java編程思想 TextFile IO工具類

 

 

package io; import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.IOException; import java.io.PrintWriter; import java.util.ArrayList; import java.util.Arrays; import java.util.TreeSet; public class TextFile extends ArrayList<String>{ //讀取文件，返回 String
    public static String read(String fileName){ StringBuilder sb =new StringBuilder(); try { BufferedReader in = new BufferedReader( new FileReader( new File(fileName).getAbsoluteFile())); try { String s ; //BufferedReader.readLine() 若是已到達流末尾，則返回 null 
                while ( (s = in.readLine())!= null ) { sb.append(s); sb.append("\n"); //要本身加上回車
 } } finally { in.close(); } } catch (IOException e) { throw new RuntimeException(); } return sb.toString(); }//read //往文件寫入 text
    public static void write(String fileName,String text){ try { PrintWriter out = new PrintWriter (new File(fileName).getAbsoluteFile()); try { out.print(text); } finally { out.close(); } } catch (IOException e) { throw new RuntimeException(); } }//write //構造器
    public TextFile(String fileName,String splitter) { super(Arrays.asList( read(fileName).split(splitter))) ; if (get(0).equals("")) { remove(0); } } public TextFile(String fileName ) { this(fileName, "\n");//以換行號切分
 } //複製文件 寫入到 文件
    public void write(String fileName){ try { PrintWriter out = new PrintWriter(new File(fileName).getAbsoluteFile()); try { for (String item : this) { out.print(item); } } finally { out.close(); } } catch (FileNotFoundException e) { throw new RuntimeException(e); } }//write
    
    
    public static void main(String[] args) { String pa = "D:\\dev2\\workspace\\seehope\\bigwork\\src\\com\\ColorChoseListener.java"; String path2 = "D:\\dev2\\workspace\\seehope\\bigwork\\src\\io\\TextFile.java"; String file = read(pa); write("test.txt", file); TextFile text = new TextFile("test.txt" ); //以換行號切分
 TreeSet<String> words = new TreeSet<String>(new TextFile("src\\io\\TextFile.java" , "\\W+")); /*TreeSet<String> words = new TreeSet<String>(new TextFile(path2, "\\W+")); 非詞符號切分 , 1. 寫完整路徑 D:\\xx\\xx\\xx\\bigwork\\src\\io\\TextFile.java 2.相對於此項目（bigwork）的路徑（src\io\xxx.java） */
        
        
        // 字母開頭的 碼值小於 H 
        for (String string : words.headSet("H")) { System.out.println(string); } } }

 

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