我遇到了我正在处理的java-csv-mysql gui应用程序的问题。 我将在以下功能中分解应用程序： 1.使用JFileChooser选择一个CSv， 2.阅读csv 3.将csv导入Mysql表 4.将csv内容导入表格后显示它们。
我设法让它做以下功能。 1.选择一个csv文件 2.读取csv文件......-只读取一行 3.显示阅读记录
我遇到以下问题时遇到问题 1.读取csv中的“全部”记录 2.上传到csv。
我得到的错误是一个ArrayIndexOutofBoundsException：3 这是由于阅读csv。 csv具有以下格式：
$ npm run build
> f7-cnode@2.2.0 build C:\wamp64\www\Cordova\Cordova-ts\1
> cross-env NODE_ENV=production webpack --config build/webpack.config.js -p --colors --hide-modules --display-optimization-bailout
Hash: bf98e84f9caf99c38ba5
Version: webpack 3.10.0
Time: 12844ms
5 assets
ERROR in app.js from UglifyJs
Unexpected token: name (Dom7) [app.js:749,6]
ERROR in app.js from UglifyJs
Unexpected token: name (Dom7) [app.js:749,6]
Child html-webpack-plugin for "index.html":
1 asset
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/css-loader/index.js!src/assets/css/icons.css:
2 assets
Child extract-text-webpack-plugin node_modules/extract-text-webpack-plugin/dist node_modules/css-loader/index.js!node_modules/less-loader/dist/cjs.js!node_modules/postcss-loader/lib/index.js!src/assets/app.less:
1 asset
npm ERR! code ELIFECYCLE
npm ERR! errno 2
npm ERR! f7-cnode@2.2.0 build: `cross-env NODE_ENV=production webpack --config build/webpack.config.js -p --colors --hide-modules --display-optimization-bailout`
npm ERR! Exit status 2
npm ERR!
npm ERR! Failed at the f7-cnode@2.2.0 build script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\ThinkIT\AppData\Roaming\npm-cache\_logs\2018-03-27T10_53_58_787Z-debug.log
csv在读取csv时需要执行以下操作 1.阅读csv， 2.将最后一列分隔为'/'。
这将导致有4列而不是3列。
这是我到目前为止的代码。
2018/01/25,58,294616/0
2018/01/27,102,298970/0
这是我得到的例外。
public class Payment_import_v4 extends JFrame{
private JTable table;
/**
* @param args the command line arguments
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable(){
public void run()
{
createAndshowGUI();
}
});
}
private static void createAndshowGUI(){
Payment_import_v4 form = new Payment_import_v4();
form.setVisible(true);
}
public Payment_import_v4(){
//form frame
super("Payment Import");
setSize(900,600);
setLocation(500,280);
getContentPane().setLayout(null);
//Label Result
final JLabel lblResult = new JLabel("Result",JLabel.CENTER);
lblResult.setBounds(150,22,370,14);
getContentPane().add(lblResult);
//Table
table = new JTable();
getContentPane().add(table);
//Table Model
final DefaultTableModel model = (DefaultTableModel)table.getModel();
model.addColumn("PayDate");
model.addColumn("Ammount");
model.addColumn("LinkId");
model.addColumn("BranchNo");
//ScrollPane
JScrollPane scroll = new JScrollPane(table);
scroll.setBounds(84,98,506,79);
getContentPane().add(scroll);
//Button Open
JButton btnOpen = new JButton("Select File");
btnOpen.setBounds(268,47,135,23);
btnOpen.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
JFileChooser fileOpen = new JFileChooser();
FileFilter filter = new FileNameExtensionFilter("CSV file","csv");
fileOpen.addChoosableFileFilter(filter);
int ret = fileOpen.showDialog(null,"Choose file");
if(ret == JFileChooser.APPROVE_OPTION){
File file = fileOpen.getSelectedFile();//gets selectedFile.
try {
BufferedReader br = new BufferedReader(new FileReader(file));
int row = 0;
//if (br.readLine() != null) {line = br.readLine();
while ((br.readLine()) != null) {
String line = br.readLine();// br string variable
String[] rawRow = line.split(",");
String lastEntry = rawRow[rawRow.length - 1];//this contains the LinkId/branchNo
String[] properLastEntry = lastEntry.split("/");//this contains the LinkId/branchNo split into two columnms
String[] oneRow = new String[rawRow.length + 1];
System.arraycopy(rawRow, 0, oneRow, 0, rawRow.length - 1);
System.arraycopy(properLastEntry, 0, oneRow, oneRow.length - properLastEntry.length, properLastEntry.length);
model.addRow(new Object[0]);
model.setValueAt(rawRow[0], row, 0);
model.setValueAt(rawRow[1], row, 1);
model.setValueAt(rawRow[2], row, 2);
model.setValueAt(rawRow[3], row, 3);
row++;
}
br.close();
//}
} catch (IOException ex) {
ex.printStackTrace();
}
lblResult.setText(fileOpen.getSelectedFile().toString());
}
}
});
getContentPane().add(btnOpen);
//btn Save
JButton btnSave = new JButton("Save");
btnSave.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ea){
SaveData();
}
});
btnSave.setBounds(292,228,89,23);
getContentPane().add(btnSave);
}
private void SaveData(){
Connection connect = null;
Statement stmt = null;
try{
//DriverManager Loader
Class.forName("com.mysql.jdbc.Driver");
//connection string url.. the port//schema name//username//password
//this is the test Server ;oginDetails
connect = DriverManager.getConnection("jdbc:mysql://localhost:3306/riskfin", "root", "riskfin");//-------------> this is for the localhost server
stmt = connect.createStatement();
for(int i = 0;i<table.getRowCount();i++)
{
String PayDate = table.getValueAt(i,0).toString();
String Ammount = table.getValueAt(i,1).toString();
String LinkID = table.getValueAt(i,2).toString();
String BranchNo = table.getValueAt(i,3).toString();
String sql = "Insert into temp_payment_import "
+"VALUES('"+LinkID+"','"
+Ammount+"','"
+PayDate+"','"
+BranchNo+"')";
stmt.execute(sql);
}
JOptionPane.showMessageDialog(null,"Data imported Successfully");
}catch(Exception ex){
JOptionPane.showMessageDialog(null,ex.getMessage());
ex.printStackTrace();
}
try{
if(stmt!= null){
stmt.close();
connect.close();
}
}catch(SQLException e){
System.out.println(e.getMessage());
e.printStackTrace();
}
}
}
答案 0 :(得分：0)
您花了很大力气编写非常准确的数组操作代码来处理CSV数据中的两个分隔符。但是你从未真正使用oneRow数组。改变这个：
model.addRow(new Object[0]);
model.setValueAt(rawRow[0], row, 0);
model.setValueAt(rawRow[1], row, 1);
model.setValueAt(rawRow[2], row, 2);
model.setValueAt(rawRow[3], row, 3); // ArrayIndexOutOfBoundsException
到此：
model.addRow(new Object[0]);
model.setValueAt(oneRow[0], row, 0);
model.setValueAt(oneRow[1], row, 1);
model.setValueAt(oneRow[2], row, 2);
model.setValueAt(oneRow[3], row, 3);
根据定义，rawRow只会包含3个元素，因为最终的2个字词仍会显示为单个字词（尚未在/上再次分割的字词）。