MVC实现连接数据库 实现按条件查询

mvc结构 连接数据库 类色图书馆管理系统 但不要那么复杂的 我只要里面的分类查询显示 这一块 简单的就行 给例子 谢谢 大神了哈！！！！

list页面 相当于V
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">


首页


添加学生

学号: 姓名: name="name"> 班级名称:


${bj.b_name }
/c:forEach


















/c:if


/c:if





/c:forEach
学号姓名性别生日日期爱好班级名称操作
${stu.xh}${stu.name}男女${stu.birthday}${stu.favorite}${stu.b_name}修改
删除





test="${pageNow> 1}">
上页
/c:if
下页
/c:if 当前第 /
页

$(document).ready(function() { $("#pre").click(function() { $("#form").attr('action', 'index.jsp?pageNow=${pageNow-1}'); $("#form").submit(); }); $("#next").click(function() { $("#form").attr('action', 'index.jsp?pageNow=${pageNow+1}'); $("#form").submit(); }); $("#btn").click(function() { $("#form").attr('action', 'index.jsp'); $("#form").submit(); }); });

servlet 相当于C
public class listStudent extends HttpServlet {

private static final long serialVersionUID = -6441193787541923748L;

private StudentService studentService = new StudentServiceImpl();
private BJService bJService = new BJServiceImpl();

/**
 * @Description: 处理doGet方法
 * @param req
 * @param resp
 * @throws ServletException
 * @throws IOException
 * @see javax.servlet.http.HttpServlet#doGet(javax.servlet.http.HttpServletRequest,
 *      javax.servlet.http.HttpServletResponse)
 */
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {

    // 交给doPost处理
    doPost(req, resp);
}

/**
 * @Description: 处理doPost方法
 * @param req
 * @param resp
 * @throws ServletException
 * @throws IOException
 * @see javax.servlet.http.HttpServlet#doPost(javax.servlet.http.HttpServletRequest,
 *      javax.servlet.http.HttpServletResponse)
 */
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp)
        throws ServletException, IOException {

    final int pageSize = 3;
    int pageNow = 1;
    int pageCount = 1;
    // 查询条件封装成map集合
    Map<String, String> paramsMap = new HashMap<String, String>();

    if (StringUtils.isNotBlank(req.getParameter("xh"))) {
        paramsMap.put("xh", req.getParameter("xh"));
    }
    if (StringUtils.isNotBlank(req.getParameter("name"))) {
        paramsMap.put("name", req.getParameter("name"));
    }
    if (StringUtils.isNotBlank(req.getParameter("b_no"))) {
        paramsMap.put("b_no", req.getParameter("b_no"));
    }
    // 设置当前页
    if (StringUtils.isNotBlank(req.getParameter("pageNow"))) {
        pageNow = Integer.parseInt(req.getParameter("pageNow"));
    }
    List<Student> listStudent = null;
    List<BJ> listBJ=null;
    try {
        // 根据pageSize,pageNow和parmasMap查询所有符合条件的学生
        listStudent = studentService.listStudent(pageSize, pageNow,
                paramsMap);
        listBJ=bJService.listAllBJ();
        // 获取页数
        pageCount = studentService.getCount(pageSize, paramsMap);
    } catch (Exception e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }
    // 学生数据集合
    req.setAttribute("list", listStudent);
    //班级数据集合
    req.setAttribute("listBJ", listBJ);
    // 总页数
    req.setAttribute("pageCount", pageCount);
    // 当前页
    req.setAttribute("pageNow", pageNow);

    req.getRequestDispatcher("/listStudent.jsp").forward(req, resp);
}

javaBean 相当于M
public class Student {

private int xh;// 学号
private String name;// 姓名
private int sex;// 性别，0表示男，1表示女
private String birthday;// 生日
private String favorite;// 爱好
private String b_name;// 班级名称
private int b_no;//班级号

public int getXh() {
    return xh;
}

public void setXh(int xh) {
    this.xh = xh;
}

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getSex() {
    return sex;
}

public void setSex(int sex) {
    this.sex = sex;
}

public String getBirthday() {
    return birthday;
}

public void setBirthday(String birthday) {
    this.birthday = birthday;
}

public String getFavorite() {
    return favorite;
}

public void setFavorite(String favorite) {
    this.favorite = favorite;
}

public String getB_name() {
    return b_name;
}

public void setB_name(String b_name) {
    this.b_name = b_name;
}

public int getB_no() {
    return b_no;
}

public void setB_no(int b_no) {
    this.b_no = b_no;
}

}