packagecom.hjf.dao;importjava.sql.Connection;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;importjava.util.ArrayList;importjava.util.List;importcom.hjf.entity.Course;importcom.hjf.util.DBUtil;/*** 课程Dao

* Dao层操作数据

*@authorHu

**/

public classCourseDao {/*** 添加

*@paramcourse

*@return

*/

public booleanadd(Course course) {

String sql= "insert into course(name, sex,minzu,zhuce,age,zhengzhi,fuwu) values('" + course.getName() + "','" + course.getSex() + "','" + course.getMinzu() + "','" + course.getZhuce()+ "','" + course.getAge() + "','" + course.getZhengzhi() + "','" + course.getFuwu() + "')";//创建数据库链接

Connection conn =DBUtil.getConn();

Statement state= null;boolean f = false;int a = 0;try{

state=conn.createStatement();

state.executeUpdate(sql);

}catch(Exception e) {

e.printStackTrace();

}finally{//关闭连接

DBUtil.close(state, conn);

}if (a > 0) {

f= true;

}returnf;

}/*** 删除

*

*@paramid

*@return

*/

public boolean delete (intid) {boolean f = false;

String sql= "delete from course where id='" + id + "'";

Connection conn=DBUtil.getConn();

Statement state= null;int a = 0;try{

state=conn.createStatement();

a=state.executeUpdate(sql);

}catch(SQLException e) {

e.printStackTrace();

}finally{

DBUtil.close(state, conn);

}if (a > 0) {

f= true;

}returnf;

}/*** 修改

*@paramname

*@parampass*/

public booleanupdate(Course course) {

String sql= "update course set name='" + course.getName() + "', sex='" + course.getSex() + "', minzu='" + course.getMinzu()+ "', zhuce='" + course.getZhuce()+ "', age='" + course.getAge()+ "', zhengzhi='" + course.getZhengzhi()+ "', fuwu='" +course.getFuwu()+ "' where id='" + course.getId() + "'";

Connection conn=DBUtil.getConn();

Statement state= null;boolean f = false;int a = 0;try{

state=conn.createStatement();

a=state.executeUpdate(sql);

}catch(SQLException e) {

e.printStackTrace();

}finally{

DBUtil.close(state, conn);

}if (a > 0) {

f= true;

}returnf;

}/*** 验证课程名称是否唯一

* true --- 不唯一

*@paramname

*@return

*/

public booleanname(String name) {boolean flag = false;

String sql= "select name from course where name = '" + name + "'";

Connection conn=DBUtil.getConn();

Statement state= null;

ResultSet rs= null;try{

state=conn.createStatement();

rs=state.executeQuery(sql);while(rs.next()) {

flag= true;

}

}catch(SQLException e) {

e.printStackTrace();

}finally{

DBUtil.close(rs, state, conn);

}returnflag;

}/*** 通过ID得到课程信息

*@paramid

*@return

*/

public Course getCourseById(intid) {

String sql= "select * from course where id ='" + id + "'";

Connection conn=DBUtil.getConn();

Statement state= null;

ResultSet rs= null;

Course course= null;try{

state=conn.createStatement();

rs=state.executeQuery(sql);while(rs.next()) {

String name= rs.getString("name");

String sex= rs.getString("sex");

String minzu= rs.getString("minzu");

String zhuce= rs.getString("zhuce");

String age= rs.getString("age");

String zhengzhi= rs.getString("zhengzhi");

String fuwu= rs.getString("fuwu");

course= newCourse(id, name, sex, minzu,zhuce,age,zhengzhi,fuwu);

}

}catch(Exception e) {

e.printStackTrace();

}finally{

DBUtil.close(rs, state, conn);

}returncourse;

}/*** 通过name得到Course

*@paramname

*@return

*/

publicCourse getCourseByName(String name) {

String sql= "select * from course where name ='" + name + "'";

Connection conn=DBUtil.getConn();

Statement state= null;

ResultSet rs= null;

Course course= null;try{

state=conn.createStatement();

rs=state.executeQuery(sql);while(rs.next()) {int id = rs.getInt("id");

String sex= rs.getString("sex");

String minzu= rs.getString("minzu");

String zhuce= rs.getString("zhuce");

String age= rs.getString("age");

String zhengzhi= rs.getString("zhengzhi");

