字符流五种读写字符流 BufferedWriter BufferedReader 带缓冲区的字符流

字符流五种读写

 1 package test03;
 2 
 3 import java.io.BufferedReader;
 4 import java.io.BufferedWriter;
 5 import java.io.File;
 6 import java.io.FileNotFoundException;
 7 import java.io.FileReader;
 8 import java.io.FileWriter;
 9 import java.io.IOException;
10 
11 import javax.annotation.processing.Filer;
12 
13 public class CopyfileDemo {
14     public static void main(String[] args) throws Exception {
15         File src = new File("a.txt");
16         File dest = new File("b.txt");
17         copy1(src,dest);
18         copy2(src,dest);
19         copy3(src,dest);
20         copy4(src,dest);
21         copy5(src,dest);
22     }
23     //缓冲区字符流 特殊方法
24     private static void copy5(File src, File dest) throws IOException {
25         // TODO Auto-generated method stub
26         BufferedReader br = new  BufferedReader(new FileReader(src));
27         BufferedWriter bw = new BufferedWriter(new FileWriter(dest));
28         
29         String line = null;
30         while((line  = br.readLine())!=null) {//一次读一行
31             bw.write(line);
32             bw.newLine();//换行
33         }
34         br.close();
35         bw.close();
36         
37     }
38     //带缓冲区字符流一次一个字符数组
39     private static void copy4(File src, File dest) throws IOException {
40         // TODO Auto-generated method stub
41         BufferedReader br = new  BufferedReader(new FileReader(src));
42         BufferedWriter bw = new BufferedWriter(new FileWriter(dest));
43         int  len = 0;
44         char[] chs = new  char[1024];
45         while((len = br.read(chs))!=-1) {
46             bw.write(chs, 0, len);
47         }
48         br.close();
49         bw.close();
50     }
51     //缓冲区字符流 一次读一个字符
52     private static void copy3(File src, File dest) throws Exception {
53         // TODO Auto-generated method stub
54         BufferedReader br = new  BufferedReader(new FileReader(src));
55         BufferedWriter bw = new BufferedWriter(new FileWriter(dest));
56         
57         int  b = 0;
58         while((b = br.read())!=-1) {
59             bw.write(b);
60         }
61         br.close();
62         bw.close();
63         
64         
65     }
66     //普通字符流 一次读写一个字符数组
67     private static void copy2(File src, File dest) throws IOException {
68         // TODO Auto-generated method stub
69         FileReader fr  =new FileReader(src);
70         FileWriter fw = new FileWriter(dest);
71         
72         int len = 0;
73         char [] chs = new  char[1024];
74         while((len = fr.read(chs))!=-1) {
75             fw.write(chs,0,len);
76         }
77         fr.close();
78         fw.close();
79         
80     }
81     //普通字符流  一次读写一个字符
82     private static void copy1(File src, File dest) throws IOException {
83         // TODO Auto-generated method stub
84         FileReader fr = new FileReader(src);
85         FileWriter fw = new FileWriter(dest);
86         
87         int b = 0;
88         while((b = fr.read())!=-1) {
89             fw.write(b);
90         }
91         
92         fr.close();
93         fw.close();
94         
95         
96     }
97 }

字符流五种读写方式

特殊方法

BufferedReader

String readLine()
读取一个文本行。

 1 public class BufferedReaderDemo2 {
 2     public static void main(String[] args) throws IOException {
 3         BufferedReader br = new BufferedReader(new FileReader("a.txt"));
 4         
 5         //一次读取一行
 6         /*String s = br.readLine();
 7         System.out.println(s);*/
 8         
 9         String line = null;
10         while((line = br.readLine())!=null) {
11             System.out.println(line);
12         }    
13         br.close();
14     }
15 }

BufferedWriter

void newLine()
写入一个行分隔符。

public static void main(String[] args) throws IOException {
        BufferedWriter bw = new  BufferedWriter(new FileWriter("a.txt"));
        bw.write(97);
        bw.write("helloword");
        bw.write("
");//换行符
        bw.newLine();//换行
        
        char[] ch = {'1','2','u','g','h','d'};
        bw.write(ch);
        bw.newLine();//换行
        
        bw.write("helloword");
        
        bw.close();
    }

字符流五种读写 字符流 BufferedWriter BufferedReader 带缓冲区的字符流

字符流五种读写字符流 BufferedWriter BufferedReader 带缓冲区的字符流