如何使用java发送httpget要求

使用Java发送HttpGet要求的步骤以下：
1. 导入所需的类：
```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
```
2. 创建URL对象，指定要发送要求的URL：
```java
URL url = new URL("http://example.com");
```
3. 打开连接并创建HttpURLConnection对象：
```java
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
```
4. 设置要求方法为GET：
```java
connection.setRequestMethod("GET");
```
5. 获得响应码：
```java
int responseCode = connection.getResponseCode();
```
6. 根据响应码判断要求是否是成功：
```java
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("要求失败");
}
```
7. 关闭连接：
```java
connection.disconnect();
```
完全的示例代码以下：
```java
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("要求失败");
}
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要求的URL。