Use the Play WS framework to implement network requests in the Java library
Use the Play WS framework to implement network requests in the Java library
Introduction:
When implementing network requests in the Java class library, you can use the Play WS framework to simplify this process.Play WS is part of the Play framework, which provides a powerful API for HTTP requests.
step:
The following is the step of using the Play WS framework to implement network requests in the Java library:
1. Add dependencies:
First of all, you need to add the dependencies of the PLAY WS framework to the construction file of the project.If you use maven for construction, you can add the following dependencies to the pom.xml file:
<dependency>
<groupId>com.typesafe.play</groupId>
<artifactId>play-ws_2.12</artifactId>
<version>2.9.1</version>
</dependency>
If constructed with Gradle, you can add the following dependencies to the built.gradle file:
groovy
implementation 'com.typesafe.play:play-ws_2.12:2.9.1'
2. Create WSClient:
Before realizing network requests in the Java class library, a WSClient object needs to be created.You can use some methods provided by the WSclient class to create WSClient objects.
import play.libs.ws.*;
import com.google.inject.Inject;
public class MyClient {
private final WSClient ws;
@Inject
public MyClient(WSClient ws) {
this.ws = ws;
}
public void makeRequest() {
// Here
}
}
3. Send a request:
Now, you can use the WSClient object to send a network request.You can use Get, POST and other methods to send different types of requests and process the response of requests.
The following is an example. Send a get request:
public void makeRequest() {
ws.url("https://api.example.com/data")
.get()
.thenAccept(response -> {
// Treatment response
System.out.println(response.getBody());
});
}
4. Processing response:
After sending a request, the asynchronous mechanism can be used to deal with the response.You can use methods such as thenAccept (), thenApply () to process the response of the request.
For example, the result can be written to the file after the response returns:
public void makeRequest() {
ws.url("https://api.example.com/data")
.get()
.thenApply(response -> {
// Treatment response
File file = new File("response.txt");
try (PrintWriter writer = new PrintWriter(file)) {
writer.print(response.getBody());
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return file;
});
}
5. Clean up resources:
Finally, it should be closed when the WSClient object is not required to release the resource.You can call the close () method of the WSClient object when the application is closed to close it.
public void shutdown() {
ws.close();
}
Configuration:
The Play WS framework provides some configurable options, which can be customized as needed.
You can configure some options of WSClient in the Application.conf file, such as connecting timeout time, tracking logs, etc.
conf
play.ws.timeout.connection = 5000ms
play.ws.timeout.idle = 5000ms
play.ws.log.level = BODY
These options can be adjusted according to specific needs to meet the requirements of the project.
Summarize:
Through the Play WS framework, we can easily implement network requests in the Java class library.Follow the above steps, you can create the WSClient object and send a request, and then process the response.You can also configure the option of WSClient as needed to define network requests.This makes network requests more simple and flexible in Java applications.
