android笔记之--向网络发送GET/POST请求参数

使用GET方法发送请求

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; }

使用POST方法发送请求

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

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); 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 os.write(entity); if(conn.getResponseCode()==200){ return true; } return false; }

以Android集成的HttpClient框架来发送

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(); HttpResponse response = dhc.execute(post); if(response.getStatusLine().getStatusCode()==200){ Log.i("http", "httpclient"); return true; } return false; }