while (rs.next()) {
   for (int j = 1; j < columncount; j++) {
       System.out.println( rsd.getColumnName(j) + "::" + rs.getString(j));      
   }
}

您可以从ResultSet元数据中获得此信息。看到ResultSetMetaData

e.g.

 ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
 ResultSetMetaData rsmd = rs.getMetaData();
 String name = rsmd.getColumnName(1);

你可以从那里得到列名。如果有的话

select x as y from table

那么rsmd.getColumnLabel()也会给你检索到的标签名。

SQLite 3

教科书getMetaData ();

DatabaseMetaData md = conn.getMetaData();
ResultSet rset = md.getColumns(null, null, "your_table_name", null);

System.out.println("your_table_name");
while (rset.next())
{
    System.out.println("\t" + rset.getString(4));
}

编辑:这也适用于PostgreSQL

你可以使用ResultSetMetaData (http://java.sun.com/javase/6/docs/api/java/sql/ResultSetMetaData.html)对象，就像这样:

ResultSet rs = stmt.executeQuery("SELECT * FROM table");
ResultSetMetaData rsmd = rs.getMetaData();
String firstColumnName = rsmd.getColumnName(1);

我知道，这个问题已经回答了，但可能像我这样的人需要通过标签而不是索引访问DatabaseMetaData的列名:

ResultSet resultSet = null;
DatabaseMetaData metaData = null;

    try {
        metaData  = connection.getMetaData();
        resultSet = metaData.getColumns(null, null, tableName, null);

        while (resultSet.next()){
            String name = resultSet.getString("COLUMN_NAME");
        }
    }

@Cyntech是对的。

如果你的表是空的，你仍然需要得到表的列名，你可以得到你的列类型为Vector，如下所示:

ResultSet rs = stmt.executeQuery("SELECT a, b, c FROM TABLE2");
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();

Vector<Vector<String>>tableVector = new Vector<Vector<String>>(); 
boolean isTableEmpty = true;
int col = 0;

 while(rs.next())
    {
      isTableEmpty = false;  //set to false since rs.next has data: this means the table is not empty
       if(col != columnCount)
          {
            for(int x = 1;x <= columnCount;x++){
                 Vector<String> tFields = new Vector<String>(); 
                 tFields.add(rsmd.getColumnName(x).toString());
                 tableVector.add(tFields);
             }
            col = columnCount;
          }
     } 


      //if table is empty then get column names only
  if(isTableEmpty){  
      for(int x=1;x<=colCount;x++){
           Vector<String> tFields = new Vector<String>(); 
           tFields.add(rsmd.getColumnName(x).toString());
           tableVector.add(tFields);
        }
      }

 rs.close();
 stmt.close();

 return tableVector;