java如何使用swing打印jframe？
我有打印账单的要求，这只是一个Jframe，我有两个类
当我点击Generate Bill按钮（来自CreateBill.java类），然后调用另一个类的构造函数，即GridBagLayoutDemo2（int-id），Bill窗口已经显示出来，现在我想在点击print按钮时打印这个Jframe，但我不知道该怎么做
这是我的两门课
比尔。爪哇
class CreateBill extends JPanel implements ActionListener,ItemListener
{
GridBagLayout gbag;
GridBagConstraints cons;
DefaultTableModel model;
static JTable table;
String columnNames [] ={"Sr.No","Particulars","Item Price","Quantity","Amount"};
JComboBox box1,box2,box3,box4,box5,box6,box7;
JButton b1,b2,b3,b4,b5,b6,b7;
String ids,ids1,ids2,ids3,ids4,str1,str2,str3,str4,y;
Vector v1,v2,v3,v4,v5;
Connection con;
Statement stmt;
String vegitm,yourdate;
PreparedStatement ps,ps1,ps2,ps3,ps4;
ResultSet rs,rs1,rs2,rs3,rs4,gs1,gs2,gs3,gs4,rs5,rs6,rs7,rs8,rs9;
static int p;
Float price,Total=0.0f,res;
JLabel lbl;
int index ,k=0,f=0,id=0;
public CreateBill()
{
lbl = new JLabel();
lbl.setFont(new Font("calibri",Font.BOLD,20));
lbl.setForeground(Color.red);
//create GridBagLayout object
gbag = new GridBagLayout();
//set gridbag layout content pane
setLayout(gbag);
//create GridBagConstraints object
cons = new GridBagConstraints();
try
{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("Jdbc:mysql://localhost:3306/hotel?user=root&password=root");
stmt = con.createStatement();
//fetch names from teleenq table
rs = stmt.executeQuery("select fullname from teleenq");
v1 = new Vector();
while(rs.next())
{
ids = rs.getString(1);
v1.add(ids);
}
box1 = new JComboBox(v1);
//fetch common packages from common_pkg table
rs1 = stmt.executeQuery("select pkgName from common_pkg");
v2 = new Vector();
while(rs1.next())
{
ids1 = rs1.getString(1);
v2.add(ids1);
}
box2 = new JComboBox(v2);
box2.addActionListener(this);
//fetch vegcategories from veg_cat
rs2 = stmt.executeQuery("select * from veg_cat");
v3 = new Vector();
while(rs2.next())
{
ids2 = rs2.getString(1);
v3.add(ids2);
}
box3 = new JComboBox(v3);
box3.addActionListener( new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == box3 )
{
String str1 = (String)box3.getSelectedItem();
System.out.println(str1);
try
{
gs1 = stmt.executeQuery("select veg_itemname from veg_catitems where veg_cat ='" + str1 + "'");
int k=0;
while(gs1.next())
{
k++;
}
String[] strArr = new String[k];
gs1.beforeFirst();
int l=0;
while(gs1.next())
{
vegitm = gs1.getString(1);
strArr[l]= vegitm;
l++;
}
box4.setModel(new DefaultComboBoxModel((String[])strArr));
}
catch(Exception ae)
{
ae.printStackTrace();
}
}
}
});
//for vegcat-items
box4 = new JComboBox();
box4.addItem("select veg-items");
box4.addActionListener(this);
//fetch nonveg category from nonveg_cat
rs3 = stmt.executeQuery("select * from nonveg_cat");
v4 = new Vector();
while(rs3.next())
{
ids3 = rs3.getString(1);
v4.add(ids3);
}
box5 = new JComboBox(v4);
box5.addActionListener(new ActionListener()
{
@Override
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == box5)
{
String str1 = (String)box5.getSelectedItem();
System.out.println(str1);
try
{
gs2 = stmt.executeQuery("select Nonveg_itemname from nonveg_catitems where Nonveg_cat ='" + str1 + "'");
int k=0;
while(gs2.next())
{
k++;
}
String[] strArr = new String[k];
gs2.beforeFirst();
int l=0;
while(gs2.next())
{
vegitm = gs2.getString(1);
strArr[l]= vegitm;
l++;
}
box6.setModel(new DefaultComboBoxModel((String[])strArr));
}
catch(Exception ae)
{
ae.printStackTrace();
}
}
}
});
//for nonveg items
box6 = new JComboBox();
box6.addItem("Select Non-veg items");
box6.addActionListener(this);
