java数据流

Posted 2020-07-26 薄灬荷

字节流

 1 package com.lovo.test;
 2 
 3 import java.io.FileInputStream;
 4 import java.io.FileNotFoundException;
 5 import java.io.FileOutputStream;
 6 import java.io.IOException;
 7 import java.io.InputStream;
 8 import java.io.OutputStream;
 9 
10 public class TestByteStream {
11 
12     public static void main(String[] args) {
13         // TODO Auto-generated method stub
14         //1、字节流
15         //声明流
16         InputStream in = null;
17         OutputStream out = null;
18         try {
19             //创建流
20             in = new FileInputStream("D:" + System.getProperty("file.separator") + "lileihanmeimei.mp3");
21             out = new FileOutputStream("E:" + System.getProperty("file.separator") + "j124.mp3");
22             
23             //操作流
24 //            int b = 0;
25 //            while((b = in.read()) != -1){
26 //                out.write(b);
27 //            }
28             
29             byte[] b = new byte[1024];
30             int length = 0;
31             while((length = in.read(b)) != -1){
32                 out.write(b,0,length);
33                 out.flush();//冲刷
34             }
35             
36             
37         } catch (FileNotFoundException e) {
38             // TODO Auto-generated catch block
39             e.printStackTrace();
40         } catch (IOException e) {
41             // TODO Auto-generated catch block
42             e.printStackTrace();
43         } finally{
44             //关闭流
45             if(in != null){
46                 try {
47                     in.close();
48                 } catch (IOException e) {
49                     // TODO Auto-generated catch block
50                     e.printStackTrace();
51                 }
52             }
53             if(out != null){
54                 try {
55                     out.close();
56                 } catch (IOException e) {
57                     // TODO Auto-generated catch block
58                     e.printStackTrace();
59                 }
60             }
61         }
62         
63     }
64 
65 }

字符流：步骤和上面一样

 1 package com.lovo.test;
 2 
 3 import java.io.FileNotFoundException;
 4 import java.io.FileReader;
 5 import java.io.FileWriter;
 6 import java.io.IOException;
 7 import java.io.Reader;
 8 import java.io.Writer;
 9 
10 import javax.swing.JOptionPane;
11 
12 public class TestCharStream {
13 
14     public static void main(String[] args) {
15         // TODO Auto-generated method stub
16         
17 //        String msg = JOptionPane.showInputDialog("请输入‘白日依山尽’的下一句：");
18 //        
19 //        Writer w = null;
20 //        
21 //        try {
22 //            w = new FileWriter("poem.txt");
23 //            char[] b = msg.toCharArray();
24 //            w.write(b);
25 //            w.flush();
26 //        } catch (IOException e) {
27 //            // TODO Auto-generated catch block
28 //            e.printStackTrace();
29 //        } finally{
30 //            if(w != null){
31 //                try {
32 //                    w.close();
33 //                } catch (IOException e) {
34 //                    // TODO Auto-generated catch block
35 //                    e.printStackTrace();
36 //                }
37 //            }
38 //        }
39         
40         
41         Reader r = null;        
42         try {
43             String result = "";
44             r = new FileReader("poem.txt");
45             char[] c = new char[10];
46             int length = 0;
47             while((length = r.read(c)) != -1){
48                 String str = new String(c, 0, length);
49                 result += str;
50             }
51             System.out.println(result);
52             
53         } catch (FileNotFoundException e) {
54             // TODO Auto-generated catch block
55             e.printStackTrace();
56         } catch (IOException e) {
57             // TODO Auto-generated catch block
58             e.printStackTrace();
59         }finally{
60             if(r != null){
61                 try {
62                     r.close();
63                 } catch (IOException e) {
64                     // TODO Auto-generated catch block
65                     e.printStackTrace();
66                 }
67             }
68         }
69     }
70 }