我必须编写一个程序，从 Excel 文件中读取数据并将这些数据加载到数据库中的表中。该表将具有 excel 文件的名称，表的字段将是 excel 文件第一行中的数据。我已经编写了代码来读取 excel 文件并使用我想要的名称创建表。我还设法将数据存储在表中。但是对于这两个操作，创建字段和将数据存储在表中，我使用的是 Hashmap。但是我在表格中得到的结果与我的 excel 文件中的序列不同。
例如我的excel文件中的数据是：
身份证 姓名 工资
5 克里斯汀 2349000
6 宝莲娜 1000
7 劳拉 12587458
8 电喷 34567
43 吉姆 45878
但是当我运行我的程序时，我在我的基础中得到的是：
姓名 身份证 工资
2349000 5 克里斯汀
宝莲娜 6 1000
等数据混淆了。
我的程序如下。谁能帮助我为什么会在我的结果中发生这种情况？先感谢您。
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
import java.util.Iterator;
import java.util.List;
import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Cell;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class readexcel {
static HashMap<String, Integer> tFields = new HashMap();
static HashMap[] tData;
public static void main(String[] args) throws Exception {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection) DriverManager.getConnection(
"jdbc:mysql://localhost:3306/kainourgia", "root", "root");
Statement stmt = con.createStatement();
// String filename = "C:\\Users\\Efi\\Documents\\test6.xls";
String fullPath = "C:\\Users\\Efi\\Documents\\test9.xls";
String Path = "C:\\Users\\Efi\\Documents\\";
String filename = "test9.xml";
String[] parts = filename.split("\\.");
String tablename = parts[0];
//Create an ArrayList to store the data read from excel sheet.
List sheetData = new ArrayList();
FileInputStream fis = null;
try {
//Create a FileInputStream that will be use to read the
// excel file.
fis = new FileInputStream(fullPath);
//Create an excel workbook from the file system
HSSFWorkbook workbook = new HSSFWorkbook(fis);
//Get the first sheet on the workbook.
HSSFSheet sheet = workbook.getSheetAt(0);
//store the data read on an ArrayList so that we can printed the
// content of the excel to the console.
Iterator rows = sheet.rowIterator();
while (rows.hasNext()) {
HSSFRow row = (HSSFRow) rows.next();
Iterator cells = row.cellIterator();
List data = new ArrayList();
while (cells.hasNext()) {
HSSFCell cell = (HSSFCell) cells.next();
data.add(cell);
}
sheetData.add(data);
}
} catch (IOException e) {
e.printStackTrace();
} finally {
if (fis != null) {
fis.close();
}
}
showExcelData(sheetData);
tFields = parseExcelColumnTitles(sheetData);
String str = getCreateTable(con, tablename, tFields);
tData = parseExcelColumnData(sheetData);
fillTable(con, tablename, tData);
}
// Iterates the data and print it out to the console.
private static void showExcelData(List sheetData) {
// HashMap<String, String> tableFields = new HashMap();
for (int i = 0; i < sheetData.size(); i++) {
List list = (List) sheetData.get(i);
for (int j = 0; j < list.size(); j++) {
Cell cell = (Cell) list.get(j);
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
System.out.print(cell.getNumericCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
System.out.print(cell.getRichStringCellValue());
} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
System.out.print(cell.getBooleanCellValue());
}
if (j < list.size() - 1) {
System.out.print(", ");
}
}
System.out.println("");
}
}
@SuppressWarnings( { "unchecked", "unused" })
private static HashMap parseExcelColumnTitles(List sheetData) {
// εδώ διαβάζω μόνο την γραμμή 0 κάθε φύλλου για να πάρω τους τίτλους
// των πεδίων
List list = (List) sheetData.get(0);
HashMap<String, Integer> tableFields = new HashMap(list.size());
for (int j = 0; j < list.size(); j++) {
Cell cell = (Cell) list.get(j);
tableFields.put(cell.getStringCellValue(), cell.getCellType());
}
return tableFields;
}
@SuppressWarnings( { "unchecked", "unused" })
private static HashMap[] parseExcelColumnData(List sheetData) {
// εδω πρέπει να μπει μια επανάληψη, από την γραμμή 1 μέχρι την
