这是我的问题。我必须创建一个程序，我将从excel文件中读取数据并将此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文件的第一行中的数据。我已经使代码读取excel文件并使用我想要的名称创建表。现在我必须在表中插入值，但在这里我有错误。
以下代码是我制作的整个程序。
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 readexcel {
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\\myfiles\\Documents\\test6.xls";
String fullPath = "C:\\Users\\myfiles\\Documents\\test7.xls";
String Path = "C:\\Users\\myfiles\\Documents\\";
String filename = "test7.xml";
String[] parts = filename.split("\\.");
String tablename = parts[0];
List sheetData = new ArrayList();
FileInputStream fis = null;
try {
fis = new FileInputStream(fullPath);
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);
HashMap<String,Integer> tFields = new HashMap();
tFields = parseExcelData(sheetData);
String str = getCreateTable(con, tablename, tFields);
str = fillTable ( con, tablename, tFields);
}
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 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;
}
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 " + 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 String fillTable(Connection con, String fieldname, HashMap<String, Integer> tableFields){
Iterator iter = tableFields.keySet().iterator();
Iterator cells = tableFields.keySet().iterator();
String str="";
String[] tousFields = new String[tableFields.size()];
int i = 1;
while (iter.hasNext()){
String fieldName = (String) iter.next();
Integer fieldType=(Integer)tableFields.get(fieldname);
while (cells.hasNext()){
String fieldName1 = (String) cells.next();
Integer fieldType1=(Integer)tableFields.get(fieldName1);
}
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;
}
}
我得到的错误是：
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 3
at readexcel.fillTable(readexcel.java:183)
at readexcel.main(readexcel.java:68)
有人可以帮我解决吗？ 如何在每个单元格中插入值，我该怎么办？ 插入值中的命令是否正确？
答案 0 :(得分：0)
您尝试访问tousFields中的非现有索引。
您需要将其声明为：
String[] tousFields = new String[tableFields.size() + 1];