Java访问权限控制，为Java操作文件、写入文件分配合适的权限，定义写到文件的信息、定义文件,输出到c:/hello.txt、写信息到文件、关闭输出流。-Java access control, assign the appropriate permissions for Java operating files, write files, define the information written to the file definition file, output to c :/ hello.txt write information to a file, close the output stream.