elemental.json和com.google.json库有什么区别? [英] What is the difference between elemental.json and com.google.json library?

问题描述

为什么我们在com.google.json上拥有elemental.json库?

Why do we have elemental.json library over com.google.json?

我正努力在Vaadin 7中创建JsonArray.

I'm struggling with the creation of JsonArray in Vaadin 7.

在Json.createArray()中，没有add方法.如何创建json数组?

In Json.createArray() there is no add method. How can I create a json array?

我想创建一个像这样的数组:

I want to create an array like:

var shapeArray = 
[
    {type: 'rectangle', x:50, y:50, width : 50, height: 50},
    {type: 'circle', x:75, y:150,  r : 20}, 
    {type: 'rectangle', x:50, y:200, width : 100, height: 20},
    {type: 'circle', x:75, y:300,  r : 30}, 
];

我想念什么吗?

推荐答案

按照此官方声明(从7.4.0开始)elemental.json.*替换了旧软件包.

As per this official statement, starting with 7.4.0 elemental.json.* replaces the old packages.

我玩了一段时间，因为我也不得不适应这些变化，我至少发现了以下两种可能性:

I've played around a bit as I also had to adapt to these changes and I found at least these 2 possibilities:

import elemental.json.Json;
import elemental.json.JsonArray;
import elemental.json.JsonValue;
import elemental.json.impl.JsonUtil;
import org.junit.Test;

public class JsonTest {

    @Test
    public void shouldParseJson() {
        JsonArray array = JsonUtil.parse("[\n" +
                "    {'type': 'rectangle', 'x':50, 'y':50, 'width': 50, 'height': 50},\n" +
                "    {'type': 'circle', 'x':75, 'y':150,  'r' : 20}, \n" +
                "    {'type': 'rectangle', 'x':50, 'y':200, 'width' : 100, 'height': 20},\n" +
                "    {'type': 'circle', 'x':75, 'y':300,  'r' : 30}, \n" +
                "]");


        System.out.println("Parsed string array:\n" + JsonUtil.stringify(array, 2));
    }


    @Test
    public void shouldCreateArray() {
        //for the sake of brevity I'll create the object by also parsing a string, but you get the general idea
        JsonValue object = JsonUtil.parse("{'type': 'rectangle', 'x':50, 'y':50, 'width': 50, 'height': 50}");
        JsonArray array = Json.createArray();
        array.set(0, object);

        System.out.println("Manually created array:\n" + JsonUtil.stringify(array, 2));
    }
}

哪个输出

Parsed string array:
[
  {
    "type": "rectangle",
    "x": 50,
    "y": 50,
    "width": 50,
    "height": 50
  },
  {
    "type": "circle",
    "x": 75,
    "y": 150,
    "r": 20
  },
  {
    "type": "rectangle",
    "x": 50,
    "y": 200,
    "width": 100,
    "height": 20
  },
  {
    "type": "circle",
    "x": 75,
    "y": 300,
    "r": 30
  }
]

和

Manually created array:
[
  {
    "type": "rectangle",
    "x": 50,
    "y": 50,
    "width": 50,
    "height": 50
  }
]

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