// τελευταία γραμμή του κάθε φύλλου
HashMap[] tousRows = new HashMap[sheetData.size() - 1];
for (int rowCounter = 1; rowCounter < sheetData.size(); rowCounter++) {
List list = (List) sheetData.get(rowCounter);
HashMap<String, Integer> tableFields = new HashMap(list.size());
String str;
String[] tousFields = new String[list.size()];
int i = 0;
for (int j = 0; j < list.size(); j++) {
Cell cell = (Cell) list.get(j);
if (cell != null) {
if (cell.getCellType() == Cell.CELL_TYPE_NUMERIC) {
tableFields.put(String.valueOf(cell
.getNumericCellValue()), cell.getCellType());
} else if (cell.getCellType() == Cell.CELL_TYPE_STRING) {
tableFields.put(cell.getStringCellValue(), cell
.getCellType());
} else if (cell.getCellType() == Cell.CELL_TYPE_BOOLEAN) {
tableFields.put(String.valueOf(cell
.getBooleanCellValue()), cell.getCellType());
}
}
}
tousRows[rowCounter - 1] = tableFields;
}
return tousRows;
}
private static String getCreateTable(Connection con, String tablename,
HashMap<String, Integer> tableFields) {
Iterator iter = tableFields.keySet().iterator();
Iterator cells = tableFields.keySet().iterator();
String str = "";
String[] allFields = new String[tableFields.size()];
int i = 0;
while (iter.hasNext()) {
String fieldName = (String) iter.next();
Integer fieldType = (Integer) tableFields.get(fieldName);
switch (fieldType) {
case Cell.CELL_TYPE_NUMERIC:
str = fieldName + " INTEGER";
break;
case Cell.CELL_TYPE_STRING:
str = fieldName + " VARCHAR(255)";
break;
case Cell.CELL_TYPE_BOOLEAN:
str = fieldName + " INTEGER";
break;
}
allFields[i++] = str;
}
try {
Statement stmt = con.createStatement();
// try
// {
// System.out.println( "Use the database..." );
// stmt.executeUpdate( "USE kainourgia;" );
// }
// catch( SQLException e )
// {
// System.out.println( "SQLException: " + e.getMessage() );
// System.out.println( "SQLState: " + e.getSQLState() );
// System.out.println( "VendorError: " + e.getErrorCode() );
// }
try {
String all = org.apache.commons.lang3.StringUtils.join(
allFields, ",");
String createTableStr = "CREATE TABLE IF NOT EXISTS "
+ tablename + " (" + all + ")";
System.out.println("Create a new table in the database");
stmt.executeUpdate(createTableStr);
} catch (SQLException e) {
System.out.println("SQLException: " + e.getMessage());
System.out.println("SQLState: " + e.getSQLState());
System.out.println("VendorError: " + e.getErrorCode());
}
} catch (Exception e) {
}
return str;
}
private static void fillTable(Connection con, String fieldname,
HashMap[] tableData) {
for (int row = 0; row < tableData.length; row++) {
HashMap<String, Integer> rowData = tableData[row];
Iterator iter = rowData.entrySet().iterator();
String str;
String[] tousFields = new String[rowData.size()];
int i = 0;
while (iter.hasNext()) {
Map.Entry pairs = (Map.Entry) iter.next();
Integer fieldType = (Integer) pairs.getValue();
String fieldValue = (String) pairs.getKey();
switch (fieldType) {
case Cell.CELL_TYPE_NUMERIC:
str = fieldValue;
break;
case Cell.CELL_TYPE_STRING:
str = "\'" + fieldValue + "\'";
break;
case Cell.CELL_TYPE_BOOLEAN:
str = fieldValue;
break;
default:
str = "";
break;
}
tousFields[i++] = str;
}
try {
Statement stmt = con.createStatement();
System.out.println("Use the table");
String all = org.apache.commons.lang3.StringUtils.join(
tousFields, ",");
String sql = "INSERT INTO " + fieldname + " VALUES (" + all
+ ")";
stmt.executeUpdate(sql);
} catch (SQLException e) {
System.out.println("SQLException: " + e.getMessage());
System.out.println("SQLState: " + e.getSQLState());
System.out.println("VendorError: " + e.getErrorCode());
}
}
// return str;
}
private Statement createStatement() {
return null;
}
}