box7 = new JComboBox();
// box7.addItem("Select Quantity ");
for(int i=0;i<100;i++)
{
box7.addItem( new Integer(i));
}
box7.addItemListener(this);
}//end of try
catch(Exception e)
{
e.printStackTrace();
}
//create 5 push bottons
b1 = new JButton("ADD Name");
b2 = new JButton("ADD Package");
b2.addActionListener(this);
b3 = new JButton("ADD Veg-items");
b3.addActionListener(this);
b4 = new JButton("ADD Nonveg-items");
b4.addActionListener(this);
//for all buttons , use horizontal filling
cons.fill = GridBagConstraints.FIRST_LINE_START;
//display box1 at x,y cooridnates 0,0
cons.gridx = 0;
cons.gridy = 0;
//set the above constraints to button1
gbag.setConstraints(box1,cons);
//add the button1 to content pane
add(box1);
//display button2 at x,y coordinates 1,0
cons.gridx=1;
cons.gridy =0;
//remaining constatints applicable as set for previous button
//set constraints to button2
gbag.setConstraints(box2, cons);
add(box2);
//display button at x,y coordiantes 2,0
cons.gridx = 2;
cons.gridy = 0;
//remaining constraints applicable as set for previouse button
//set constraints to button3
gbag.setConstraints(box3, cons);
add(box3);
//display button2 at x,y coordinates 1,0
cons.gridx=3;
cons.gridy =0;
//remaining constatints applicable as set for previous button
//set constraints to button2
gbag.setConstraints(box4, cons);
add(box4);
//display button at x,y coordiantes 2,0
cons.gridx = 4;
cons.gridy = 0;
//remaining constraints applicable as set for previouse button
//set constraints to button3
gbag.setConstraints(box5, cons);
add(box5);
cons.gridx=5;
cons.gridy =0;
//remaining constatints applicable as set for previous button
//set constraints to button2
gbag.setConstraints(box6, cons);
add(box6);
//display button at x,y coordiantes 2,0
cons.gridx = 6;
cons.gridy = 0;
//remaining constraints applicable as set for previouse button
//set constraints to button3
gbag.setConstraints(box7, cons);
add(box7);
cons.anchor = GridBagConstraints.LINE_START;
cons.insets = new Insets(10,0,0,0);
//display button 1 at x,y coordinates
cons.gridx = 0;
cons.gridy = 1;
gbag.setConstraints(b1, cons);
b1.addActionListener(this);
add(b1);
//display button 1 at x,y coordinates
cons.gridx = 1;
cons.gridy = 1;
gbag.setConstraints(b2, cons);
add(b2);
//display button 1 at x,y coordinates
cons.gridx = 3;
cons.gridy = 1;
gbag.setConstraints(b3, cons);
add(b3);
//display button 1 at x,y coordinates
cons.gridx = 5;
cons.gridy = 1;
gbag.setConstraints(b4, cons);
add(b4);
model = new DefaultTableModel();
model.setColumnIdentifiers(columnNames);
table = new JTable();
table.setModel(model);
//table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
table.setFillsViewportHeight(true);
JScrollPane sp = new JScrollPane(table);
sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
cons.anchor = GridBagConstraints.CENTER;
//cons.insets = new Insets(10,150,0,0);
cons.gridx = 3;
cons.gridy = 2;
gbag.setConstraints(lbl, cons);
add(lbl);
cons.anchor = GridBagConstraints.LINE_START;
cons.insets = new Insets(20,0,0,0);
cons.gridx = 0;
cons.gridy = 3;
cons.ipady = 50;
cons.ipadx = 450;
cons.gridwidth = 7;
gbag.setConstraints(sp, cons);
add(sp);
cons.anchor = GridBagConstraints.PAGE_END;
b5 = new JButton("Bill Total");
b5.addActionListener(this);
cons.ipady = 0;
cons.ipadx = 0;
cons.gridx = 0;
cons.gridy = 5;
gbag.setConstraints(b5, cons);
add(b5);
b6 = new JButton("Generate Bill");
b6.addActionListener(this);
cons.gridx = 2;
cons.gridy = 5;
gbag.setConstraints(b6, cons);
