public static String sendPost(String url, String param) {

PrintWriter out = null;

BufferedReader in = null;

String result = "";

try {

URL realUrl = new URL(url);

// 打开和URL之间的连接

URLConnection conn = realUrl.openConnection();

// 第二次发送post，设置cookie与第一次获取到的值相同

if (cookieStore != null) {

conn.setRequestProperty("Cookie", "JSESSIONID="

+ cookieStore.getCookies().get(0).getValue());

}

// 设置通用的请求属性

conn.setRequestProperty("accept", "*/*");

conn.setRequestProperty("connection", "Keep-Alive");

conn.setRequestProperty("user-agent",

"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");

// 发送POST请求必须设置如下两行

conn.setDoOutput(true);

conn.setDoInput(true);

// 获取URLConnection对象对应的输出流

out = new PrintWriter(conn.getOutputStream());

// 发送请求参数

out.print(param);

// flush输出流的缓冲

out.flush();

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(

new InputStreamReader(conn.getInputStream()));

// 第一次登陆，设置cookie

if (cookieStore == null) {

String cookieValue = conn.getHeaderField("Set-Cookie");

String sessionId = cookieValue.substring(0,

cookieValue.indexOf(";"));

// System.out.println("cookie value:" + sessionId);

cookieStore = new BasicCookieStore();

BasicClientCookie cookie = new BasicClientCookie("JSESSIONID",

sessionId.split("=")[1]);

cookie.setVersion(0);

cookie.setDomain("domain");

cookie.setPath("/xxx");

cookieStore.addCookie(cookie);

}

String line;

while ((line = in.readLine()) != null) {

result += line;

}

} catch (Exception e) {

System.out.println("发送 POST 请求出现异常！" + e);

}

// 使用finally块来关闭输出流、输入流

finally {

try {

if (out != null) {

out.close();

}

if (in != null) {

in.close();

}

} catch (IOException ex) {

System.out.println("发送 POST 请求出现异常！" + ex);

}

}

return result;

}