IntelliJ IDEA toString templates for JSON output

JSON use StringBuilder

public java.lang.String toString() {
final java.lang.StringBuilder sb = new java.lang.StringBuilder("{");
#set ($i = 0)
#foreach ($member in $members)#if ($i == 0)
sb.append("#####
#else
sb.append(",####
#end#if ($member.stringArray)
\"$member.name\":");
#elseif ($member.string || $member.date)
\"$member.name\":\"")
#elseif($member.map||$member.collection)
\"$member.name\":");
#else
\"$member.name\":")
#end#if ($member.stringArray)
if (($member.accessor) != null && ($member.accessor).length > 0) {
    sb.append("[");
    final int stringArrayLength = ($member.accessor).length;
    for (int i = 0; i < stringArrayLength; i++) {
        sb.append("\"").append(($member.accessor)[i]).append("\"");
        if (i < stringArrayLength - 1) {
            sb.append(",");
        } else {
            sb.append("]");
        }
    }
} else {
    sb.append("[]");
}
#elseif ($member.primitiveArray || $member.objectArray)
.append(java.util.Arrays.toString($member.accessor));
#elseif ($member.string || $member.date)
.append(java.util.Objects.toString($member.accessor,"")).append('\"');
#elseif($member.list)
if (($member.accessor) != null && !($member.accessor).isEmpty()) {
    sb.append("[");
    final int listSize = ($member.accessor).size();
    for (int i = 0; i < listSize; i++) {
        final Object listValue=($member.accessor).get(i);
        if (listValue instanceof CharSequence) {
            sb.append("\"").append(java.util.Objects.toString(listValue,"")).append("\"");
        } else {
            sb.append(java.util.Objects.toString(listValue,""));
        }
        if (i < listSize - 1) {
            sb.append(",");
        } else {
            sb.append("]");
        }
    }
} else {
    sb.append("[]");
}
#elseif($member.map)
if (($member.accessor) != null && !($member.accessor).isEmpty()) {
    sb.append("{");
    final Set<?> mapKeySet=($member.accessor).keySet();
    for (java.lang.Object mapKey: mapKeySet) {
        final Object mapValue=($member.accessor).get(mapKey);
        sb.append("\"").append(mapKey).append("\":\"").append(java.util.Objects.toString(mapValue,"")).append("\",");
    }
    sb.replace(sb.length() - 1, sb.length(), "}");
} else {
    sb.append("{}");
}
#elseif($member.collection)
if (($member.accessor) != null && !($member.accessor).isEmpty()) {
    sb.append("[");
    for (java.lang.Object collectionValue: $member.accessor) {
        sb.append("\"").append(java.util.Objects.toString(collectionValue,"")).append("\",");
    }
    sb.replace(sb.length() - 1, sb.length(), "]");
} else {
    sb.append("[]");
}
#else
.append($member.accessor);
#end#set ($i = $i + 1)
#end
sb.append('}');
return sb.toString();
}

But it isn't thread safe, naa.
Wait local StringBuilder are safe. I got warnings form intillj and got worried sorry

Thread safety should be guaranteed by the developer. JSON serialization operation feels that in most cases there will be no multi-threaded operation of the same serialized object. If you want to operate the same serialized object in different threads, then is necessary to lock the write and read operations, but this violates the original intention of fast serialization. This template is only used to generate the JSON string the fastest and does not rely on the serialization tool library. It cannot solve 100% of the problems, but it is suitable and convenient for most scenarios.

Thank you. I was using it as toString 🤦🏻‍♂️
I finally understood the use case. It's quite elegant to use case.