java如何实现http 请求GET和POST数据发送响应请求

更新时间：2023-12-29 20:22:18 作者：肥宅-季波我要评论(0)

在Java中，您可以使用java.net.HttpURLConnection或org.apache.http.client.HttpClient等类来进行HTTP请求。以下是使用HttpURLConnection类发送GET和POST请求的示例代码：

发送GET请求：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpGetRequestExample {
public static void main(String[] args) {
try {
String url = "https://api.example.com/get-data";
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) { // 请求成功
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
StringBuilder response = new StringBuilder();
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
System.out.println("Response: " + response.toString());
} else {
System.out.println("GET request failed. Response Code: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

发送POST请求：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpPostRequestExample {
public static void main(String[] args) {
try {
String url = "https://api.example.com/submit-data";
String postData = "name=John&age=30"; // POST请求的数据
HttpURLConnection connection = (HttpURLConnection) new URL(url).openConnection();
connection.setRequestMethod("POST");
connection.setDoOutput(true);
connection.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
OutputStream outputStream = connection.getOutputStream();
outputStream.write(postData.getBytes());
outputStream.flush();
outputStream.close();
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) { // 请求成功
BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String line;
StringBuilder response = new StringBuilder();
while ((line = reader.readLine()) != null) {
response.append(line);
}
reader.close();
System.out.println("Response: " + response.toString());
} else {
System.out.println("POST request failed. Response Code: " + responseCode);
}
} catch (Exception e) {
e.printStackTrace();
}
}
}

在上述示例中，我们使用HttpURLConnection类来发送HTTP请求。对于GET请求，我们设置请求方法为"GET"，并使用getInputStream()方法来获取响应数据。对于POST请求，我们除了设置请求方法为"OST"外，还设置了是否输出请求数据，并将POST数据写入输出流。然后，我们使用getInputStream()方法来获取响应数据。