使用z/OS实现高效文件管理的示例代码和技术解答

本示例展示了如何在z/OS操作系统上实现高效的文件管理，通过COBOL语言编写。代码演示了文件的创建、读取、写入和关闭等基本操作，并通过注释详细解释每个步骤的功能和实现方式。这有助于开发者理解z/OS上文件处理的基本原理。

IDENTIFICATION DIVISION.
PROGRAM-ID. FileManagementExample.

DATA DIVISION.
WORKING-STORAGE SECTION.
01 FILE-HANDLE          PIC X(8).
01 FILE-RECORD          PIC X(80).
01 FILE-STATUS          PIC XX.
01 FILE-NAME            PIC X(20) VALUE 'EXAMPLE.TXT'.

PROCEDURE DIVISION.
    OPEN OUTPUT FILE-HANDLE
        FILE-NAME
        INVALID KEY DISPLAY 'ERROR OPENING FILE' END-OPEN.

    MOVE 'Hello, z/OS File Management!' TO FILE-RECORD.

    WRITE FILE-RECORD INVALID KEY DISPLAY 'ERROR WRITING TO FILE' END-WRITE.

    CLOSE FILE-HANDLE INVALID KEY DISPLAY 'ERROR CLOSING FILE' END-CLOSE.

    OPEN INPUT FILE-HANDLE
        FILE-NAME
        INVALID KEY DISPLAY 'ERROR OPENING FILE' END-OPEN.

    READ FILE-HANDLE INTO FILE-RECORD
        INVALID KEY DISPLAY 'ERROR READING FROM FILE' END-READ.

    CLOSE FILE-HANDLE INVALID KEY DISPLAY 'ERROR CLOSING FILE' END-CLOSE.

    DISPLAY 'File Content: ' FILE-RECORD.

    STOP RUN.

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