net.mindview.util.TextFile 类 java编程思想

                     1
                    //
                    : net/mindview/util/TextFile.java  

                     2
                    //
                     Static functions for reading and writing text files as  

                     3
                    //
                     a single string, and treating a file as an ArrayList.  
                     4
                    package
                     net.mindview.util;  

                     5
                    import java.io.*;  
 6import java.util.*;  
 7 8publicclass TextFile extends ArrayList<String> {  
 9// Read a file as a single string:  10publicstatic String read(String fileName) {  
11         StringBuilder sb = new StringBuilder();  
12try {  
13           BufferedReader in= new BufferedReader(new FileReader(  
14new File(fileName).getAbsoluteFile()));  
15try {  
16            String s;  
17while((s = in.readLine()) != null) {  
18              sb.append(s);  
19               sb.append("\n");//???难道读出来的不包括这一个吗？  20            }  
21           } finally {  
22            in.close();  
23          }  
24         } catch(IOException e) {  
25thrownew RuntimeException(e);  
26        }  
27return sb.toString();  
28      }  
29// Write a single file in one method call:  30publicstaticvoid write(String fileName, String text) {  
31try {  
32           PrintWriter out = new PrintWriter(  
33new File(fileName).getAbsoluteFile());  
34try {  
35            out.print(text);  
36           } finally {  
37            out.close();  
38          }  
39         } catch(IOException e) {  
40thrownew RuntimeException(e);  
41        }  
42      }  
43// Read a file, split by any regular expression:  44public TextFile(String fileName, String splitter) {  
45super(Arrays.asList(read(fileName).split(splitter)));  
46// Regular expression split() often leaves an empty  
47// String at the first position:  48if(get(0).equals("")) remove(0);  
49      }  
50// Normally read by lines:  51public TextFile(String fileName) {  
52this(fileName, "\n");  
53      }  
54publicvoid write(String fileName) {  
55try {  
56           PrintWriter out = new PrintWriter(  
57new File(fileName).getAbsoluteFile());  
58try {  
59for(String item : this)  
60              out.println(item);  
61           } finally {  
62            out.close();  
63          }  
64         } catch(IOException e) {  
65thrownew RuntimeException(e);  
66        }  
67      }  
68// Simple test:  69publicstaticvoid main(String[] args) {  
70         String file = read("TextFile.java");  
71         write("test.txt", file);  
72         TextFile text = new TextFile("test.txt");  
73         text.write("test2.txt");  
74// Break into unique sorted list of words:  75         TreeSet<String> words = new TreeSet<String>(  
76new TextFile("TextFile.java", "\\W+"));  
77// Display the capitalized words:  78         System.out.println(words.headSet("a"));  
79      }  
80     } /* Output: 
81    [0, ArrayList, Arrays, Break, BufferedReader, BufferedWriter, Clean, Display, File, FileReader, FileWriter, IOException, Normally, Output, PrintWriter, Read, Regular, RuntimeException, Simple, Static, String, StringBuilder, System, TextFile, Tools, TreeSet, W, Write] 
82*///:~