add(b6);
b7 = new JButton("Cancel Bill");
b7.addActionListener(this);
cons.gridx = 4;
cons.gridy = 5;
gbag.setConstraints(b7, cons);
add(b7);
setVisible(true);
}//close of constructor
@Override
public void itemStateChanged(ItemEvent e)
{
int state = e.getStateChange();
System.out.println("State :"+state);
if(e.SELECTED == state)
{
index = box7.getSelectedIndex();
}
}
@Override
public void actionPerformed(ActionEvent e)
{
try
{
stmt = con.createStatement();
rs9 = stmt.executeQuery("select * from bill_1");
while(rs9.next())
{
id = rs9.getInt(1);
}
}
catch(Exception ae)
{
ae.printStackTrace();
}
String str1 = " ";
if(e.getSource() == b1)
{
String strName = (String)box1.getSelectedItem();
lbl.setText(strName);
DateFormat dateformat = new SimpleDateFormat("yyyy/MM/dd");
Date date = new Date();
yourdate = dateformat.format(date);
try
{
ps = con.prepareStatement("insert into bill_1(cust_name,Bill_date) values(?,?)");
ps.setString(1,strName);
ps.setString(2,yourdate);
ps.executeUpdate();
} catch (SQLException e1)
{
e1.printStackTrace();
}
}
if(e.getSource() == b2)
{
if(index==0)
{
JOptionPane.showMessageDialog(null,"Please select Qunatity");
}
else
{
str1 = (String)box2.getSelectedItem();
System.out.println("status :"+box2.isEnabled() +" "+"String :"+str1);
if(str1.equals(null))
{
JOptionPane.showMessageDialog(null,"Please select Common Package");
}
else
{
try
{
rs5 = stmt.executeQuery("select package_price from common_pkg where pkgName = '"+str1+"'");
Integer o = (Integer)box7.getSelectedItem();
int qty = o.intValue();
while(rs5.next())
{
p++;
price = rs5.getFloat(1);
res = qty * price;
model.addRow(new Object[]{p,str1,price,qty,res});
}
Total+=res;
ps1 =con.prepareStatement("insert into bill_2 values(?,?,?,?,?,?)");
ps1.setInt(1,p);
ps1.setString(2,str1);
ps1.setFloat(3,price);
ps1.setInt(4,qty);
ps1.setFloat(5,res);
ps1.setInt(6,id);
ps1.executeUpdate();
box7.removeAllItems();
for(int i=0;i<100;i++)
{
box7.addItem( new Integer(i));
}
}
catch (SQLException e1)
{
e1.printStackTrace();
}
index = 0;
}
}
}
else if(e.getSource() == b3)
{
String str2 =" ";
if(index==0)
{
JOptionPane.showMessageDialog(null,"Please select Qunatity");
}
else
{
str2 = (String)box4.getSelectedItem();
if(str2.equals(""))
{
JOptionPane.showMessageDialog(null,"Please select Common Package");
}
else
{
if(str2.equals(" "))
{
JOptionPane.showMessageDialog(null,"Please select veg_item");
}
try
{
rs6 = stmt.executeQuery("select veg_itemprice from veg_catitems where veg_itemname = '"+str2+"'");
Integer o = (Integer)box7.getSelectedItem();
int qty = o.intValue();
while(rs6.next())
{
p++;
price = rs6.getFloat(1);
res = qty * price;
model.addRow(new Object[]{p,str2,price,qty,res});
}
Total+=res;
ps1 =con.prepareStatement("insert into bill_2 values(?,?,?,?,?,?)");
ps1.setInt(1,p);
ps1.setString(2,str2);
ps1.setFloat(3,price);
ps1.setInt(4,qty);
ps1.setFloat(5,res);
ps1.setInt(6,id);
ps1.executeUpdate();
box7.removeAllItems();
for(int i=0;i<100;i++)
{
box7.addItem( new Integer(i));
}
}
catch (SQLException e1)
{
e1.printStackTrace();
}
index = 0;
}
}
}
else if(e.getSource() == b4)
{
String str3=" ";
if(index==0)
{
JOptionPane.showMessageDialog(null,"Please select Qunatity");
}
else
{
str3 = (String)box6.getSelectedItem();
if(str3.equals(""))
{
JOptionPane.showMessageDialog(null,"Please select Common Package");
}
else
{
System.out.println("status :"+box6.isEnabled() +" "+"String :"+str2);
try
{
rs7 = stmt.executeQuery("select Nonveg_itemprice from nonveg_catitems where Nonveg_itemname = '"+str3+"'");
