java怎么获取response返回内容

在Java中，可以使用HttpURLConnection或HttpClient来获取HTTP响应的内容。
使用HTTPURLConnection的示例代码如下：
```java
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL;
public class Main {
public static void main(String[] args) {
try {
URL url = new URL("http://example.com");
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
// 设置请求方法为GET
connection.setRequestMethod("GET");
int responseCode = connection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK) {
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.toString());
} else {
System.out.println("HTTP request failed. Response Code: " + responseCode);
}
connection.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
}
}
```
使用HttpClient的示例代码如下：
```java
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
public class Main {
public static void main(String[] args) {
HttpClient httpClient = new DefaultHttpClient();
try {
HttpGet httpGet = new HttpGet("http://example.com");
HttpResponse response = httpClient.execute(httpGet);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode == 200) {
HttpEntity entity = response.getEntity();
String responseString = EntityUtils.toString(entity);
System.out.println(responseString);
} else {
System.out.println("HTTP request failed. Response Code: " + statusCode);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
httpClient.getConnectionManager().shutdown();
}
}
}
```
这些代码示例使用HTTP GET请求来获取响应的内容，并将其打印到控制台。你可以根据实际需要进行修改和适配。