怎么使用java發(fā)送httpget請(qǐng)求

使用Java發(fā)送HttpGet請(qǐng)求的步驟如下：

1. 導(dǎo)入所需的類：

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;

2. 創(chuàng)建URL對(duì)象，指定要發(fā)送請(qǐng)求的URL：

URL url = new URL("http://example.com");

3. 打開連接并創(chuàng)建HttpURLConnection對(duì)象：

HttpURLConnection connection = (HttpURLConnection) url.openConnection();

4. 設(shè)置請(qǐng)求方法為GET：

connection.setRequestMethod("GET");

5. 獲取響應(yīng)碼：

int responseCode = connection.getResponseCode();

6. 根據(jù)響應(yīng)碼判斷請(qǐng)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();
// 處理響應(yīng)數(shù)據(jù)
System.out.println(response.toString());
} else {
System.out.println("請(qǐng)求失敗");
}

7. 關(guān)閉連接：

connection.disconnect();

完整的示例代碼如下：

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("請(qǐng)求失敗");
}
connection.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
}

注意：上述示例代碼中的URL為示例URL，實(shí)際使用時(shí)需要替換為你要發(fā)送請(qǐng)求的URL。