Java遍历目录下全部文件并替换指定字符串

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;

public class Test {
/**
* @author itmyhome
*/
public static void main(String[] args) {
File f = new File("F:/javaAPI/java/lang/reflect");
print(f, 0);
}

/**
* 遍历目录
*
* @param f
* @param len
*/
public static void print(File f, int len) {
File[] file = f.listFiles();

for (int i = 0; i < file.length; i++) {
if (file[i].isDirectory()) { //推断是否目录
print(file[i], len + 1);
}

// 为防止输出文件覆盖源文件，所以更改输出盘路径 也可自行设置其它路径
File outPath = new File(file[i].getParent().replace("F:", "E:"));
File readfile = new File(file[i].getAbsolutePath());

if (!readfile.isDirectory()) {
String filename = readfile.getName(); // 读到的文件名称
String absolutepath = readfile.getAbsolutePath(); // 文件的绝对路径
readFile(absolutepath, filename, i, outPath); // 调用 readFile
}
}
}

/**
* 读取目录下的文件
*
* @return
*/
public static void readFile(String absolutepath, String filename,
int index, File outPath) {
try {
BufferedReader bufReader = new BufferedReader(new InputStreamReader(
new FileInputStream(absolutepath), "gb2312")); // 数据流读取文件

StringBuffer strBuffer = new StringBuffer();
String newStr = "i love you too";
String oldStr = "i love you";

for (String temp = null; (temp = bufReader.readLine()) != null;
temp = null) {
if ((temp.indexOf(oldStr) != -1) &&
(temp.indexOf(oldStr) != -1)) { // 推断当前行是否存在想要替换掉的字符
temp = temp.replace(oldStr, newStr); // 此处进行替换
}

strBuffer.append(temp);
strBuffer.append(System.getProperty("line.separator")); // 换行符
}

bufReader.close();

if (outPath.exists() == false) { // 检查输出目录是否存在，若不存在先创建
outPath.mkdirs();
System.out.println("已成功创建输出目录：" + outPath);
}

PrintWriter printWriter = new PrintWriter(outPath + "\\" +
filename, "gb2312"); // 替换后输出文件路径
printWriter.write(strBuffer.toString().toCharArray()); //又一次写入
printWriter.flush();
printWriter.close();
System.out.println("第 " + (index + 1) + " 个文件   " + absolutepath +
"  已成功输出到    " + outPath + "\\" + filename);
} catch (Exception e) {
e.printStackTrace();
}
}
}