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;
	}