import java.io.*;
/**
*
* 功能描述：創(chuàng)建TXT文件并進(jìn)行讀、寫、修改操作
*
*/
public class ReadWriteFile {
public static BufferedReader bufread;
//指定文件路徑和名稱
private static String path = "D:/suncity.txt";
private static File filename = new File(path);
private static String readStr ="";
/**
* 創(chuàng)建文本文件.
* @throws IOException
*
*/
public static void creatTxtFile() throws IOException{
if (!filename.exists()) {
filename.createNewFile();
System.err.println(filename + "已創(chuàng)建！");
}
}
/**
* 讀取文本文件.
*
*/
public static String readTxtFile(){
String read;
FileReader fileread;
try {
fileread = new FileReader(filename);
bufread = new BufferedReader(fileread);
try {
while ((read = bufread.readLine()) != null) {
readStr = readStr + read+ "\r\n";
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println("文件內(nèi)容是:"+ "\r\n" + readStr);
return readStr;
}
/**
* 寫文件.
*
*/
public static void writeTxtFile(String newStr) throws IOException{
//先讀取原有文件內(nèi)容，然后進(jìn)行寫入操作
String filein = newStr + "\r\n" + readStr + "\r\n";
RandomAccessFile mm = null;
try {
mm = new RandomAccessFile(filename, "rw");
mm.writeBytes(filein);
} catch (IOException e1) {
// TODO 自動(dòng)生成 catch 塊
e1.printStackTrace();
} finally {
if (mm != null) {
try {
mm.close();
} catch (IOException e2) {
// TODO 自動(dòng)生成 catch 塊
e2.printStackTrace();
}
}
}
}
/**
* 將文件中指定內(nèi)容的第一行替換為其它內(nèi)容.
*
* @param oldStr
* 查找內(nèi)容
* @param replaceStr
* 替換內(nèi)容
*/
public static void replaceTxtByStr(String oldStr,String replaceStr) {
String temp = "";
try {
File file = new File(path);
FileInputStream fis = new FileInputStream(file);
InputStreamReader isr = new InputStreamReader(fis);
BufferedReader br = new BufferedReader(isr);
StringBuffer buf = new StringBuffer();
// 保存該行前面的內(nèi)容
for (int j = 1; (temp = br.readLine()) != null
&& !temp.equals(oldStr); j++) {
buf = buf.append(temp);
buf = buf.append(System.getProperty("line.separator"));
}
// 將內(nèi)容插入
buf = buf.append(replaceStr);
// 保存該行后面的內(nèi)容
while ((temp = br.readLine()) != null) {
buf = buf.append(System.getProperty("line.separator"));
buf = buf.append(temp);
}
br.close();
FileOutputStream fos = new FileOutputStream(file);
PrintWriter pw = new PrintWriter(fos);
pw.write(buf.toString().toCharArray());
pw.flush();
pw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* main方法測(cè)試
* @param s
* @throws IOException
*/
public static void main(String[] s) throws IOException {
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