117笔记问答使用Java发送HttpGet请求的步骤如下：
- 导入所需的类：
import java.io.BufferedReader; import java.io.InputStreamReader; import java.net.HttpURLConnection; import java.net.URL;
- 创建URL对象，指定要发送请求的URL：
URL url = new URL("http://example.com");
- 打开连接并创建HttpURLConnection对象：
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
- 设置请求方法为GET：
connection.setRequestMethod("GET");
- 获取响应码：
int responseCode = connection.getResponseCode();
- 根据响应码判断请求是否成功：
if (responseCode == HttpURLConnection.HTTP_OK) {
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String inputLine;
StringBuilder response = new StringBuilder();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
// 处理响应数据
System.out.println(response.toString());
} else {
System.out.println("请求失败");
}
- 关闭连接：
connection.disconnect();
完整的示例代码如下：
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class HttpGetExample {
public static void main(String[] args) {
try {
URL url = new URL("http://example.com");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
String inputLine;
StringBuilder response = new StringBuilder();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
System.out.println(response.toString());
} else {
System.out.println("请求失败");
}
connection.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
}
注意：上述示例代码中的URL为示例URL，实际使用时需要替换为你要发送请求的URL。