package filet;
import java.io.FileOutputStream;
import java.nio.file.FileStore;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;
public class FileTest {
public static void main(String[] args) throws Exception {
//复制文件
Files.copy(Paths.get("C:\\Users\\Administrator\\Desktop\\a.txt"),new FileOutputStream("C:\\Users\\Administrator\\Desktop\\test.txt"));
//一次性得到fileTest的所有文件
List<String> lines = Files.readAllLines(Paths.get("C:\\Users\\Administrator\\Desktop\\a.txt"));
System.out.println(lines);
//复制文件
Files.copy(Paths.get("C:\\Users\\Administrator\\Desktop\\dd.png"),new FileOutputStream("C:\\Users\\Administrator\\Desktop\\ddtest.png"));
List<String> pome = new ArrayList<>();
pome.add("aadddd");
pome.add("dfgfdf");
//直接将多个字符串内容写入指定文件
Files.write(Paths.get("C:\\Users\\Administrator\\Desktop\\a.txt"),pome);
//使用java8新增的Stream API读取文件内容
Files.list(Paths.get(".")).forEach(path->System.out.println(path));
Files.lines(Paths.get("C:\\Users\\Administrator\\Desktop\\a.txt")).forEach(line->System.out.println(line));
//判断c盘可用空间
FileStore csStore = Files.getFileStore(Paths.get("C:"));
System.out.println("C共有空间:"+csStore.getTotalSpace());
System.out.println("C可用空间:"+csStore.getUsableSpace());
}
}
使用FileVisitor遍历文件和目录
package filet;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
public class FileVisitorTest {
public static void main(String[] args) throws Exception {
//遍历该盘下的所有文件和子目录
Files.walkFileTree(Paths.get("C:\\Users\\Administrator\\Desktop"), new SimpleFileVisitor<Path>() {
//访问文件时触发该方法
@Override
public FileVisitResult visitFile(Path file,BasicFileAttributes attrs) {
System.out.println("正在访问"+file+"文件");
//找到了File
if(file.endsWith("a.txt")) {
System.out.println("已找到目标文件");
return FileVisitResult.TERMINATE;
}
return FileVisitResult.CONTINUE;
}
//开始访问目标目录时触发该方法
@Override
public FileVisitResult preVisitDirectory(Path dir,BasicFileAttributes attrs) {
System.out.println("正在访问:"+dir+"路径");
return FileVisitResult.CONTINUE;
}
});
}
}
