河北省重大需求征集系统每日进度4

现给出部署截图及源码

 CourseDao,java

package com.hjf.dao;

import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;

import com.hjf.entity.Course;
import com.hjf.util.DBUtil;

/**
* 课程Dao
* Dao层操作数据
* @author Hu
*
*/
public class CourseDao {

/**
* 添加
* @param course
* @return
*/
public boolean add(Course course) {
String sql = "insert into course(name, teacher, classroom) values('" + course.getName() + "','" + course.getTeacher() + "','" + course.getClassroom() + "')";
Connection conn = DBUtil.getConn();
Statement state = null;
boolean f = false;
int a = 0;

try {
state = conn.createStatement();
a=state.executeUpdate(sql);
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(state, conn);
}

if (a > 0) {
f = true;
}
return f;
}

/**
* 删除
* 
* @param id
* @return
*/
public boolean delete (int id) {
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;
}
return f;
}

/**
* 修改
* @param name
* @param pass
*/
public boolean update(Course course) {
String sql = "update course set name='" + course.getName() + "', teacher='" + course.getTeacher() + "', classroom='" + course.getClassroom()
+ "' 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;
}
return f;
}

/**
* 验证课程名称是否唯一
* true --- 不唯一
* @param name
* @return
*/
public boolean name(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);
}
return flag;
}

/**
* 通过ID得到类
* @param id
* @return
*/
public Course getCourseById(int id) {
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 teacher = rs.getString("teacher");
String classroom = rs.getString("classroom");
course = new Course(id, name, teacher, classroom);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}

return course;
}

/**
* 通过name得到Course
* @param name
* @return
*/
public Course 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 teacher = rs.getString("teacher");
String classroom = rs.getString("classroom");
course = new Course(id, name, teacher, classroom);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}

return course;
}

/**
* 查找
* @param name
* @param teacher
* @param classroom
* @return
*/
public List<Course> search(String name, String teacher, String classroom) {
String sql = "select * from course where 1=1 ";
if(name!="") {
sql+=" name ='"+name+"'";
}
if(teacher!="") {
sql+=" and teacher='"+teacher+"'";
}
if(classroom!="") {
sql+=" and classroom='"+classroom+"'";
}
System.out.println(sql);

List<Course> 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 teacher2 = rs.getString("teacher");
String classroom2 = rs.getString("classroom");
bean = new Course(id, name2, teacher2, classroom2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}
System.out.println(sql);
return list;
}

/**
* 全部数据
* @param name
* @param teacher
* @param classroom
* @return
*/
public List<Course> list() {
String sql = "select * from course";
List<Course> 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 teacher2 = rs.getString("teacher");
String classroom2 = rs.getString("classroom");
bean = new Course(id, name2, teacher2, classroom2);
list.add(bean);
}
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBUtil.close(rs, state, conn);
}

return list;
}

}

Course.java

package com.hjf.entity;

public class Course {

private int id;
private String name;
private String teacher;
private String classroom;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getTeacher() {
return teacher;
}
public void setTeacher(String teacher) {
this.teacher = teacher;
}
public String getClassroom() {
return classroom;
}
public void setClassroom(String classroom) {
this.classroom = classroom;
}

public Course() {}

public Course(int id, String name, String teacher, String classroom) {
this.id = id;
this.name = name;
this.teacher = teacher;
this.classroom = classroom;
}

public Course(String name, String teacher, String classroom) {
this.name = name;
this.teacher = teacher;
this.classroom = classroom;
}
}

CourseServlet

package com.hjf.servlet;

import java.io.IOException;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.hjf.entity.Course;
import com.hjf.dao.CourseDao;

@WebServlet("/CourseServlet")
public class CourseServlet extends HttpServlet {

private static final long serialVersionUID = 1L;
public CourseServlet() {
super();
// TODO Auto-generated constructor stub
}
CourseDao dao = new CourseDao();

/**
* 方法选择
*/
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, 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
* @param req
* @param resp
* @throws IOException 
* @throws ServletException 
*/
private void add(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException {
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
String teacher = req.getParameter("teacher");
String classroom = req.getParameter("classroom");
Course course = new Course(name, teacher, classroom);
Course course1 = dao.getCourseByName(name);
//添加后消息显示
if(course1==null) {
if(dao.add(course)) {
req.setAttribute("message", "添加成功");
req.getRequestDispatcher("add.jsp").forward(req,resp);
}} else {
req.setAttribute("message", "重复失败");
req.getRequestDispatcher("add.jsp").forward(req,resp);
}


