本次javaweb实习基于目前流行的企业级框架Spring 、Spring MVC、MyBatis（SSM）和前端技术JQuery的图书管理系统，主要功能包括：图书查询、图书管理、图书编辑、读者管理、图书的借阅与归还以及借还日志记录等。
1.技术简介
1.1 Mysql数据库：
Mysql是一种开放源代码的关系型数据库管理系统（RDBMS），使用最常用的数据库管理语言--结构化查询语言（SQL）进行数据库管理。
1.2 Javaweb：
Java Web，是用Java技术来解决相关web互联网领域的技术栈。web包括：web服务端和web客户端两部分。Java在客户端的应用有Java Applet，不过使用得很少，Java在服务器端的应用非常的丰富，比如Servlet，JSP、第三方框架等等。Java技术对Web领域的发展注入了强大的动力。
1.3 SSM
SSM（Spring+SpringMVC+MyBatis）框架集由Spring、MyBatis两个开源框架整合而成（SpringMVC是Spring中的部分内容）。常作为数据源较简单的web项目的框架。
2.Myweb项目部分功能实现
2.1 连接数据库：
try {
//1.加载驱动
Class.forName(driver);
//2.获得数据库连接
this.conn = DriverManager.getConnection(url, userno, password);
return conn;
} catch (Exception e) {
// 将异常信息写入到指定文件中（日志文件）
e.printStackTrace();
}
return null;
2.2 查询用户列表
代码：
//执行sql查询
String sql = "select * from t_user";
try {
//1、获得连接
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
//3、执行查询命令
this.rs = ps.executeQuery();
//4、取出执行结果
List<User> list = new ArrayList<User>();
while(rs.next()) {//如果有下一条
String name = rs.getString("name");
int userid = rs.getInt("user_id");
int age = rs.getInt("age");
String email = rs.getString("email");
String address = rs.getString("address");
String userno = rs.getString("userno");
String password = rs.getString("password");
User user = new User();
user.setAddress(address);
user.setAge(age);
user.setEmail(email);
user.setName(name);
user.setPassword(password);
user.setUserno(userno);
user.setUserid(userid);
list.add(user);
}
return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
2.3 登录
代码：
//执行sql查询
String sql = "select * from t_user where userno='"+userno+"' and password='"+password+"'";
try {
//1、获得连接
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
//3、执行查询命令
this.rs = ps.executeQuery();
//4、取出执行结果
while(rs.next()) {//如果有下一条
String name = rs.getString("name");
int userid = rs.getInt("user_id");
int age = rs.getInt("age");
String email = rs.getString("email");
String address = rs.getString("address");
User user = new User();
user.setAddress(address);
user.setAge(age);
user.setEmail(email);
user.setName(name);
user.setPassword(password);
user.setUserno(userno);
user.setUserid(userid);
return user;
}
} catch (Exception e) {
e.printStackTrace();
}
return null;
结果：
2.4 搜索用户列表
代码：
//执行sql查询
String sql = "select * from t_user where userno like '%" + userno1 + "%'";
try {
//1、获得连接
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
//3、执行查询命令
this.rs = ps.executeQuery();
//4、取出执行结果
List<User> list = new ArrayList<User>();
while(rs.next()) {//如果有下一条
String name = rs.getString("name");
int userid = rs.getInt("user_id");
int age = rs.getInt("age");
String email = rs.getString("email");
String address = rs.getString("address");
String userno = rs.getString("userno");
String password = rs.getString("password");
User user = new User();
user.setAddress(address);
user.setAge(age);
user.setEmail(email);
user.setName(name);
user.setPassword(password);
user.setUserno(userno);
user.setUserid(userid);
list.add(user);
}
return list;
} catch (Exception e) {
e.printStackTrace();
}
return null;
结果：
2.5 删除用户
代码：
String sql = "delete from t_user where user_id="+userid;
try {
//1、获得连接
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
//3、执行删除、修改、新增命令
//result:数据库受影响的行数
int result = ps.executeUpdate();//成功或失败，true后false
if(result>0) {
//成功
return true;
}else {
//失败
return false;
}
} catch (Exception e) {
e.printStackTrace();
}
return true;
结果：
2.6 根据id查询用户信息
代码：
String sql = "select * from t_user where user_id=" + userid;
try {
//1、获得连接(连接数据库)
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
//3、执行查询命令
this.rs = ps.executeQuery();
//4、取出执行结果
User user = null;
if(rs.next()) {//如果有下一条
String name = rs.getString("name");
int age = rs.getInt("age");
String email = rs.getString("email");
String address = rs.getString("address");
String userno = rs.getString("userno");
String password = rs.getString("password");
user = new User();
user.setAddress(address);
user.setAge(age);
user.setEmail(email);
user.setName(name);
user.setPassword(password);
user.setUserno(userno);
user.setUserid(Integer.parseUnsignedInt(userid));
}
return user;
} catch (Exception e) {
e.printStackTrace();
}
return null;
2.7 修改用户
代码：
String sql = "update t_user set userno=?,`password`=?,`name`=?,age=? where user_id=?";
try {
//1、获得连接
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
ps.setString(1, user.getUserno());//第一个问号
ps.setString(2, user.getPassword());
ps.setString(3, user.getName());
ps.setInt(4, user.getAge());
ps.setInt(5, user.getUserid());
//3、执行删除、修改、新增命令
//result:数据库受影响的行数
int result = ps.executeUpdate();//成功或失败，true后false
if(result>0) {
//成功
return true;
}else {
//失败
return false;
}
} catch (Exception e) {
e.printStackTrace();
}
return true;
结果：
2.8 新增用户
代码：
