#218 - Add GridFS example for Spring Data MongoDB.

Original pull request: #229.

mongodb/gridfs/src/main/java/example/springdata/mongodb/gridfs/Customer.java

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+/*
+ * Copyright 2016 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package example.springdata.mongodb.gridfs;
+
+import org.springframework.data.annotation.Id;
+
+public class Customer {
+
+    @Id
+    public String id;
+
+    public String firstName;
+    public String lastName;
+
+    public Customer() {}
+
+    public Customer(String firstName, String lastName) {
+        this.firstName = firstName;
+        this.lastName = lastName;
+    }
+
+
+    public String getId() {
+        return id;
+    }
+
+    public String getFirstName() {
+        return firstName;
+    }
+
+    public String getLastName() {
+        return lastName;
+    }
+
+    @Override
+    public String toString() {
+        return String.format(
+                "Customer[id=%s, firstName='%s', lastName='%s']",
+                id, firstName, lastName);
+    }
+
+}

mongodb/gridfs/src/main/java/example/springdata/mongodb/gridfs/GridFsApplication.java

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+/*
+ * Copyright 2016 the original author or authors.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+
+package example.springdata.mongodb.gridfs;
+
+import com.mongodb.client.gridfs.model.GridFSFile;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.CommandLineRunner;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.core.io.ClassPathResource;
+import org.springframework.data.mongodb.gridfs.GridFsOperations;
+import org.springframework.data.mongodb.gridfs.GridFsResource;
+import org.springframework.util.StreamUtils;
+
+import java.io.BufferedInputStream;
+import java.io.InputStream;
+
+import static org.springframework.data.mongodb.core.query.Query.query;
+import static org.springframework.data.mongodb.gridfs.GridFsCriteria.whereFilename;
+import static org.springframework.data.mongodb.gridfs.GridFsCriteria.whereMetaData;
+
+/**
+ * Spring Boot sample application to show the usage of {@link GridFsOperations} with Spring Data MongoDB.
+ *
+ * @author Hartmut Lang
+ */
+@SpringBootApplication
+public class GridFsApplication implements CommandLineRunner {
+
+    @Autowired
+    private GridFsOperations gridFsOperations;
+
+	public static void main(String[] args) {
+		SpringApplication.run(GridFsApplication.class, args);
+	}
+
+    @Override
+    public void run(String... strings) throws Exception {
+
+	    // store file
+        try (InputStream is = new BufferedInputStream(new ClassPathResource("./myFile1.txt").getInputStream())) {
+            gridFsOperations.store(is, "myFile1.txt");
+        }
+
+        // get file or resource by filename
+        GridFSFile gridFsFile1 = gridFsOperations.findOne(query(whereFilename().is("myFile1.txt")));
+        System.out.println("Filename: " + gridFsFile1.getFilename() +", MD5: " + gridFsFile1.getMD5());
+        GridFsResource gridRes1 = gridFsOperations.getResource("myFile1.txt");
+        StreamUtils.copy(gridRes1.getInputStream(), System.out);
+
+        // store file with metaData
+        try (InputStream is = new BufferedInputStream(new ClassPathResource("./myCustomerFile.txt").getInputStream())) {
+            Customer customerMetaData = new Customer("Hardy", "Lang");
+            gridFsOperations.store(is, "myCustomerFile.txt", customerMetaData);
+        }
+
+        // search by metaData
+        GridFSFile gridFsFile2 = gridFsOperations.findOne(query(whereMetaData("firstName").is("Hardy")));
+        System.out.println("Filename: " + gridFsFile2.getFilename() +", MD5: " + gridFsFile2.getMD5());
+        GridFsResource gridRes2 = gridFsOperations.getResource(gridFsFile2.getFilename());
+        StreamUtils.copy(gridRes2.getInputStream(), System.out);
+    }
+}

mongodb/gridfs/src/main/resources/application.properties

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+#spring.data.mongodb.grid-fs-database=dbfs

mongodb/gridfs/src/main/resources/myCustomerFile.txt

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+This is my example file.
+It gets added as file to gridFs.

mongodb/gridfs/src/main/resources/myFile1.txt

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+Just a simple file to add to GridFS