String fuwu= rs.getString("fuwu");

course= newCourse(id, name, sex, minzu,zhuce,age,zhengzhi,fuwu);

}

}catch(Exception e) {

e.printStackTrace();

}finally{

DBUtil.close(rs, state, conn);

}returncourse;

}/*** 查找

*@paramname

*@paramteacher

*@paramclassroom

*@return

*/

public Listsearch(String name, String sex, String minzu, String zhuce, String age, String zhengzhi, String fuwu) {

String sql= "select * from course where ";if (name != ""&&sex !=""&&minzu!=""&&zhuce!=""&&age!=""&&zhengzhi!=""&&fuwu!="") {

sql+= "name like '%" + name + "%'&&sex like '%" + sex + "%'&&minzu like '%" + minzu + "%'&&zhuce like '%" + zhuce + "%'&&age like '%" + age + "%'&&zhengzhi like '%" + zhengzhi + "%'&&fuwu like '%" + fuwu + "%'";

}if (sex != "") {

sql+= "sex like '%" + sex + "%'";

}if (minzu != "") {

sql+= "minzu like '%" + minzu + "%'";

}if (zhuce != "") {

sql+= "zhuce like '%" + zhuce + "%'";

}if (age != "") {

sql+= "age like '%" + age + "%'";

}if (zhengzhi != "") {

sql+= "zhengzhi like '%" + zhengzhi + "%'";

}if (fuwu != "") {

sql+= "fuwu like '%" + fuwu + "%'";

}

List list = new ArrayList<>();

Connection conn=DBUtil.getConn();

Statement state= null;

ResultSet rs= null;try{

state=conn.createStatement();

rs=state.executeQuery(sql);

Course bean= null;while(rs.next()) {int id = rs.getInt("id");

String name2= rs.getString("name");

String sex2= rs.getString("sex");

String minzu2= rs.getString("minzu");

String zhuce2= rs.getString("zhuce");

String age2= rs.getString("age");

String zhengzhi2= rs.getString("zhengzhi");

String fuwu2= rs.getString("fuwu");

bean= newCourse(id, name2, sex2, minzu2,zhuce2,age2,zhengzhi2,fuwu2);

list.add(bean);

}

}catch(SQLException e) {

e.printStackTrace();

}finally{

DBUtil.close(rs, state, conn);

}returnlist;

}/*** 全部数据

*@paramname

*@paramteacher

*@paramclassroom

*@return

*/

public Listlist() {

String sql= "select * from course";

List list = new ArrayList<>();

Connection conn=DBUtil.getConn();

Statement state= null;

ResultSet rs= null;try{

state=conn.createStatement();

rs=state.executeQuery(sql);

Course bean= null;while(rs.next()) {int id = rs.getInt("id");

String name2= rs.getString("name");

String sex2= rs.getString("sex");

String minzu2= rs.getString("minzu");

String zhuce2= rs.getString("zhuce");

String age2= rs.getString("age");

String zhengzhi2= rs.getString("zhengzhi");

String fuwu2= rs.getString("fuwu");

bean= newCourse(id, name2, sex2, minzu2,zhuce2,age2,zhengzhi2,fuwu2);

list.add(bean);

}

}catch(SQLException e) {

e.printStackTrace();

}finally{

DBUtil.close(rs, state, conn);

}returnlist;

}

}packagecom.hjf.entity;public classCourse {private intid;privateString name;privateString sex;privateString minzu;privateString zhuce;privateString age;privateString zhengzhi;privateString fuwu;public intgetId() {returnid;

}public void setId(intid) {this.id =id;

}publicString getName() {returnname;

}public voidsetName(String name) {this.name =name;

}publicString getSex() {returnsex;

}public voidsetSex(String sex) {this.sex =sex;

}publicString getMinzu() {returnminzu;

}public voidsetMinzu(String minzu) {this.minzu =minzu;

}publicString getZhuce() {returnzhuce;

}public voidsetZhuce(String zhuce) {this.zhuce =zhuce;

}publicString getAge() {returnage;

}public voidsetAge(String age) {this.age =age;

}publicString getZhengzhi() {returnzhengzhi;

}public voidsetZhengzhi(String zhengzhi) {this.zhengzhi =zhengzhi;

}publicString getFuwu() {returnfuwu;

}public voidsetFuwu(String fuwu) {this.fuwu =fuwu;