Integer o = (Integer)box7.getSelectedItem();
int qty = o.intValue();
while(rs7.next())
{
p++;
price = rs7.getFloat(1);
res = qty * price;
model.addRow(new Object[]{p,str3,price,qty,res});
}
Total+=res;
ps1 =con.prepareStatement("insert into bill_2 values(?,?,?,?,?,?)");
ps1.setInt(1,p);
ps1.setString(2,str3);
ps1.setFloat(3,price);
ps1.setInt(4,qty);
ps1.setFloat(5,res);
ps1.setInt(6,id);
ps1.executeUpdate();
box7.removeAllItems();
for(int i=0;i<100;i++)
{
box7.addItem( new Integer(i));
}
}
catch (SQLException e1)
{
e1.printStackTrace();
}
index = 0;
}
}
}
if(e.getSource() == b5)
{
if(k==0)
{
//int id = 0;
String s1 = " ";
String s2 = "Total";
model.addRow(new Object[]{s1});
model.addRow(new Object[]{null,null,null,s2,Total});
k++;
try
{
/*stmt = con.createStatement();
rs9 = stmt.executeQuery("select * from bill_1");
while(rs9.next())
{
id = rs9.getInt(1);
}*/
String sql = "update bill_1 set Total = '" + Total + "' where Bill_id ='" + id +"'";
stmt.executeUpdate(sql);
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
else
{
JOptionPane.showMessageDialog(null,"Bill is already generated");
}
}
if(e.getSource() == b7)
{
p=0;
while(model.getRowCount()>0)
{
model.removeRow(0);
}
Total=0.0f;
k=0;
}
if(e.getSource() == b6)
{
new GridBagLayoutDemo2(id);
}
}//close action listener
}//close of class
screen shot of CreateBill.java
GridBagLayoutDemo2。爪哇
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.print.PageFormat;
import java.awt.print.Printable;
import java.awt.print.PrinterException;
import java.awt.print.PrinterJob;
import java.sql.Connection;
import java.sql.Date;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
public class GridBagLayoutDemo2 extends JFrame
{
//variables
JFrame frameToPrint;
GridBagLayout gbag;
GridBagConstraints cons;
//variables
JLabel lbl1,lbl2,lbl3,lbl4,lbl5,lbl6,lbl7;
JButton b1;
DefaultTableModel model;
Connection con;
Statement stmt;
String vegitm;
PreparedStatement ps,ps1,ps2,ps3,ps4;
ResultSet rs,rs1,rs2,rs3,rs4,gs1,gs2,gs3,gs4,rs5,rs6,rs7,rs8,rs9;
static int p;
Float price,Total=0.0f,res,ft,Item_price,amt;
JLabel lbl;
int index ,k=0,f=0,srno;
int qty;
String s1,s3,s4,particulars,yourdate;
Date s2;
static JTable table;
String columnNames [] ={"Sr.No","Particulars","Item Price","Quantity","Amount"};
CreateBill c;
public GridBagLayoutDemo2(int id)
{
try
{
Class.forName("com.mysql.jdbc.Driver");
con=DriverManager.getConnection("Jdbc:mysql://localhost:3306/hotel?user=root&password=root");
stmt = con.createStatement();
//fetch names from teleenq table
rs = stmt.executeQuery("select * from bill_1 where Bill_id = '" + id +"'");
while(rs.next())
{
s1 = rs.getString(2);
s2 = rs.getDate(3);
ft = rs.getFloat(4);
}
//get the content pane
Container c = getContentPane();
//create GridBagLayout object
gbag = new GridBagLayout();
//set gridbag layout to content pane
c.setLayout(gbag);
//create GridBagConstaints object
cons = new GridBagConstraints();
//create Components
lbl1 = new JLabel("4 SEASONS CATERERS");
lbl2 = new JLabel("4 Seasons Farmhouse Society Clibhouse, S. No.436/1 to 441,Bhugaon,Pune");
lbl3 = new JLabel("************************ Mob N0 : 9922863031 **************************");
lbl1.setForeground(Color.DARK_GRAY);
lbl1.setFont(new Font("Calibari",Font.BOLD,35));
lbl2.setFont(new Font("Calibari",Font.BOLD,15));
lbl3.setFont(new Font("Calibari",Font.BOLD,15));
lbl4 = new JLabel("Customer Name :- " +s1);
