Java6学习笔记45——JAVA中的打印文本

import javax.swing.JFrame;
import javax.swing.JTextArea;
import java.awt.print.PrinterException;
import java.awt.Container;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;

public class PrintDemo1 extends JFrame {
JTextArea textarea;
String text = "This is the text that is to\n" +
"be displayed by, and printed from,\n" +
"the text component.";
public static void main(String arg[]) {
PrintDemo1 demo = new PrintDemo1();
demo.printText();
}
PrintDemo1() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
} );

Container pane = getContentPane();

textarea = new JTextArea(text,5,32); //其中有print()方法
pane.add(textarea);

pack();
setLocation(250,150);
setVisible(true);
}
public void printText() {
boolean complete = false;
try {
complete = textarea.print();
} catch(PrinterException e ) {//注意这个异常的捕获
System.out.println("Print failed.");
System.out.println(e);
return;
}
if(complete)
System.out.println("Print complete");
else
System.out.println("Print cancelled");
}
}

我们还可以在打印前加上附加信息：

import javax.swing.JFrame;
import javax.swing.JTextArea;
import java.awt.print.PrinterException;
import java.awt.Container;
import java.text.MessageFormat;
import java.util.Date;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;

public class PrintDemo2 extends JFrame {
JTextArea textarea;
String text = "This is the text that is to\n" +
"be displayed by, and printed from,\n" +
"the text component.";
public static void main(String arg[]) {
PrintDemo2 demo = new PrintDemo2();
demo.printText();
}
PrintDemo2() {
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
} );

Container pane = getContentPane();

textarea = new JTextArea(text,5,32);
pane.add(textarea);

pack();
setLocation(250,150);
setVisible(true);
}
public void printText() {
boolean complete = false;
String fmt;

Date d = new Date();
fmt = MessageFormat.format("The text header on {0,date}",d);
MessageFormat header = new MessageFormat(fmt);

try {
complete = textarea.print(header,null);
} catch(PrinterException e) {
System.out.println("Print failed.");
System.out.println(e);
return;
}
if(complete)
System.out.println("Print complete");
else
System.out.println("Print cancelled");
}
}