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我的課程需要一個數據庫並複製它。然後運行Apache POI並將值提取到Excel電子表格中。然後它刪除複製的文件。我有這兩個作爲獨立班，但現在，我把它們縫合在一起我得到一個錯誤，它似乎不喜歡公共類public class ExportToExcel {後的大括號。Apache POI和文件刪除類
CODE：
import java.io.File;
import java.io.IOException;
import javax.swing.JOptionPane;
import org.apache.commons.io.FileUtils;
import java.io.File;
import java.io.FileOutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.sql.SQLException;
import org.apache.poi.xssf.usermodel.XSSFCell;
import org.apache.poi.xssf.usermodel.XSSFRow;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
public class ExportToExcel {
{
public static void main(String args[]) throws IOException {
{
String source = "C:/Test/DATABASE.db";
String target ="C:/Test/COPY_";
File sourceFile = new File(source);
String name = sourceFile.getName();
File targetFile = new File(target+name);
System.out.println("Copying file : " + sourceFile.getName());
FileUtils.copyFile(sourceFile, targetFile);
System.out.println("copying of file:"+ sourceFile.getName() +"is completed");
Connection connection = null;
//@Override
//public Connection getConection() throws SQLException {
try {
Class.forName("org.sqlite.JDBC");
connection = DriverManager.getConnection("jdbc:sqlite:" + "C:/Test/DATABASE.db");
} catch (SQLException e) {
throw new SQLException(e.getMessage());
} catch (Exception e) {
throw new SQLException(e.getCause());
}
Statement statement = connection.createStatement();
ResultSet resultSet = statement
.executeQuery("select * from MAIN_TABLE");
XSSFWorkbook workbook = new XSSFWorkbook();
XSSFSheet spreadsheet = workbook
.createSheet("EXPORTED DB");
XSSFRow row=spreadsheet.createRow(1);// should start at 0 not one.. But this is ok for testing..
XSSFCell cell;
cell=row.createCell(1);// should start at 0 not one.. But this is ok for testing..
cell.setCellValue("Number");
cell=row.createCell(2);
cell.setCellValue("First Name");
cell=row.createCell(3);
cell.setCellValue("Last Name");
cell=row.createCell(4);
cell.setCellValue("Origin");
cell=row.createCell(5);
cell.setCellValue("Destination");
cell=row.createCell(6);
//
cell.setCellValue("Arrival");
cell=row.createCell(7);
cell.setCellValue("Departure");
cell=row.createCell(8);
cell.setCellValue("Status");
cell=row.createCell(9);
cell.setCellValue("Created");
cell=row.createCell(10);
cell.setCellValue("Updated");
cell=row.createCell(11);
cell.setCellValue("Message");
cell=row.createCell(12);
cell.setCellValue("Active");
//
int i=2;
while(resultSet.next())
{
row=spreadsheet.createRow(i);
cell=row.createCell(1);
cell.setCellValue(resultSet.getInt("number"));
cell=row.createCell(2);
cell.setCellValue(resultSet.getString("first_name"));
cell=row.createCell(3);
cell.setCellValue(resultSet.getString("last_name"));
cell=row.createCell(4);
cell.setCellValue(resultSet.getString("origin"));
cell=row.createCell(5);
cell.setCellValue(resultSet.getString("destination"));
//
cell=row.createCell(6);
cell.setCellValue(resultSet.getString("arrival"));
cell=row.createCell(7);
cell.setCellValue(resultSet.getString("departure"));
cell=row.createCell(8);
cell.setCellValue(resultSet.getString("status"));
cell=row.createCell(9);
cell.setCellValue(resultSet.getString("created"));
cell=row.createCell(10);
cell.setCellValue(resultSet.getString("updated"));
cell=row.createCell(11);
cell.setCellValue(resultSet.getString("message"));
cell=row.createCell(12);
cell.setCellValue(resultSet.getString("active"));
//
i++;
}
FileOutputStream out = new FileOutputStream(
new File("exceldatabase.xlsx"));
workbook.write(out);
out.close();
// workbook.close();
System.out.println(
"exceldatabase.xlsx written successfully");
{
try{
File filetodelete = new File("C:/Test/COPY_DATABASE.db");
if(filetodelete.delete()){
System.out.println(filetodelete.getName() + " is deleted!");
}else{
System.out.println("Delete has failed.");
}
}catch(Exception e){
e.printStackTrace();
}
}
}
}
}
錯誤：
Exception in thread "main" java.lang.Error: Unresolved compilation problem:
at ExportToExcel.main(ExportToExcel.java:20)
非常感謝！ – javajoejuan