Java 21-3 character input stream

The so-called input stream is to read the data in the file

Similarly, the character input stream InputStreamReader

4 Construction methods, but 2 are more commonly used:

Construction Method:　

A:inputstreamreader (InputStream is): reads data with default encoding
B:inputstreamreader (InputStream is,string charsetname): reads data with the specified encoding

A:inputstreamreader (InputStream is): reads data with default encoding

InputStreamReader ISR = new InputStreamReader (New FileInputStream ("A.txt"));

　　

B:inputstreamreader (InputStream is,string charsetname): reads data with the specified encoding

1 New InputStreamReader (new  fileinputstream (2                 "Osw.txt"), "UTF-8");

Methods of InputStreamReader:

A * int read (): reads one character at a time
b* int Read (char[] CHS): reads one character array at a time

A * int read (): reads one character at a time

1         int ch = 0; 2          while (ch = isr.read ())! =-1) {3             System.out.print ((char) ch); 4         }56         //  release Resources 7         isr.close ();

b* int Read (char[] CHS): reads one character array at a time

1        Char[] CHS =New Char[1024];2         intLen = 0;3          while(len = Isr.read (CHS))! =-1) {4System.out.print (NewString (CHS, 0, Len));5         }6 7         //Freeing Resources8Isr.close ();

Java 21-3 character input stream