java调用http接口get请求

可以使用Java中的HttpURLConnection或者HttpClient库来发送GET请求，具体实现可以参考以下代码：

使用HttpURLConnection：

URL url = new URL("http://example.com/api");
HttpURLConnection con = (HttpURLConnection) url.openConnection();
con.setRequestMethod("GET");

int responseCode = con.getResponseCode();
System.out.println("Response Code : " + responseCode);

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());

使用HttpClient：

CloseableHttpClient httpClient = HttpClients.createDefault();
HttpGet httpGet = new HttpGet("http://example.com/api");

CloseableHttpResponse response = httpClient.execute(httpGet);
System.out.println("Response Code : " + response.getStatusLine().getStatusCode());

HttpEntity entity = response.getEntity();
String responseString = EntityUtils.toString(entity, "UTF-8");
System.out.println(responseString);

response.close();
httpClient.close();