}

/**
* 全部
* @param req
* @param resp
* @throws ServletException 
*/
private void list(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
List<Course> courses = dao.list();
req.setAttribute("courses", courses);
req.getRequestDispatcher("list.jsp").forward(req,resp);
}

/**
* 通过ID得到Course
* @param req
* @param resp
* @throws ServletException 
*/
private void getCourseById(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
Course course = dao.getCourseById(id);
req.setAttribute("course", course);
req.getRequestDispatcher("detail2.jsp").forward(req,resp);
}

/**
* 通过名字查找
* 跳转至删除
* @param req
* @param resp
* @throws IOException
* @throws ServletException 
*/
private void getCourseByName(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
Course course = dao.getCourseByName(name);
if(course == null) {
req.setAttribute("message", "查无此人！");
req.getRequestDispatcher("del.jsp").forward(req,resp);
} else {
req.setAttribute("course", course);
req.getRequestDispatcher("detail.jsp").forward(req,resp);
}
}

/**
* 删除
* @param req
* @param resp
* @throws IOException
* @throws ServletException 
*/
private void del(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
dao.delete(id);
req.setAttribute("message", "删除成功！");
req.getRequestDispatcher("del.jsp").forward(req,resp);
}

/**
* 修改
* @param req
* @param resp
* @throws IOException
* @throws ServletException 
*/
private void update(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
int id = Integer.parseInt(req.getParameter("id"));
String name = req.getParameter("name");
String teacher = req.getParameter("teacher");
String classroom = req.getParameter("classroom");
Course course = new Course(id, name, teacher, classroom);

dao.update(course);
req.setAttribute("message", "修改成功");
req.getRequestDispatcher("CourseServlet?method=list").forward(req,resp);
}

/**
* 查找
* @param req
* @param resp
* @throws ServletException 
*/
private void search(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException{
req.setCharacterEncoding("utf-8");
String name = req.getParameter("name");
String teacher = req.getParameter("teacher");
String classroom = req.getParameter("classroom");
if(teacher==null&&name==null&&classroom==null) {
req.setAttribute("message", "查无此人！");
req.getRequestDispatcher("search.jsp").forward(req,resp);

}
List<Course> courses = dao.search(name, teacher, classroom);

if(courses == null) {
req.setAttribute("message", "查无此人！");
req.getRequestDispatcher("search.jsp").forward(req,resp);
} else {
req.setAttribute("courses", courses);
req.getRequestDispatcher("searchlist.jsp").forward(req,resp);
}
}

}

Dbutil.java

package com.hjf.util;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

/**
* 数据库连接工具
* @author Hu
*
*/
public class DBUtil {

public static String db_url = "jdbc:mysql://localhost:3306/test?useSSL=false";
public static String db_user = "root";
public static String db_pass = "root";

public static Connection 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();
}

return conn;
}

/**
* 关闭连接
* @param state
* @param conn
*/
public static void close (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 void close (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();
}
}
}

}

add,jsp

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<link rel="stylesheet" href="mainStyle.css" type="text/css" media="all" />
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
160px;
color: white;

}
</style>
</head>
<body>
<%
Object message = request.getAttribute("message");
if(message!=null && !"".equals(message)){

%>
<script type="text/javascript">
alert("<%=request.getAttribute("message")%>");
</script>
<%} %>
<div align="center">
<h1 style="color: red;">问卷录入</h1>
<a href="index.jsp">返回主页</a>
<form action="CourseServlet?method=add" method="post" onsubmit="return check()">
<div class="a">
问卷人<input type="text" id="name" name="name"/>
</div>
<div class="a">
问卷时间<input type="text" id="teacher" name="teacher" />
</div>
<div class="a">
问卷是否录入<input type="text" id="classroom" name="classroom" />
</div>
<div class="a">
<button type="submit" class="b">保&nbsp;&nbsp;&nbsp;存</button>
</div>
</form>
</div>
<script type="text/javascript">
function check() {
var name = document.getElementById("name");;
var teacher = document.getElementById("teacher");
var classroom = document.getElementById("classroom");

//非空
if(name.value == '') {
alert('问卷人为空');
name.focus();
return false;
}
if(teacher.value == '') {
alert('问卷时间为空');
teacher.focus();
return false;
}
if(classroom.value == '') {
alert('问卷是否录入为空');
classroom.focus();
return false;
}



}
</script>
</body>
</html>