Fastjson is a JSON processor (JSON parser + JSON generator) written in Java

Guava is a suite of core and expanded libraries that include

The Apache Commons Codec component contains encoders and decoders for

The Apache Commons IO library contains utility classes, stream implementations, file filters,

Apache Commons Lang, a package of Java utility classes for the classes that are in java.lang's hierarchy, or are ...

The Apache Commons Collections package contains types that extend and augment the Java Collections Framework.