我正在尝试制作一个程序，我将从excel文件中读取数据并将它们存储在数据库中。我使用 eclipse 作为编辑器和 mySQL。我正在使用 APACHE POI 读取 excel 文件和 JDBC 进行连接。excel文件的结构如下图所示：
ID NAME SALARY STREET
--- ---- ------ -------------
321 TIM 1254 14 avenue
121 PAUL 1265 28h oktovriou
432 NICK 4521 papaflessa
我当然有很多这样的文件，其中包含更多的行和列。我的程序的目的是读取数据，创建名为 excel 文件名称的表，并将每个表的字段作为 excel 文件的第一行。之后这些值将是 excel 文件的其余数据。在下面的代码中，我设法阅读了它们，在控制台中显示数据。Afterwrds 我尝试使用 JDBC 调用数据库，但是在创建表时出现问题。
try
{
String[] allFields;
String createTableStr = "CREATE TABLE" + createTableStr
+ "(" + org.apache.commons.lang3.StringUtils.join(allFields,
",") + ")";
有人可以帮我吗？
先感谢您！：）
import java.io.FileInputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
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 exam1 {
@SuppressWarnings({ "unchecked", "unchecked" })
static void main (String[] args) throws Exception {
String filename = "C:\\Users\\Efi\\Documents\\test5.xls";
List sheetData = new ArrayList();
FileInputStream fis = null;
try {
fis = new FileInputStream(filename);
HSSFWorkbook workbook = new HSSFWorkbook(fis);
HSSFSheet sheet = workbook.getSheetAt(0);
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);
@SuppressWarnings("unused")
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(", ");
}}}
}
private static void showExcelData(List sheetData) {
}
@SuppressWarnings("unchecked")
private HashMap parseExcelData (List sheetData){
HashMap<String,Integer> tableFields = new HashMap();
List list = (List) sheetData.get(0);
for (int j=0; j<list.size(); j++){
Cell cell=(Cell) list.get(j);
tableFields.put(cell.getStringCellValue(),cell.getCellType());
}
return tableFields;
}
@SuppressWarnings({ "unchecked", "unchecked", "unchecked", "unchecked", "unused" })
private String getCreateTable(String tablename, HashMap<String, Integer> tableFields){
Iterator iter = 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;
}
return str;
}
public Connection getConnection() throws SQLException {
try {
Class.forName("com.mysql.jdbc.Driver");
Connection con = (Connection) DriverManager.getConnection("jdbc:mysql://localhost:3306/kainourgia","root", "root");
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[] allFields;
String createTableStr = "CREATE TABLE" + createTableStr
+ "(" + org.apache.commons.lang3.StringUtils.join(allFields,
",") + ")";
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 )
{
System.out.println( ((SQLException) e).getSQLState() );
System.out.println( e.getMessage() );
e.printStackTrace();
}
return null;
}
}