2009’河北省高教网络技能大赛一网站建设部分

实现了录入功能

package dao;
//对数据库的操作
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import entity.Course;
import util.DBUtil;

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

/**
* 添加增
* @param course
* @return
*/
public boolean add(Course course) {
String sql = "insert into course(title, workname, man) values('" + course.getTitle() + "','" + course.getWorkname() + "','" + course.getMan() + "')";
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 {
DBUtil.close(state, conn);
}

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

public boolean title(String title) {
boolean flag = false;
String sql = "select name from course where name = '" + title + "'";
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;
}
}

package entity;

public class Course {

private String title;
private String workname;
private String man;

public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public String getWorkname() {
return workname;
}
public void setWorkname(String workname) {
this.workname = workname;
}
public String getMan() {
return man;
}
public void setMan(String man) {
this.man = man;
}

public Course() {}
//*构造方法

public Course(String title, String workname, String man) {
this.title = title;
this.workname = workname;
this.man = man;
}
}

package service;

import java.util.List;

import dao.CourseDao;
import entity.Course;

/**
* CourseService
* 服务层
* @author Zheng
*
*/
@SuppressWarnings("unused")
public class CourseService {

CourseDao cDao = new CourseDao();

/**
* 添加
* @param course
* @return
*/
public boolean add(Course course) {
boolean f = false;
if(!cDao.title(course.getTitle())) {
cDao.add(course);
f = true;
}
return f;
}}

package 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 entity.Course;
import service.CourseService;

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

private static final long serialVersionUID = 1L;

CourseService service = new CourseService();

/**
* 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);
}
}

/**
* 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 title = req.getParameter("title");
String workname = req.getParameter("workname");
String man = req.getParameter("man");
Course course = new Course(title,workname,man);

//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);
}
}}

package util;
//数据库连接
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 Zheng
*
*/
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();
}
}
}

}

录入界面

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<style>
.a{
margin-top: 20px;
}
.b{
font-size: 20px;
width: 160px;
color: white;
background-color: greenyellow;
}
</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;">公文录入</h1>
<a href="index.jsp">返回主页</a>
<form action="CourseServlet?method=add" method="post" onsubmit="return check()">
<div class="a">
公文标题<input type="text" id="title" name="title"/>
</div>
<div class="a">
部门名称<input type="text" id="workname" name="workname" />
</div>
<div class="a">
起草人<input type="text" id="man" name="man" />
</div>
<div class="a">
<button type="submit" class="b">保   存</button>
</div>
</form>
</div>
<script type="text/javascript">
function check() {
var title = document.getElementById("title");;
var workname = document.getElementById("workname");
var man = document.getElementById("man");

//非空
if(title.value == '') {
alert('公文为空');
name.focus();
return false;
}
if(workname.value == '') {
alert('部门为空');
teacher.focus();
return false;
}
if(man.value == '') {
alert('起草人');
classroom.focus();
return false;
}

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

做出了一个注册登陆界面（其中有参考网上部分）

<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<jsp:useBean id="db" class="Bean.DBBean" scope="page" />
<%
request.setCharacterEncoding("UTF-8");
String username=(String)request.getParameter("username");
String password=(String)request.getParameter("password");//取出login.jsp的值

//下面是数据库操作
String sql="select * from login where username="+"'"+username+"'";//定义一个查询语句
ResultSet rs=db.executeQuery(sql);//运行上面的语句
if(rs.next())
{
/* if(password.equals(rs.getString(2)))
{

} */
if(password.equals(rs.getObject("password"))){
response.sendRedirect("loginsuccess.jsp");
}
else{
out.print("<script language='javaScript'> alert('密码错误');</script>");
response.setHeader("refresh", "0;url=login.jsp");
}
}
else
{
out.print("<script language='javaScript'> alert('账号错误——else');</script>");
response.setHeader("refresh", "0;url=login.jsp");
}

%>
</body>
</html>

<%@ page import="java.sql.*" language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>登陆成功</h1>
</body>
</html>

2009’河北省高教网络技能大赛一网站建设部分

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