private boolean jButtonactionPerformed(ActionEvent e) {
        try
        {   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            String url="jdbc:odbc:ds;DatabaseName=uubird";
             Connection con=DriverManager.getConnection(url,"sa","asd");
             java.sql.Statement pst=con.createStatement();
             String yh=jTextField.getText();
             String pw=new String(jPasswordField.getPassword());
             String sql="select * from addressbook where yonghu='"+yh+"'and password='"+pw+"'";
             System.out.println(sql);
             ResultSet rs =pst.executeQuery(sql);
              boolean dd=rs.next();
     
             try{    
               if(dd){
                 for(int i=1;i<3;i++)
                  { System.out.println(rs.getString(i+1));
                  
                  
                  
                 /*在以下程序总是运行错误！值rs.getString(i+1)赋值不进去asd[i]；
                说报错，不知道这个是怎么回事？！！高手帮帮忙啦
                */
                    zzdd.this.asd[i]=rs.getString(i+1);
                    System.out.println( asd[i]+"==================");
                    
                    
                    
                    
                    
                }
                System.out.println(rs.getDate(4));
            
                for(int j=4;j<7;j++)
                { System.out.println(rs.getString(j+1).toString());
                 
                }
            }
        }catch(Exception e1e)
        {
             System.out.println("===============zhe li cuo la =======================");
        }
                    
            if(dd){

            pst.close();
            con.close();
            zzdd.this.dispose();
            return true;}

        }catch(Exception ee)
        {
            JOptionPane.showMessageDialog(this, "登入失败！","登入",JOptionPane.INFORMATION_MESSAGE);
            
        }
        return false;
        
    }

private boolean jButtonactionPerformed(ActionEvent e) {
        try
        {   Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
            String url="jdbc:odbc:ds;DatabaseName=uubird";
             Connection con=DriverManager.getConnection(url,"sa","asd");
             java.sql.Statement pst=con.createStatement();
             String yh=jTextField.getText();
             String pw=new String(jPasswordField.getPassword());
             String sql="select * from addressbook where yonghu='"+yh+"'and password='"+pw+"'";
             System.out.println(sql);
             ResultSet rs =pst.executeQuery(sql);
              boolean dd=rs.next();
      
             try{     
               if(dd){
                 for(int i=1;i<3;i++)
                  {
                                                                       // System.out.println(rs.getString(i+1));
                  
                  
                     
                 /*在以下程序总是运行错误！值rs.getString(i+1)赋值不进去asd[i]；
                说报错，不知道这个是怎么回事？！！高手帮帮忙啦
                */   
                    asd[i]=rs.getString(i+1);
                    System.out.println( asd[i]+"==================");
                     
                     
                     
                     
                     
                }  
                                                                      //System.out.println(rs.getDate(4));
                asd[3]=rs.getDate(4).toString();
                for(int j=4;j<7;j++)
                { asd[j]= rs.getString(j+1);                  
                }
            }
        }catch(Exception e1e)
        {
             System.out.println("===============zhe li cuo la =======================");
        }
                     
            if(dd){
 
            pst.close();
            con.close();
            zzdd.this.dispose();
            return true;}
 
        }catch(Exception ee)
        {
            JOptionPane.showMessageDialog(this, "登入失败！","登入",JOptionPane.INFORMATION_MESSAGE);
            
        }
        return false;
         
    }
















 
 自己想的结论 rs.getString(i)只可以用一次！！两次就不可以啦


哈哈。。。没想到是自己先想出来啦。。
不过具体为什么这样，还是不懂耶！！

回复 2楼 uubird
数据库里有一行以上数据吗?

程序有问题
自己上网找个JDBC程序 好好看看
还有if条件不要哪么定义！不规范

可是版主，偶运行时时正确的。。IF我本来也不是这么用的。。一直在尝试调试。。就越改越改乱啦。。。
呵呵。。不过很感谢你的提醒，我才学这个，很多不是很懂。。。那个老师教的不好，只能自己看啦！！

呵呵 好好学 没有什么学不会的

  同意楼上观点。