Beyond the Basics - TCP/IP Sockets in Java Practical Guide for Programmers - page 66

writeEntry() logs the given string or object collection. How it is logged depends on the
implementation. One possibility is to send the log messages to the console.

ConsoleLogger.java

0 import java.util.*; // for Collection and Iterator
1
2 class ConsoleLogger implements Logger {
3

public synchronized void writeEntry(Collection entry) {

4

for (Iterator line = entry.iterator(); line.hasNext();)

5

System.out.println(line.next());

6 System.out.println();

7 }

8
9 public synchronized void writeEntry(String entry) {

10 System.out.println(entry);

11 System.out.println();

12 }

13 }

ConsoleLogger.java

Another possibility is to write the log messages to a file specified in the constructor, as
in the following:

FileLogger.java

0 import java.io.*; // for PrintWriter and FileWriter
1 import java.util.*; // for Collection and Iterator
2
3 class FileLogger implements Logger {
4
5 PrintWriter out; // Log file

6
7

public FileLogger(String filename) throws IOException {

8 out = new PrintWriter(new FileWriter(filename), true); // Create log file

9 }

10
11

public synchronized void writeEntry(Collection entry) {

12

for (Iterator line = entry.iterator(); line.hasNext();)

13

out.println(line.next());

14

out.println();

15

}

16