Java-SDK之如何实现图片处理(二)？

授权访问


对私有权限的文件（Object），如下表所示的权限，必须通过授权才能访问图片服务。

1.     String endpoint = "<endpoint, 例如http://oss-cn-hangzhou.aliyuncs.com>";
2.     String accessKeyId = "<accessKeyId>";
3.     String accessKeySecret = "<accessKeySecret>";
4.     String bucketName = "<bucketName>";
5.     private static String key = "example.jpg";
7.     OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
9.     // 图片处理样式
10.     String style = "image/resize,m_fixed,w_100,h_100/rotate,90";
11.     // 过期时间10分钟
12.     Date expiration = new Date(new Date().getTime() + 1000 * 60 * 10 );
14.     GeneratePresignedUrlRequest req = new GeneratePresignedUrlRequest(bucketName, key, HttpMethod.GET);
15.     req.setExpiration(expiration);
16.     req.setProcess(style);
18.     URL signedUrl = ossClient.generatePresignedUrl(req);
19.     System.out.println(signedUrl);

提示：

• 授权访问支持 自定义样式、 HTTPS、 级联处理
• 指定过期时间请使用 Date expiration = DateUtil.parseRfc822Date("Wed, 21 Dec 2022 14:20:00 GMT");

提示：

• 图片处理的完整代码请参考：GitHub
• SDK处理图片文件支持 自定义样式、 HTTPS、 级联处理

1.     String endpoint = "<endpoint, 例如http://oss-cn-hangzhou.aliyuncs.com>";
2.     String accessKeyId = "<accessKeyId>";
3.     String accessKeySecret = "<accessKeySecret>";
4.     String bucketName = "<bucketName>";
5.     String key = "example.jpg";
7.     OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
9.     // 缩放
10.     String style = "image/resize,m_fixed,w_100,h_100";  
11.     GetObjectRequest request = new GetObjectRequest(bucketName, key);
12.     request.setProcess(style);
14.     ossClient.getObject(request, new File("example-resize.jpg"));
16.     // 裁剪
17.     style = "image/crop,w_100,h_100,x_100,y_100,r_1";
18.     request = new GetObjectRequest(bucketName, key);
19.     request.setProcess(style);
21.     ossClient.getObject(request, new File("example-crop.jpg"));
23.     // 旋转
24.     style = "image/rotate,90";
25.     request = new GetObjectRequest(bucketName, key);
26.     request.setProcess(style);
28.     ossClient.getObject(request, new File("example-rotate.jpg"));
30.     // 锐化
31.     style = "image/sharpen,100";
32.     request = new GetObjectRequest(bucketName, key);
33.     request.setProcess(style);
35.     ossClient.getObject(request, new File("example-sharpen.jpg"));
37.     // 水印
38.     style = "image/watermark,text_SGVsbG8g5Zu-54mH5pyN5YqhIQ";
39.     request = new GetObjectRequest(bucketName, key);
40.     request.setProcess(style);
42.     ossClient.getObject(request, new File("example-watermark.jpg"));
44.     // 格式转换
45.     style = "image/format,png";
46.     request = new GetObjectRequest(bucketName, key);
47.     request.setProcess(style);
49.     ossClient.getObject(request, new File("example-format.png"));
51.     // 图片信息
52.     style = "image/info";
53.     request = new GetObjectRequest(bucketName, key);
54.     request.setProcess(style);
56.     ossClient.getObject(request, new File("example-info.txt"));
58.     ossClient.shutdown();

1.     String endpoint = "<endpoint, 例如http://oss-cn-hangzhou.aliyuncs.com>";
2.     String accessKeyId = "<accessKeyId>";
3.     String accessKeySecret = "<accessKeySecret>";
4.     String bucketName = "<bucketName>";
5.     String key = "example.jpg";
7.     OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
9.     // 自定义样式
10.     String style = "style/oss-pic-style-w-100";  
11.     GetObjectRequest request = new GetObjectRequest(bucketName, key);
12.     request.setProcess(style);
14.     ossClient.getObject(request, new File("example-new.jpg"));
16.     ossClient.shutdown();

1.     String endpoint = "<endpoint, 例如http://oss-cn-hangzhou.aliyuncs.com>";
2.     String accessKeyId = "<accessKeyId>";
3.     String accessKeySecret = "<accessKeySecret>";
4.     String bucketName = "<bucketName>";
5.     private static String key = "example.jpg";
7.     OSSClient ossClient = new OSSClient(endpoint, accessKeyId, accessKeySecret);
9.     // 级联处理
10.     String style = "image/resize,m_fixed,w_100,h_100/rotate,90";  
11.     GetObjectRequest request = new GetObjectRequest(bucketName, key);
12.     request.setProcess(style);
14.     ossClient.getObject(request, new File("example-new.jpg"));
16.     ossClient.shutdown();

• 可视化图片处理工具 ImageStyleViever ，可以直观的看到OSS图片处理的结果
• OSS图片处理的功能、使用演示 页面