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JAVA-4010: Added new module and moved 3 articles to it

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sampadawagde 2021-01-15 23:15:41 +05:30
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spring-web-modules/spring-resttemplate-3/.gitignore vendored Normal file
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*.class
#folders#
/target
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear

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spring-web-modules/spring-resttemplate-3/README.md Normal file
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## Spring RestTemplate
This module contains articles about Spring RestTemplate
### The Course
The "REST With Spring" Classes: http://bit.ly/restwithspring
### Relevant Articles:
- [Uploading MultipartFile with Spring RestTemplate](https://www.baeldung.com/spring-rest-template-multipart-upload)
- [Get and Post Lists of Objects with RestTemplate](https://www.baeldung.com/spring-rest-template-list)
- [Download a Large File Through a Spring RestTemplate](https://www.baeldung.com/spring-resttemplate-download-large-file)

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spring-web-modules/spring-resttemplate-3/pom.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>spring-resttemplate-3</artifactId>
<version>0.1-SNAPSHOT</version>
<name>spring-resttemplate-3</name>
<packaging>war</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-boot-2</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-2</relativePath>
</parent>
<dependencies>
<!-- Spring Boot Dependencies -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
</dependencies>
</project>

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/resttemplate/lists/EmployeeApplication.java Normal file
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package com.baeldung.resttemplate.lists;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* Sample application used to demonstrate working with Lists and RestTemplate.
*/
@SpringBootApplication
public class EmployeeApplication
{
public static void main(String[] args)
{
SpringApplication.run(EmployeeApplication.class, args);
}
}

