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我正在尝试制作一个应用程序，该应用程序将用户添加到我的SQL服务器的一些字符串。然而，当我试图将一个字符串从JTextField中它被添加两次添加到我的JList ..Defaultlistmodel从jtextfield中添加两个项目
这里是东西
用户增加了JTextField的名称。当他打的+按钮，它也会发送到的jList
public void addBrand() {
int index = BrandList.getSelectedIndex(); // get selected index
if (index == -1) { // no selection, so insert at beginning
index = 0;
}
else { // add after the selected item
index++;
}
model.insertElementAt(BrandLbl.getText(), index);
BrandLbl.setText(null);
}
都在这里很好，我看到一个产品加入我的JList
当用户决定列表完成，他打“下一步”按钮， 在sendArraytoDB（JList的列表）方法被调用
public static void sendArraytoDB(JList<String> list){
Connection con = null;
PreparedStatement stm = null;
String updQuery = "insert into brand_names (name) values (?)";
try{
con = DB.getConnection();
//con.setAutoCommit(false);
int x =1;
stm = con.prepareStatement(updQuery);
int f = list.getModel().getSize();
System.out.print(f);
for (int i=0; i<list.getModel().getSize(); i++){
String name =list.getModel().getElementAt(i);
stm.setString(x, name);
//try{
stm.executeUpdate();
//}finally{
//stm.close();
//}
}
}catch(SQLException ex){
System.out.printf("error while sending array to db");
ex.printStackTrace();
}finally{
if (stm != null){
等等等等....
我的运气不好我DATABSE显示，有两个南ES发送.. 所以它像
aa brand
1
2 "the string i sent"
列表中有一个永诺多个空的记录我的记录之前，我不能发表图片... 想看看跆拳道正在发生的事情我数了数列表的大小就在我把它
int f = list.getModel().getSize();
System.out.print(f);
，答案是2 ...如果我进入3记录其6 ..等等
我缩小了问题的模型，因为改变addBrand（）方法来
public void addBrand() {
String all = "xghxc";
model.addElement(all);
}
厚颜无耻显示了两个“xghxc”被添加到我的名单在同一时间在我自己的眼睛惊奇
我搜索谷歌前面，但它甚至不必须有类似的问题，以矿山:(
我需要的是一个代码或咨询或不便以点我不加入之间我记录一个空的无用记录
这里是我的全部代码的人谁拥有耐心和时间
MyMain.java
package tweGraf;
import javax.swing.JFrame;
public class MyMain {
public static void main(String[] args) {
// TODO Auto-generated method stub
Gui g = new Gui();
DB.MakePool();
g.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
g.setSize(1000, 800);
g.setVisible(true);
}
}
Gui.java
package tweGraf;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.SQLException;
import java.util.logging.Level;
import java.util.logging.Logger;
public class Gui extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JFrame frameYesNo = new JFrame();
String message = "all data will perish. are you sure";
private JPanel Container = new JPanel(); // panels
private JPanel FirstPanel = new JPanel();
private JPanel NewSession = new JPanel();
private JPanel LoadSession = new JPanel();
private JPanel LoadList = new JPanel();
private JPanel GraphSub1 = new JPanel();
private JPanel GraphSub2 = new JPanel();
private JPanel GraphSub3 = new JPanel();
private JTabbedPane GraphPanel = new JTabbedPane();
private JButton NewSessBtn = new JButton(); // buttons
private JButton LoadSessBtn = new JButton();
private JButton BackFP = new JButton();
private JButton plusBrand = new JButton();
private JButton minusBrand = new JButton();
private JButton Next = new JButton();
private JLabel EnterBrandLbl = new JLabel(
"Please insert brands for analysis "); // Labels
private JTextField BrandLbl = new JTextField(20); // textfields
public DefaultListModel<String> model = new DefaultListModel<String>
public JList BrandList = new JList(model); // list
private JScrollPane MyScrollPane = new JScrollPane(BrandList);
private CardLayout cardLayout = new CardLayout(); // layouts
private GridBagLayout MyLayout = new GridBagLayout();
GridBagConstraints MyConstr = new GridBagConstraints();
public Gui() {
super("twegraph");
NewSessBtn.setText("New Session"); // button configuration
LoadSessBtn.setText("Load Session");
BackFP.setText("Back");
plusBrand.setText("+");
