使用HttpURLConnection发请求获取数据
参考代码:
import java.io.BufferedReader; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStream; import java.net.HttpURLConnection; import java.net.URL; /** * 功能说明:HttpClient - 通过发送Http请求获取目标URL的数据 */ public class HttpClient { /** 提交方式POST **/ public static final String SUBMIT_METHOD_POST = "POST"; /** 提交方式GET **/ public static final String SUBMIT_METHOD_GET = "GET"; /** * 通过http请求获取数据 * @param urlStr url地址,如:www.baidu.com * @param param url的?后的参数,如:www.baidu.com?a=1&&b=2,则param为"a=1&&b=2" * @return 返回读取到的数据(json字符串) */ public static String pub(String urlStr,String param,String method) { URL url = null; HttpURLConnection connection = null; StringBuffer buffer = new StringBuffer(); System.out.println("request:"+urlStr+"?"+param); try { /*建立连接*/ url = new URL(urlStr); connection = (HttpURLConnection) url.openConnection(); /*设置连接属性 */ connection.setDoOutput(true);// 使用 URL 连接进行输出 connection.setDoInput(true);// 使用 URL 连接进行输入 connection.setUseCaches(false);// 忽略缓存 connection.setRequestMethod(method);// 设置URL请求方法 /*设置请求属性*/ connection.setRequestProperty("Content-Length",param.length()+""); connection.setRequestProperty("Content-Type", "application/octet-stream"); connection.setRequestProperty("Connection", "Keep-Alive");// 维持长连接 connection.setRequestProperty("Charset", "UTF-8");// 设置编码 /*建立输出流,并写入数据*/ OutputStream outputStream = connection.getOutputStream(); outputStream.write(param.getBytes("UTF-8")); /*读取数据*/ BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8")); String line = ""; while ((line = reader.readLine()) != null) { buffer.append(line); } reader.close(); } catch (IOException e) { e.printStackTrace(); } finally { if (connection != null) { connection.disconnect(); } } System.out.println("response:"+buffer.toString()); return buffer.toString(); } /*测试*/ public static void main(String[] args) { pub("http://f.apiplus.cn/ssq.json", "a=1",SUBMIT_METHOD_POST); } }
测试结果:
参考:
Java中使用HttpURLConnection发起POST请求