package myfirst;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import java.io.FileInputStream;
import java.lang.Iterable;
import java.net.URL;
import java.net.URLConnection;
import java.sql.*;
public class ReadExcel {
public static String fileToBeRead = "C:/Documents and Settings/Developer/Desktop/Anand exmps/Anand.xls";
public static void main(String argv[]) {
String urlcnt=" ";
Connection con=null;
Statement stmt=null;
int i=0;
int j=0;
try {
HSSFWorkbook workbook = new HSSFWorkbook(new FileInputStream(fileToBeRead));
HSSFSheet sheet = workbook.getSheetAt(0);
//HSSFRow row = sheet.getRow(0);
//HSSFCell cell = row.getCell((short) 0);
for (Row row : sheet) {
//for (Cell cell : row) {
Cell firstCell = row.getCell(0);
urlcnt=firstCell.getRichStringCellValue().getString();
System.out.println(urlcnt);
if(con==null){
SQLConnection.setURL("jdbc:sqlserver://192.168.2.53\\SQL2005;user=sa;password=365media;DatabaseName=LN_ADWEEK");
con=SQLConnection.getNewConnection();
stmt=con.createStatement();
}
try{
ResultSet rs;
boolean hasRows=false;
rs=stmt.executeQuery("select url from urls_linkins where url='"+urlcnt+"'");
while(rs.next()){
hasRows=true;
i++;
//String mem=rs.getString(1);
rs.close();
//return "This URL already exists in DB";
}
if(!hasRows){
j++;
PreparedStatement insertUrlStatement = con.prepareStatement("INSERT INTO urls_linkins(url, source_name, is_active, is_periodic, Link_Type, New_Entry) VALUES(?, ?, ?, ?, ?, ?)");
//insertUrlStatement.setInt(1, 21211);
insertUrlStatement.setString(1, urlcnt);
insertUrlStatement.setInt(2, 1);
insertUrlStatement.setInt(3, 1);
insertUrlStatement.setInt(4, 0);
insertUrlStatement.setInt(5, 1);
insertUrlStatement.setInt(6, 1);
insertUrlStatement.executeUpdate();
insertUrlStatement.close();
}
}
catch(Exception e){
e.printStackTrace();
}
}
}catch(Exception e){
e.printStackTrace();
}finally{
System.out.println(""+j+" url has been added and "+i+" url already exists in the DB");
}
}
}
我已经成功编译了上面的程序。但是在执行相同的操作时，我收到以下错误。
Exception in thread "main" java.lang.NoClassDefFoundError: ReadExcel (wrong name
: myfirst/ReadExcel)
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClassCond(Unknown Source)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$000(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
Could not find the main class: ReadExcel. Program will exit.
如何解决？
向上并按要求以 myfirst.ReadExcel 的形式执行程序，但现在发现此错误。
Exception in thread "main"java.lang.NoClassDefFoundError:org/apache/poi/hssf/usermodel/HSSFWorkbook
at myfirst.ReadExcel.main(ReadExcel.java:20)
Caused by: java.lang.ClassNotFoundException: org.apache.poi.hssf.usermodel.HSSFWorkbook
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 1 more