java 通过http方式获取返回的数据

/**

* 通过http方式获取返回的数据

*

* @param url

* 请求地址

* @param requestData

* 请求数据

* @param charset

* 字符集编码

* @return

* @throws Exception

*/

public static String post(String urlStr, String requestData, String charset)

throws Exception {

URL url = null;

HttpURLConnection conn = null;

ByteArrayOutputStream byteArray = null;

String temp;

try {

url = new URL(urlStr);

conn = (HttpURLConnection) url.openConnection(); // 打开，创建Connection对象

conn.setRequestMethod("POST"); // 设定请求方式为POST

conn.setDoOutput(true); // 一定要设为true,因为要发送数据

// 下面开始设定Http头

// conn.setRequestProperty("Content-Type",

// "multipart/form-data; boundary=Bounday---");

conn.setRequestProperty("Content-Type", "text/xml;charset=utf-8");

conn.setRequestProperty("Cache-Control", "no-cache");

conn.setRequestProperty("Connection", "close");

conn.setConnectTimeout(60000);

// 传送送据

OutputStream buf = conn.getOutputStream();

buf = new BufferedOutputStream(buf);

OutputStreamWriter out = new OutputStreamWriter(buf);

out.write(requestData);

out.flush(); // 这个一定要,清空缓存，发送数据

out.close();

// 接收数据

InputStream in = conn.getInputStream();

byteArray = new ByteArrayOutputStream(in.available());

byte[] b = new byte[8192];

int len = -1;

while ((len = in.read(b)) != -1) {

byteArray.write(b, 0, len);

}

in.close();

temp = byteArray.toString(charset);

} catch (Exception e) {

throw e;

} finally {

if (conn != null) {

conn.disconnect();

}

}

return temp;

}