Question

<java>遍历D盘查找某个txt文件，将txt文件中全部的a字符替换成@.

Answer 1

package test;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
public class ReplaceStr {
public static void main(String[] args) {
String file="d:/我的周报.txt";
checkandreplace(file);
}
/*输入文件名，自动把txt中的某个字符替换掉*/
public static void checkandreplace(String strfile) {
try {
File file =new File(strfile);
//把文件读到StringBuffer中缓存起来
BufferedReader bufReader = new BufferedReader(
new InputStreamReader(new FileInputStream(file)));
StringBuffer strBuf = new StringBuffer();
String tmp = null;
while ((tmp = bufReader.readLine()) != null) {
if (tmp != null) {
tmp = tmp.replaceAll("\\&", "#");//两个\\表示转义
tmp = tmp.replaceFirst("a", "\\@ ");
strBuf.append(tmp);
strBuf.append(System.getProperty("line.separator"));//换行用的
}
}
bufReader.close();
//把文件写回原文件
PrintWriter printWriter = new PrintWriter(strfile);
printWriter.write(strBuf.toString());
printWriter.flush();
printWriter.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}