In this quick article, we will discuss step by step how to use Apache HttpClient 4.5 to make an HTTP PUT request. The HTTP PUT Request Method requests that the server accepts and stores the entity enclosed in the supplied URI. If the URI refers to an already existing resource, it is modified; if the URI does not point to an existing resource, then the server can create the resource with that URI.
HttpClient supports out of the box all HTTP methods defined in the HTTP/1.1 specification: GET, HEAD, POST, PUT, DELETE, TRACE, and OPTIONS. There is a specific class for each method type.: HttpGet, HttpHead, HttpPost, HttpPut, HttpDelete, HttpTrace, and HttpOptions.
In this example, we will use HttpPut class to handle PUT HTTP method.
In this example, we will use HttpPut class to handle PUT HTTP method.
Check out below Apache HttpClient related useful articles:
Using the Apache HttpClient
The Apache HttpClient library allows handling HTTP requests. To use this library add a dependency to your Maven or Gradle build file. You find the latest version here: https://mvnrepository.com/artifact/org.apache.httpcomponents/httpclient
We use maven to manage our dependencies and are using Apache HttpClient version 4.5. Add the following dependency to your project in order to make HTTP PUT request method.
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.5</version>
</dependency>
Development Steps
Let's create a step by step example to make an HTTP PUT request using HttpClient.
1. Create instance of CloseableHttpClient using helper class HttpClients.
CloseableHttpClient httpclient = HttpClients.createDefault()
The HttpClients.createDefault() method creates CloseableHttpClient instance with default configuration.
2. Create a basic PUT request
HttpPut httpPut = new HttpPut("http://localhost:8080/api/v1/users/5");
3. Add headers to PUT HTTP Request
HttpPut httpPut = new HttpPut("http://localhost:8080/api/v1/users/5");
httpPut.setHeader("Accept", "application/json");
httpPut.setHeader("Content-type", "application/json");
4. Add JSON Data to PUT request
String json = "{\r\n" +
" \"firstName\": \"Ram\",\r\n" +
" \"lastName\": \"Jadhav\",\r\n" +
" \"emailId\": \"[email protected]\",\r\n" +
" \"createdAt\": \"2018-09-11T11:19:56.000+0000\",\r\n" +
" \"createdBy\": \"Ramesh\",\r\n" +
" \"updatedAt\": \"2018-09-11T11:26:31.000+0000\",\r\n" +
" \"updatedby\": \"Ramesh\"\r\n" +
"}";
StringEntity stringEntity = new StringEntity(json);
httpPut.setEntity(stringEntity);
5. Create a custom response handler
ResponseHandler < String > responseHandler = response - > {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
};
6. Send a basic POST request via execute() Method
String responseBody = httpclient.execute(httpPut, responseHandler);
HttpClient HTTP PUT Request Method Example
Let's discuss how to use HttpClient in real-time projects. Consider we have deployed Spring boot Restful CRUD APIs. Check out this article - Spring Boot 2 + hibernate 5 + CRUD REST API Tutorial.
In the following example, we send a resource to http://localhost:8080/api/v1/users/5. This resource accepts the request JSON, process it and store it into a database. This service also returns a response with an updated resource.In this example, we are using Java 7 try-with-resources to automatically handle the closing of the ClosableHttpClient and we are also using Java 8 lambdas for the ResponseHandler.
package com.javadevelopersguide.httpclient.examples;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
/**
* This example demonstrates the use of {@link HttpPut} request method.
* @author Ramesh Fadatare
*/
public class PUTRequestExample {
public static void main(String[] args) throws IOException {
putUser();
}
public static void putUser() throws IOException {
try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
HttpPut httpPut = new HttpPut("http://localhost:8080/api/v1/users/5");
httpPut.setHeader("Accept", "application/json");
httpPut.setHeader("Content-type", "application/json");
String json = "{\r\n" + " \"firstName\": \"Ram\",\r\n" + " \"lastName\": \"Jadhav\",\r\n" +
" \"emailId\": \"[email protected]\",\r\n" +
" \"createdAt\": \"2018-09-11T11:19:56.000+0000\",\r\n" + " \"createdBy\": \"Ramesh\",\r\n" +
" \"updatedAt\": \"2018-09-11T11:26:31.000+0000\",\r\n" + " \"updatedby\": \"Ramesh\"\r\n" +
"}";
StringEntity stringEntity = new StringEntity(json);
httpPut.setEntity(stringEntity);
System.out.println("Executing request " + httpPut.getRequestLine());
// Create a custom response handler
ResponseHandler < String > responseHandler = response - > {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
};
String responseBody = httpclient.execute(httpPut, responseHandler);
System.out.println("----------------------------------------");
System.out.println(responseBody);
}
}
}
Output
Executing request PUT http://localhost:8080/api/v1/users/5 HTTP/1.1
----------------------------------------
{"id":5,"firstName":"Ram","lastName":"Jadhav","emailId":"[email protected]",
"createdAt":"2018-09-11T11:19:56.000+0000","createdBy":"Ramesh",
"updatedAt":"2018-10-29T09:43:13.756+0000","updatedby":"Ramesh"}
More Examples
In the following example, we put data into the resource http://httpbin.org/put. This resources acknowledges the data and returns a JSON object which we’ll simply print to the console.
package com.javadevelopersguide.httpclient.examples;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpPut;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
/**
* This example demonstrates the use of {@link HttpPut} request method.
*
* @author Ramesh Fadatare
*/
public class PUTRequestExample {
public static void main(String[] args) throws IOException {
put();
}
public static void put() throws IOException {
try (CloseableHttpClient httpclient = HttpClients.createDefault()) {
HttpPut httpPut = new HttpPut("http://httpbin.org/put");
httpPut.setEntity(new StringEntity("Hello, World"));
System.out.println("Executing request " + httpPut.getRequestLine());
// Create a custom response handler
ResponseHandler < String > responseHandler = response - > {
int status = response.getStatusLine().getStatusCode();
if (status >= 200 && status < 300) {
HttpEntity entity = response.getEntity();
return entity != null ? EntityUtils.toString(entity) : null;
} else {
throw new ClientProtocolException("Unexpected response status: " + status);
}
};
String responseBody = httpclient.execute(httpPut, responseHandler);
System.out.println("----------------------------------------");
System.out.println(responseBody);
}
}
}
Output
Executing request PUT http://httpbin.org/put HTTP/1.1
----------------------------------------
{
"args": {},
"data": "Hello, World",
"files": {},
"form": {},
"headers": {
"Accept-Encoding": "gzip,deflate",
"Connection": "close",
"Content-Length": "12",
"Content-Type": "text/plain; charset=ISO-8859-1",
"Host": "httpbin.org",
"User-Agent": "Apache-HttpClient/4.5 (Java/1.8.0_172)"
},
"json": null,
"origin": "49.35.12.218",
"url": "http://httpbin.org/put"
}
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