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数据处理及使用 ​

生命周期管理 ​

FOS支持用户对Bucket设置生命周期规则，以自动将过期的文件清除，节省存储空间。针对不同前缀的文件，用户可以同时设置多条规则。详细信息请参考生命周期管理

设置生命周期规则 ​

可以通过如下两种方式设置生命周期规则：

java
// 1、以Json格式的字符串
String jsonBucketLifecylce = "{\"rule\":[{\"id\":\"yourBucketName/*-DeleteObject\""+",\"status\":\"enabled\""+",\"resource\":[\"yourBucketName/*\"]"+",\"condition\":{\"time\":{\"dateGreaterThan\":\"2018-09-07T00:00:00Z\"}}"+",\"action\":{\"name\":\"DeleteObject\"}}]}";

SetBucketLifecycleRequest request = new SetBucketLifecycleRequest("yourBucketName",jsonBucketLifecylce);
client.setBucketBucketLifecycle(request);
java
// 2、用户只需指定指定参数即可
List<Rule> rules = new ArrayList<Rule>();
List<String> resource = new ArrayList<String>();
Action action = new Action();
Condition condition = new Condition();

resource.add("yourBucketName/*");
action.setName("DeleteObject");

Time time = new Time();
time.setDateGreaterThan("2018-09-07T00:00:00Z");
condition.setTime(time);

Rule rule = new Rule();
rule.setId("yourBucketName/*-DeleteObject");
rule.setStatus("enabled");
rule.setResource(resource);
rule.setCondition(condition);
rule.setAction(action);

rules.add(rule);

SetBucketLifecycleRequest request = new SetBucketLifecycleRequest();
request.withBucketName("yourBucketName");
request.setRuleList(rules);
client.setBucketBucketLifecycle(request);

查看生命周期规则 ​

可通过如下代码查看Bucket内的生命周期规则：

java
GetBucketLifecycleRequest request = new GetBucketLifecycleRequest("yourBucketName");
GetBucketLifecycleResponse response = client.getBucketLifecycle(request);

删除生命周期规则 ​

可通过如下代码清空生命周期规则：

java
DeleteBucketLifecycleRequest request = new DeleteBucketLifecycleRequest("yourBucketName");
client.deleteBucketLifecycle(request);

跨域资源共享 ​

跨域资源共享（Cross-Origin Resource Sharing），简称CORS，是HTML5提供的标准跨域解决方案，FOS目前已经支持CORS标准来实现跨域访问。

设定CORS规则 ​

可以通过如下两种方式设置跨域规则：

java
// 1、以Json格式的字符串
String jsonBucketCors = "{\"corsConfiguration\": [{\"allowedOrigins\":[\"http://*\""+",\"https://*\"]"+",\"allowedMethods\":[\"GET\""+",\"HEAD\""+",\"POST\""+",\"PUT\"]"+",\"allowedHeaders\":[\"*\"]"+",\"allowedExposeHeaders\":[\"ETag\""+",\"Content-Length\""+",\"x-fos-next-append-offset\""+",\"x-fos-object-type\""+",\"x-fos-request-id\"]"+",\"maxAgeSeconds\":1800}]}";

SetBucketCorsRequest request = new SetBucketCorsRequest();
request.setJsonBucketCors(jsonBucketCors);
request.withBucketName("yourBucketName");
client.setBucketBucketCors(request);
java
// 2、用户只需指定指定参数即可
SetBucketCorsRequest request = new SetBucketCorsRequest();
request.setBucketName("yourBucketName");

List<CorsConfiguration>  corsConfigurations = new ArrayList<CorsConfiguration>();
List<String> allowedOrigins = new ArrayList<String>();
List<AllowedMethods> allowedMethods = new ArrayList<AllowedMethods>();
List<String> allowedHeaders = new ArrayList<String>();
List<String> allowedExposeHeaders = new ArrayList<String>();

CorsConfiguration corsConfiguration = new CorsConfiguration();
CorsConfiguration corsConfiguration1 = new CorsConfiguration();
// AllowedOrigins
allowedOrigins.add("http://www.example.com");
allowedOrigins.add("http://www.example1.com");

allowedMethods.add(AllowedMethods.GET);
allowedMethods.add(AllowedMethods.POST);
allowedMethods.add(AllowedMethods.PUT);
allowedMethods.add(AllowedMethods.DELETE);
// allowedHeaders
allowedHeaders.add("head1");
allowedHeaders.add("head2");
// allowedExposeHeaders
allowedExposeHeaders.add("ETag");
allowedExposeHeaders.add("Content-Length");
allowedExposeHeaders.add("x-fos-next-append-offset");
allowedExposeHeaders.add("x-fos-object-type");

corsConfiguration.setAllowedOrigins(allowedOrigins);
corsConfiguration.setAllowedMethods(allowedMethods);
corsConfiguration.setAllowedHeaders(allowedHeaders);
corsConfiguration.setAllowedExposeHeaders(allowedExposeHeaders);
corsConfiguration.setMaxAgeSeconds(1800);

List<String> allowedOrigins1 = new ArrayList<String>();
List<AllowedMethods> allowedMethods1 = new ArrayList<AllowedMethods>();
List<String> allowedHeaders1 = new ArrayList<String>();
List<String> allowedExposeHeaders1 = new ArrayList<String>();

corsConfigurations.add(corsConfiguration);
// AllowedOrigins
allowedOrigins1.add("allowedOrigin1");
allowedOrigins1.add("allowedOrigin2");
// allowedMethods
allowedMethods1.add(AllowedMethods.GET);
allowedMethods1.add(AllowedMethods.POST);
allowedMethods1.add(AllowedMethods.PUT);
allowedMethods1.add(AllowedMethods.DELETE);
// allowedHeaders
allowedHeaders1.add("head3");
allowedHeaders1.add("head4");
// allowedExposeHeaders
allowedExposeHeaders1.add("ETag");
allowedExposeHeaders1.add("Content-Length");
allowedExposeHeaders1.add("x-fos-next-append-offset");
allowedExposeHeaders1.add("x-fos-object-type");


corsConfiguration1.setAllowedOrigins(allowedOrigins1);
corsConfiguration1.setAllowedMethods(allowedMethods1);
corsConfiguration1.setAllowedHeaders(allowedHeaders1);
corsConfiguration1.setAllowedExposeHeaders(allowedExposeHeaders1);
corsConfiguration1.setMaxAgeSeconds(3600);

corsConfigurations.add(corsConfiguration1);

request.setCorsConfigurationsList(corsConfigurations);
client.setBucketBucketCors(request);

注意：

  • 通过此接口设置CORS规则之前，Bucket的CORS权限设置为不允许跨域。
  • 每个Bucket最多只允许有一个规则文件，因此新上传的规则文件会覆盖原有的。
  • CORS规则文件大小限制为20KB，因此请求时大于20KB会返回超出大小错误（400 Bad Request: EntityTooLarge）。

获取CORS规则 ​

可以通过如下方式获取跨域规则：

java
GetBucketCorsRequest request = new GetBucketCorsRequest();
request.setBucketName("yourBucketName");
GetBucketCorsResponse response = client.getBucketCros(request);

删除CORS规则 ​

可以通过如下方式删除跨域规则：

java
DeleteBucketCorsRequest request = new DeleteBucketCorsRequest("yourBucketName");
client.deleteBucketCors(request);

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