}publicCourse() {}public Course(intid, String name, String sex, String minzu,String zhuce, String age, String zhengzhi,String fuwu) {this.id =id;this.name =name;this.sex =sex;this.minzu =minzu;this.zhuce =zhuce;this.age =age;this.zhengzhi =zhengzhi;this.fuwu =fuwu;

}publicCourse(String name, String sex, String minzu,String zhuce, String age, String zhengzhi,String fuwu) {this.name =name;this.sex =sex;this.minzu =minzu;this.zhuce =zhuce;this.age =age;this.zhengzhi =zhengzhi;this.fuwu =fuwu;

}

}packagecom.hjf.service;importjava.util.List;importcom.hjf.dao.CourseDao;importcom.hjf.entity.Course;/*** CourseService

* 服务层

*@authorHu

**/

public classCourseService {

CourseDao cDao= newCourseDao();/*** 添加

*@paramcourse

*@return

*/

public booleanadd(Course course) {boolean f = false;if(!cDao.name(course.getName())) {

cDao.add(course);

f= true;

}returnf;

}/*** 删除*/

public void del(intid) {

cDao.delete(id);

}/*** 修改

*@return

*/

public voidupdate(Course course) {

cDao.update(course);

}/*** 通过ID得到一个Course

*@return

*/

public Course getCourseById(intid) {returncDao.getCourseById(id);

}/*** 通过Name得到一个Course

*@return

*/

publicCourse getCourseByName(String name) {returncDao.getCourseByName(name);

}/*** 查找

*@return

*/

public Listsearch(String name, String sex, String minzu,String zhuce, String age, String zhengzhi,String fuwu) {returncDao.search( name, sex, minzu,zhuce, age, zhengzhi,fuwu);

}/*** 全部数据

*@return

*/

public Listlist() {returncDao.list();

}

}packagecom.hjf.servlet;importjava.io.IOException;importjava.util.List;importjavax.servlet.ServletException;importjavax.servlet.annotation.WebServlet;importjavax.servlet.http.HttpServlet;importjavax.servlet.http.HttpServletRequest;importjavax.servlet.http.HttpServletResponse;importcom.hjf.entity.Course;importcom.hjf.service.CourseService;

@WebServlet("/CourseServlet")public class CourseServlet extendsHttpServlet {private static final long serialVersionUID = 1L;

CourseService service= newCourseService();/*** 方法选择*/

protected void service(HttpServletRequest req, HttpServletResponse resp) throwsServletException, IOException {

req.setCharacterEncoding("utf-8");

String method= req.getParameter("method");if ("add".equals(method)) {

add(req, resp);

}else if ("del".equals(method)) {

del(req, resp);

}else if ("update".equals(method)) {

update(req, resp);

}else if ("search".equals(method)) {

search(req, resp);

}else if ("getcoursebyid".equals(method)) {

getCourseById(req, resp);

}else if ("getcoursebyname".equals(method)) {

getCourseByName(req, resp);

}else if ("list".equals(method)) {

list(req, resp);

}

}/*** 添加

*@paramreq

*@paramresp

*@throwsIOException

*@throwsServletException*/

private void add(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException {

req.setCharacterEncoding("utf-8");//获取数据

String name = req.getParameter("name");

String sex= req.getParameter("sex");

String minzu= req.getParameter("minzu");

String zhuce= req.getParameter("zhuce");

String age= req.getParameter("age");

String zhengzhi= req.getParameter("zhengzhi");

String fuwu= req.getParameter("fuwu");

Course course= newCourse(name, sex, minzu,zhuce, age, zhengzhi,fuwu);//添加后消息显示

if(service.add(course)) {

req.setAttribute("message", "添加成功");

req.getRequestDispatcher("add.jsp").forward(req,resp);

}else{

req.setAttribute("message", "课程名称重复，请重新录入");

req.getRequestDispatcher("add.jsp").forward(req,resp);

}

}/*** 全部

*@paramreq

*@paramresp

*@throwsServletException*/

private void list(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{

req.setCharacterEncoding("utf-8");

List courses =service.list();

req.setAttribute("courses", courses);

req.getRequestDispatcher("list.jsp").forward(req,resp);

