The integrated guide of the HTTP client framework and Restful API in the Java class library
The integrated guide of the HTTP client framework and Restful API in the Java class library
In Java development, communicating with the server is a common demand, especially when building an application based on the RESTFUL architecture.In order to simplify the interaction with the server, the Java class library provides a variety of HTTP client frameworks. These frameworks can be integrated with the RESTFUL API to easily execute various HTTP requests and processing responses.
This guide will introduce how to use the HTTP client framework in the Java library to integrate with the RESTFUL API.We will first introduce some commonly used HTTP client frameworks, and then discuss in -depth HTTP requests such as how to use these frameworks to execute GET, Post, PUT, and Delete, as well as how to deal with server responses.
The choice of HTTP client framework is determined according to the needs of the project and personal preference.Here are some commonly used HTTP client frameworks:
1. Apache httpclient: Apache httpclient is a stable and powerful HTTP client framework. It provides simple APIs to perform various HTTP requests and processing responses.It supports connection pools and multi -threaded execution, and has support for various authentication methods.
2. OKHTTP: OKHTTP is a simple and efficient HTTP client framework, developed by Square.It provides smooth APIs to perform HTTP requests and processing responses.OKHTTP provides characteristics such as connection pool, GZIP compression and cache, and is compatible with the Java standard library.
3. HTTPURLCONNECTION: HTTPURLCONNECTION is a built -in HTTP client class in the Java standard library.It provides a basic API to perform HTTP requests and processing responses.Although it is not as rich as other frameworks, it is part of the Java standard library, so there is no need to introduce an external library.
Now, let's see how to use these HTTP client frameworks to perform common HTTP requests.
1. Send GET request:
Use Apache httpclient:
HttpClient httpClient = HttpClientBuilder.create().build();
HttpGet request = new HttpGet("https://api.example.com/resource");
HttpResponse response = httpClient.execute(request);
Use okhttp:
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url("https://api.example.com/resource")
.build();
Response response = client.newCall(request).execute();
Used httpurlconnection:
URL url = new URL("https://api.example.com/resource");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
2. Send post request:
Use Apache httpclient:
HttpClient httpClient = HttpClientBuilder.create().build();
HttpPost request = new HttpPost("https://api.example.com/resource");
StringEntity params = new StringEntity("param1=value1¶m2=value2");
request.addHeader("content-type", "application/x-www-form-urlencoded");
request.setEntity(params);
HttpResponse response = httpClient.execute(request);
Use okhttp:
OkHttpClient client = new OkHttpClient();
RequestBody formBody = new FormBody.Builder()
.add("param1", "value1")
.add("param2", "value2")
.build();
Request request = new Request.Builder()
.url("https://api.example.com/resource")
.post(formBody)
.build();
Response response = client.newCall(request).execute();
Used httpurlconnection:
URL url = new URL("https://api.example.com/resource");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream());
writer.write("param1=value1¶m2=value2");
writer.flush();
int responseCode = connection.getResponseCode();
3. Send the PUT request and delete request similar to the post request. Just change the request method as PUT or Delete.
The HTTP client framework in the integrated Java library is very simple and the RESTFUL API.According to project needs and personal preferences, choose the suitable HTTP client framework, and use its API to perform various HTTP requests and processing server responses.This will help you build a stable, efficient and easy -to be maintained RESTFUL -based application.
Please note that the code in the above examples is only used to explain the purpose, and you need to modify and expand it appropriately according to your own project needs.
Hope this guide can help you integrate the HTTP client framework and RESTFUL API in the Java class library.Wish you success when you build an application to communicate with the server!
references:
- Apache HttpClient: https://hc.apache.org/httpcomponents-client-ga/
- OkHttp: https://square.github.io/okhttp/
- HttpURLConnection: https://docs.oracle.com/en/java/javase/11/docs/api/java.net.http/java/net/HttpURLConnection.html
