Java基础知识➣Stream整理(二)

概述

  在Java数据流用到的流包括(Stream)、文件(File流)和I/O流 ,利用该三个流操作数据的传输。

Java控制台输入输出流

 读取控制台使用数据流: BufferedReader和InputStreamReader

 输出控制台使用数据流: PrintStream 常用封装了System.out.println()、System.out.Write()

public static void ReadLine()
{
try{
System.out.println("请输入内容:");
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
String Result="";
do{
Result= br.readLine();
System.out.println("接受的内容:"+Result);
}
while(!Result.toUpperCase().equals("END"));
}
catch(Exception ex)
{
System.out.println(ex.getMessage());
}
}

读写文件操作用到流

  读取文件使用流 FileInputStream、InputStream 、File、FileReader 常用属性 close()、finalize()、read()、available()

  写入文件使用流 FileOutputStream 、OutputStream、File、FileWrite 使用属性close()、finalize()、write()

  public static void FileOpeart()
{
try{
String MyWork="Hello Java ,你好啊!";
byte[] bwiret=MyWork.getBytes();//{11,21,3,40,5};
OutputStream os=new FileOutputStream("c://MyBoo.txt");
// for(int x=0;x<bwiret.length;x++)
// {
// os.write(bwiret[x]);
// }
os.write(bwiret,,bwiret.length);
os.close(); InputStream ReadOS=new FileInputStream("c://MyBoo.txt");
int size=ReadOS.available(); byte[] OutByte=new byte[size];
ReadOS.read(OutByte, , size);
ReadOS.close();
String stm=new String(OutByte);
System.out.println(stm); }
catch(IOException ex)
{
System.out.println("Error"+ex.getMessage());
}
}

  可使用流OutputStreamWriter和OutputStreamWriter来读写文件

public static void FileOpeartWirte()
{
try{
String MyWork="Hello Java ,你好啊!";
byte[] bwiret=MyWork.getBytes();//{11,21,3,40,5};
OutputStream os=new FileOutputStream("c://MyBoo.txt");
OutputStreamWriter WStream=new OutputStreamWriter(os,"utf-8");
WStream.append("大家好!");
WStream.append("\r\n");
//换行
WStream.append("English");
WStream.close();
os.close();
InputStream ReadOS=new FileInputStream("c://MyBoo.txt");
// int size=ReadOS.available();
//
// byte[] OutByte=new byte[size];
// ReadOS.read(OutByte, 0, size);
// ReadOS.close();
// String stm=new String(OutByte,"utf-8");
// System.out.println(stm);
InputStreamReader reader=new InputStreamReader(ReadOS,"utf-8");
StringBuffer sb = new StringBuffer();
while (reader.ready()) {
sb.append((char) reader.read());
// 转成char加到StringBuffer对象中
}
System.out.println(sb.toString());
reader.close();
// 关闭读取流
ReadOS.close();
// 关闭输入流,释放系统资源
}
catch(IOException ex)
{
System.out.println("Error"+ex.getMessage());
}
}

Java中的目录的操作

  创建目录mkdir( )方法创建一个文件夹、kdirs()方法创建一个文件夹和它的所有父文件夹;

  读取目录:isDirectory() 判断是否目录, list() 方法,来提取它包含的文件和文件夹的列表;

public static void FileMKDir()
{
try{
String Path="c:/tmp/user/java";
File d=new File(Path);
boolean res= d.mkdirs(); String dirname="c:/tmp";
File dt=new File(dirname);
if(dt.isDirectory())
{
System.out.println("目录:"+dirname);
String[] st=dt.list();
for(String sr:st)
{
File ft=new File(dirname+"/"+sr);
if(ft.isDirectory())
{
System.out.println("目录"+dirname+"/"+sr);
}
else
{
System.out.println("文件"+dirname+"/"+sr);
}
}
}
}
catch(Exception ex)
{
System.out.println("Err:"+ex.getMessage());
}
}
上一篇:ZooKeeper - Perl bindings for Apache ZooKeeper Perl绑定用于 Apache ZooKeeper


下一篇:java.lang.IllegalStateException: getWriter() has already been called for this response