JAVA怎么调用接口？

String sendPost(String jsonStr, String path)
throws IOException {
byte[] data = jsonStr.getBytes();
java.net.URL url = new java.net.URL(path);
java.net.HttpURLConnection conn =
(java.net.HttpURLConnection) url.openConnection();
conn.setRequestMethod("POST");
conn.setConnectTimeout(5 * 1000);// 设置连接超时时间为5秒
conn.setReadTimeout(20 * 1000);// 设置读取超时时间为20秒
// 使用 URL 连接进行输出，则将 DoOutput标志设置为 true
conn.setDoOutput(true);

conn.setRequestProperty("Content-Type", "text/xml;charset=UTF-8");
//conn.setRequestProperty("Content-Encoding","gzip");
conn.setRequestProperty("Content-Length", String.valueOf(data.length));
OutputStream outStream = conn.getOutputStream();// 返回写入到此连接的输出流
outStream.write(data);
outStream.close();//关闭流
String msg = "";// 保存调用http服务后的响应信息
// 如果请求响应码是200，则表示成功
if (conn.getResponseCode() == 200) {
// HTTP服务端返回的编码是UTF-8,故必须设置为UTF-8,保持编码统一,否则会出现中文乱码
BufferedReader in = new BufferedReader(new InputStreamReader(
(InputStream) conn.getInputStream(), "UTF-8"));
msg = in.readLine();
in.close();
}
conn.disconnect();// 断开连接
return msg;
}

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