adding some simple persistence

spring-5/pom.xml

@@ -18,12 +18,6 @@
         <relativePath /> <!-- lookup parent from repository -->
     </parent>
 
-	<properties>
-		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
-		<java.version>1.8</java.version>
-	</properties>
-
     <dependencies>
         <dependency>
             <groupId>org.springframework.boot</groupId>
@@ -42,6 +36,14 @@
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
 
+        <!-- utils -->
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+        </dependency>
+
+        <!-- runtime and test scoped -->
+
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-devtools</artifactId>
@@ -105,4 +107,10 @@
         </pluginRepository>
     </pluginRepositories>
 
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+        <java.version>1.8</java.version>
+    </properties>
+
 </project>

spring-5/src/main/java/com/baeldung/Spring5Application.java

@@ -9,4 +9,5 @@ public class Spring5Application {
     public static void main(String[] args) {
         SpringApplication.run(Spring5Application.class, args);
     }
+
 }

spring-5/src/main/java/com/baeldung/persistence/DataSetupBean.java

@@ -0,0 +1,26 @@
+package com.baeldung.persistence;
+
+import static org.apache.commons.lang3.RandomStringUtils.randomAlphabetic;
+
+import java.util.stream.IntStream;
+
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Component;
+
+import com.baeldung.web.Foo;
+
+@Component
+public class DataSetupBean implements InitializingBean {
+
+    @Autowired
+    private FooRepository repo;
+
+    //
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        IntStream.range(1, 20).forEach(i -> repo.save(new Foo(randomAlphabetic(8))));
+    }
+
+}

spring-5/src/main/java/com/baeldung/persistence/FooRepository.java

@@ -0,0 +1,10 @@
+package com.baeldung.persistence;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.data.jpa.repository.JpaSpecificationExecutor;
+
+import com.baeldung.web.Foo;
+
+public interface FooRepository extends JpaRepository<Foo, Long>, JpaSpecificationExecutor<Foo> {
+
+}

spring-5/src/main/java/com/baeldung/web/Foo.java

@@ -0,0 +1,84 @@
+package com.baeldung.web;
+
+import javax.persistence.Entity;
+import javax.persistence.GeneratedValue;
+import javax.persistence.GenerationType;
+import javax.persistence.Id;
+
+@Entity
+public class Foo {
+
+    @Id
+    @GeneratedValue(strategy = GenerationType.AUTO)
+    private long id;
+
+    private String name;
+
+    public Foo() {
+        super();
+    }
+
+    public Foo(final String name) {
+        super();
+
+        this.name = name;
+    }
+
+    public Foo(final long id, final String name) {
+        super();
+
+        this.id = id;
+        this.name = name;
+    }
+
+    // API
+
+    public long getId() {
+        return id;
+    }
+
+    public void setId(final long id) {
+        this.id = id;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(final String name) {
+        this.name = name;
+    }
+
+    //
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = 1;
+        result = prime * result + ((name == null) ? 0 : name.hashCode());
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj)
+            return true;
+        if (obj == null)
+            return false;
+        if (getClass() != obj.getClass())
+            return false;
+        Foo other = (Foo) obj;
+        if (name == null) {
+            if (other.name != null)
+                return false;
+        } else if (!name.equals(other.name))
+            return false;
+        return true;
+    }
+
+    @Override
+    public String toString() {
+        return "Foo [name=" + name + "]";
+    }
+
+}

spring-5/src/main/java/com/baeldung/web/FooController.java

@@ -0,0 +1,62 @@
+package com.baeldung.web;
+
+import java.util.List;
+
+import javax.validation.constraints.Max;
+import javax.validation.constraints.Min;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Page;
+import org.springframework.data.domain.PageRequest;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestMethod;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseBody;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+import com.baeldung.persistence.FooRepository;
+
+@RestController("/foos")
+public class FooController {
+
+    @Autowired
+    private FooRepository repo;
+
+    // API - read
+
+    @RequestMapping(method = RequestMethod.GET, value = "/foos/{id}")
+    @ResponseBody
+    @Validated
+    public Foo findById(@PathVariable @Min(0) final long id) {
+        return repo.findOne(id);
+    }
+
+    @RequestMapping(method = RequestMethod.GET)
+    @ResponseBody
+    public List<Foo> findAll() {
+        return repo.findAll();
+    }
+
+    @RequestMapping(params = { "page", "size" }, method = RequestMethod.GET)
+    @ResponseBody
+    @Validated
+    public List<Foo> findPaginated(@RequestParam("page") @Min(0) final int page, @Max(100) @RequestParam("size") final int size) {
+        final Page<Foo> resultPage = repo.findAll(new PageRequest(page, size));
+        return resultPage.getContent();
+    }
+
+    // API - write
+
+    @RequestMapping(method = RequestMethod.PUT, value = "/foos/{id}")
+    @ResponseStatus(HttpStatus.OK)
+    @ResponseBody
+    public Foo update(@PathVariable("id") final String id, @RequestBody final Foo foo) {
+        return foo;
+    }
+
+}

spring-5/src/main/resources/application.properties

@@ -1 +1,4 @@
 server.port=8081
+
+security.user.name=user
+security.user.password=pass