【java】内存流：java.io.ByteArrayInputStream、java.io.ByteArrayOutputStream、java.io.CharArrayReader、java.io.CharArrayWriter

 1 package 内存流;
 2 
 3 import java.io.ByteArrayInputStream;
 4 import java.io.ByteArrayOutputStream;
 5 import java.io.IOException;
 6 import java.io.InputStream;
 7 import java.io.OutputStream;
 8 
 9 public class Test {
10     public static void main(String[] args) throws IOException {
11         String str="Hello World!中国好国国国。";
12         InputStream in=new ByteArrayInputStream(str.getBytes());
13         OutputStream out=new ByteArrayOutputStream();
14         int tmp=0;
15         while((tmp=in.read())!=-1)
16             out.write(Character.toUpperCase(tmp));
17         System.out.println(out);//HELLO WORLD!中冠好冠冠冠。
18         //中文有乱码！！！
19         in.close();
20         out.close();
21     }
22 }

字节数组字节输入输出内存流

 1 package 内存流;
 2 
 3 import java.io.CharArrayReader;
 4 import java.io.CharArrayWriter;
 5 import java.io.IOException;
 6 import java.io.Reader;
 7 import java.io.Writer;
 8 
 9 public class Test {
10     public static void main(String[] args) throws IOException {
11         String str="Hello World!中国好国国国。";
12         Reader in=new CharArrayReader(str.toCharArray());
13         Writer out=new CharArrayWriter();
14         int tmp=0;
15         while((tmp=in.read())!=-1)
16             out.write(Character.toUpperCase(tmp));
17         System.out.println(out);//HELLO WORLD!中国好国国国。
18         //字符流处理中文无乱码！！！
19         in.close();
20         out.close();
21     }
22 }

字符数组字符输入输出内存流

 1 package 内存流;
 2 
 3 import java.io.*;
 4 
 5 public class Test {
 6     public static void main(String[] args) throws IOException {
 7         File[] files={
 8                 new File("D:"+File.separator+"testA.txt"),
 9                 new File("D:"+File.separator+"testB.txt"),
10         };
11         Reader[] ins={
12                     new FileReader(files[0]),
13                     new FileReader(files[1])
14         };
15         Writer out=new CharArrayWriter();
16         int tmp=0;
17         while((tmp=ins[0].read())!=-1)
18             out.write(tmp);
19         while((tmp=ins[1].read())!=-1)
20             out.write(tmp);
21         System.out.println(out.toString());
22 //        System.out.println(new String(out.toCharArray()));
23         //字节内存输出流ByteArrayOutputStream下有个类似的toByteArray()方法
24         ins[0].close();
25         ins[1].close();
26         out.close();
27     }
28 }

将多个文件读入到同一个内存输出流