android19

【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 = "http://192.168.17.9:8080/and/listservlet";
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);
}

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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("http://192.168.17.9:8080/and/listservlet");
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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