【向Internet发送请求参数】

利用HttpURLConnection对象,我们可以向网络发送请求参数.

String requestUrl = "";

Map<String, String> requestParams = new HashMap<String, String>();

requestParams.put("age", "12");

requestParams.put("name", "中国");

 StringBuilder params = new StringBuilder();

for(Map.Entry<String, String> entry : requestParams.entrySet()){

 params.append(entry.getKey());

 params.append("=");

 params.append(URLEncoder.encode(entry.getValue(), "UTF-8"));

 params.append("&");

}

if (params.length() > 0) params.deleteCharAt(params.length() - 1);

byte[] data = params.toString().getBytes();

URL realUrl = new URL(requestUrl);

HttpURLConnection conn = (HttpURLConnection) realUrl.openConnection();

conn.setDoOutput(true);//发送POST请求必须设置允许输出

conn.setUseCaches(false);//不使用Cache

conn.setRequestMethod("POST");        

conn.setRequestProperty("Content-Length", String.valueOf(data.length));

conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");

DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());

outStream.write(data);

outStream.flush();

if( conn.getResponseCode() == 200 ){

        String result = readAsString(conn.getInputStream(), "UTF-8");

        outStream.close();

        System.out.println(result);

}

//---------------------------

利用HttpURLConnection对象,我们可以向网络发送xml数据.

StringBuilder xml =  new StringBuilder();

xml.append("<?xml version=\"1.0\" encoding=\"utf-8\" ?>");

xml.append("<M1 V=10000>");

xml.append("<U I=1 D=\"N73\">中国</U>");

xml.append("</M1>");

byte[] xmlbyte = xml.toString().getBytes("UTF-8");

URL url = new URL("");

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setConnectTimeout(5* 1000);

conn.setDoOutput(true);//允许输出

conn.setUseCaches(false);//不使用Cache

conn.setRequestMethod("POST");        

conn.setRequestProperty("Content-Length", String.valueOf(xmlbyte.length));

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

DataOutputStream outStream = new DataOutputStream(conn.getOutputStream());

outStream.write(xmlbyte);//发送xml数据

outStream.flush();

if (conn.getResponseCode() != 200) throw new RuntimeException("请求url失败");

InputStream is = conn.getInputStream();//获取返回数据

String result = readAsString(is, "UTF-8");

outStream.close(); 

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