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文件组成

RandomAccessFile常用方法

范例：实现随机写入

package com.itkey.javareview.温故知新.io;import lombok.SneakyThrows;import java.io.File;import java.io.RandomAccessFile;import java.nio.charset.StandardCharsets;public class RandomAccessFileDemo {       public static final int MAX_LENGTH =8;    @SneakyThrows    public static void main(String[] args) {           File file = new File("/Users/itkey/Documents/GitHub/java-review/src/main/java/com/itkey/javareview/温故知新/io" + File.separator + "yootk.data");        if(!file.getParentFile().exists()){               file.getParentFile().mkdirs();        }        RandomAccessFile raf = new RandomAccessFile(file,"rw");        String names[] = new String[] {   "zhangsan","lisi","wangwu","zhaoliu","sunqi"};        int ages[] = new int[] {   12,13,17,16,15};        int i = 0;        for (String name : names) {               name =  addSpace(name);            raf.write(name.getBytes(StandardCharsets.UTF_8));            raf.writeInt(ages[i]);            i++;        }        raf.close();    }    /**     * 字符过短，补空格     * @param str     * @return     */    public static String addSpace(String str){           StringBuffer stringBuffer = new StringBuffer(str);        while (stringBuffer.length()

读取二进制的随机文件

package com.itkey.javareview.温故知新.io;import lombok.SneakyThrows;import java.io.File;import java.io.RandomAccessFile;import java.nio.charset.StandardCharsets;public class RandomAccessFile生成二进制文件 {       public static final int MAX_LENGTH =8;    @SneakyThrows    public static void main(String[] args) {           File file = new File("/Users/itkey/Documents/GitHub/java-review/src/main/java/com/itkey/javareview/温故知新/io" + File.separator + "yootk.data");        if(!file.getParentFile().exists()){               file.getParentFile().mkdirs();        }        RandomAccessFile raf = new RandomAccessFile(file,"rw");        String names[] = new String[] {   "zhangsan","lisi","wangwu","zhaoliu","sunqi"};        int ages[] = new int[] {   12,13,17,16,15};        int i = 0;        for (String name : names) {               name =  addSpace(name);            raf.write(name.getBytes(StandardCharsets.UTF_8));            raf.writeInt(ages[i]);            i++;        }        raf.close();    }    /**     * 字符过短，补空格     * @param str     * @return     */    public static String addSpace(String str){           StringBuffer stringBuffer = new StringBuffer(str);        while (stringBuffer.length()