minusBrand.setText("-");
Next.setText("Next");
actionListener al = new actionListener();
NewSessBtn.addActionListener(al); // add action listeners
LoadSessBtn.addActionListener(al);
BackFP.addActionListener(al);
plusBrand.addActionListener(al);
minusBrand.addActionListener(al);
Next.addActionListener(al);
plusBrand.addActionListener(al);
minusBrand.addActionListener(al);
Container.setLayout(cardLayout); // panels to container+
Container.add(FirstPanel, "FirstPanel");
Container.add(NewSession, "NewSession");
Container.add(LoadSession, "LoadSession");
Container.add(GraphPanel, "GraphPanel");
Container.add(LoadList, "LoadList");
FirstPanel.setLayout(MyLayout); // first panel
MyConstr.gridwidth = 3;
MyConstr.gridheight = 3;
MyConstr.weightx = 1.0;
MyConstr.weighty = 1.0;
MyConstr.ipadx = 100;
MyConstr.ipady = 50;
MyConstr.insets = new Insets(50, 20, 50, 20);
MyConstr.gridx = 1;
MyConstr.gridy = 0;
MyConstr.anchor = GridBagConstraints.NORTH;
MyLayout.setConstraints(NewSessBtn, MyConstr);
FirstPanel.add(NewSessBtn);
MyConstr.gridx = 1;
MyConstr.gridy = 2;
MyConstr.anchor = GridBagConstraints.SOUTH;
MyLayout.setConstraints(LoadSessBtn, MyConstr);
FirstPanel.add(LoadSessBtn);
NewSession.setLayout(MyLayout); // New Session panel
MyConstr.gridwidth = 3;
MyConstr.gridheight = 3;
MyConstr.ipadx = 0; // size
MyConstr.ipady = 0; // size
MyConstr.gridx = 0;
MyConstr.gridy = 2;
MyConstr.insets = new Insets(10, 20, 10, 20);
MyConstr.anchor = GridBagConstraints.SOUTHWEST;
MyLayout.setConstraints(BackFP, MyConstr);
NewSession.add(BackFP);
MyConstr.anchor = GridBagConstraints.SOUTHEAST;
MyLayout.setConstraints(Next, MyConstr);
NewSession.add(Next);
MyConstr.ipadx = 0; // size
MyConstr.ipady = 0; // size
MyConstr.gridx = 0; // place
MyConstr.gridy = 1; // place
MyConstr.insets = new Insets(0, 0, 0, 0);
MyConstr.anchor = GridBagConstraints.PAGE_START;
MyLayout.setConstraints(EnterBrandLbl, MyConstr);
NewSession.add(EnterBrandLbl);
MyConstr.gridx = 0;
MyConstr.gridy = 1;
MyConstr.anchor = GridBagConstraints.CENTER;
MyLayout.setConstraints(BrandLbl, MyConstr);
NewSession.add(BrandLbl);
MyConstr.gridx = 2;
MyConstr.gridy = 1;
MyConstr.anchor = GridBagConstraints.LAST_LINE_START;
MyLayout.setConstraints(plusBrand, MyConstr);
NewSession.add(plusBrand);
MyConstr.gridx = 2;
MyConstr.gridy = 1;
MyConstr.anchor = GridBagConstraints.LAST_LINE_END;
MyLayout.setConstraints(minusBrand, MyConstr);
NewSession.add(minusBrand);
MyConstr.ipadx = 0; // size
MyConstr.ipady = 0;
MyConstr.gridx = 0;
MyConstr.gridy = 1;
MyConstr.anchor = GridBagConstraints.SOUTH;
MyLayout.setConstraints(MyScrollPane, MyConstr);
NewSession.add(MyScrollPane);
GraphPanel.addTab("overall",GraphSub1); //Graph panel
GraphPanel.addTab("tweets/time",GraphSub2);
GraphPanel.addTab("fame",GraphSub3);
this.setContentPane(Container);
cardLayout.show(Container, "FirstPanel");
}
public class actionListener implements ActionListener {
public void actionPerformed(ActionEvent event) {
JButton src = (JButton) event.getSource();
int answer = 0;
if (src.equals(NewSessBtn))
{
answer = JOptionPane.showConfirmDialog(frameYesNo, message);
if (answer == JOptionPane.YES_OPTION) {
cardLayout.show(Container, "NewSession");
try {
DB.flushData();
} catch (SQLException ex) {
Logger.getLogger(Gui.class.getName()).log(Level.SEVERE, null, ex);
}
} else if (answer == JOptionPane.NO_OPTION) {
frameYesNo.dispose();
}
}
if (src.equals(LoadSessBtn)){
cardLayout.show(Container, "LoadSession");
}
if (src.equals(BackFP)){
cardLayout.show(Container, "FirstPanel");
}
if (src.equals(Next)){
cardLayout.show(Container, "GraphPanel");
DB.sendArraytoDB(BrandList);
}
if (src.equals(plusBrand)){
