java如何循环数据库中每一行

String sql="";
Statement stmt=con.createStatement();
ResultSet rs=stmt.executeQuery(sql);
ResultSetMetaData rsmd=rs.getMetaData();
int col_len=getColumnCount();

while(rs.next()){
for(int j=1;j<=col_len;j++)
{
System.out.print(
rsmd.getColumnName(j)+"="+rs.getString(j)+" "
);
System.out.println();
}

while(rs.next()){
System.out.println(
rsmd.getColumnName(j)+"="+rs.getString(j)+" "
);
}

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