}/*** 通过ID得到Course

*@paramreq

*@paramresp

*@throwsServletException*/

private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{

req.setCharacterEncoding("utf-8");int id = Integer.parseInt(req.getParameter("id"));

Course course=service.getCourseById(id);

req.setAttribute("course", course);

req.getRequestDispatcher("detail2.jsp").forward(req,resp);

}/*** 通过名字查找

* 跳转至删除

*@paramreq

*@paramresp

*@throwsIOException

*@throwsServletException*/

private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{

req.setCharacterEncoding("utf-8");

String name= req.getParameter("name");

Course course=service.getCourseByName(name);if(course == null) {

req.setAttribute("message", "查无此课程！");

req.getRequestDispatcher("del.jsp").forward(req,resp);

}else{

req.setAttribute("course", course);

req.getRequestDispatcher("detail.jsp").forward(req,resp);

}

}/*** 删除

*@paramreq

*@paramresp

*@throwsIOException

*@throwsServletException*/

private void del(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{

req.setCharacterEncoding("utf-8");int id = Integer.parseInt(req.getParameter("id"));

service.del(id);

req.setAttribute("message", "删除成功！");

req.getRequestDispatcher("del.jsp").forward(req,resp);

}/*** 修改

*@paramreq

*@paramresp

*@throwsIOException

*@throwsServletException*/

private void update(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{

req.setCharacterEncoding("utf-8");int id = Integer.parseInt(req.getParameter("id"));

String name= req.getParameter("name");

String sex= req.getParameter("sex");

String minzu= req.getParameter("minzu");

String zhuce= req.getParameter("zhuce");

String age= req.getParameter("age");

String zhengzhi= req.getParameter("zhengzhi");

String fuwu= req.getParameter("fuwu");

Course course= newCourse(id,name, sex, minzu,zhuce, age, zhengzhi,fuwu);

service.update(course);

req.setAttribute("message", "修改成功");

req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);

}/*** 查找

*@paramreq

*@paramresp

*@throwsServletException*/

private void search(HttpServletRequest req, HttpServletResponse resp) throwsIOException, ServletException{

req.setCharacterEncoding("utf-8");

String name= req.getParameter("name");

String sex= req.getParameter("sex");

String minzu= req.getParameter("minzu");

String zhuce= req.getParameter("zhuce");

String age= req.getParameter("age");

String zhengzhi= req.getParameter("zhengzhi");

String fuwu= req.getParameter("fuwu");

List courses =service.search(name, sex, minzu,zhuce, age, zhengzhi,fuwu);

req.setAttribute("courses", courses);

req.getRequestDispatcher("searchlist.jsp").forward(req,resp);

}

}packagecom.hjf.util;importjava.sql.Connection;importjava.sql.DriverManager;importjava.sql.PreparedStatement;importjava.sql.ResultSet;importjava.sql.SQLException;importjava.sql.Statement;/*** 数据库连接工具

*@authorHu

**/

public classDBUtil {public static String db_url = "jdbc:mysql://localhost:3306/user";public static String db_user = "root";public static String db_pass = "root";public staticConnection getConn () {

Connection conn= null;try{

Class.forName("com.mysql.jdbc.Driver");//加载驱动

conn =DriverManager.getConnection(db_url, db_user, db_pass);

}catch(Exception e) {

e.printStackTrace();

}returnconn;

}/*** 关闭连接

*@paramstate

*@paramconn*/

public static voidclose (Statement state, Connection conn) {if (state != null) {try{

state.close();

}catch(SQLException e) {

e.printStackTrace();

}

}if (conn != null) {try{

conn.close();

}catch(SQLException e) {

e.printStackTrace();

}

}

}public static voidclose (ResultSet rs, Statement state, Connection conn) {if (rs != null) {try{

rs.close();

}catch(SQLException e) {

e.printStackTrace();

}

}if (state != null) {try{

state.close();

}catch(SQLException e) {

e.printStackTrace();

}

}if (conn != null) {try{

conn.close();

}catch(SQLException e) {

e.printStackTrace();

}

}

}public static void main(String[] args) throwsSQLException {

Connection conn=getConn();

PreparedStatement pstmt= null;

ResultSet rs= null;

String sql="select * from course";

pstmt=conn.prepareStatement(sql);

rs=pstmt.executeQuery();if(rs.next()){

System.out.println("空");

}else{

System.out.println("不空");

}

}

}

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