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HttpURLConnection或第三方库如Apache HttpClient。以下是使用HttpURLConnection的示例:,,“java,import java.io.BufferedReader;,import java.io.InputStreamReader;,import java.net.HttpURLConnection;,import java.net.URL;,,public class JavaCallPhp {, public static void main(String[] args) {, try {, URL url = new URL("http://example.com/php_api.php");, HttpURLConnection conn = (HttpURLConnection) url.openConnection();, conn.setRequestMethod("GET");, conn.setConnectTimeout(5000);, conn.setReadTimeout(5000);,, if (conn.getResponseCode() == 200) {, BufferedReader reader = new BufferedReader(new InputStreamReader(conn.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("请求失败,响应码:" + conn.getResponseCode());, }, conn.disconnect();, } catch (Exception e) {, e.printStackTrace();, }, },},`,,将http://example.com/php_api.php`替换为你的PHP接口地址。在Java中调用PHP接口,通常有两种方式:使用HttpURLConnection或者使用HttpClient,以下是详细的步骤和示例代码:

1、使用HttpURLConnection
步骤:
创建一个URL对象,传入PHP接口的URL。
打开这个URL的连接,得到一个HttpURLConnection对象。
设置请求方法(GET或POST)。
获取输入流,读取返回的数据。
关闭连接。
示例代码:
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) throws Exception {
String url = "http://example.com/api.php";
URL obj = new URL(url);
HttpURLConnection con = (HttpURLConnection) obj.openConnection();
con.setRequestMethod("GET");
BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()));
String inputLine;
StringBuffer response = new StringBuffer();
while ((inputLine = in.readLine()) != null) {
response.append(inputLine);
}
in.close();
System.out.println(response.toString());
}
}
2、使用HttpClient
步骤:
创建一个CloseableHttpClient对象。
创建一个HttpGet或HttpPost对象,传入PHP接口的URL。
执行请求,得到一个CloseableHttpResponse对象。
获取响应体,转换为字符串。
关闭连接。
示例代码:
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class Main {
public static void main(String[] args) throws Exception {
CloseableHttpClient httpclient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://example.com/api.php");
CloseableHttpResponse response = httpclient.execute(httpGet);
try {
System.out.println(EntityUtils.toString(response.getEntity()));
} finally {
response.close();
}
}
}
相关问题与解答:
1、Q: 如何在Java中处理PHP接口返回的JSON数据?
A: 可以使用org.json库来解析JSON数据,如果PHP接口返回的是{"key":"value"}这样的JSON字符串,可以使用JSONObject json = new JSONObject(response.toString());来解析,然后通过json.getString("key")来获取值。
2、Q: 如何在Java中发送POST请求到PHP接口?
A: 无论是使用HttpURLConnection还是HttpClient,都可以发送POST请求,对于HttpURLConnection,需要设置请求方法为"POST",然后写入请求体;对于HttpClient,需要创建一个HttpPost对象,然后写入请求体。