[英]How to tell if return is JSONObject or JSONArray with JSON-simple (Java)?
[英]Create a JSONObject in a JSONArray (JSON-Simple / JAVA)
因此,在JSONArray中添加新的JSONObject時會遇到很多麻煩。
我的代碼是西班牙語,所以我會盡力將注釋中的變量和方法翻譯成英文。
這是我的.JSON(默認用戶的所有屬性都為“ admin”):
{"Usuarios":[{"nombre":"Admin","apellido":"Admin","direccion":"Admin","telefono":"Admin","correo":"Admin@admin.com","username":"admin","password":"admin"}]}
首先,我創建了函數,這些函數可以毫無問題地驗證用戶“ admin”的屬性。 因此,在讀取JSON文件(僅在其上寫入)時,它們並不是問題:
所以這是這個功能的問題:
public void agregarUsuario(String nombre, String apellido, String direccion, String telefono, String correo, String username, String password) //this function add a new user object to my array in the json
{
try {
JSONObject usuarios = getJSONObjectFromFile("/usuarios.json"); //Json object "usuarios"/"users" is my main json obj file
JSONArray listaUsuario = usuarios.getJSONArray("Usuarios"); //I've start my array "Usuarios" (who is in my .json)
JSONObject newObject = new JSONObject(); //I created a new JSONObjectVariable, with the attributes i want in it
newObject.put("nombre", nombre);
newObject.put("apellido", apellido);
newObject.put("direccion", direccion);
newObject.put("telefono", telefono);
newObject.put("correo", correo);
newObject.put("username",username);
newObject.put("password", password);
//at this point my new object has all the attributes i want to put in my array
listaUsuario.put(newObject); //so here i tried to put in my array my new Json object
usuarios.put("Usuarios",listaUsuario); //this line, is one of my attempts to figure out how to put the function working
//it wasn't in the first time, but how listaUsuario.put(newObject) dint make any change in my .json...
//with or without it doesn't do anything
}catch(JSONException e) {
e.printStackTrace();
}
}
這個“寫”功能不會在我的json文件“ /usuarios.json”中進行任何更改,但是,我實際上可以毫無問題地讀取我的json。 例如,我項目的另一個功能讀取我的json文件,以查看登錄JFrame的密碼和用戶名是否匹配:
public boolean verificarInicioDeUsuario(String incomeUsername,String incomePassword) {
JSONArray listaUsuario = usuarios.getJSONArray("Usuarios"); //gets in my "Usuarios"/"User" array
for(int j=0;j<listaUsuario.length();j++) { //Start reading my array
JSONObject user = listaUsuario.getJSONObject(j); //i make a new JSONObject for use it to compare my strings
if((user.getString("username").equals(incomeUsername))&&(user.getString("password").equals(incomePassword))) { //I compare my object username attributes with my incomeStrings
return true; //if the username and password matches in the same object, returns true
}
}
return false; //if not, returns false
}
有什么建議/幫助嗎? <3
您只需將加載的JSON對象更改為內存。 您尚未將其寫入文件。 請使用以下代碼示例,並根據您的程序進行更改。
因此,這里的主要問題是:在JSONObject上調用toString,然后序列化字符串。 JSONObject本身不可序列化。 所以你必須在下面使用:
String jsonString = jsonObject.toString();
樣例代碼:
public void agregarUsuario(String nombre, String apellido, String direccion, String telefono, String correo, String username, String password) //this function add a new user object to my array in the json
{
try {
JSONObject usuarios = getJSONObjectFromFile("/usuarios.json"); //Json object "usuarios"/"users" is my main json obj file
JSONArray listaUsuario = usuarios.getJSONArray("Usuarios"); //I've start my array "Usuarios" (who is in my .json)
JSONObject newObject = new JSONObject(); //I created a new JSONObjectVariable, with the attributes i want in it
newObject.put("nombre", nombre);
newObject.put("apellido", apellido);
newObject.put("direccion", direccion);
newObject.put("telefono", telefono);
newObject.put("correo", correo);
newObject.put("username",username);
newObject.put("password", password);
//at this point my new object has all the attributes i want to put in my array
listaUsuario.put(newObject); //so here i tried to put in my array my new Json object
usuarios.put("Usuarios",listaUsuario); //this line, is one of my attempts to figure out how to put the function working
//it wasn't in the first time, but how listaUsuario.put(newObject) dint make any change in my .json...
//with or without it doesn't do anything
ObjectOutputStream outputStream = null;
outputStream = new ObjectOutputStream(new FileOutputStream("/usuarios.json"));
System.out.println("Start Writing in to file ");
outputStream.writeObject(usuarios.toString());
outputStream.flush();
outputStream.close();
}catch(JSONException e) {
e.printStackTrace();
}
catch (Exception e){
System.err.println("Error writting json: " + e);
}
}
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