問題出現：使用FastJson的JSONArray型別作為返回資料，當像JSONArray物件中新增JSONObject物件，而JSONObject物件中包含相同的節點資料時，FastJson會防止返回資料棧溢位的問題，自動將JSONArray中相同的節點資料使用引用方式代替，即：{"$ref":$....[0]}

解決方案：

FastJson提供了相關的配置引數禁用迴圈引用。所以當我們再返回資料前對JSONArray進行進行操作即可，程式碼如下:

// jsonArray引數為原要返回的JSONArray資料
JSONArray jsonArrayRtn= JSONArray.parseArray(JSON.toJSONString(jsonArray, SerializerFeature.DisableCircularReferenceDetect));
 

當然FastJson還提供了其它配置引數，原始檔如下：

//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package com.alibaba.fastjson.serializer;

public enum SerializerFeature {
    QuoteFieldNames,
    UseSingleQuotes,
    WriteMapNullValue,
    WriteEnumUsingToString,
    WriteEnumUsingName,
    UseISO8601DateFormat,
    WriteNullListAsEmpty,
    WriteNullStringAsEmpty,
    WriteNullNumberAsZero,
    WriteNullBooleanAsFalse,
    SkipTransientField,
    SortField,
    /** @deprecated */
    @Deprecated
    WriteTabAsSpecial,
    PrettyFormat,
    WriteClassName,
    DisableCircularReferenceDetect,
    WriteSlashAsSpecial,
    BrowserCompatible,
    WriteDateUseDateFormat,
    NotWriteRootClassName,
    DisableCheckSpecialChar,
    BeanToArray,
    WriteNonStringKeyAsString,
    NotWriteDefaultValue,
    BrowserSecure,
    IgnoreNonFieldGetter;

    private final int mask = 1 << this.ordinal();

    private SerializerFeature() {
    }

    public final int getMask() {
        return this.mask;
    }

    public static boolean isEnabled(int features, SerializerFeature feature) {
        return (features & feature.getMask()) != 0;
    }

    public static boolean isEnabled(int features, int fieaturesB, SerializerFeature feature) {
        int mask = feature.getMask();
        return (features & mask) != 0 || (fieaturesB & mask) != 0;
    }

    public static int config(int features, SerializerFeature feature, boolean state) {
        if (state) {
            features |= feature.getMask();
        } else {
            features &= ~feature.getMask();
        }

        return features;
    }

    public static int of(SerializerFeature[] features) {
        if (features == null) {
            return 0;
        } else {
            int value = 0;
            SerializerFeature[] var2 = features;
            int var3 = features.length;

            for(int var4 = 0; var4 < var3; ++var4) {
                SerializerFeature feature = var2[var4];
                value |= feature.getMask();
            }

            return value;
        }
    }
}