{"id":1842,"date":"2012-09-11T13:00:00","date_gmt":"2012-09-11T13:00:00","guid":{"rendered":"http:\/\/www.javacodegeeks.com\/2012\/10\/simple-rest-client-in-java.html"},"modified":"2018-01-09T15:37:54","modified_gmt":"2018-01-09T13:37:54","slug":"simple-rest-client-in-java","status":"publish","type":"post","link":"https:\/\/www.javacodegeeks.com\/2012\/09\/simple-rest-client-in-java.html","title":{"rendered":"Simple REST client in Java"},"content":{"rendered":"
Today most of the mobile applications that used to communicate to some server use REST<\/a> services. These services are also common practice to use with JavaScript or jQuery. Right now I know 2 ways to create client for REST service in java and in this article I will try to demonstrate both the ways I know hoping that it will help someone in some way. <\/p>\n

1. Using Apache HttpClient<\/strong><\/p>\n

The Apache HttpClient library simplifies handling HTTP requests. To use this library you have to download the binaries with dependencies from their website<\/a>.
\nHere is the code for HTTP GET method:
\n 
\n 
\n[ulp id=’bPg3NMopy8SOwFxv’]<\/p>\n

import java.io.BufferedReader;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport org.apache.http.HttpResponse;\r\nimport org.apache.http.client.ClientProtocolException;\r\nimport org.apache.http.client.HttpClient;\r\nimport org.apache.http.client.methods.HttpGet;\r\nimport org.apache.http.impl.client.DefaultHttpClient;\r\npublic class Test {\r\n public static void main(String[] args) throws ClientProtocolException, IOException {\r\n  HttpClient client = new DefaultHttpClient();\r\n  HttpGet request = new HttpGet('http:\/\/restUrl');\r\n  HttpResponse response = client.execute(request);\r\n  BufferedReader rd = new BufferedReader (new InputStreamReader(response.getEntity().getContent()));\r\n  String line = '';\r\n  while ((line = rd.readLine()) != null) {\r\n    System.out.println(line);\r\n  }\r\n }\r\n}<\/pre>\n
And for Post method; for sending simple string in post:      <\/p>\n
import java.io.BufferedReader;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport org.apache.http.HttpResponse;\r\nimport org.apache.http.client.ClientProtocolException;\r\nimport org.apache.http.client.HttpClient;\r\nimport org.apache.http.client.methods.HttpPost;\r\nimport org.apache.http.entity.StringEntity;\r\nimport org.apache.http.impl.client.DefaultHttpClient;\r\npublic class Test {\r\n public static void main(String[] args) throws ClientProtocolException, IOException {\r\n  HttpClient client = new DefaultHttpClient();\r\n  HttpPost post = new HttpPost('http:\/\/restUrl');\r\n  StringEntity input = new StringEntity('product');\r\n  post.setEntity(input);\r\n  HttpResponse response = client.execute(post);\r\n  BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));\r\n  String line = '';\r\n  while ((line = rd.readLine()) != null) {\r\n   System.out.println(line);\r\n  }\r\n }\r\n}<\/pre>\n
You can also send full       JSON<\/a> or       XML<\/a> of a       POJO<\/a> by putting String representing JSON or XML as a parameter of StringEntity and then set the input content type. Something like this:      
 
