java文件操作之Path,Paths,Files

package filespaths;import org.junit.Test;import java.io.*;import java.net.URI;import java.nio.charset.StandardCharsets;import java.nio.file.FileSystems;import java.nio.file.Files;import java.nio.file.Path;import java.nio.file.Paths;import java.nio.file.attribute.PosixFilePermission;import java.util.HashSet;import java.util.List;import java.util.Set;import java.util.stream.Stream;/** * @Author kingboy * @Date 2017/4/13 11:05 * @Description Path is used to Path Sample * @email kingboyworld@163.com */public class PathTest {  private static String separator = File.separator;  /**   * 构建Path   */  @Test  public void constructon(){    //1.Paths    Path path = Paths.get("/Users/kingboy/Desktop/");    Path path1 = Paths.get(URI.create("/Users/kingboy/Desktop/"));    //2.FileSystems    Path path2 = FileSystems.getDefault().getPath("/Users/kingboy/Desktop/");    //3.File    Path path3 = new File("/Users/kingboy/Desktop/").toPath();  }  /**   * 创建一个空文件/文件夹   * @throws IOException   */  @Test  public void create() throws IOException {    //文件夹    Path path = Paths.get("/Users/kingboy/Desktop/hello");    if(!Files.exists(path)){      Files.createDirectory(path);      //创建多个目录      //Files.createDirectories(path);    }    //文件    Path path1 = Paths.get("/Users/kingboy/Desktop/helloFile");    if(Files.exists(path1)){      Files.createFile(path1);    }  }  /**   * 文件属性   */  @Test  public void getFileProperties() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/text.txt");    System.out.println(Files.getLastModifiedTime(path));//最后修改时间    System.out.println(Files.getOwner(path));//拥有者    System.out.println(Files.getPosixFilePermissions(path));//权限    System.out.println(Files.size(path));//文件大小  }  /**   * 读取一个文本文件   */  @Test  public void readText() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/text.txt");    //通过bufferedReader读取    BufferedReader bufferedReader = Files.newBufferedReader(path, StandardCharsets.UTF_8);//文件编码    StringBuilder sb = new StringBuilder();    String tempString = null;    while ((tempString = bufferedReader.readLine())!=null){      sb = sb.append(tempString);    }    System.out.println(sb);    //通过Files方法readAllLines    List<String> strings = Files.readAllLines(path);    strings.forEach(s -> System.out.print(s));    //输出结果    //adsfasdfasdfadsfasdfgsdfsdffsdfsdf    //adsfasdfasdfadsfasdfgsdfsdffsdfsdf  }  /**   * 拿到文件输入流   * @throws IOException   */  @Test  public void getInputStream() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/text.txt");    InputStream inputStream = Files.newInputStream(path);  }  /**   * 文件写操作   */  @Test  public void writeFile() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/writeFile");    BufferedWriter bufferedWriter = Files.newBufferedWriter(path);    String str = "write file test";    bufferedWriter.write(str);    bufferedWriter.flush();    bufferedWriter.close();  }  /**   * 遍历一个文件夹   */  @Test  public void traverseDirectory() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/");    Stream<Path> list = Files.list(path);    list.forEach(p -> {      System.out.println(p.getFileName());    });  }  /**   * 遍历文件树   */  @Test  public void traverseTree() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/");    Stream<Path> walk = Files.walk(path);    walk.forEach(path1 -> {//      System.out.println(path1.getRoot());//根目录      System.out.println(path1.getFileName());//文件名//      System.out.println(path1.getParent());//上级目录//      System.out.println(path1.getFileSystem());//文件系统    });    //还有种方式Files.walkFileTree()  }  /**   * 文件复制   */  @Test  public void copyFile() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/text.txt");    Path path2 = Paths.get("/Users/kingboy/Desktop/hello.txt");    Files.copy(path,path2);  }  /**   * 读取权限见上面示例，设置权限   */  @Test  public void writePermission() throws IOException {    Path path = Paths.get("/Users/kingboy/Desktop/text.txt");    Set<PosixFilePermission> permissionSet = new HashSet<>();    permissionSet.add(PosixFilePermission.GROUP_WRITE);    permissionSet.add(PosixFilePermission.OWNER_EXECUTE);    Files.setPosixFilePermissions(path,permissionSet);  }  //还有很多其他操作Api,自己查看方法名，很容易就能分辨出功能。 }