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package test
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.LineNumberReader;
public class ReadSelectedLine{
// ¶ÁÈ¡ÎļþÖ¸¶¨ÐС£
static void readAppointedLineNumber(File sourceFile, int lineNumber)
throws IOException {
FileReader in = new FileReader(sourceFile);
LineNumberReader reader = new LineNumberReader(in);
String s = "";
if (lineNumber <= 0 || lineNumber > getTotalLines(sourceFile)) {
System.out.println("²»ÔÚÎļþµÄÐÐÊý·¶Î§(1ÖÁ×ÜÐÐÊý)Ö®ÄÚ¡£");
System.exit(0);
}
int lines = 0;
while (s != null) {
lines++;
s = reader.readLine();
if((lines - lineNumber) == 0) {
System.out.println(s);
System.exit(0);
}
}
reader.close();
in.close();
}
// ÎļþÄÚÈݵÄ×ÜÐÐÊý¡£
static int getTotalLines(File file) throws IOException {
FileReader in = new FileReader(file);
LineNumberReader reader = new LineNumberReader(in);
String s = reader.readLine();
int lines = 0;
while (s != null) {
lines++;
s = reader.readLine();
}
reader.close();
in.close();
return lines;
}

/**
* ¶ÁÈ¡ÎļþÖ¸¶¨ÐС£
*/
public static void main(String[] args) throws IOException {
// Ö¸¶¨¶ÁÈ¡µÄÐкÅ
int lineNumber = 2;
// ¶ÁÈ¡Îļþ
File sourceFile = new File("D:/java/test.txt");
// ¶Áȡָ¶¨µÄÐÐ
readAppointedLineNumber(sourceFile, lineNumber);
// »ñÈ¡ÎļþµÄÄÚÈݵÄ×ÜÐÐÊý
System.out.println(getTotalLines(sourceFile));
}
}


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javaʹÓÃrocksawºÍvserv tcpipʵÏÖ»ùÓÚICMPµÄPing¹¦ÄÜ

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 1.  rocksaw-1.0.0-src.tar.gz
 2.  vserv-tcpip-0.9.2-src.tar.gz
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 1.  build vserv-tcpip-0.9.2-src
      ÔÚvserv-tcpip-0.9.2Ŀ¼ÏÂÃæ½¨Ò»¸ötestsĿ¼£¬È»ºóÔÚcmd´°¿ÚϽøÈë ......

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Java IO °üÖеÄDecoratorģʽ

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¡¡¡¡Decoratorģʽ¼ò½é
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JAVA½ØÆÁ³ÌÐò(µÚ¶þ°æ)

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/*
 * CaptureScreen.java
 *
 * Created on 2007Äê8ÔÂ30ÈÕ, ÏÂÎç12:46
 *
 * To change this template, choose Tools | Template Manager
 * and open the template in the editor.
 */
package hadeslee.swing;
/**
 *
 * @author lbf
 * ......
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