import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.RandomAccessFile; public class Test {    public static void readFileByLines() throws Exception{        //项目的绝对路径，也就是想修改的文件路径        String filePath = "D:\\develop\\workspace\\test\\src\\main\\java\\com";        File f = new File(filePath);        String content = "/*\n"+                 "* @(#)"+f.getName()+"\n"+                 "*\n"+                  "* Copyright ***版权信息***.\n"+                 "*/\n";        fileTree(f,content);    }         /**     * 取出所有的文件及文件夹     * @param f 文件夹对象     * @throws Exception     */    public static void fileTree(File f,String content) throws Exception{        File [] t = f.listFiles();        for (int i = 0; i < t.length; i++) {            if(t[i].isDirectory()){                fileTree(t[i],content);            }else{                insert(t[i],content);            }        }    }         /*public static void main(String[] args) {        try {            readFileByLines();        } catch (Exception e) {            e.printStackTrace();        }    }*/         /**     * 开始插入内容     * @param f 文件对象     * @throws IOException     */    public static void insert(File f,String content) throws IOException{        File temp = File.createTempFile("temp", null);        temp.deleteOnExit();        RandomAccessFile raf = new RandomAccessFile(f, "rw");        FileOutputStream tempOut = new FileOutputStream(temp);        FileInputStream tempInput = new FileInputStream(temp);        raf.seek(0);        byte[] buf = new byte[64];        int hasRead = 0;        while ((hasRead = raf.read(buf))>0) {            tempOut.write(buf, 0, hasRead);        }        raf.seek(0);                 raf.write(content.getBytes());        while ((hasRead = tempInput.read(buf))>0) {            raf.write(buf,0,hasRead);        }        raf.close();        tempOut.close();        tempInput.close();    }}