The best practice of the Play WS framework in the Java class library
The best practice of the Play WS framework in the Java class library
The Play WS framework is a library commonly used in the Java library to process HTTP requests and responses.When developing web applications, we often need to communicate with other services, such as calling REST API to obtain data or interacting with external systems.The Play WS framework provides easy -to -use tools to help us easily handle these requests and responses.
In this article, we will provide some best practices of some Play WS frameworks to help you better use the framework.
1. Add Play WS dependence
First, we need to add Play WS dependencies to the project construction file (such as Maven or Gradle).According to the different construction tools you use, you can add dependencies to pom.xml (for maven) or Build.gradle files (for Gradle) files:
Maven:
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-actor_2.13</artifactId>
<version>2.6.14</version>
</dependency>
<dependency>
<groupId>com.typesafe.play</groupId>
<artifactId>play-ws_2.13</artifactId>
<version>2.9.1</version>
</dependency>
Gradle:
groovy
implementation 'com.typesafe.akka:akka-actor_2.13:2.6.14'
implementation 'com.typesafe.play:play-ws_2.13:2.9.1'
2. Create Play WS client
Before using the Play WS framework, we need to create a Play WS client first.You can create a WSClient instance by using Java's dependent injection (Dependency Injection) framework, such as Google Guice or Spring.Usually, we will inject WSClient instances into the class we need to use Play WS for HTTP requests.
In the following code, we demonstrated how to use Google Guice to create a WSClient instance:
import com.google.inject.Inject;
import play.libs.ws.WSClient;
public class MyService {
private final WSClient wsClient;
@Inject
public MyService(WSClient wsClient) {
this.wsClient = wsClient;
}
// Other methods...
public void makeRequest() {
// Use WSclient for HTTP request
}
}
3. Initiating HTTP request
It is very simple to use the Play WS framework for HTTP request.We only need to use the WSclient instance to call the corresponding method and pass the request URL and other related information.Here are some commonly used HTTP request examples:
-Entreate a GET request:
wsClient.url("https://api.example.com/users").get();
-The POST request:
wsClient.url("https://api.example.com/users")
.setContentType("application/json")
.post(jsonData);
-E initiating PUT request:
wsClient.url("https://api.example.com/users/1")
.setContentType("application/json")
.put(jsonData);
-Entreate the delete request:
wsClient.url("https://api.example.com/users/1").delete();
4. Processing HTTP response
After getting HTTP response, we need to process the returned data.Play WS framework uses Java CompletableFuture to deal with asynchronous response.Here are some examples of processing HTTP response:
-This JSON response:
import play.libs.ws.JsonBodyReadables;
import play.libs.ws.JsonBodyWritables;
import play.libs.ws.WSResponse;
public void makeRequest() {
CompletableFuture<WSResponse> responseFuture = wsClient.url("https://api.example.com/users").get();
responseFuture.thenAccept(response -> {
if (response.getStatus() == 200) {
JsonNode json = response.as(JsonNode.class);
// Here
} else {
// Processing other status codes
}
});
}
-This text response:
import play.libs.ws.WSResponse;
public void makeRequest() {
CompletableFuture<WSResponse> responseFuture = wsClient.url("https://api.example.com/users").get();
responseFuture.thenAccept(response -> {
if (response.getStatus() == 200) {
String body = response.getBody();
// Here
} else {
// Processing other status codes
}
});
}
The above are the best practice to use the Play WS framework.At the same time, we can also configure other settings according to specific needs, such as timeout time, connection pool size, and request header.
I hope that through this article, you can better understand how to use the Play WS framework and apply these best practices in development.Let us be able to handle HTTP requests and responses more efficiently.
