java面试回忆录
本文地址：http://blog.csdn.net/sushengmiyan/article/details/28479895
作者：sushengmiyan
-------------------------
1.报文格式定义如下：
20字符长的姓名+1字符长的性别+3字符长的年龄
姓名长度不足20的右边补空格 性别中0表示男，1表示女
年龄不足3字符的左边补0
如：
denny 0026
这一段报文解析后表示姓名为denny性别为男，年龄为26
数据库表结构如下：
create table test
(
name varchar(20) primary key,
sex varchar(1),
age varchar(3)
);
java
一，写一个方法
public String makePackage(String name, int sex, int age);
由输入的姓名，性别，年龄返回对应的报文
二、写一个方法
public void parserPackage(String package);
由输入的报文，解析后写入数据库表test中.
sql
从test中取出年龄大于16岁的前10条记录
从test中取出给定name的记录的sex,age以及按年龄排的名次
javascript
页面如下
<html>
<body>
<input id="package" type = "text"/>
<input type="button" onclick="parse()"/>
<input id="name" type="text"/>
<input id="sex" type="text"/>
<input id="age" type="text"/>
</body>
</html>
用javascript 实现方法parser() 当点击按钮的时候，按照报文格式解析id为package的文本域的内容，并将解析完的结果写入到相应的id的文本域里。
css
用css给上面的button加上背景图片
web
请求页面如下：
<html>
<body>
<form action = "testServer">
<input name = "package"type="text"/>
<input type="submit"/>
</form>
</body>
</html>
写一个servlet调用parsePackage方法将请求页面表单域中的package的值解析并写入数据库，将此servlet配置到tomcat中
-----------------------------
java答案如下：</p><pre code_snippet_id="376946" snippet_file_name="blog_20140604_2_2610834" name="code" class="javascript">import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
public class YuchengFacetoFace
{
//报文格式定义如下：
// 20字符长的姓名+1字符长的性别+3字符长的年龄
// 姓名长度不足20的右边补空格 性别中0表示男，1表示女
// 年龄不足3字符的左边补0
// 如：
// denny 0026
// 这一段报文解析后表示姓名为denny性别为男，年龄为26
public String makePackage(String name, int sex, int age)
{
//输入的合法性校验未做
String Result = "";
int length = name.length();
if (length < 20)
{
int cutLength = 20 - length;
for (int i = 0; i < cutLength; i++)
{
Result += " ";
}
Result += name;
}
Result += sex;
//099的情况呢？
if (age < 10)
{
Result = Result + 0 + 0 + age;
}
else
if (age < 100)
{
Result = Result + 0 + age;
}
else
{
Result += age;
}
return Result;
}
//由输入的报文，解析后写入数据库表test中.
public void parserPackage(String Package)
{
String name = Package.substring(0, 19);;
int sex = Integer.parseInt(Package.substring(20, 20));
int age = Integer.parseInt(Package.substring(21, 23));
/*
* insert into test values(name, sex, age);
* select top 10 * from test where age < 16
* select * from test where name = name odered by age
*/
}
//连接MYSQL数据库并创建数据库和表
public static void CreateDataBase() throws SQLException, ClassNotFoundException
{
String driver = "com.mysql.jdbc.Driver";
Class.forName(driver);//加载mysql数据库，用Class.forName（"驱动名称"）进行加载
//第二步，创建数据库连接，将数据库与当前文件连接起来，后面才可以对数据库进行操作
//格式：
String url = "jdbc:mysql://localhost:3306/Yuchengtech";//建立数据库连接地址
Connection conn = DriverManager.getConnection(url, "root", "admin");//连接数据库
Statement s = conn.createStatement();
String SQL = "insert into test(name, sex,age) values(" +'"'+ "susheng" + '"' + ", 1, 25);";
s.execute(SQL);
}
public static void main(String[] args) throws SQLException, ClassNotFoundException
{
// YuchengFacetoFace yff = new YuchengFacetoFace();
// System.out.println(yff.makePackage("susheng", 0, 12));
CreateDataBase();
}
}
二、js的代码答案
<html>
<head>
<script language="javascript">
function parse()
{
var content = document.getElementById("package").value;
var name = content.substring(1,20).trim();
var sex = content.substring(20,21);
var age = content.substring(21,24);
document.getElementById("name").value = name;
document.getElementById("sex").value = sex;
document.getElementById("age").value = age;
}
</script>
</head>
<body>
<input id="package" type = "text"/>
<input type="button" onclick="parse()"/>
<input id="name" type="text"/>
<input id="sex" type="text"/>
<input id="age" type="text"/>
</body>
</html>css很简单 有个background-image:url(a.jpg);
web的答案
package com.yuchengtech;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class TestServer extends HttpServlet {
/**
* The doGet method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to get.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String Src = request.getParameter("package");
YuchengFacetoFace yff = new YuchengFacetoFace();
yff.parserPackage(Src);
}
/**
* The doPost method of the servlet. <br>
*
* This method is called when a form has its tag value method equals to post.
*
* @param request the request send by the client to the server
* @param response the response send by the server to the client
* @throws ServletException if an error occurred
* @throws IOException if an error occurred
*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String Src = request.getParameter("package");
YuchengFacetoFace yff = new YuchengFacetoFace();
yff.parserPackage(Src);
}
}