android端向服务器提交请求的几种方式

1、GET方式

其实GET方式说白了，就是拼接字符串。。最后拼成的字符串的格式是： path ? username= ....& password= ......

public boolean loginByGet(String path, String username , String password) throws Exception{String url_path = path +"?username=" + URLEncoder.encode(username, "utf-8") + "&password="+password;URL url = new URL(url_path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("GET");conn.setConnectTimeout(5000);if(conn.getResponseCode() == 200){return true;}return false;}

2、POST方式

post方式中，一定要设置以下两个请求参数

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

完整代码如下：

public boolean loginByPost(String path,String username , String password) throws Exception{System.out.println("LoginService的loginByPost()");URL url = new URL(path);HttpURLConnection conn = (HttpURLConnection) url.openConnection();conn.setRequestMethod("POST");conn.setConnectTimeout(5000);String value = "username=" + username +"&" + "password=" +password;        byte[] entity = value.getBytes(); conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");conn.setRequestProperty("Content-Length", entity.length + "");conn.setDoOutput(true);OutputStream os = conn.getOutputStream();os.write(entity);if(conn.getResponseCode() == 200){return true;}return false;}

3、通过HttpClient以GET方式提交请求

使用HttpClient这个第三方框架以后，我们在编写代码的时候就看不到URL、conn之类的。他其实就是对Http协议进行了封装

public boolean loginByHttpClientGet(String path,String username , String password) throws Exception{String value = path + "?username=" + username +"&password=" + password; HttpClient httpClient =  new DefaultHttpClient();HttpGet httpGet = new HttpGet(value);HttpResponse httpResponse = httpClient.execute(httpGet);    if(httpResponse.getStatusLine().getStatusCode() == 200){    return true;    }        return false;}

4、通过HttpClient以POST方式提交请求

public boolean loginByHttpClientPost(String path,String username , String password)throws Exception{HttpClient httpClient = new DefaultHttpClient();HttpPost httpPost = new HttpPost(path);List<NameValuePair> parameters = new ArrayList<NameValuePair>();parameters.add(new BasicNameValuePair("username", username));parameters.add(new BasicNameValuePair("password", password));UrlEncodedFormEntity entity = new UrlEncodedFormEntity(parameters,"utf-8");httpPost.setEntity(entity);HttpResponse httpResponse = httpClient.execute(httpPost);    if(httpResponse.getStatusLine().getStatusCode() == 200){    return true;    }        return false;}

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