将源文件复制到目标文件Buffered
@Test void copyFile() throws IOException {
File file = new File("D:\\CloudMusic");
File fileout=new File("D:\\aa");
if (!fileout.exists()) {
fileout.mkdirs();
}
File[] files = file.listFiles();
for (File file1 : files) {
//获取到文件名
String name = file1.getName();
File file2 = new File(file, name);
File file3 = new File(fileout, name);
CopeFileToFile(file2,file3);
}
}
public void CopeFileToFile(File file,File newFile) throws IOException {
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(newFile));
//小bug bis.available() 获取字节 如果为0则会死循环
byte[] buffer =null;
if (bis.available()==0) {
buffer=new byte[1024];
}
int i=0;
while ((i = bis.read(buffer)) != -1) {
bos.write(buffer,0,i);
}
bos.flush();
bos.close();
bis.close();
} 读出文件每一行后面加一个*
InputStreamReader isr = new InputStreamReader(new FileInputStream("D://bb.txt"), StandardCharsets.UTF_8);
BufferedReader reader = new BufferedReader(isr);
BufferedWriter writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("D://cc.txt"), StandardCharsets.UTF_8));
byte[] buffer=new byte[2048];
String len="";
while ((len = reader.readLine()) != null) {
writer.write(len+"*\n");
}
isr.close();
//如果不加上这两个其中一个 都不会输送到文件 字符流还是存在高效区中
writer.flush();
writer.close(); 对象序列化
ObjectOutputStream outputStream;
outputStream = new ObjectOutputStream(new FileOutputStream("D:\\cc.txt"));
outputStream.writeObject(new Person("来了老弟"));
outputStream.close();
ObjectInputStream inputStream = new ObjectInputStream(new FileInputStream("D:\\cc.txt"));
System.out.println(inputStream.readObject().toString());
//但是被序列化的类必须要有实现Serializable接口 如果被序列化的类中有 transient（瞬时）修饰则不对其他进行序列化
public class Person implements Serializable {
private transient String name;
public Person() {
}
public Person(String name) {
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return "Person{" +
"name='" + name + '\'' +
'}';
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (!(o instanceof Person)) return false;
Person person = (Person) o;
return Objects.equals(getName(), person.getName());
}
@Override
public int hashCode() {
return Objects.hash(getName());
}
} //字节
PrintStream printStream = new PrintStream("D:\\cc.txt");
printStream.println("hello");
//字符 需要关闭流缓冲区
PrintWriter printWriter = new PrintWriter(new FileWriter("D:\\cc.txt"));
printWriter.println("来了老弟");
printWriter.close(); 利用 commons-io jar包
//Apache 复制文件
FileUtils.copyFile(new File("D:\\CloudMusic\\aa.txt"),new File("D:\\aa\\aa.txt"));
//复制目录
FileUtils.copyDirectoryToDirectory(new File("D:\\CloudMusic"),new File("D:\\v"));