cep.java

public String httpPost(String urlStr) throws IOException{
		URL url = new URL(urlStr);
		HttpURLConnection conn = (HttpURLConnection) url.openConnection();
		
		if (conn.getResponseCode() != 200){
			throw new IOException(conn.getContentEncoding());
		}
		
		BufferedReader rd = new BufferedReader(new InputStreamReader(conn.getInputStream()));
		StringBuilder sb = new StringBuilder();
		String line;
		
		while ((line = rd.readLine()) != null){
			sb.append(line);
		}
		
		rd.close();
		
		conn.disconnect();
		return sb.toString();
	}
	
	public String getEndereco(String cep) {
		Endereco endereco = new Endereco();
		try {
			String result = httpGet("http://correiosapi.apphb.com/cep/"+cep);
			JSONObject obj = new JSONObject(result);
			endereco = new Endereco(
					Integer.parseInt(obj.getString("cep")),
					obj.getString("tipoDeLogradouro"),
					obj.getString("logradouro"),
					obj.getString("bairro"),
					obj.getString("cidade"),
					obj.getString("estado"));
		} catch (IOException e) {
			e.printStackTrace();
		} catch (Exception e) {
			e.printStackTrace();
		}
		return endereco.getCidade();
	}