java-提供适合组件的布局
作者：互联网
我正在努力为我的Swing组件提供良好的布局.当前使用的是FlowLayout,但看起来并不漂亮.我的要求是在顶行显示标签l0.然后,第二列中的标签l1,组合框c1和按钮b1(居中对齐).最后,输出显示在下面的Jtable中.我该怎么做呢？
import java.awt.*;
import java.awt.event.*;
import java.io.File;
import java.sql.*;
import java.util.Vector;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class r_search_1 extends JFrame implements ActionListener {
JFrame frame1;
JLabel l0, l1, l2;
JComboBox c1;
JButton b1;
Connection con;
ResultSet rs, rs1;
Statement st, st1;
PreparedStatement pst;
String ids;
static JTable table = new JTable();;
String[] columnNames = {"SECTION NAME", "REPORT NAME", "CONTACT", "LINK"};
String from;
Vector v = new Vector();
JMenuBar menu = new JMenuBar();
r_search_1()
{
frame1 = new JFrame("yippee");
frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame1.setLayout(new FlowLayout());
l0 = new JLabel("Fetching Search Results...");
l0.setForeground(Color.blue);
l0.setFont(new Font("Serif", Font.BOLD, 20));
l1 = new JLabel("Search");
b1 = new JButton("submit");
l0.setBounds(100, 50, 350, 40);
l1.setBounds(75, 110, 75, 20);
b1.setBounds(150, 150, 150, 20);
b1.addActionListener(this);
frame1.add(l0);
frame1.add(l1);
//frame1.add(b1);
frame1.setVisible(true);
frame1.setSize(1000, 400);
try
{
File dbFile = new File("executive_db.accdb");
String path = dbFile.getAbsolutePath();
con = DriverManager.getConnection("jdbc:odbc:Driver={Microsoft Access Driver (*.mdb, *.accdb)}; DBQ= " + path);
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
st = con.createStatement();
rs = st.executeQuery("select index_name from Index1");
while (rs.next())
{
ids = rs.getString(1);
v.add(ids);
}
c1 = new JComboBox(v);
c1.setEditable(true);c1.setSelectedItem("");
c1.setBounds(150, 110, 150, 20);
frame1.add(c1);
frame1.add(b1);
st.close();
rs.close();
} catch (Exception e) {
}
// setVisible(true);
}
public void actionPerformed(ActionEvent ae) {
if (ae.getSource() == b1) {
showTableData();
}
}
public void showTableData()
{
// frame1 = new JFrame("Database Search Result");
// frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
//frame1.setLayout(new FlowLayout());
DefaultTableModel model = new DefaultTableModel();
model.setColumnIdentifiers(columnNames);
table.setModel(model);
table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
table.setFillsViewportHeight(true);
JScrollPane scroll = new JScrollPane(table);
scroll.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
scroll.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED);
from = (String) c1.getSelectedItem();
String section_name = "";
String report_name = "";
String contact_name = "";
String link = "";
try
{
pst = con.prepareStatement("select distinct Section.Section_Name,Report.Report_Name,Report.Link,Contact.Contact_Name "
+ "FROM (( Section INNER JOIN Report ON Report.Section_ID=Section.Section_ID ) INNER JOIN Contact ON Contact.Contact_ID=Report.Contact_ID ) LEFT JOIN Metrics ON Metrics.Report_ID=Report.Report_ID "
+ " WHERE Section.Section_Name LIKE '%"+from+"%' OR Report.Report_Name LIKE '%"+from+"%' OR Metrics.Metric_Name LIKE '%"+from+"%' OR Contact.Contact_Name LIKE '%"+from+"%' ");
ResultSet rs = pst.executeQuery();
int i = 0;
while (rs.next()) {
section_name = rs.getString("Section_Name");
report_name = rs.getString("Report_Name");
contact_name = rs.getString("Contact_Name");
link = rs.getString("Link");
model.addRow(new Object[]{section_name, report_name, contact_name, link});
i++;
}
if (i < 1) {
JOptionPane.showMessageDialog(null, "No Record Found", "Error", JOptionPane.ERROR_MESSAGE);
}
if (i == 1) {
System.out.println(i + " Record Found");
} else {
System.out.println(i + " Records Found");
}
} catch (Exception ex) {
JOptionPane.showMessageDialog(null, ex.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
}
frame1.add(scroll);
frame1.setVisible(true);
// frame1.setSize(1000, 400);
//table.close()
}
public static void main(String args[]) {
new r_search_1();
}
}
这是我的要求：
解决方法:
笔记
>之所以命名为PoorlySpecifiedLayout,是因为您忘记了“ ..”和“(如果可调整大小)具有额外宽度/高度的部分.”
>用户界面自然比上面看到的要高.它被缩短以制作更好的屏幕截图.
import java.awt.*;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
public class PoorlySpecifiedLayout {
// the GUI as seen by the user (without frame)
JPanel ui = new JPanel(new BorderLayout(5,5));
String[] comboValues = {
"String to pad combo."
};
String[] tableHeader = {
"Section Name","Report Name","Contact","Link"
};
String[][] tableBody = {{"", "", "", ""}};
PoorlySpecifiedLayout() {
initUI();
}
public final void initUI() {
ui.setBorder(new EmptyBorder(20,20,20,20));
JPanel top = new JPanel(new BorderLayout(15, 5));
ui.add(top, BorderLayout.PAGE_START);
top.add(new JLabel(
"Fetching search results", SwingConstants.CENTER));
JPanel controls = new JPanel(new FlowLayout(SwingConstants.LEADING, 10, 5));
top.add(controls, BorderLayout.PAGE_END);
controls.add(new JLabel("Search:"));
controls.add(new JComboBox(comboValues));
JButton submit = new JButton("submit");
Insets padButton = new Insets(5,20,5,20);
submit.setMargin(padButton);
controls.add(submit);
JTable table = new JTable(tableBody, tableHeader);
ui.add(new JScrollPane(table));
}
public final JComponent getUI(){
return ui;
}
public static void main(String[] args) {
Runnable r = new Runnable() {
@Override
public void run() {
PoorlySpecifiedLayout psl = new PoorlySpecifiedLayout();
JFrame f = new JFrame("Poorly Specified Layout");
f.add(psl.getUI());
// Ensures JVM closes after frame(s) closed and
// all non-daemon threads are finished
f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
// See https://stackoverflow.com/a/7143398/418556 for demo.
f.setLocationByPlatform(true);
// ensures the frame is the minimum size it needs to be
// in order display the components within it
f.pack();
// should be done last, to avoid flickering, moving,
// resizing artifacts.
f.setVisible(true);
}
};
// Swing GUIs should be created and updated on the EDT
// http://docs.oracle.com/javase/tutorial/uiswing/concurrency
SwingUtilities.invokeLater(r);
}
}
标签：layout,swing,layout-manager,java 来源： https://codeday.me/bug/20191029/1960779.html