Update Storageblob sample (#171)

storage/spring-cloud-azure-starter-storage-blob/storage-blob-sample/README.md

@@ -110,16 +110,36 @@ mvn clean spring-boot:run
 ```
 
 ## Verify This Sample
-Send a POST request to update file contents:
-```shell
-curl http://localhost:8080/blob -d "new message" -H "Content-Type: text/plain"
-```
-
-Verify by sending a GET request
+1. Write and read a file.  
+    1.1 Send a POST request to update file contents.
+    ```shell
+    curl http://localhost:8080/blob -d "new message" -H "Content-Type: text/plain"
+    ```
+    1.2 Verify by sending a GET request.  
+    ```shell
+    curl -XGET http://localhost:8080/blob
+    ```
+
+2. [Optional] Using resourceLoader to get Azure Storage Blob resource with filename.
+    ```shell
+    curl -XGET http://localhost:8080/blob/getResourceWithResourceLoader/fileName1.txt
+    ```
+
+    Verify in app's log that a similar messages was posted:
+    ```shell
+    Blob content retrieved: fileName=fileName1.txt, fileContent=data1
+    ```
+
+3. [Optional] Using AzureStorageBlobProtocolResolver to get Azure Storage Blob resources with file pattern.
+    ```shell
+    curl -XGET http://localhost:8080/blob/getFileNamesWithProtocolResolver
+    ```
+    
+    Verify in app's log that a similar messages was posted:
+    ```shell
+    10 resources founded with pattern:*.txt
+    ```
 
-```shell
-curl -XGET http://localhost:8080/blob
-```
 
 ## Clean Up Resources
 After running the sample, if you don't want to run the sample, remember to destroy the Azure resources you created to avoid unnecessary billing.

storage/spring-cloud-azure-starter-storage-blob/storage-blob-sample/src/main/java/com/azure/spring/sample/storage/resource/BlobController.java

@@ -3,10 +3,14 @@
 
 package com.azure.spring.sample.storage.resource;
 
+import com.azure.spring.core.resource.AzureStorageBlobProtocolResolver;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
 import org.springframework.beans.factory.annotation.Value;
 import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
 import org.springframework.core.io.WritableResource;
 import org.springframework.util.StreamUtils;
 import org.springframework.web.bind.annotation.*;
@@ -24,13 +28,56 @@ public class BlobController {
 
     final static Logger logger = LoggerFactory.getLogger(BlobController.class);
 
-    public BlobController() {
-        logger.info("spring.cloud.azure.storage.blob.endpoint configured");
-    }
-
     @Value("${resource.blob}")
     private Resource azureBlobResource;
 
+    @Value("${storage-container-name}")
+    private String containerName;
+
+    @Autowired
+    @Qualifier("webApplicationContext")
+    private ResourceLoader resourceLoader;
+
+    @Autowired
+    private AzureStorageBlobProtocolResolver azureStorageBlobProtocolResolver;
+
+    /**
+     * Using resourceLoader to get Azure Storage Blob resource with filename.
+     *
+     * @param fileName the fileName(contains extension name) stored in Storage Blob Container.
+     *                 eg: fileName = fileName1.txt
+     * @return the content stored in the file.
+     * @throws IOException
+     */
+    @GetMapping("/getResourceWithResourceLoader/{fileName}")
+    public String getResourceWithResourceLoader(@PathVariable String fileName) throws IOException {
+        // get a BlobResource
+        Resource storageBlobResource = resourceLoader.getResource("azure-blob://" + containerName + "/" + fileName);
+        String fileContent = StreamUtils.copyToString(
+                storageBlobResource.getInputStream(),
+                Charset.defaultCharset());
+        logger.info("Blob content retrieved: fileName={}, fileContent={}", fileName, fileContent);
+        return "fileContent=" + fileContent;
+    }
+
+    /**
+     * Using AzureStorageBlobProtocolResolver to get Azure Storage Blob resources with file pattern.
+     *
+     * @return fileNames in the container match pattern: *.txt
+     * @throws IOException
+     */
+    @GetMapping("/getFileNamesWithProtocolResolver")
+    public String getFileNamesWithProtocolResolver() throws IOException {
+        Resource[] resources = azureStorageBlobProtocolResolver.getResources("azure-blob://" + containerName + "/*.txt");
+        logger.info("{} resources founded with pattern:*.txt",resources.length);
+        StringBuffer sb = new StringBuffer();
+        for (Resource resource : resources) {
+            sb.append(resource.getFilename())
+                    .append("\n");
+        }
+        return sb.toString();
+    }
+
     @GetMapping
     public String readBlobResource() throws IOException {
         return StreamUtils.copyToString(

storage/spring-cloud-azure-starter-storage-blob/storage-blob-sample/src/main/java/com/azure/spring/sample/storage/resource/StorageApplication.java

@@ -3,16 +3,59 @@
 
 package com.azure.spring.sample.storage.resource;
 
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Qualifier;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.boot.CommandLineRunner;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.core.io.Resource;
+import org.springframework.core.io.ResourceLoader;
+import org.springframework.core.io.WritableResource;
+
+import java.io.OutputStream;
 
 /**
  * @author Warren Zhu
  */
 @SpringBootApplication
-public class StorageApplication {
+public class StorageApplication implements CommandLineRunner {
+    final static Logger logger = LoggerFactory.getLogger(StorageApplication.class);
+
+    @Autowired
+    @Qualifier("webApplicationContext")
+    private ResourceLoader resourceLoader;
+
+    @Value("${storage-container-name}")
+    private String containerName;
 
     public static void main(String[] args) {
         SpringApplication.run(StorageApplication.class, args);
     }
+
+    /**
+     * This is used to initialize some data in Azure Storage Blob.
+     * So users can use `curl -XGET http://localhost:8080/blob/getFileNamesWithProtocolResolver` to test
+     * AzureStorageBlobProtocolResolver without initializing data.
+     *
+     * @param args
+     * @throws Exception
+     */
+    @Override
+    public void run(String... args) throws Exception {
+
+        logger.info("StorageApplication data initialization begin ...");
+        for (int i = 0; i < 10; i++) {
+            String fileName = "fileName" + i;
+            String data = "data" + i;
+            Resource storageBlobResource = resourceLoader.getResource("azure-blob://" +containerName+"/" + fileName + ".txt");
+            try (OutputStream os = ((WritableResource) storageBlobResource).getOutputStream()) {
+                os.write(data.getBytes());
+                logger.info("write data to container={}, fileName={}", containerName, fileName);
+            }
+        }
+        logger.info("StorageApplication data initialization end ...");
+    }
 }