addBrand();
}
if (src.equals(minusBrand))
{
removeBrand();
}
}
}
public void addBrand() {
/*int index = BrandList.getSelectedIndex(); // get selected index
if (index == -1) { // no selection, so insert at beginning
index = 0;
}
else { // add after the selected item
index++;
}*/
String all = "xghxc";
//model.insertElementAt(BrandLbl.getText(), index);
model.addElement(all);
//BrandLbl.setText(null);
}
public void removeBrand() {
int index2 = BrandList.getSelectedIndex();
if (index2 != -1){
model.remove(index2);
}
int size = model.getSize();
if (size == 0) {
minusBrand.setEnabled(false);
} else {
//if (index == model.getSize()) {
//index--;
//}
}
}
}
DB.java
package tweGraf;
import com.mchange.v2.c3p0.ComboPooledDataSource;
import java.sql.*;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JList;
/**
*
* @author cheval
*/
public class DB {
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/twegrahpdb";
static final String USER = "root";
static final String PASS = "Xrt38H0a";
private static ComboPooledDataSource cdps = new ComboPooledDataSource();
public static void MakePool(){
try {
cdps = new ComboPooledDataSource();
cdps.setDriverClass(JDBC_DRIVER);
cdps.setJdbcUrl(DB_URL);
cdps.setUser(USER);
cdps.setPassword(PASS);
cdps.setMaxPoolSize(50);
cdps.setMaxStatements(50);
}catch(Exception ex){
System.out.printf("error smth wrong happened");
}
}
public static Connection getConnection() throws SQLException{
return cdps.getConnection();
}
public static void flushData() throws SQLException{
Statement stm = null;
Connection con = null;
try{
con = DB.getConnection();
stm = con.createStatement();
String flushquery1 = "TRUNCATE json_cache";
String flushquery2 = "TRUNCATE tweets";
String flushquery3 = "TRUNCATE tweet_mentions";
String flushquery4 = "TRUNCATE tweet_tags";
String flushquery5 = "TRUNCATE tweet_urls";
String flushquery6 = "TRUNCATE users";
String flushquery7 = "TRUNCATE brand_names";
stm.executeUpdate(flushquery1);
stm.executeUpdate(flushquery2);
stm.executeUpdate(flushquery3);
stm.executeUpdate(flushquery4);
stm.executeUpdate(flushquery5);
stm.executeUpdate(flushquery6);
stm.executeUpdate(flushquery7);
}catch (SQLException e) {
System.out.printf("error executing db clear");
} finally {
if (stm != null){
try{
stm.close();
System.out.printf("statement closed successfuly \n");
} catch (SQLException e){
System.out.printf("error closing statement");
}
}
if (con != null){
try{
con.close();
System.out.printf("connection closed succesfully \n");
} catch (SQLException e){
System.out.printf("error closing connection");
}
}
}
}
public static void sendArraytoDB(JList<String> list){
Connection con = null;
PreparedStatement stm = null;
String updQuery = "insert into brand_names (name) values (?)";
try{
con = DB.getConnection();
//con.setAutoCommit(false);
int x =1;
stm = con.prepareStatement(updQuery);
int f = list.getModel().getSize();
System.out.print(f);
for (int i=0; i<list.getModel().getSize(); i++){
String name =list.getModel().getElementAt(i);
stm.setString(x, name);
//try{
stm.executeUpdate();
//}finally{
//stm.close();
//}
}
}catch(SQLException ex){
System.out.printf("error while sending array to db");
ex.printStackTrace();
}finally{
if (stm != null){
try {
stm.close();
} catch (SQLException ex) {
Logger.getLogger(DB.class.getName()).log(Level.SEVERE, null, ex);
}
}
if (con != null){
try {
con.close();
} catch (SQLException ex) {
Logger.getLogger(DB.class.getName()).log(Level.SEVERE, null, ex);
}
}
}
}
}
，如果你仍然不知道不约我的实际问题，但护理STILL看到水木清华错误关于我的编码风格或我的技术plz发布它
感谢您的时间
'请参阅我的编码风格错误 - 变量名称不应以大写字符开头。注意论坛如何突出显示他们就像一个类名。另外类名应该以大写字符开头。 – camickr
thnks的意见 –