android下联网
/** * HTTP请求 * @author hsz * */ public class HttpRequest { /** * 通过URL和URLConnection get方式提交参数给服务器 * @param path * @param params * @param enc * @return * @throws Exception */ private static boolean sendGETRequest (String path, Map<String, String> params) throws Exception{ //发送地http://192.168.100.91:8080/videoService ///login?username=abc&password=123 // StringBuilder是用来组拼请求地址和参数 StringBuilder sb = new StringBuilder(); sb.append(path).append("?"); if(params!=null &¶ms.size()!=0){ for (Map.Entry<String, String> entry : params.entrySet()) {//如果请求参数中有中文，需要进行URLEncoder编码 sb.append(entry.getKey()).append("=") .append(URLEncoder.encode(entry.getValue(), "utf-8")); sb.append("&"); } sb.deleteCharAt(sb.length()-1); } URL url = new URL(sb.toString()); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setRequestMethod("GET"); if(conn.getResponseCode()==200){ return true; } return false; } /** *我们先从IE浏览器中使用POST方法发送一次：（下面内容可以用HttpWatch看到） *POST /videoService/login HTTP/1.1 *Accept: image/jpeg, application/x-ms-application, image/gif, application/xaml+xml, image/pjpeg, *application/x-ms-xbap, application/vnd.ms-excel, application/vnd.ms-powerpoint, *application/msword, application/QVOD, application/QVOD, *Referer: http://192.168.100.91:8080/videoService/login.jsp*Accept-Language: zh-CN,en;q=0.5*User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; GTB6.5; SLCC2; .NET CLR 2.0.50727; *.NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0)*Content-Type: application/x-www-form-urlencoded//POST请求这个一定要设置*Accept-Encoding: gzip, deflate*Host: 192.168.100.91:8080*Content-Length: 26//还有发送内容长度也要设置*Connection: Keep-Alive*Cache-Control: no-cache*Cookie: JSESSIONID=7E1435CB8A071D07A430453250348C41*username=asd&password=1234//这里是请求体部分，一共26个字节，与Content-Length长度一样*//** * 通过URL和URLConnection post方式提交参数给服务器 * @param path * @param params * @param enc * @return * @throws Exception */ private static boolean sendPOSTRequest(String path,Map<String, String> params) throws Exception{// StringBuilder是用来组拼请求参数 StringBuilder sb = new StringBuilder(); if(params!=null &¶ms.size()!=0){ for (Map.Entry<String, String> entry : params.entrySet()) { sb.append(entry.getKey()).append("=") .append(URLEncoder.encode(entry.getValue(), "utf-8")); sb.append("&"); } sb.deleteCharAt(sb.length()-1); }// entity为请求体部分内容//如果有中文则以UTF-8编码为username=%E4%B8%AD%E5%9B%BD&password=123 byte[] entity = sb.toString().getBytes(); URL url = new URL(path); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setConnectTimeout(5000); conn.setRequestMethod("POST");//要向外输出数据，要设置这个 conn.setDoOutput(true); //内容类型Content-Type: application/x-www-form-urlencoded //内容长度Content-Length: conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded"); conn.setRequestProperty("Content-Length", entity.length+""); OutputStream os = conn.getOutputStream();//以POST方式发送请求体,这时才真正开始联网 os.write(entity); if(conn.getResponseCode()==200){ return true; } return false; }/** *在遇上HTTPS安全模式或者操作cookie的时候使用HTTPclient会方便很多,也是android内部集成的 * 使用HTTPClient（开源项目）向服务器提交参数 */private static boolean sendPOSTRequestHttpClient(String path,Map<String, String> params) throws Exception{ //封装请求参数 List<NameValuePair> pair = new ArrayList<NameValuePair>(); if(params!=null&& !params.isEmpty()){ for(Map.Entry<String, String> entry:params.entrySet()){ pair.add(new BasicNameValuePair(entry.getKey(), entry.getValue())); } } //把请求参数变成请求体部分 UrlEncodedFormEntity uee = new UrlEncodedFormEntity(pair, "utf-8"); //使用HttpPost对象设置发送的URL路径 HttpPost post = new HttpPost(path); //发送请求体 post.setEntity(uee); //创建一个浏览器对象，以把POST对象向服务器发送，并返回响应消息 DefaultHttpClient dhc = new DefaultHttpClient(); //执行post请求 HttpResponse response = dhc.execute(post); if(response.getStatusLine().getStatusCode()==200){ Log.i("http", "httpclient"); //获取返回实体 HttpEntity httpEntity = response.getEntity(); return true; } return false; }}