120
spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/resttemplate/lists/client/EmployeeClient.java Normal file
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package com.baeldung.resttemplate.lists.client;
import com.baeldung.resttemplate.lists.dto.Employee;
import com.baeldung.resttemplate.lists.dto.EmployeeList;
import org.springframework.core.ParameterizedTypeReference;
import org.springframework.http.HttpMethod;
import org.springframework.http.ResponseEntity;
import org.springframework.web.client.RestTemplate;
import java.util.ArrayList;
import java.util.List;
import static java.util.Arrays.asList;
/**
* Application that shows how to use Lists with RestTemplate.
*/
public class EmployeeClient {
public static void main(String[] args) {
EmployeeClient employeeClient = new EmployeeClient();
System.out.println("Calling GET for entity using arrays");
employeeClient.getForEntityEmployeesAsArray();
System.out.println("Calling GET using ParameterizedTypeReference");
employeeClient.getAllEmployeesUsingParameterizedTypeReference();
System.out.println("Calling GET using wrapper class");
employeeClient.getAllEmployeesUsingWrapperClass();
System.out.println("Calling POST using normal lists");
employeeClient.createEmployeesUsingLists();
System.out.println("Calling POST using wrapper class");
employeeClient.createEmployeesUsingWrapperClass();
}
public EmployeeClient() {
}
public Employee[] getForEntityEmployeesAsArray() {
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<Employee[]> response =
restTemplate.getForEntity(
"http://localhost:8082/spring-rest/employees/",
Employee[].class);
Employee[] employees = response.getBody();
assert employees != null;
asList(employees).forEach(System.out::println);
return employees;
}
public List<Employee> getAllEmployeesUsingParameterizedTypeReference() {
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<List<Employee>> response =
restTemplate.exchange(
"http://localhost:8082/spring-rest/employees/",
HttpMethod.GET,
null,
new ParameterizedTypeReference<List<Employee>>() {
});
List<Employee> employees = response.getBody();
assert employees != null;
employees.forEach(System.out::println);
return employees;
}
public List<Employee> getAllEmployeesUsingWrapperClass() {
RestTemplate restTemplate = new RestTemplate();
EmployeeList response =
restTemplate.getForObject(
"http://localhost:8082/spring-rest/employees/v2",
EmployeeList.class);
List<Employee> employees = response.getEmployees();
employees.forEach(System.out::println);
return employees;
}
public void createEmployeesUsingLists() {
RestTemplate restTemplate = new RestTemplate();
List<Employee> newEmployees = new ArrayList<>();
newEmployees.add(new Employee(3, "Intern"));
newEmployees.add(new Employee(4, "CEO"));
restTemplate.postForObject(
"http://localhost:8082/spring-rest/employees/",
newEmployees,
ResponseEntity.class);
}
public void createEmployeesUsingWrapperClass() {
RestTemplate restTemplate = new RestTemplate();
List<Employee> newEmployees = new ArrayList<>();
newEmployees.add(new Employee(3, "Intern"));
newEmployees.add(new Employee(4, "CEO"));
restTemplate.postForObject(
"http://localhost:8082/spring-rest/employees/v2/",
new EmployeeList(newEmployees),
ResponseEntity.class);
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/resttemplate/lists/controller/EmployeeResource.java Normal file
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package com.baeldung.resttemplate.lists.controller;
import org.springframework.beans.factory.annotation.Autowired;
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.RestController;
import com.baeldung.resttemplate.lists.dto.Employee;
import com.baeldung.resttemplate.lists.dto.EmployeeList;
import com.baeldung.resttemplate.lists.service.EmployeeService;
import java.util.List;
@RestController
@RequestMapping("/employees")
public class EmployeeResource
{
@Autowired
private EmployeeService employeeService;
@RequestMapping(method = RequestMethod.GET, path = "/")
public List<Employee> getEmployees()
{
return employeeService.getAllEmployees();
}
@RequestMapping(method = RequestMethod.GET, path = "/v2")
public EmployeeList getEmployeesUsingWrapperClass()
{
List<Employee> employees = employeeService.getAllEmployees();
return new EmployeeList(employees);
}
@RequestMapping(method = RequestMethod.POST, path = "/")
public void addEmployees(@RequestBody List<Employee> employees)
{
employeeService.addEmployees(employees);
}
@RequestMapping(method = RequestMethod.POST, path = "/v2")
public void addEmployeesUsingWrapperClass(@RequestBody EmployeeList employeeWrapper)
{
employeeService.addEmployees(employeeWrapper.getEmployees());
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/resttemplate/lists/dto/Employee.java Normal file
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package com.baeldung.resttemplate.lists.dto;
public class Employee {
public long id;
public String title;
public Employee()
{
}
public Employee(long id, String title)
{
this.id = id;
this.title = title;
}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
@Override
public String toString()
{
return "Employee #" + id + "[" + title + "]";
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/resttemplate/lists/dto/EmployeeList.java Normal file
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package com.baeldung.resttemplate.lists.dto;
import java.util.ArrayList;
import java.util.List;
public class EmployeeList
{
public List<Employee> employees;
public EmployeeList()
{
employees = new ArrayList<>();
}
public EmployeeList(List<Employee> employees)
{
this.employees = employees;
}
public void setEmployees(List<Employee> employees)
{
this.employees = employees;
}
public List<Employee> getEmployees()
{
return employees;
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/resttemplate/lists/service/EmployeeService.java Normal file
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package com.baeldung.resttemplate.lists.service;
import org.springframework.stereotype.Service;
import com.baeldung.resttemplate.lists.dto.Employee;
import java.util.ArrayList;
import java.util.List;
@Service("EmployeeListService")
public class EmployeeService
{
public List<Employee> getAllEmployees()
{
List<Employee> employees = new ArrayList<>();
employees.add(new Employee(1, "Manager"));
employees.add(new Employee(2, "Java Developer"));
return employees;
}
public void addEmployees(List<Employee> employees)
{
employees.forEach(e -> System.out.println("Adding new employee " + e));
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/web/upload/app/UploadApplication.java Normal file
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package com.baeldung.web.upload.app;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.support.SpringBootServletInitializer;
import org.springframework.context.annotation.ComponentScan;
@EnableAutoConfiguration
@ComponentScan("com.baeldung.web.upload")
@SpringBootApplication
public class UploadApplication extends SpringBootServletInitializer {
public static void main(final String[] args) {
SpringApplication.run(UploadApplication.class, args);
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/web/upload/client/MultipartFileUploadClient.java Normal file
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package com.baeldung.web.upload.client;
import org.springframework.core.io.FileSystemResource;
import org.springframework.core.io.Resource;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.util.LinkedMultiValueMap;
import org.springframework.util.MultiValueMap;
import org.springframework.web.client.RestTemplate;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Path;
public class MultipartFileUploadClient {
public static void main(String[] args) throws IOException {
uploadSingleFile();
uploadMultipleFile();
}
private static void uploadSingleFile() throws IOException {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
body.add("file", getTestFile());
HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
String serverUrl = "http://localhost:8082/spring-rest/fileserver/singlefileupload/";
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<String> response = restTemplate.postForEntity(serverUrl, requestEntity, String.class);
System.out.println("Response code: " + response.getStatusCode());
}
private static void uploadMultipleFile() throws IOException {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.MULTIPART_FORM_DATA);
MultiValueMap<String, Object> body = new LinkedMultiValueMap<>();
body.add("files", getTestFile());
body.add("files", getTestFile());
body.add("files", getTestFile());
HttpEntity<MultiValueMap<String, Object>> requestEntity = new HttpEntity<>(body, headers);
String serverUrl = "http://localhost:8082/spring-rest/fileserver/multiplefileupload/";
RestTemplate restTemplate = new RestTemplate();
ResponseEntity<String> response = restTemplate.postForEntity(serverUrl, requestEntity, String.class);
System.out.println("Response code: " + response.getStatusCode());
}
public static Resource getTestFile() throws IOException {
Path testFile = Files.createTempFile("test-file", ".txt");
System.out.println("Creating and Uploading Test File: " + testFile);
Files.write(testFile, "Hello World !!, This is a test file.".getBytes());
return new FileSystemResource(testFile.toFile());
}
}

