先贴一下我在作业中用到的三种文件输入辅助类、三种文件输出辅助类
public class BuffIn implements InHelp{
private BufferedReader bufferedReader;
public BuffIn(String path) {
try {
bufferedReader = new BufferedReader(
new InputStreamReader(new FileInputStream(path), "UTF-8"));
}catch (IOException e){
System.err.println("请提供正确路径");
PathException e2 = new PathException(path,"路径地址错误");
Logs.logger.error(e2.getMessage());
}
}
@Override
public String read() throws IOException {
TimeCounter.start();
String s = bufferedReader.readLine();
TimeCounter.pause();
return s;
}
@Override
public void shut() throws IOException {
bufferedReader.close();
}
}
public class BuffreaderIn implements InHelp{
private BufferedReader bufferedReader;
public BuffreaderIn(String path) {
try {
bufferedReader = new BufferedReader(new FileReader(path));
}catch (IOException e){
System.err.println("请提供正确路径");
PathException e2 = new PathException(path,"路径地址错误");
Logs.logger.error(e2.getMessage());
}
}
@Override
public String read() throws IOException {
TimeCounter.start();
String s = bufferedReader.readLine();
TimeCounter.pause();
return s;
}
@Override
public void shut() throws IOException {
bufferedReader.close();
}
}
public class ScannerIn implements InHelp{
private Scanner scanner;
private java.io.File file;
public ScannerIn(String path) {
try {
file = new java.io.File(path);
scanner = new Scanner(file);
}catch (IOException e){
System.err.println("请提供正确路径");
exception.PathException e2 = new exception.PathException(path,"路径地址错误");
logs.Logs.logger.error(e2.getMessage());
}
}
@Override
public String read() throws IOException {
TimeCounter.start();
if(!scanner.hasNextLine()) return null;
String s = scanner.nextLine();
TimeCounter.pause();
return s;
}
@Override
public void shut() throws IOException {
scanner.close();
}
}public class BuffOut implements OutHelp{
private BufferedWriter bufferedWriter;
private FileOutputStream fileOutputStream;
public BuffOut(String path) {
try {
fileOutputStream = new FileOutputStream(path);
bufferedWriter = new BufferedWriter(
new OutputStreamWriter(fileOutputStream, "UTF-8"));
}catch (IOException e){
System.err.println("请提供正确路径");
PathException e2 = new PathException(path,"路径地址错误");
Logs.logger.error(e2.getMessage());
}
}
@Override
public void write(String s) throws IOException {
TimeCounter.start();
bufferedWriter.write(s);
TimeCounter.pause();
}
@Override
public void shut() throws IOException {
bufferedWriter.close();
fileOutputStream.close();
}
}
public class StreamOut implements OutHelp{
private OutputStreamWriter outputStreamWriter;
private FileOutputStream fileOutputStream;
public StreamOut(String path) {
try {
fileOutputStream = new FileOutputStream(path);
outputStreamWriter = new OutputStreamWriter(fileOutputStream, "UTF-8");
}catch (IOException e){
System.err.println("请提供正确路径");
PathException e2 = new PathException(path,"路径地址错误");
Logs.logger.error(e2.getMessage());
}
}
@Override
public void write(String s) throws IOException {
TimeCounter.start();
outputStreamWriter.write(s);
TimeCounter.pause();
}
@Override
public void shut() throws IOException {
outputStreamWriter.close();
fileOutputStream.close();
}
}
public class WriterOut implements OutHelp {
private FileWriter fileWriter;
public WriterOut(String path) {
try {
fileWriter = new FileWriter(path);
}catch (IOException e){
System.err.println("请提供正确路径");
PathException e2 = new PathException(path,"路径地址错误");
Logs.logger.error(e2.getMessage());
}
}
@Override
public void write(String s) throws IOException {
TimeCounter.start();
fileWriter.write(s);
TimeCounter.pause();
}
@Override
public void shut() throws IOException {
fileWriter.close();
}
}主要的类如下：
1. File（文件特征与管理）：用于文件或者目录的描述信息，例如生成新目录，修改文件名，删除文件，判断文件所在路径等。
2. InputStream（二进制格式操作）：抽象类，基于字节的输入操作，是所有输入流的父类。定义了所有输入流都具有的共同特征。
3. OutputStream（二进制格式操作）：抽象类。基于字节的输出操作。是所有输出流的父类。定义了所有输出流都具有的共同特征。
4.Reader（文件格式操作）：抽象类，基于字符的输入操作。
5. Writer（文件格式操作）：抽象类，基于字符的输出操作。
6. RandomAccessFile（随机文件操作）：一个独立的类，直接继承至Object.它的功能丰富，可以从文件的任意位置进行存取（输入输出）操作。
针对一些频繁的设备交互，Java语言系统预定了3个可以直接使用的流对象，分别是：
· System.in（标准输入），通常代表键盘输入。
· System.out（标准输出）：通常写往显示器。
· System.err（标准错误输出）：通常写往显示器。
IOException异常类的子类
1.public class EOFException ： 非正常到达文件尾或输入流尾时，抛出这种类型的异常。
2.public class FileNotFoundException： 当文件找不到时，抛出的异常。
3.public class InterruptedIOException： 当I/O操作被中断时，抛出这种类型的异常。