The common problems and solutions of the HTTP client using the JAVA library to implement the HTTP client
Question 1: How to send HTTP get requests and get response?
Solution: Using Jetty can easily send HTTP GET requests and get response.The following is an example code:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.util.StringContentProvider;
import org.eclipse.jetty.http.HttpMethod;
public class HttpClientExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
ContentResponse response = httpClient.newRequest("http://api.example.com/")
.method(HttpMethod.GET)
.send();
// Get the response content
String responseBody = response.getContentAsString();
// Treatment response
System.out.println(responseBody);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Question 2: How to send HTTP Post requests and get response?
Solution: Jetty can easily send HTTP Post requests and deal with response.The following is an example code:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.util.StringContentProvider;
import org.eclipse.jetty.http.HttpMethod;
public class HttpClientExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
// Create the http post request and set the request body content
StringContentProvider contentProvider = new StringContentProvider("Request Payload");
ContentResponse response = httpClient.newRequest("http://api.example.com/")
.method(HttpMethod.POST)
.content(contentProvider, "application/json")
.send();
// Get the response content
String responseBody = response.getContentAsString();
// Treatment response
System.out.println(responseBody);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Question 3: How to deal with the status code of HTTP response?
Solution: Using Jetty, you can easily obtain the status code of HTTP response.The following is an example code:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.util.StringContentProvider;
import org.eclipse.jetty.http.HttpMethod;
public class HttpClientExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
ContentResponse response = httpClient.newRequest("http://api.example.com/")
.method(HttpMethod.GET)
.send();
// Get the status code for HTTP response
int statusCode = response.getStatus();
// Check the status code and process the response
if (statusCode == 200) {
String responseBody = response.getContentAsString();
System.out.println(responseBody);
} else {
System.out.println ("The request failed, the status code was:" + Statuscode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Question 4: How to deal with HTTP request timeout?
Solution: Jetty allows us to set the request timeout.The following is an example code:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.util.StringContentProvider;
import org.eclipse.jetty.http.HttpMethod;
public class HttpClientExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
ContentResponse response = httpClient.newRequest("http://api.example.com/")
.method(HttpMethod.GET)
.timeout (5000) // Set the request timeout time of 5000 milliseconds
.send();
// Treatment response
String responseBody = response.getContentAsString();
System.out.println(responseBody);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Question 5: How to deal with HTTP request redirect?
Solution: Jetty can automatically handle HTTP request redirect.The following is an example code:
import org.eclipse.jetty.client.HttpClient;
import org.eclipse.jetty.client.api.ContentResponse;
import org.eclipse.jetty.client.util.StringContentProvider;
import org.eclipse.jetty.http.HttpMethod;
public class HttpClientExample {
public static void main(String[] args) {
HttpClient httpClient = new HttpClient();
try {
httpClient.start();
ContentResponse response = httpClient.newRequest("http://api.example.com/")
.method(HttpMethod.GET)
.followRedirects (true) // Allow redirect direction
.send();
// Treatment response
String responseBody = response.getContentAsString();
System.out.println(responseBody);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
httpClient.stop();
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
Jetty is a powerful and easy -to -use HTTP client library that is very practical when implementing the HTTP client in the Java class library.Using these common problems and solutions, you can easily use Jetty to send HTTP requests and deal with response.
