JAVA的文件随机存取（RandomAccessFile）的I/O效率较低。通过分析其中原因，提出解决方案。通过与其它文件访问类的性能对比，证明了其实用价值。-JAVA random access of the document (RandomAccessFile) of I/O and less efficient. By analyzing the reasons for these proposed solutions. With other types of file access pe