Java：对象转为JSON对象时元素处理

@Override
    public String toJsonString() throws Exception {
        return JSONObject.toJSONString(this,SerializerFeature.SortField);
    }

• SortField 按字段名称排序后输出。默认为false
• BeanToArray 将对象转为array输出

public enum SerializerFeature {
    QuoteFieldNames,
    
    UseSingleQuotes,
    
    WriteMapNullValue,
    
    WriteEnumUsingToString,
    
    WriteEnumUsingName,
    
    UseISO8601DateFormat,
    
    WriteNullListAsEmpty,
    
    WriteNullStringAsEmpty,
    
    WriteNullNumberAsZero,
    
    WriteNullBooleanAsFalse,
    
    SkipTransientField,
    
    SortField,
    
    @Deprecated
    WriteTabAsSpecial,
    
    PrettyFormat,
    
    WriteClassName,

    
    DisableCircularReferenceDetect, // 32768

    
    WriteSlashAsSpecial,

    
    BrowserCompatible,

    
    WriteDateUseDateFormat,

    
    NotWriteRootClassName,

    
    DisableCheckSpecialChar,

    
    BeanToArray,

    
    WriteNonStringKeyAsString,
    
    
    NotWriteDefaultValue,
    
    
    BrowserSecure,
    
    
    IgnoreNonFieldGetter,
    
    
    WriteNonStringValueAsString,
    
    
    IgnoreErrorGetter,

    
    WriteBigDecimalAsPlain,

    
    MapSortField;
    }