字符缓冲流BufferedWriter和BufferedWriter

 1 import java.io.BufferedReader;
 2 import java.io.BufferedWriter;
 3 import java.io.FileReader;
 4 import java.io.FileWriter;
 5 import java.io.IOException;
 6 
 7 /**
 8  * BufferedWriter:将文本写入字符输出流，缓冲各个字符，从而提供单个字符、数组和字符串的高效写入。
 9  * BufferedWriter:从字符输入流中读取文本，缓冲各个字符，从而实现字符、数组和行的高效读取。
10  * @author Administrator
11  *
12  */
13 public class BufferedStreamDemo {
14     public static void main(String[] args) throws IOException {
15         //创建缓冲流对象
16         BufferedWriter bw=new BufferedWriter(new FileWriter("C:\\Test\\bw.txt"));
17         bw.write("hello");
18         //bw.flush();
19         bw.close();
20         
21         //一次读取一个字符
22         //创建输入缓冲流对象
23         BufferedReader br=new BufferedReader(new FileReader("C:\\Test\\bw.txt"));
24         int ch;
25         while((ch=br.read())!=-1) {
26             System.out.print((char)ch);
27         }
28         br.close();
29         System.out.println();
30         //一次读取一个字符数组
31         BufferedReader br2=new BufferedReader(new FileReader("C:\\Test\\bw.txt"));
32         int len=0;
33         char chs[]=new char[1024];
34         while((len=br2.read(chs))!=-1) {
35             System.out.print(new String(chs,0,len));
36         }
37         br2.close();
38     }
39 }

 1 import java.io.BufferedReader;
 2 import java.io.BufferedWriter;
 3 import java.io.FileReader;
 4 import java.io.FileWriter;
 5 import java.io.IOException;
 6 
 7 /**
 8  * 需求：把项目路径下的BufferedStreamCopy.java中的内容复制到项目路径下的copy.java中
 9  * @author Administrator
10  *
11  */
12 public class BufferedStreamCopy {
13     public static void main(String[] args) throws IOException {
14         BufferedReader br=new BufferedReader(new FileReader("BufferedStreamCopy.java"));
15         BufferedWriter bw=new BufferedWriter(new FileWriter("copy.java"));
16          //第一种方式，一次读取一个字符
17 //        int ch;
18 //        while((ch=br.read())!=-1) {
19 //            bw.write(ch);
20 //        }
21         
22          //第二种方式，一次读取一个字符数组
23         int len;
24         char[] chs=new char[1024];
25         while((len=br.read(chs))!=-1) {
26             bw.write(chs,0,len);
27         }
28     
29         br.close();
30         bw.close();
31         
32     }
33 }

 1 import java.io.BufferedReader;
 2 import java.io.BufferedWriter;
 3 import java.io.FileReader;
 4 import java.io.FileWriter;
 5 import java.io.IOException;
 6 
 7 /**
 8  * 需求：把项目路径下的BufferedStreamCopy.java中的内容复制到项目路径下的copy.java中
 9  * @author Administrator
10  *
11  */
12 public class BufferedStreamCopy {
13     public static void main(String[] args) throws IOException {
14         BufferedReader br=new BufferedReader(new FileReader("copy1.java"));
15         BufferedWriter bw=new BufferedWriter(new FileWriter("copy2.java"));
16         String str;
17         while((str=br.readLine())!=null) {
18             bw.write(str);
19             bw.newLine();
20         }
21         br.close();
22         bw.close();
23         
24         BufferedReader brshow=new BufferedReader(new FileReader("copy2.java"));
25         String str2;
26         while((str2=brshow.readLine())!=null) {
27             System.out.println(str2);
28         }        
29         brshow.close();
30         
31     }
32 }