import java.io.File
import java.io.FileNotFoundException
import java.io.FileReader
import java.io.FileWriter
import java.io.IOException
import java.io.PrintWriter
public class Day02_B {
static String path="K:/Test/Name.txt"//路径
public static void main(String[] args) {
File fileText=new File(path)//文件
if(fileText.canExecute()) //如果文件存在就继续
setText(fileText,"刚","xx")//“刚”指定改为：“XX”
}
private static void setText(File fileText,String target,String src) {//修改
BufferedReader br=null
PrintWriter pw=null
StringBuffer buff=new StringBuffer()//临时容器!
String line=System.getProperty("line.separator")//平台换行!
try {
br=new BufferedReader(new FileReader(fileText))
for(String str=br.readLine()str!=nullstr=br.readLine()) {
if(str.contains(target))
str=str.replaceAll(target,src)
buff.append(str+line)
}
pw=new PrintWriter(new FileWriter(fileText),true)
pw.println(buff)
} catch (FileNotFoundException e) {
e.printStackTrace()
}catch (IOException e) {
e.printStackTrace()
}finally {
if(br!=null)
try {
br.close()
} catch (IOException e) {
e.printStackTrace()
}
if(pw!=null)
pw.close()
}
}
}
把文件按行读入一个List,然后遍历这个List,改掉要改的行,重新把list写入文件.//readString2List
public static List getAllLineFromFile(File file) {
try {
FileReader fr = new FileReader(file.getPath())
BufferedReader br = new BufferedReader(fr)
List list = new ArrayList()
String ss = ""
while ((ss = br.readLine()) != null)
list.add(ss)
fr.close()
return list
} catch (Exception e) {
e.printStackTrace()
return null
}
}
//找到要修改的行,改掉要改的东西
//把list重新写入文件