<\/div> <\/div><\/p>\n
StringEntity input = new StringEntity('{\\'name1\\':\\'value1\\',\\'name2\\':\\'value2\\'}'); \/\/here instead of JSON you can also have XML\r\ninput.setContentType('application\/json');<\/pre>\n
For JSON you can use JSONObject to create string representation of JSON.      <\/p>\n
JSONObject json = new JSONObject();\r\njson.put('name1', 'value1');\r\njson.put('name2', 'value2');\r\nStringEntity se = new StringEntity( json.toString());<\/pre>\n
And for sending multiple parameter in post request:      <\/p>\n
import java.io.BufferedReader;\r\nimport java.io.IOException;\r\nimport java.io.InputStreamReader;\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\nimport org.apache.http.HttpResponse;\r\nimport org.apache.http.client.ClientProtocolException;\r\nimport org.apache.http.client.HttpClient;\r\nimport org.apache.http.client.entity.UrlEncodedFormEntity;\r\nimport org.apache.http.client.methods.HttpPost;\r\nimport org.apache.http.impl.client.DefaultHttpClient;\r\nimport org.apache.http.message.BasicNameValuePair;\r\npublic class Test {\r\n public static void main(String[] args) throws ClientProtocolException, IOException {\r\n  HttpClient client = new DefaultHttpClient();\r\n  HttpPost post = new HttpPost('http:\/\/restUrl');\r\n  List nameValuePairs = new ArrayList(1);\r\n  nameValuePairs.add(new BasicNameValuePair('name', 'value')); \/\/you can as many name value pair as you want in the list.\r\n  post.setEntity(new UrlEncodedFormEntity(nameValuePairs));\r\n  HttpResponse response = client.execute(post);\r\n  BufferedReader rd = new BufferedReader(new InputStreamReader(response.getEntity().getContent()));\r\n  String line = '';\r\n  while ((line = rd.readLine()) != null) {\r\n   System.out.println(line);\r\n  }\r\n }\r\n}\r\n<\/pre>\n
2. Using Jersey<\/strong>       <\/p>\n
Jersey<\/a> is the reference implementation forJSR-311<\/a> specification, the specification of REST support in Java. Jersey contains basically a REST server and a REST client. it provides a library to communicate with the server producing REST services. For http get method:<\/p>\n
import java.io.IOException;\r\nimport javax.ws.rs.core.MediaType;\r\nimport javax.ws.rs.core.UriBuilder;\r\nimport org.apache.http.client.ClientProtocolException;\r\nimport com.sun.jersey.api.client.Client;\r\nimport com.sun.jersey.api.client.WebResource;\r\nimport com.sun.jersey.api.client.config.ClientConfig;\r\nimport com.sun.jersey.api.client.config.DefaultClientConfig;\r\npublic class Test {\r\n public static void main(String[] args) throws ClientProtocolException, IOException {\r\n  ClientConfig config = new DefaultClientConfig();\r\n  Client client = Client.create(config);\r\n  WebResource service = client.resource(UriBuilder.fromUri('http:\/\/restUrl').build());\r\n  \/\/ getting XML data\r\n  System.out.println(service. path('restPath').path('resourcePath').accept(MediaType.APPLICATION_JSON).get(String.class));\r\n  \/\/ getting JSON data\r\n  System.out.println(service. path('restPath').path('resourcePath').accept(MediaType.APPLICATION_XML).get(String.class));\r\n }\r\n}<\/pre>\n
There are also other media formats in which you can get the response like PLAIN or HTML.
\nAnd for HTTP POST method:      <\/p>\n
import java.io.IOException;\r\nimport javax.ws.rs.core.MediaType;\r\nimport javax.ws.rs.core.MultivaluedMap;\r\nimport javax.ws.rs.core.UriBuilder;\r\nimport org.apache.http.client.ClientProtocolException;\r\nimport com.sun.jersey.api.client.Client;\r\nimport com.sun.jersey.api.client.ClientResponse;\r\nimport com.sun.jersey.api.client.WebResource;\r\nimport com.sun.jersey.api.client.config.ClientConfig;\r\nimport com.sun.jersey.api.client.config.DefaultClientConfig;\r\nimport com.sun.jersey.core.util.MultivaluedMapImpl;\r\npublic class Test {\r\n public static void main(String[] args) throws ClientProtocolException, IOException {\r\n  ClientConfig config = new DefaultClientConfig();\r\n  Client client = Client.create(config);\r\n  WebResource webResource = client.resource(UriBuilder.fromUri('http:\/\/restUrl').build());\r\n  MultivaluedMap formData = new MultivaluedMapImpl();\r\n  formData.add('name1', 'val1');\r\n  formData.add('name2', 'val2');\r\n  ClientResponse response = webResource.type(MediaType.APPLICATION_FORM_URLENCODED_TYPE).post(ClientResponse.class, formData);\r\n  System.out.println('Response ' + response.getEntity(String.class));\r\n }\r\n}<\/pre>\n
If you are using your POJO in the POST then you can do something like following:      <\/p>\n
ClientResponse response = webResource.path('restPath').path('resourcePath').\r\ntype(MediaType.APPLICATION_JSON).accept(MediaType.APPLICATION_JSON).post(ClientResponse.class, myPojo);\r\nSystem.out.println('Response ' + response.getEntity(String.class));<\/pre>\n
Here myPojo is an instance of custom POJO class.
\nYou can also use Form class from Jersey to submit multiple parameters in POST request:      <\/p>\n
import java.io.IOException;\r\nimport javax.ws.rs.core.MediaType;\r\nimport javax.ws.rs.core.UriBuilder;\r\nimport org.apache.http.client.ClientProtocolException;\r\nimport com.sun.jersey.api.client.Client;\r\nimport com.sun.jersey.api.client.ClientResponse;\r\nimport com.sun.jersey.api.client.WebResource;\r\nimport com.sun.jersey.api.client.config.ClientConfig;\r\nimport com.sun.jersey.api.client.config.DefaultClientConfig;\r\nimport com.sun.jersey.api.representation.Form;\r\npublic class Test {\r\n public static void main(String[] args) throws ClientProtocolException, IOException {\r\n  ClientConfig config = new DefaultClientConfig();\r\n  Client client = Client.create(config);\r\n  WebResource service = client.resource(UriBuilder.fromUri('http:\/\/restUrl').build());\r\n  Form form = new Form();\r\n  form.add('name1', 'value1');\r\n  form.add('name2', 'value1');\r\n  ClientResponse response = service.path('restPath').path('resourcePath').\r\n  type(MediaType.APPLICATION_FORM_URLENCODED).post(ClientResponse.class, form);\r\n  System.out.println('Response ' + response.getEntity(String.class));\r\n }\r\n}\r\n<\/pre>\n
Happy coding and don’t forget to share!<\/p>\n
Reference: <\/i><\/strong>Simple REST client in java<\/a> from our JCG partner<\/a> Harsh Raval at the harryjoy<\/a> blog.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
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