Fastjson 重复引用对象的问题

出现相同的对象时，fastjson默认开启引用检测将相同的对象写成引用的形式

引用是通过"$ref"来表示的

复现

    public static void main(String[] args) {
        final JSONObject src = new JSONObject();
        src.put("a", "b");
        src.put("c", "d");
        src.put("e", "f");
        final JSONObject object = new JSONObject();
        object.put("src", src);
        object.put("target", src);

        System.out.println(object.toJSONString());
    }

输出:

{"src":{"a":"b","c":"d","e":"f"},"target":{"$ref":"$.src"}}

Process finished with exit code 0

解决办法

使用 DisableCircularReferenceDetect来禁止循环引用检测

//在可以添加SerializerFeature参数的地方添加此配置项即可
System.out.println(object.toString(SerializerFeature.DisableCircularReferenceDetect));

输出:

{"src":{"a":"b","c":"d","e":"f"},"target":{"a":"b","c":"d","e":"f"}}

Process finished with exit code 0

原文