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spring-web-modules/spring-resttemplate-3/src/main/java/com/baeldung/web/upload/controller/FileServerResource.java Normal file
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package com.baeldung.web.upload.controller;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
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.RestController;
import org.springframework.web.multipart.MultipartFile;
import java.io.IOException;
import java.util.List;
@RestController
@RequestMapping("/fileserver")
public class FileServerResource {
@RequestMapping(path = "/singlefileupload/", method = RequestMethod.POST)
public ResponseEntity<String> processFile(@RequestParam("file") MultipartFile file) throws IOException {
byte[] bytes = file.getBytes();
System.out.println("File Name: " + file.getOriginalFilename());
System.out.println("File Content Type: " + file.getContentType());
System.out.println("File Content:\n" + new String(bytes));
return (new ResponseEntity<>("Successful", null, HttpStatus.OK));
}
@RequestMapping(path = "/multiplefileupload/", method = RequestMethod.POST)
public ResponseEntity<String> processFile(@RequestParam("files") List<MultipartFile> files) throws IOException {
for (MultipartFile file : files) {
byte[] bytes = file.getBytes();
System.out.println("File Name: " + file.getOriginalFilename());
System.out.println("File Content Type: " + file.getContentType());
System.out.println("File Content:\n" + new String(bytes));
}
return (new ResponseEntity<>("Successful", null, HttpStatus.OK));
}
}

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spring-web-modules/spring-resttemplate-3/src/main/resources/application.properties Normal file
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server.port=8082
server.servlet.context-path=/spring-rest

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spring-web-modules/spring-resttemplate-3/src/main/resources/logback.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework.web.filter.CommonsRequestLoggingFilter">
<level value="DEBUG" />
</logger>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>

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spring-web-modules/spring-resttemplate-3/src/test/java/com/baeldung/SpringContextTest.java Normal file
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package com.baeldung;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
@RunWith(SpringRunner.class)
@SpringBootTest(classes = { com.baeldung.web.upload.app.UploadApplication.class, })
public class SpringContextTest {
@Test
public void whenSpringContextIsBootstrapped_thenNoExceptions() {
}
}

