Hibernate全套增删改查+分页-白红宇

Hibernate全套增删改查+分页

阅读量：6154 次

发布时间：2019-06-21

本文共 31360 字，大约阅读时间需要 104 分钟。

1.创建一个web工程

2.导入jar包

3.创建Student表

4.创建实体类

package com.entity;public class Student {    private Integer sid;    private String sname;    private String password;    private String sex;    private Integer cid;        public Student() {    }    public Student(Integer sid, String sname, String password, String sex,            Integer cid) {        this.sid = sid;        this.sname = sname;        this.password = password;        this.sex = sex;        this.cid = cid;    }    public Student(String sname, String password, String sex,            Integer cid) {        this.sname = sname;        this.password = password;        this.sex = sex;        this.cid = cid;    }    public Integer getSid() {        return sid;    }    public void setSid(Integer sid) {        this.sid = sid;    }    public String getSname() {        return sname;    }    public void setSname(String sname) {        this.sname = sname;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }    public String getSex() {        return sex;    }    public void setSex(String sex) {        this.sex = sex;    }    public Integer getCid() {        return cid;    }    public void setCid(Integer cid) {        this.cid = cid;    }    @Override    public String toString() {        return "Student [cid=" + cid + ", password=" + password + ", sex="                + sex + ", sid=" + sid + ", sname=" + sname + "]";    }        }

5.配置映射文件


     
         
         
            
              
                           
                  
                                
                     
         SEQ_STUDENT

6.配置主配置文件


     
       
        
            
           
       
        oracle.jdbc.driver.OracleDriver
               
           
       
        jdbc:oracle:thin:@127.0.0.1:1521:orcl
               
           
       
        holly
                 
           
       
        sys
               
           
       
        org.hibernate.dialect.Oracle10gDialect
               
           
       
        true
               
           
       
        true

7.创建一个工具类

package com.util;import org.hibernate.HibernateException;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;/** * Hibernate打开session和关闭session的工具包 * @author Holly * */public class Hibernate_Util {    private static ThreadLocal
     
       threadLocal=new ThreadLocal
      
       ();    private static Configuration configuration=null;    private static SessionFactory sessionFactory=null;    static{             try {        configuration=new Configuration().configure("/hibernate.cfg.xml");        sessionFactory=configuration.buildSessionFactory();     } catch (HibernateException e) {         System.out.println("解析xml和创建Session工厂error");        e.printStackTrace();    }          }       public static Session getSession(){        Session session=threadLocal.get();        if(session==null){            session=sessionFactory.openSession();            threadLocal.set(session);        }        return session;    }    public static void closeSession(){        Session session=threadLocal.get();        if(session!=null){              threadLocal.set(null);              session.close();        }    }                                }

8.创建分页实体类

package com.page;public class Page {    private Integer pagesize; //页面大小    private Integer pageno; //当前页    private Integer startrow; //起始行    private Integer totalpage; //总页数    private Integer totalcount; //总条数            public Page() {    }    public Page(Integer pageSize, Integer pageNo, Integer totalCount) {        this.pagesize = pageSize; //页面大小         this.pageno = pageNo;  //当前页        this.totalcount = totalCount; //计算总条数        this.setStartrow(pageNo, pageSize); //计算起始行        this.setTotalpage(totalCount, pageSize); //计算总页数    }    public Integer getPagesize() {        return pagesize;    }    public void setPagesize(Integer pageSize) {        this.pagesize = pageSize;    }    public Integer getPageno() {        return pageno;    }    public void setPageno(Integer pageNo) {        this.pageno = pageNo;    }    public Integer getStartrow() {        return startrow;    }    /**     * 计算起始行     * @param pageNo     * @param pageSize     */    public void setStartrow(Integer pageNo,Integer pageSize) {        this.startrow = (pageNo-1)*pageSize;    }    public Integer getTotalpage() {        return totalpage;    }    /**     * 计算总页数     * @param totalCount     * @param pageSize     */    public void setTotalpage(Integer totalCount,Integer pageSize) {        this.totalpage = totalCount%pageSize==0?totalCount/pageSize:totalCount/pageSize+1;    }    public Integer getTotalcount() {        return totalcount;    }    public void setTotalCount(Integer totalCount) {        this.totalcount = totalCount;    }    @Override    public String toString() {        return "[{\"pageno\":" + pageno + ",\"pagesize\":" + pagesize                + ",\"startrow\":" + startrow + ",\"totalcount\":" + totalcount                + ",\"totalpage\":" + totalpage + "}]";    }            }

9.创建Dao类

package com.dao;import java.util.List;import com.entity.Student;import com.page.Page;public interface StudentDao {    /**     * 1.根据用户名和密码查询     * @param sname     * @param password     * @return     */    Student findByNameAndPwd(String sname,String password);    /**     * 2.延时加载:查询所有     * @return     */    List
     
       findAll();    /**     * 3.保存     * @param stu     * @return     */    int save(Student stu);    /**     * 4.根据主键id查询单条     * @param sid     * @return     */    Student findById(Integer sid);    /**     * 5.修改     */    int update(Student stu);    /**     * 6.删除对象     * @param stu     * @return     */    int delete(Student stu);    /**     * 7.分页查询     */    List
      
        findPage(Page page);    /**     * 8.查询总条数     */    int getTotalCount();            }

10.实现Dao接口

package com.dao.impl;import java.util.List;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.Session;import com.dao.StudentDao;import com.entity.Student;import com.page.Page;import com.util.Hibernate_Util;public class StudentDaoImpl implements StudentDao{    /**     * 1.查询所有:立即加载     */    public List
     
       findAll() {        //1.获取session对象        Session session=Hibernate_Util.getSession();        //2.定义hql语句        String hql="from Student";        //3.Session创建Query对象        Query query=session.createQuery(hql);        //4.query对象执行操作        List
      
        it=query.list();        //5.释放资源        Hibernate_Util.closeSession();        return it;    }    /**     * 2.根据用户名和密码查询     */    public Student findByNameAndPwd(String sname, String password) {        //1.获取session对象        Session session=Hibernate_Util.getSession();        //2.定义hql语句(命名参数)        String hql="from Student where sname=:sname and password=:password";        //3.Session创建Query对象        Query query=session.createQuery(hql);        //4.query对象给占位符赋值        /*query.setString("sname", sname);        query.setString("password", password);*/        query.setParameter("sname", sname);        query.setParameter("password", password);    //        query.setProperties(user);        //5.执行操作(uniqueResult()查询的单行数据)        Student stu=(Student) query.uniqueResult();        //6.释放资源        Hibernate_Util.closeSession();        return stu;            }       /**    * 根据id主键查询单条    */    public Student findById(Integer sid) {        //1.获取session对象        Session session=Hibernate_Util.getSession();        //2.利用session根据主键查询        Student stu=(Student) session.get(Student.class, sid);        /*3.         * 因为在修改时要提前查询单条,和session关联已经变成持久化对象,         * 而在修改时session执行update方法时,         * 首先会查询该主键id是否存在,         * 如果存在,则根据主键id修改该对象,此时对象已经处于持久化对象,         * 而实际session中不能同时存在两个主键id相同的对象,         * 否则会出现如下错误:         * org.hibernate.NonUniqueObjectException:          * a different object with the same identifier          * value was already associated with the          * session: [com.entity.Student#1]         */          Hibernate_Util.closeSession();         // session.clear();        return stu;    }    /**     * 删除对象     */    public int delete(Student stu) {        int num=1;        //1.获取session对象        Session session=Hibernate_Util.getSession();                try {            //session删除操作            session.delete(stu);            session.beginTransaction().commit();        } catch (HibernateException e) {             num=0;            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            //5.释放资源            Hibernate_Util.closeSession();        }                return num;    }    /**     * 添加     */    public int save(Student stu) {        int num=1;        //1.获取session对象        Session session=Hibernate_Util.getSession();        //执行操作        try {            session.save(stu);            session.beginTransaction().commit();        } catch (HibernateException e) {            num=0;            e.printStackTrace();        }finally{            //5.释放资源            Hibernate_Util.closeSession();        }        return num;    }   /**    * 修改    */    public int update(Student stu) {        int num=1;        //1.获取session对象        Session session=Hibernate_Util.getSession();        try {            //执行操作            //该对象的主键id必须存在            session.update(stu);            session.beginTransaction().commit();        } catch (HibernateException e) {            num=0;            e.printStackTrace();        }finally{            //5.释放资源            Hibernate_Util.closeSession();        }        return num;    }    /**     * 7.分页查询     */public List
       
         findPage(Page page) {    //1.获取session    Session session=Hibernate_Util.getSession();        //2.定义查询最大记录数的hql    String hql="from Student";        //3.定义查询最大记录数的Query对象    Query querypage=session.createQuery(hql);        //4.查询最大记录数的数据    querypage.setMaxResults(page.getPagesize());        //5.确定查询起点    querypage.setFirstResult(page.getStartrow());        //6.分页查询    List
        
          list=querypage.list();        //7.关闭session    Hibernate_Util.closeSession();        return list;}/** * 8.查询总条数 */public int getTotalCount() {    //1.获取session    Session session=Hibernate_Util.getSession();        //2.定义查询总条数hql语句    String hqlcount="select count(*) from Student";        //3.利用Session创建Query对象    Query querycount=session.createQuery(hqlcount);        //4.获取总条数(返回单行数据uniqueResult())    Integer totalCount=Integer.parseInt(querycount.uniqueResult().toString());    //5.释放资源    Hibernate_Util.closeSession();    return totalCount;}    }

11.创建业务层的接口

package com.service;import java.util.List;import com.entity.Student;import com.page.Page;/** * 业务接口 * @author pc * */public interface StudentService {    /**     * 1.登录的业务     * @param sname     * @param password     * @return     */    Student login(String sname,String password);    /**     * 2.注册     * @param stu     * @return     */    int register(Student stu);        /**     * 3.查询所有     */    List
     
       findAll();    /**     * 4.根据主键id查询     * @param sid     * @return     */    Student findById(Integer sid);    /**     * 5.修改     */    int update(Student stu);    /**     * 6.删除     */    int delete(Student stu);        /**     * 7.分页查询     */    List
      
        findPage(Page page);    /**     * 8.查询总条数     */    int getTotalCount();    }

12.实现业务层接口

package com.service.impl;import java.util.List;import com.dao.StudentDao;import com.dao.impl.StudentDaoImpl;import com.entity.Student;import com.page.Page;import com.service.StudentService;public class StudentServiceImpl implements StudentService {    /**     * 使用多态引用数据访问层对象     */    private StudentDao dao = new StudentDaoImpl();    /**     * 登录     */    public Student login(String sname, String password) {        return dao.findByNameAndPwd(sname, password);    }    public int delete(Student stu) {        // TODO Auto-generated method stub        return dao.delete(stu);    }    public List
     
       findAll() {        // TODO Auto-generated method stub        return dao.findAll();    }    public Student findById(Integer sid) {        // TODO Auto-generated method stub        return dao.findById(sid);    }    public int register(Student stu) {        // TODO Auto-generated method stub        return dao.save(stu);    }    public int update(Student stu) {        // TODO Auto-generated method stub        return dao.update(stu);    }    public List
      
        findPage(Page page) {        // TODO Auto-generated method stub        return dao.findPage(page);    }    public int getTotalCount() {        // TODO Auto-generated method stub        return dao.getTotalCount();    }}

13.创建Servlet类

Servlet类里的增删改查我是分开写的,所以就不一一粘贴代码,这里只粘贴部分

package com.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Student;import com.service.StudentService;import com.service.impl.StudentServiceImpl;public class RegisterServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");        // 2.接受参数        String sname = request.getParameter("sname");        String password = request.getParameter("password");        String sex = request.getParameter("sex");        Integer cid = Integer.valueOf(request.getParameter("cid"));        Student stu = new Student(sname, password, sex, cid);        // 3.业务处理        StudentService service = new StudentServiceImpl();        int num = service.register(stu);        if (num > 0) {            System.out.println("register success!");            response.sendRedirect("FindAllServlet");        } else {            System.out.println("register fail!");        }    }}

package com.servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import org.codehaus.jackson.map.ObjectMapper;import com.entity.Student;import com.page.Page;import com.service.StudentService;import com.service.impl.StudentServiceImpl;/** * 分页查询 *  * @author pc *  */public class FindPageServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        response.setContentType("text/html;charset=UTF-8");        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        /**         * ☆         * 在使用ajax往前台通过输出流对象的print方法发送json时         * 该行获取输出流对象的代码必须放在         * response.setContentType("text/html;charset=UTF-8");         * 之后,否则ajax回调时,页面拿到的中文数据就永远都是乱码,         * 原因是:如果将改行代码写在处理客户端乱码之前,表示编码格式已经确定,         * 所以,编码格式的处理应该放在获取PrintWriter对象之前         *          */        PrintWriter out=response.getWriter();                // 2.接受参数        String no=request.getParameter("pageNo");                // 3.业务处理        StudentService service = new StudentServiceImpl();                int pageSize=3; //页面大小        int pageNo=1; //默认的pageNo为1        if(no!=null && no!=""){            pageNo=Integer.valueOf(no);        }        //获取总条数        int totalCount=service.getTotalCount();        //封装分页所需字段        Page page=new Page(pageSize, pageNo, totalCount);        //分页查询        List
     
       list = service.findPage(page);                ObjectMapper om=new ObjectMapper();        String str=om.writeValueAsString(list);        String pagestr=om.writeValueAsString(page);        str="{\"page\":"+pagestr+",\"list\":"+str+"}";        System.out.println(str);                out.print(str);        /*if (list != null) {            System.out.println("find page success");            request.setAttribute("list", list);            request.setAttribute("page", page);            request.getRequestDispatcher("index.jsp").forward(request, response);        } else {            System.out.println("find page fail!");        }*/    }}

package com.servlet;import java.io.IOException;import java.io.PrintWriter;import java.util.List;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Student;import com.page.Page;import com.service.StudentService;import com.service.impl.StudentServiceImpl;public class FindAllServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {       this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");                /**         * ☆         * 在使用ajax往前台通过输出流对象的print方法发送json时         * 该行获取输出流对象的代码必须放在         * response.setContentType("text/html;charset=UTF-8");         * 之后,否则ajax回调时,页面拿到的中文数据就永远都是乱码,         * 原因是:如果将改行代码写在处理客户端乱码之前,表示编码格式已经确定,         * 所以,编码格式的处理应该放在获取PrintWriter对象之前         *          */        // 2.接受参数        String no=request.getParameter("pageNo");                // 3.业务处理        StudentService service = new StudentServiceImpl();                int pageSize=3; //页面大小        int pageNo=1; //默认的pageNo为1        if(no!=null && no!=""){            pageNo=Integer.valueOf(no);        }        //获取总条数        int totalCount=service.getTotalCount();        Page page=new Page(pageSize, pageNo, totalCount);                List
     
       list = service.findPage(page);        if(list!=null){             System.out.println("find All page success");              request.setAttribute("list", list);              request.setAttribute("page", page);              request.getRequestDispatcher("index.jsp").forward(request, response);        }else{            System.out.println("find All page fail!");        }    }                }

代码

package com.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Student;import com.service.StudentService;import com.service.impl.StudentServiceImpl;public class LoginServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {       this.doPost(request, response);    }        public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");                //2.接受参数        String sname=request.getParameter("sname");        String password=request.getParameter("password");        //3.业务处理        StudentService service=new StudentServiceImpl();        Student stu=service.login(sname, password);        if(stu!=null){            System.out.println("login success!");            //4.页面跳转            request.getSession().setAttribute("sname", sname);            response.sendRedirect("FindAllServlet");        }else{            System.out.println("login fail!");                    }    }}

package com.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Student;import com.service.StudentService;import com.service.impl.StudentServiceImpl;import com.util.Hibernate_Util;public class FindByIdSerlvet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");        // 2.接受参数        Integer sid=Integer.valueOf(request.getParameter("sid"));                // 3.业务处理        StudentService service = new StudentServiceImpl();                  Student stu=service.findById(sid);         System.out.println("stu:"+stu);         if(stu!=null){             System.out.println("根据id查询到对象");             request.setAttribute("stu", stu);             request.getRequestDispatcher("update.jsp").forward(request, response);         }else{             System.out.println("没有根据id查询到对象");         }    }}

package com.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Student;import com.service.StudentService;import com.service.impl.StudentServiceImpl;public class UpdateServlet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");        // 2.接受参数        Integer sid=Integer.valueOf(request.getParameter("sid"));        String sname = request.getParameter("sname");        String password = request.getParameter("password");        String sex = request.getParameter("sex");        Integer cid=Integer.valueOf(request.getParameter("cid"));        Student stu=new Student(sid,sname, password, sex, cid);                // 3.业务处理        StudentService service = new StudentServiceImpl();        int num=service.update(stu);        if(num>0){            System.out.println("update success!");            response.sendRedirect("FindAllServlet");        }else{            System.out.println("update fail!");        }    }}

package com.servlet;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Student;import com.service.StudentService;import com.service.impl.StudentServiceImpl;public class DeleteSerlvet extends HttpServlet {    private static final long serialVersionUID = 1L;    public void doGet(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        this.doPost(request, response);    }    public void doPost(HttpServletRequest request, HttpServletResponse response)            throws ServletException, IOException {        request.setCharacterEncoding("UTF-8");        response.setCharacterEncoding("UTF-8");        response.setContentType("text/html;charset=UTF-8");        // 2.接受参数        Integer sid=Integer.valueOf(request.getParameter("sid"));        // 3.业务处理        StudentService service = new StudentServiceImpl();        Student stu=service.findById(sid);        if (stu != null) {            System.out.println("根据id查询成功");             int num=service.delete(stu);             if(num>0){                 System.out.println("delete success!!");                 // 4.页面跳转                 response.sendRedirect("FindAllServlet");                              }else{                 System.out.println("delete success!!");                              }        } else {            System.out.println("根据id查询失败!");        }    }}

14.配置web.xml


     
           
          
       
        LoginServlet
           
       
        com.servlet.LoginServlet
         
        
          
       
        FindAllServlet
           
       
        com.servlet.FindAllServlet
         
        
          
       
        FindByIdSerlvet
           
       
        com.servlet.FindByIdSerlvet
         
        
          
       
        UpdateServlet
           
       
        com.servlet.UpdateServlet
         
        
          
       
        DeleteSerlvet
           
       
        com.servlet.DeleteSerlvet
         
        
          
       
        RegisterServlet
           
       
        com.servlet.RegisterServlet
         
        
          
       
        FindPageServlet
           
       
        com.servlet.FindPageServlet
         
        
          
       
        LoginServlet
           
       
        /LoginServlet
         
        
          
       
        FindAllServlet
           
       
        /FindAllServlet
         
        
          
       
        FindByIdSerlvet
           
       
        /FindByIdSerlvet
         
        
          
       
        UpdateServlet
           
       
        /UpdateServlet
         
        
          
       
        DeleteSerlvet
           
       
        /DeleteSerlvet
         
        
          
       
        RegisterServlet
           
       
        /RegisterServlet
         
        
          
       
        FindPageServlet
           
       
        /FindPageServlet
         
        
          
       
        login.jsp

15.首页

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%>                    My JSP 'index.jsp' starting page        
             
             
             
             
             
                 
             
      学生信息表
        
                      
      
      
       style="background-color:orange;"
      
      
         >                    
                                                                        序号                                                             姓名                                                             性别                                                             操作                                    
                                                                 ${i.sid }                                                                         ${i.sname }                                                                         ${i.sex }                                                                         添加                                                  修改                                                  删除                                                                    
                                       
      
        
      
                               第${page.pageno}/${page.totalpage}页           
       首页        
                 
                    
         上一页          
                  
                    
         上一页          
                
               
                 
                    
         下一页          
                  
                    
         下一页          
                
                       
       末页                  共${page.totalcount}条

16.登录页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%>                    My JSP 'index.jsp' starting page        
             
             
             
             
             
                     
                 
                      
                           登录                                
                           
        
                                                        用户名:                          
                                               密码:

17.注册页面

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%>                    My JSP 'index.jsp' starting page        
             
             
             
             
             
                      
                 
                      
                            注册                                 
                           
        
                                                        用户名:                          
                                               密码:                          
                                               性别:              男 女            
                                               班级编号:

18.修改

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%><%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %><%    String path = request.getContextPath();    String basePath = request.getScheme() + "://"            + request.getServerName() + ":" + request.getServerPort()            + path + "/";%>                    My JSP 'index.jsp' starting page        
             
             
             
             
             
                      
                 
                      
                             
修改                                  
                           
        
                                                        用户名:                          
                                               密码:                          
                                               性别:              
             
              
              男 
              女 
              
              
              男 
              女 
              
                        
                                               班级编号: