Java修改文件内容
学习了：https://www.cnblogs.com/XiaoyangBoke/p/7468268.html
进行了文件内容的修改：
package com.stono.thread2;import java.io.File;import java.io.IOException;import java.io.RandomAccessFile;public class ModifyPackage { public static void main(String[] args) {
String path = "D:\\Java\\gitworkspace\\Coding\\src\\com\\stono\\thread2";
File root = new File(path);
File[] listFiles = root.listFiles(); for (File file : listFiles) { boolean isDirectory = file.isDirectory();
String name = file.getName();
String substring = name.substring(4); if(isDirectory && name.length() == 7) { int parseInt = Integer.parseInt(substring); if(parseInt<100) {
System.out.println(parseInt);
File[] listFiles2 = file.listFiles(); // 找到里面的文件了；
for (File file2 : listFiles2) {
String oldstr="com.stono.thread2.page";
String newStr="com.stono.thread2.page0";
modifyFileContent(file2,oldstr,newStr);
}
}
}
}
} private static boolean modifyFileContent(File file2, String oldstr, String newStr) {
RandomAccessFile raf = null; try {
raf = new RandomAccessFile(file2, "rw");
String line = null; long lastPoint = 0; //记住上一次的偏移量
while ((line = raf.readLine()) != null) { final long ponit = raf.getFilePointer(); if(line.contains(oldstr)){
String str=line.replace(oldstr, newStr);
raf.seek(lastPoint);
raf.writeBytes(str);
}
lastPoint = ponit;
}
} catch (Exception e) {
e.printStackTrace();
} finally { try {
raf.close();
} catch (IOException e) {
e.printStackTrace();
}
} return true;
}
}
