是否可以使用 PHP 中的 json_encode() 函数对属于类对象的变量进行编码? 如果是,那么我如何在java中使用gson取回类对象fields:
条目 jsonElement.;
jsonElement.getValue.getAs... 可用的函数 getAsString、getAsInt.. 等在这种情况下没有用。
最佳答案
来自 http://www.json.org :
JSON (JavaScript Object Notation) is a lightweight data-interchange format. It is easy for humans to read and write. It is easy for machines to parse and generate. It is based on a subset of the JavaScript Programming Language, Standard ECMA-262 3rd Edition - December 1999
它是一种数据交换格式,因此任何语言都可以使用它。这就是为什么您可以通过您喜欢的任何语言使用 Twitter 的 REST api。
代码:
<?php
class Point {
private $x;
private $y;
public function __construct($x, $y) {
$this->x = $x;
$this->y = $y;
}
public static function fromJSON($json) {
//return json_decode($json);
$obj = json_decode($json);
return new Point($obj->x, $obj->y);
}
public function toJSON() {
/*
If you want to omit properties because of security, I think you will have to write this yourself.
return json_encode(array(
"x" => $this->x,
"y" => $this->y
));
You could easily do something like to omit x for example.
$that = $this;
unset($that->x);
return json_encode(get_object_vars($that));
*/
// Thank you http://stackoverflow.com/questions/4697656/using-json-encode-on-objects-in-php/4697749#4697749
return json_encode(get_object_vars($this));
}
public function __toString() {
return print_r($this, true);
}
}
$point1 = new Point(4,8);
$json = $point1->toJSON();
echo $json;
echo $point1;
$point2 = Point::fromJSON($json);
echo $point2;
输出:
alfred@alfred-laptop:~/www/stackoverflow/6719084$ php class.php
{"x":4,"y":8}Point Object
(
[x:Point:private] => 4
[y:Point:private] => 8
)
Point Object
(
[x:Point:private] => 4
[y:Point:private] => 8
)
这个 json_string 您可以导入到您喜欢的对象中。
来自 Java
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package point;
import com.google.gson.Gson;
/**
*
* @author alfred
*/
public class Point {
private int x,y;
public static Gson gson = new Gson();
public Point(int x, int y) {
this.x = x;
this.y = y;
}
public static Point fromJSON(String json) {
Point p = gson.fromJson(json, Point.class);
return p;
}
@Override
public String toString() {
return "(" + x + "," + y + ")";
}
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
Point fromJSON = Point.fromJSON("{\"x\":4,\"y\":8}");
System.out.println(fromJSON);
}
}
输出
(4,8)
关于java - java中的JSON php和gson,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/6719084/