WriteConfig 使用示例

代码如下：

import encoding.json.stream.{JsonWriter, WriteConfig, JsonSerializable}
import std.io.ByteArrayStream

main() {
    // 构造 JsonWriter
    let buffer = ByteArrayStream()
    let writer = JsonWriter(buffer)

    // 设置 JSON 写格式配置
    let fmtCfg = WriteConfig.pretty
    writer.writeConfig = fmtCfg

    // 写 JSON 
    writer.writeValue(MyObj())

    // 打印 JSON 序列化字符串
    println(String.fromUtf8(buffer.bytes()))

    0
}

// 支持 JSON 序列化的类
class MyObj <: JsonSerializable {
    public func toJson(w: JsonWriter): Unit {
        w.startObject()
        w.writeName("Name").writeValue("zhangsan")
        w.writeName("Age").writeValue(18)
        w.writeName("Scores").writeValue([88.8, 99.9])
        w.writeName("Class")
        w.startObject()
        w.writeName("Name").writeValue("Class A")
        w.writeName("Students Number").writeValue(33)
        w.endObject()
        w.endObject()
        w.flush()
    }
}

运行结果：

{
    "Name": "zhangsan",
    "Age": 18,
    "Scores": [
        88.8,
        99.9
    ],
    "Class": {
        "Name": "Class A",
        "Students Number": 33
    }
}