我是新来的，这是我问的第一个问题。我一直在努力尝试用Jasper（我放弃了）或JFreeChart（我很想使用）制作一些图表）。 我想做的就是简单地处理一张产生饼图的照片。 我的数据库有一列描述对象的技术（WHERE'tehnica'= ulei）。我想通过对象的数量（count）在图表中显示所有这些技术。我错过了我的东西吗？代码？
import java.io.File;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.Statement;
import javax.swing.JTextField;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.data.general.DefaultPieDataset;
/*
* To change this license header, choose License Headers in Project
Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Belial
*/
public class Rapoarte extends javax.swing.JFrame {
JTextField ulei = null;
JTextField ceara = null;
JTextField acuarela = null;
JTextField guasa = null;
JTextField vopseaacrilica = null;
JTextField pastel = null;
JTextField fresca = null;
JTextField cerneala = null;
JTextField tempera = null;
JTextField grisaille = null;
JTextField pointilism = null;
JTextField vitraliu = null;
Connection con = null;
Statement st = null;
ResultSet rs = null;
public Rapoarte() {
initComponents();
con = MyConnection.getConnection();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jButton4 = new javax.swing.JButton();
jButton5 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jLabel1.setFont(new java.awt.Font("Times New Roman", 0, 24)); // NOI18N
jLabel1.setText("Rapoarte");
jButton2.setText("jButton2");
jButton2.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton2ActionPerformed(evt);
}
});
jButton3.setText("jButton3");
jButton4.setText("jButton4");
jButton5.setText("Cancel");
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(99, 99, 99)
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 108, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(108, 108, 108)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jButton2)
.addComponent(jButton3)
.addComponent(jButton4)
.addComponent(jButton5))))
.addContainerGap(115, Short.MAX_VALUE))
);
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addGap(31, 31, 31)
.addComponent(jLabel1)
.addGap(85, 85, 85)
.addComponent(jButton2)
.addGap(18, 18, 18)
.addComponent(jButton3)
.addGap(18, 18, 18)
.addComponent(jButton4)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 121, Short.MAX_VALUE)
.addComponent(jButton5)
.addGap(25, 25, 25))
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(0, 0, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
try {
st = con.createStatement();
if (st.execute("select count(id_exponata) as ulei from exponata where tehnica = 'ulei'")) {
rs = st.getResultSet();
rs.next();
ulei.setText(rs.getString("ulei"));
}
if (st.execute("select count(id_exponata) as ceara from exponata where tehnica = 'ceara'")) {
rs = st.getResultSet();
rs.next();
ceara.setText(rs.getString("ceara"));
}
if (st.execute("select count(id_exponata) as acuarela from exponata where tehnica = 'acuarela'")) {
rs = st.getResultSet();
rs.next();
acuarela.setText(rs.getString("acuarela"));
}
if (st.execute("select count(id_exponata) as guasa from exponata where tehnica = 'guasa'")) {
rs = st.getResultSet();
rs.next();
guasa.setText(rs.getString("guasa"));
}
if (st.execute("select count(id_exponata) as vopseaacrilica from exponata where tehnica = 'vopsea acrilica'")) {
rs = st.getResultSet();
rs.next();
vopseaacrilica.setText(rs.getString("vopsea acrilica"));
}
if (st.execute("select count(id_exponata) as pastel from exponata where tehnica = 'pastel'")) {
rs = st.getResultSet();
rs.next();
pastel.setText(rs.getString("pastel"));
}
if (st.execute("select count(id_exponata) as fresca from exponata where tehnica = 'fresca'")) {
rs = st.getResultSet();
rs.next();
fresca.setText(rs.getString("fresca"));
}
if (st.execute("select count(id_exponata) as cerneala from exponata where tehnica = 'cerneala'")) {
rs = st.getResultSet();
rs.next();
cerneala.setText(rs.getString("cerneala"));
}
if (st.execute("select count(id_exponata) as tempera from exponata where tehnica = 'tempera'")) {
rs = st.getResultSet();
rs.next();
tempera.setText(rs.getString("tempera"));
}
if (st.execute("select count(id_exponata) as grisaille from exponata where tehnica = 'grisaille'")) {
rs = st.getResultSet();
rs.next();
grisaille.setText(rs.getString("grisaille"));
}
if (st.execute("select count(id_exponata) as pointilism from exponata where tehnica = 'pointilism'")) {
rs = st.getResultSet();
rs.next();
pointilism.setText(rs.getString("pointilism"));
}
if (st.execute("select count(id_exponata) as vitraliu from exponata where tehnica = 'vitraliu'")) {
rs = st.getResultSet();
rs.next();
vitraliu.setText(rs.getString("vitraliu"));
}
String uleiE = ulei.getText();
String cearaE = ceara.getText();
String acuarelaE = acuarela.getText();
String guasaE = guasa.getText();
String vopseaacrilicaE = vopseaacrilica.getText();
String pastelE = pastel.getText();
String frescaE = fresca.getText();
String cernealaE = cerneala.getText();
String temperaE = tempera.getText();
String grisailleE = grisaille.getText();
String pointilismE = pointilism.getText();
String vitraliuE = vitraliu.getText();
DefaultPieDataset pieDataset = new DefaultPieDataset();
pieDataset.setValue("ulei", new Integer(uleiE));
pieDataset.setValue("ceara", new Integer(cearaE));
pieDataset.setValue("acuarela", new Integer(acuarelaE));
pieDataset.setValue("guasa", new Integer(guasaE));
pieDataset.setValue("vopseaacrilica", new Integer(vopseaacrilicaE));
pieDataset.setValue("pastel", new Integer(pastelE));
pieDataset.setValue("fresca", new Integer(frescaE));
pieDataset.setValue("cerneala", new Integer(cernealaE));
pieDataset.setValue("tempera", new Integer(temperaE));
pieDataset.setValue("grisaille", new Integer(grisailleE));
pieDataset.setValue("pointilism", new Integer(pointilismE));
pieDataset.setValue("vitraliu", new Integer(vitraliuE));
JFreeChart chart = ChartFactory.createPieChart("Exponate pe tehnici", pieDataset, true, true, false);
// Title
// Dataset
// Show legend
// Use tooltips
try {
ChartUtilities.saveChartAsJPEG(new File("chart.jpg"), chart, 500, 300);
} catch (Exception e) {
System.out.println("Problem occurred creating chart.");
}
}
catch(Exception e)
{
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Rapoarte.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Rapoarte.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Rapoarte.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Rapoarte.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Rapoarte().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton jButton2;
private javax.swing.JButton jButton3;
private javax.swing.JButton jButton4;
private javax.swing.JButton jButton5;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
// End of variables declaration
}