java中操作文件属性的一些办法[Java编程]

当Java.io中,假如文件的操作的时刻,判断能否躲藏用File.ishiden()

判断能否只读,可用File.canWrite().

2. 当要设置能否是可读大概是躲藏时,在java中除了供应File.setReadOnly()外,就无其他办法了.

所以我们必须到Dos环境下去设置,在java顶用Runtime.getRuntime().exec("attrib " + """ + file.getAbsolutePath()+ """+ " +R")该办法可以实现.因为途径file.getAbsolutePath()中大概会还有空格,所以必须用引号把它括起来,当作一个参数.这样便可以实现了

(1)设置只读Runtime.getRuntime().exec("attrib " + """ + file.getAbsolutePath()+ """+ " +R");

(2)设置可写Runtime.getRuntime().exec("attrib " + """ + file.getAbsolutePath()+ """+ " -R");

(3)设置躲藏Runtime.getRuntime().exec("attrib " + """ + file.getAbsolutePath()+ """+ " +H");

(4)设置非躲藏Runtime.getRuntime().exec("attrib " + """ + file.getAbsolutePath()+ """+ " -H");

3.关于读写文件的一些操作源代码

package fileControl;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.RandomAccessFile;
public class FileControl {
private static String fileName;
private static File file;
public static void main(String[] args){
try {
fileName = "exercise.java";
file = new File("E:" + "", fileName);
if (file.exists()){
//　file.delete();
} else {
file.createNewFile();
}
if (file.isDirectory()){
System.out.println("this file is directory");
}
if (file.isFile()){
System.out.println("this file is a file");
}
FileWriter fw = new FileWriter("E:" + "" + fileName);
// 缓冲写入文件,并且可以通过转义符或是bw.newLine();来换行
BufferedWriter bw = new BufferedWriter(fw);
//　将字符串写入文件
bw.write(" 大家好!");
bw.newLine();
bw.write("本?是《JSP?程本领》");
bw.newLine();
bw.write("?多多指教!");
bw.newLine();
bw.write("email:stride@sina.comqianyf");
bw.flush();
bw.close();
//在文件拟定位置追加内容
RandomAccessFile rf = new RandomAccessFile("E:" + "" + fileName, "rw");
rf.seek(rf.length());
rf.writeBytes(" zui jia　de");
rf.close();
// 通过缓冲来读文件
FileReader fr = new FileReader("E:" + "" + fileName);
BufferedReader br = new BufferedReader(fr);
String lineData = br.readLine();
while (null != lineData){
System.out.println(lineData);
lineData = br.readLine();
}
} catch (IOException ee){
System.out.println("System Exception");
}
}
}