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[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时会遇到很多麻烦。
我的代码是西班牙语,所以我会尽力将注释中的变量和方法翻译成英文。
这是我的.JSON(默认用户的所有属性都为“ admin”):
{"Usuarios":[{"nombre":"Admin","apellido":"Admin","direccion":"Admin","telefono":"Admin","correo":"Admin@admin.com","username":"admin","password":"admin"}]}
首先,我创建了函数,这些函数可以毫无问题地验证用户“ admin”的属性。 因此,在读取JSON文件(仅在其上写入)时,它们并不是问题:
所以这是这个功能的问题:
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();
}
}
这个“写”功能不会在我的json文件“ /usuarios.json”中进行任何更改,但是,我实际上可以毫无问题地读取我的json。 例如,我项目的另一个功能读取我的json文件,以查看登录JFrame的密码和用户名是否匹配:
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
}
有什么建议/帮助吗? <3
您只需将加载的JSON对象更改为内存。 您尚未将其写入文件。 请使用以下代码示例,并根据您的程序进行更改。
因此,这里的主要问题是:在JSONObject上调用toString,然后序列化字符串。 JSONObject本身不可序列化。 所以你必须在下面使用:
String jsonString = jsonObject.toString();
样例代码:
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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