list map转换成json格式以及相关jar包（java）

list map转换json格式数据以及相关的jar包 list转换后格式： [{"address":"广东省惠州","name":"tom","id":1,"age":23},{"address":"广东省深圳市","name":"jone","id":2,"age":84}] map转换后格式： {"address":"广东省惠州","name":"tom","id":1,"age":23}