通过java读取电脑串口数据，免去下载串口助手(Read computer serial data)

java rxtx 串口读取传感器内容，通过JSON格式传输(Java rxtx serial read sensor content, through the JSON format transmission)

读取USB串口数据，支持热插拔，目前可以使用，支持其他程序调用，也可以直接访问获取读取到数据。(Read USB serial data, support hot plug, can be used at present, support other program calls, also can directly access to get, read to the data.)