {
return "application/vnd.visio";
}
if ("pptx".equalsIgnoreCase(filenameExtension) || "ppt".equalsIgnoreCase(filenameExtension)) {
return "application/vnd.ms-powerpoint";
}
if ("docx".equalsIgnoreCase(filenameExtension) || "doc".equalsIgnoreCase(filenameExtension)) {
return "application/msword";
}
if ("xml".equalsIgnoreCase(filenameExtension)) {
return "text/xml";
}
return "image/jpeg";
}
/**
* 获得url链接
*
* @param key
* @return
*/
private String getUrl(String key, OSSClient ossClient) {
boolean flag = false;
if (ossClient == null) {
flag = true;
ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
}
try {
// 设置URL过期时间为1000年 3600l* 1000*24*365*1000
Date expiration = new Date(System.currentTimeMillis() + 3600L * 1000 * 24 * 365 * 1000);
// 生成URL
URL url = ossClient.generatePresignedUrl(bucketName, key, expiration);
if (url != null) {
return url.toString();
}
} catch (Exception e) {
e.printStackTrace();
} finally {
if (true) {
ossClient.shutdown();
}
}
return null;
}
/**
* 删除文件
*/
public void delFileOSS(String fileName){
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
if(fileName != null && fileName.length() > 0) {
ossClient.deleteObject(bucketName, fileName);
}
}
/**
* 文件是否存在
* @param key
* @return
*/
public boolean doesExist(String key){
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
boolean exist = ossClient.doesObjectExist(bucketName, key);
return exist;
}
/**
* 获取文件
* @param key
* @return
* @throws IOException
*/
public byte[] getFile(String key) throws IOException {
OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
OSSObject object = null;
try {
object = ossClient.getObject(bucketName, key);
if (object != null) {
object.close();
}
} catch (OSSException e) {
// OSS在查找不到某对象时，会抛出ErrorCode为“NoSuchKey”的OSSException，而不是返回null
if (e.getErrorCode().contains("NoSuchKey")) {
System.out.println("找不到OSS文件：" + key);
}else {
e.printStackTrace();
}
} catch (IOException e) {
e.printStackTrace();
}
InputStream inputStream = object.getObjectContent();
ByteArrayOutputStream swapStream = new ByteArrayOutputStream();
byte[] buff = new byte[100];
int rc = 0;
while ((rc = inputStream.read(buff, 0, 100)) > 0) {
swapStream.write(buff, 0, rc);
}
byte[] in2b = swapStream.toByteArray();
return in2b;
}
}
OSS的API文档：
http://doc.oss.aliyuncs.com/#_Toc336676734
总结：
redis，fastdfs，oss使用方法：引入jar，util类，存储，可以发现他们使用方式上有共同点，关键是了解他们奇妙的内部机制。