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spring-web-modules/spring-resttemplate-3/src/test/java/com/baeldung/largefile/LargeFileDownloadIntegrationTest.java Normal file
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package com.baeldung.largefile;
import java.io.File;
import java.io.FileOutputStream;
import org.assertj.core.api.Assertions;
import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.util.StreamUtils;
import org.springframework.web.client.RestTemplate;
public class LargeFileDownloadIntegrationTest {
static String FILE_URL = "http://ovh.net/files/1Mio.dat";
RestTemplate restTemplate;
@Before
public void setUp() {
restTemplate = new RestTemplate();
}
@Test
public void givenResumableUrl_whenUrlCalledByHeadOption_thenExpectHeadersAvailable() {
HttpHeaders headers = restTemplate.headForHeaders(FILE_URL);
Assertions
.assertThat(headers.get("Accept-Ranges"))
.contains("bytes");
Assertions
.assertThat(headers.getContentLength())
.isGreaterThan(0);
}
@Test
public void givenResumableUrl_whenDownloadCompletely_thenExpectCorrectFileSize() {
HttpHeaders headers = restTemplate.headForHeaders(FILE_URL);
long contentLength = headers.getContentLength();
File file = restTemplate.execute(FILE_URL, HttpMethod.GET, null, clientHttpResponse -> {
File ret = File.createTempFile("download", "tmp");
StreamUtils.copy(clientHttpResponse.getBody(), new FileOutputStream(ret));
return ret;
});
Assert.assertNotNull(file);
Assertions
.assertThat(file.length())
.isEqualTo(contentLength);
}
@Test
public void givenResumableUrl_whenDownloadRange_thenExpectFileSizeEqualOrLessThanRange() {
int range = 10;
File file = restTemplate.execute(FILE_URL, HttpMethod.GET, clientHttpRequest -> clientHttpRequest
.getHeaders()
.set("Range", String.format("bytes=0-%d", range - 1)), clientHttpResponse -> {
File ret = File.createTempFile("download", "tmp");
StreamUtils.copy(clientHttpResponse.getBody(), new FileOutputStream(ret));
return ret;
});
Assert.assertNotNull(file);
Assertions
.assertThat(file.length())
.isLessThanOrEqualTo(range);
}
@Test
public void givenResumableUrl_whenPauseDownloadAndResume_thenExpectCorrectFileSize() {
int range = 10;
HttpHeaders headers = restTemplate.headForHeaders(FILE_URL);
long contentLength = headers.getContentLength();
File file = restTemplate.execute(FILE_URL, HttpMethod.GET, clientHttpRequest -> clientHttpRequest
.getHeaders()
.set("Range", String.format("bytes=0-%d", range - 1)), clientHttpResponse -> {
File ret = File.createTempFile("download", "tmp");
StreamUtils.copy(clientHttpResponse.getBody(), new FileOutputStream(ret));
return ret;
});
Assert.assertNotNull(file);
Assertions
.assertThat(file.length())
.isLessThanOrEqualTo(range);
restTemplate.execute(FILE_URL, HttpMethod.GET, clientHttpRequest -> clientHttpRequest
.getHeaders()
.set("Range", String.format("bytes=%d-%d", file.length(), contentLength)), clientHttpResponse -> {
StreamUtils.copy(clientHttpResponse.getBody(), new FileOutputStream(file, true));
return file;
});
Assertions
.assertThat(file.length())
.isEqualTo(contentLength);
}
}

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spring-web-modules/spring-resttemplate-3/src/test/resources/.gitignore vendored Normal file
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*.class
#folders#
/target
/neoDb*
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
# Packaged files #
*.jar
*.war
*.ear

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spring-web-modules/spring-resttemplate-3/src/test/resources/logback-test.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
</pattern>
</encoder>
</appender>
<logger name="org.springframework.web.filter.CommonsRequestLoggingFilter">
<level value="DEBUG" />
</logger>
<logger name="org.springframework" level="WARN" />
<logger name="org.springframework.transaction" level="WARN" />
<!-- in order to debug some marshalling issues, this needs to be TRACE -->
<logger name="org.springframework.web.servlet.mvc" level="WARN" />
<root level="INFO">
<appender-ref ref="STDOUT" />
</root>
</configuration>