Question

如何从数据库中正确打印出所获取的数据。

在控制台上打印出来就像这样 - ＆gt; see here

  //initialize the connection
    try{
        Connection conn1=DriverManager.getConnection("jdbc:mysql://localhost/test","root","****");
        String query1= "SELECT * FROM student_table";
        Statement stmt1= conn1.createStatement();
        ResultSet res1=stmt1.executeQuery(query1);


        // Print the result
        System.out.println("id \t\t "+"name\t\t "+"class\t\t\t "+"age\n");

        while(res1.next()){ 
            System.out.println(res1.getString("id")+"\t\t "
                                +res1.getString("name")+"\t\t "
                                +res1.getString("class")+"\t\t "
                                +res1.getString("age"));
            }   
    }catch(Exception e){
        System.err.println(e);
    }
}

Answer 1

您可以使用String.format

进行格式化

while(res1.next()){ 
    System.out.println(String.format("%-16s",res1.getString("id"))
                    +String.format("%-16s",res1.getString("name"))
                    +String.format("%-24s",res1.getString("class"))
                    +String.format("%-16s",res1.getString("age")));
            }

由于\ t包含8个空格，我提供了＆＃39;％ - 16s＆＃39;基于您在结果集的标题中给出的\ t值。希望它有助于解决您的问题。输出图像在此处给出：https://i.stack.imgur.com/Qn6py.jpg

如何避免CONSOLE打印错误JAVA

1 个答案: