package com.service;/**  * 負責學生信息的所有數據庫操作，增刪改查 */import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.sql.SQLException;import java.util.ArrayList;import java.util.List; import com.model.stuInfo; public class stuInfoService { private Connection conn; private PreparedStatement pstmt;//執行sql語句  public stuInfoService() {  conn = new com.conn.conn().getCon(); }  public boolean addStu(stuInfo stu) {//插入學生數據  try {   pstmt = conn.prepareStatement("insert into studentinfo"     + "(Nickname,truename,sex,birthday,major,course,interest,remark) "     + "values(?,?,?,?,?,?,?,?)");   pstmt.setString(1, stu.getNickname());   pstmt.setString(2, stu.getTruename());   pstmt.setByte(3, stu.getSex());   pstmt.setString(4, stu.getbirthday());   pstmt.setString(5, stu.getmajor());   pstmt.setString(6, stu.getcourses());   pstmt.setString(7, stu.getinterests());   pstmt.setString(8, stu.getremark());    pstmt.executeUpdate();   return true;  } catch (SQLException e) {   // TODO Auto-generated catch block    e.printStackTrace();   return false;  }  }//查詢所喲學生信息 public List<stuInfo> queryAllStu() {//查詢學生數據  List<stuInfo> stus = new ArrayList<stuInfo>();//每一個學生的信息作為list集合的每一個元素存儲在list集合中  try {   pstmt = conn.prepareStatement("select * from studentinfo");   ResultSet rs = pstmt.executeQuery();   while (rs.next()) {    stuInfo stu = new stuInfo();    stu.setId(rs.getInt(1));    stu.setNickname(rs.getString(2));    stu.setTruename(rs.getString(3));    stu.setSex(rs.getByte(4));    if (rs.getDate(5) != null)     stu.setbirthday(rs.getDate(5).toString());    stu.setmajor(rs.getString(6));    if (rs.getString(7) != null)     stu.setcourse(rs.getString(7).split("&"));    if (rs.getString(8) != null)     stu.setinterest(rs.getString(8).split("&"));    stu.setremark(rs.getString(9));    stus.add(stu);    }   return stus;   } catch (SQLException e) {   // TODO Auto-generated catch block   e.printStackTrace();   return null;  }  }//查詢單個學生信息 public stuInfo queryStubyID(int id) {  // List stus = new ArrayList();  try {   pstmt = conn     .prepareStatement("select * from studentinfo where id=?");   pstmt.setInt(1, id);   ResultSet rs = pstmt.executeQuery();   if (rs.next()) {    stuInfo stu = new stuInfo();    stu.setId(rs.getInt(1));    stu.setNickname(rs.getString(2));    stu.setTruename(rs.getString(3));    stu.setSex(rs.getByte(4));    if (rs.getDate(5) != null)     stu.setbirthday(rs.getDate(5).toString());    stu.setmajor(rs.getString(6));    if (rs.getString(7) != null)     stu.setcourse(rs.getString(7).split("&"));    if (rs.getString(8) != null)     stu.setinterest(rs.getString(8).split("&"));    stu.setremark(rs.getString(9));    // stus.add(stu);    return stu;    }   return null;   } catch (SQLException e) {   // TODO Auto-generated catch block   e.printStackTrace();   return null;  }  }  //更新學生信息 public boolean updateStu(stuInfo stu) {   try {   pstmt = conn     .prepareStatement("update studentinfo set Nickname=? , truename=? , sex=? ,birthday=? ,"       + " major=? ,course=? , interest=?, remark=? where id=?");   pstmt.setString(1, stu.getNickname());   pstmt.setString(2, stu.getTruename());   pstmt.setByte(3, stu.getSex());   pstmt.setString(4, stu.getbirthday());   pstmt.setString(5, stu.getmajor());   pstmt.setString(6, stu.getcourses());   pstmt.setString(7, stu.getinterests());   pstmt.setString(8, stu.getremark());   pstmt.setInt(9, stu.getId());   pstmt.executeUpdate();   return true;  } catch (SQLException e) {   // TODO Auto-generated catch block   e.printStackTrace();   return false;  } }  //刪除學生信息 public Boolean deleteStu(int id) {   try {   pstmt = conn.prepareStatement("delete from studentinfo where id=?");   pstmt.setInt(1, id);   pstmt.executeUpdate();   return true;  } catch (Exception e) {   e.getStackTrace();   return false;  }  }}

package com.servlet; import java.io.IOException;import java.io.PrintWriter;import java.util.Date; import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse; import com.model.stuInfo;import com.service.stuInfoService; public class inputStuInfoServlet extends HttpServlet {  /**  * Constructor of the object.  */ public inputStuInfoServlet() {  super(); }  /**  * Destruction of the servlet. <br>  */ public void destroy() {  super.destroy(); // Just puts "destroy" string in log  // Put your code here }  /**  * 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 {   doPost(request, response); }  /**  * 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 {  request.setCharacterEncoding("utf-8");//get到表單所有的控件的值  String nickname=request.getParameter("nickname");  String truename=request.getParameter("truename");  byte sex=Byte.parseByte(request.getParameter("sex"));  String birthday=request.getParameter("birthday");  String major=request.getParameter("major");  System.out.println(major);  //String course=request.getParameter("course");  String courses[]=request.getParameterValues("course");  String interests[]=request.getParameterValues("interest");  String remark=request.getParameter("remark");  //放到Javabean中暫時保存  stuInfo stu=new stuInfo();  stu.setNickname(nickname);  stu.setTruename(truename);     stu.setbirthday(birthday);  if(birthday.equals(""))   stu.setbirthday(null);  if(courses!=null)  stu.setcourse(courses);  if(interests!=null)  stu.setinterest(interests);  stu.setremark(remark);  stu.setmajor(major);  stu.setSex(sex);  if(new stuInfoService().addStu(stu))//插入學生數據的方法   response.sendRedirect("../inputStuInfo_success.jsp");  else   response.sendRedirect("../inputStuInfo.jsp");//插入數據庫失敗則返回初始輸入頁面    }  /**  * Initialization of the servlet. <br>  *  * @throws ServletException if an error occurs  */ public void init() throws ServletException {  // Put your code here } }

package com.model;//Javabean相當于是一個中間件，用于類與類之間，各層之間的中轉數據的一個中轉站public class stuInfo { private int id; private String nickname; private String truename; private byte sex; private String birthday; private String major; private String[] course = { "" }; private String courses = ""; private String[] interest = { "" }; private String interests = ""; private String remark; public int getId() {  return id; } public void setId(int id) {  this.id = id; } public String getNickname() {  return nickname; } public void setNickname(String nickname) {  this.nickname = nickname; } public String getTruename() {  return truename; } public void setTruename(String truename) {  this.truename = truename; } public byte getSex() {  return sex; } public void setSex(byte sex) {  this.sex = sex; } public String getbirthday() {  return birthday; } public void setbirthday(String birthday) {  this.birthday = birthday; } public String getmajor() {  return major; } public void setmajor(String major) {  this.major = major; } public String[] getcourse() {  return course; } public void setcourse(String[] course) {  this.course = course; } public String getcourses() {   if(course!=null)  {courses="";   for(int i=0;i<course.length;i++)   courses+=course[i]+"&";  }  courses=courses.substring(0,courses.length()-1);  return courses; } public void setcourses(String courses) {  this.courses = courses; } public String[] getinterest() {  return interest; } public void setinterest(String[] interest) {  this.interest = interest; } public String getinterests() {  if(interest!=null)  {interests="";   for(int i=0;i<interest.length;i++)   interests+=interest[i]+"&";  }  interests=interests.substring(0,interests.length()-1);  return interests; } public void setinterests(String interests) {  this.interests = interests; } public String getremark() {  return remark; } public void setremark(String remark) {  this.remark = remark; }}

package com.conn; import java.sql.Connection;import java.sql.DriverManager; public class conn {  public Connection getCon() {  try {   Class.forName("com.mysql.jdbc.Driver");   String url = "jdbc:mysql://localhost/Stu_info_System?useUnicode=true&characterEncoding=utf-8";   String user = "root";   String password = "root";   Connection conn = DriverManager.getConnection(url, user, password);   System.out.println(conn.getMetaData().getURL());    return conn;  } catch (Exception e) {   e.printStackTrace();   return null;  }  } }