[Java] Java中byte输出write到文件的实现方法讲解

package testchar;
import java.io.file;
import java.io.filenotfoundexception;
import java.io.fileoutputstream;
import java.io.ioexception;
public class testchar {
 public static void main(string[] args){
 file outputfile = new file("output.txt");
 fileoutputstream outputfilestream = null;
 // try to open file output.txt
 try {
  outputfilestream = new fileoutputstream(outputfile);
 } catch (filenotfoundexception e) {
  e.printstacktrace();
 }
 //output to output.txt 
 for(int i = 33;i < 127;i++){
  try {
  string numstr = i + ": ";
  byte[] numbytes = numstr.getbytes("utf-8");
  outputfilestream.write(numbytes);
  //i lies in [33, 127)
  outputfilestream.write(i);
  outputfilestream.write("\n".getbytes());
  } catch (ioexception e1) {
  e1.printstacktrace();
  }
 }
 //close file stream
 try {
  outputfilestream.close();
 } catch (ioexception e) {
  e.printstacktrace();
 }
 }
}

33:   !
34:   "
35:   #
36:   $
37:   %
38:   &
39:   '
40:   (
41:   )
42:   *
43:   +
44:   ,
45:   -
46:   .
47:   /
48:   0
49:   1
50:   2
51:   3
52:   4
53:   5
54:   6
55:   7
56:   8
57:   9
58:   :
59:   ;
60:   <
61:   =
62:   >
63:   ?
64:   @
65:   a
66:   b
67:   c
68:   d
69:   e
70:   f
71:   g
72:   h
73:   i
74:   j
75:   k
76:   l
77:   m
78:   n
79:   o
80:   p
81:   q
82:   r
83:   s
84:   t
85:   u
86:   v
87:   w
88:   x
89:   y
90:   z
91:   [
92:   \
93:   ]
94:   ^
95:   _
96:   `
97:   a
98:   b
99:   c
100:   d
101:   e
102:   f
103:   g
104:   h
105:   i
106:   j
107:   k
108:   l
109:   m
110:   n
111:   o
112:   p
113:   q
114:   r
115:   s
116:   t
117:   u
118:   v
119:   w
120:   x
121:   y
122:   z
123:   {
124:   |
125:   }
126:   ~