// прочитать весь json в строку
private static String readAll() throws IOException {
StringBuilder data = new StringBuilder();
try {
HttpURLConnection con = (HttpURLConnection) ((new URL(PRODUCT_URL).openConnection()));
con.setRequestMethod("GET");
con.setDoInput(true);
String s;
try (BufferedReader in = new BufferedReader(new InputStreamReader(con.getInputStream()))) {
while ((s = in.readLine()) != null) {
data.append(s);
}
}
} catch (MalformedURLException e) {
e.printStackTrace();
throw new MalformedURLException("Url is not valid");
} catch (ProtocolException e) {
e.printStackTrace();
throw new ProtocolException("No such protocol, it must be POST,GET,PATCH,DELETE etc.");
} catch (IOException e) {
e.printStackTrace();
throw new IOException("cannot read from server");
}
return data.toString();
}
// добавить продукт в базу json server
public static void add(ProductREST product) throws NotValidProductException, IOException {
try {
check(product); // рповеряем продукт
// connection к серверу
HttpURLConnection con = (HttpURLConnection) ((new URL(PRODUCT_URL).openConnection()));
con.setRequestMethod("POST"); // метод post для добавления
// генерируем запрос
StringBuilder urlParameters = new StringBuilder();
urlParameters
.append("name=")
.append(URLEncoder.encode(product.getName(), "UTF8"))
.append("&");
urlParameters.append("price=").append(product.getPrice()).append("&");
urlParameters.append("weight=").append(product.getWeight()).append("&");
urlParameters
.append("manufacturer=")
.append(product.getManufacturer().getCountry())
.append("&");
urlParameters.append("category=").append(URLEncoder.encode(product.getCategory(), "UTF8"));
con.setDoOutput(true); // разрешаем отправку данных
// отправляем
try (DataOutputStream out = new DataOutputStream(con.getOutputStream())) {
out.writeBytes(urlParameters.toString());
}
// код ответа
int responseCode = con.getResponseCode();
System.out.println("\nSending 'POST' request to URL : " + PRODUCT_URL);
System.out.println("Response Code : " + responseCode);
} catch (NotValidProductException e) {
e.printStackTrace();
throw e;
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
throw new UnsupportedEncodingException("cannot recognize encoding");
} catch (ProtocolException e) {
e.printStackTrace();
throw new ProtocolException("No such protocol, protocol must be POST,DELETE,PATCH,GET etc.");
} catch (MalformedURLException e) {
e.printStackTrace();
throw new MalformedURLException("Url is not valid");
} catch (IOException e) {
e.printStackTrace();
throw new IOException("cannot write information to server");
}
}
public static String httpPost(String urlAddress, String[] params) {
URL url = null;
HttpURLConnection conn = null;
BufferedReader in = null;
StringBuffer sb = new StringBuffer();
try {
url = new URL(urlAddress);
conn = (HttpURLConnection) url.openConnection(); // 建立连接
// 设置通用的请求属性
/*
* conn.setRequestProperty("user-agent",
* "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
*/
conn.setRequestProperty("User-Agent", "Mozilla/5.0 ( compatible ) ");
conn.setRequestProperty("Accept", "*/*");
conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");
conn.setUseCaches(false);
conn.setDoInput(true);
// conn.setConnectTimeout(5 * 1000);
conn.setDoOutput(true);
conn.setRequestMethod("POST");
String paramsTemp = "";
for (String param : params) {
if (param != null && !"".equals(param)) {
if (params.length > 1) {
paramsTemp += "&" + param;
} else if (params.length == 1) {
paramsTemp = params[0];
}
}
}
byte[] b = paramsTemp.getBytes();
System.out.println("btye length:" + b.length);
// conn.setRequestProperty("Content-Length",
// String.valueOf(b.length));
conn.getOutputStream().write(b, 0, b.length);
conn.getOutputStream().flush();
conn.getOutputStream().close();
int count = conn.getResponseCode();
if (200 == count) {
in = new BufferedReader(new InputStreamReader(conn.getInputStream())); // 发送请求
} else {
System.out.println("错误类型：" + count);
return "server no start-up";
}
while (true) {
String line = in.readLine();
if (line == null) {
break;
} else {
sb.append(line);
}
}
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (ProtocolException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
System.out.println("error ioexception:" + e.getMessage());
e.printStackTrace();
return "server no start-up";
} finally {
try {
if (in != null) {
in.close();
}
if (conn != null) {
conn.disconnect();
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
return sb.toString();
}