lbl4.setFont(new Font("Calibari",Font.BOLD,20));
lbl5 = new JLabel("Date:- "+s2);
lbl5.setFont(new Font("Calibari",Font.BOLD,10));
lbl6 = new JLabel("Bill No:-"+id);
lbl6.setFont(new Font("Calibari",Font.BOLD,15));
//for table
model = new DefaultTableModel();
model.setColumnIdentifiers(columnNames);
table = new JTable();
table.setModel(model);
table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
table.setFillsViewportHeight(true);
JScrollPane sp = new JScrollPane(table);
sp.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
rs1 = stmt.executeQuery("select * from bill_2 where Bill_id = '" + id +"'");
String empty = " ";
String st = "Total";
while(rs1.next())
{
srno = rs1.getInt(1);
particulars = rs1.getString(2);
Item_price = rs1.getFloat(3);
qty = rs1.getInt(4);
amt = rs1.getFloat(5);
model.addRow(new Object[]{srno,particulars,Item_price,qty,amt});
}
model.addRow(new Object[]{empty});
model.addRow(new Object[]{null,null,null,st,ft});
//for button
b1 = new JButton("PRINT");
b1.addActionListener(new Paction(frameToPrint));
cons.anchor = GridBagConstraints.PAGE_START;
cons.gridx = 5;
cons.gridy = 0;
gbag.setConstraints(lbl1,cons);
c.add(lbl1);
cons.gridx = 5;
cons.gridy = 1;
gbag.setConstraints(lbl2,cons);
c.add(lbl2);
cons.gridx = 5;
cons.gridy = 2;
gbag.setConstraints(lbl3,cons);
c.add(lbl3);
//add 100-px height-wise
cons.ipady = 60;
cons.gridx = 5;
cons.gridy = 7;
gbag.setConstraints(lbl4,cons);
c.add(lbl4);
cons.anchor = GridBagConstraints.FIRST_LINE_START;
cons.gridx = 2;
cons.gridy = 7;
cons.ipady = 0;
gbag.setConstraints(lbl5,cons);
c.add(lbl5);
cons.gridx = 6;
cons.gridy = 7;
gbag.setConstraints(lbl6,cons);
c.add(lbl6);
cons.anchor = GridBagConstraints.LINE_START;
cons.ipady = 0;
cons.gridx = 5;
cons.gridy = 8;
cons.ipady = 10;
cons.ipadx = 400;
gbag.setConstraints(sp, cons);
add(sp);
cons.anchor = GridBagConstraints.PAGE_END;
cons.ipadx = 0;
cons.gridx = 5;
cons.gridy = 9;
gbag.setConstraints(b1,cons);
c.add(b1);
setSize(1030,900);
setTitle("Bill");
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
catch(Exception ae)
{
ae.printStackTrace();
}
}
}
/*public static void main(String[] args)
{
GridBagLayoutDemo2 demo = new GridBagLayoutDemo2();
}*/
class Paction implements ActionListener,Printable
{
JFrame frameToPrint;
@Override
public void actionPerformed(ActionEvent e)
{
PrinterJob job = PrinterJob.getPrinterJob();//get printer job list
job.setPrintable(this);
if(job.printDialog() == true){
try{
job.print();
}
catch(PrinterException ex){
ex.printStackTrace();
}
}
}
@Override
public int print(Graphics g, PageFormat pf, int page) throws PrinterException,PrinterException
{
if (page > 0) { /* We have only one page, and 'page' is zero-based */
return NO_SUCH_PAGE;
}
/*
* User (0,0) is typically outside the imageable area, so we must translate
* by the X and Y values in the PageFormat to avoid clipping
*/
Graphics2D g2d = (Graphics2D) g;
g2d.translate(pf.getImageableX(), pf.getImageableY());
/* Now print the window and its visible contents */
// frameToPrint.printAll(g);
/* tell the caller that this page is part of the printed document */
return PAGE_EXISTS;
}
public Paction(JFrame f){
frameToPrint = f;
}
}
screenshot of GridBagLayoutDemo2.java
当我点击打印按钮时，我会看到打印对话框，但当我打印它时，我会看到空白页。如果有人知道的话，请帮帮我，我这几天一直在尝试
提前谢谢
# 1 楼答案
在你的GridBagLayoutDemo2中。java删除声明
JFrame frameToPrint;（您甚至从未初始化它），将b1.addActionListener(new Paction(frameToPrint));更改为b1.addActionListener(new Paction(this));，并且不要忘记取消Paction类中的//frameToPrint.printAll(g);注释