String sql = "insert into t_user(userno,`password`,`name`,age) values(?,?,?,?)";
try {
//1、获得连接
this.conn = this.getConn();
//2、获得执行命令对象
this.ps = conn.prepareStatement(sql);
ps.setString(1, user.getUserno());//第一个问号
ps.setString(2, user.getPassword());
ps.setString(3, user.getName());
ps.setInt(4, user.getAge());
// ps.setString(5, user.getEmail());
// ps.setString(6, user.getAddress());
//3、执行删除、修改、新增命令
//result:数据库受影响的行数
int result = ps.executeUpdate();//成功或失败，true后false
if(result>0) {
//成功
return true;
}else {
//失败
return false;
}
} catch (Exception e) {
e.printStackTrace();
}
return true;
结果：
2.9 LoginServlet
/**
* 用户登录
*/
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public LoginServlet() {
// TODO Auto-generated constructor stub
}
/**
* 接收get请求
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
/**
* 接收post请求
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
String userno = request.getParameter("userno");//取得账号
String password = request.getParameter("password");//取得密码
UserService userService = new UserService();
//调用业务层方法
User user = userService.login(userno, password);
if(user != null) {
//查询用户
List<User> list = userService.findUserList();
//查询总页数
int count = userService.findUserCount();//数据总数
Page page = new Page();
int total = 0;//总页数
if(count % page.getPageSize() > 0) {
total = count/page.getPageSize() + 1;
}else {
total = count/page.getPageSize();
}
//跳转到首页
//request中的数据针对的是某一次请求，请求结束数据失效
//request.setAttribute("user", user);
//session对象针对的是同一个浏览器的不同窗口直接共享数据
request.getSession().setAttribute("user", user);
request.setAttribute("list", list);
request.setAttribute("page", new Page().getPage());//当前第几页
request.setAttribute("total", total);
request.getRequestDispatcher("index.jsp").forward(request, response);
}else {
//登陆失败
request.getRequestDispatcher("login.html").forward(request, response);
}
}
2.10 UserServlet
/**
* 用户控制器
*/
public class UserServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
public UserServlet() {
super();
// TODO Auto-generated constructor stub
}
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
request.setCharacterEncoding("utf8");
String action = request.getParameter("action");//取得操作行为
String userid = request.getParameter("userid");//取得用户id
UserService userService = new UserService();
if(action != null && action.equals("delete")) {//删除操作
boolean result = userService.deleteUser(userid);
if(result) {
//删除成功
List<User> list = userService.findUserList();
//跳转到首页
//request.setAttribute("user", user);
request.setAttribute("list", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}else if(action != null && action.equals("toUpdate")){//跳转到修改界面
User user = userService.findUserById(userid);
request.setAttribute("user", user);
request.getRequestDispatcher("update.jsp").forward(request, response);
}else if(action != null && action.equals("update")) {
String userno = request.getParameter("userno");//取得账号
String password = request.getParameter("password");//取得密码
String age = request.getParameter("age")!=null?request.getParameter("age"):"0";//取得年龄
String name = request.getParameter("name");//取得姓名
User user = new User();
user.setUserid(Integer.parseInt(userid));
user.setAge(Integer.parseInt(age));
user.setName(name);
user.setUserno(userno);
user.setPassword(password);
boolean result = userService.updateUser(user);
if(result) {
//修改成功
//获取用户列表
List<User> list = userService.findUserList();
//跳转到首页
//request.setAttribute("user", user);
request.setAttribute("list", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}else if(action != null && action.equals("toAdd")){//跳转到新增界面
request.getRequestDispatcher("add.jsp").forward(request, response);
}else if(action != null && action.equals("add")) {//新增用户
String userno = request.getParameter("userno");//取得账号
String password = request.getParameter("password");//取得密码
String age = request.getParameter("age")!=null?request.getParameter("age"):"0";//取得年龄
String name = request.getParameter("name");//取得姓名
User user = new User();
user.setAge(Integer.parseInt(age));
user.setName(name);
user.setUserno(userno);
user.setPassword(password);
boolean result = userService.addUser(user);
if(result) {
//添加成功
//获取用户列表
List<User> list = userService.findUserList();
//跳转到首页
//request.setAttribute("user", user);
request.setAttribute("list", list);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}else if(action != null && action.equals("findPage")) {//分页查询
String page = request.getParameter("page") == null ? "1" : request.getParameter("page");//当前第几页
Page p = new Page();
p.setPage(Integer.parseInt(page));
List<User> list = userService.findUserListByPage(p);
//查询总页数
int count = userService.findUserCount();//数据总数
Page page2 = new Page();
int total = 0;//总页数
if(count % page2.getPageSize() > 0) {
total = count/page2.getPageSize() + 1;
}else {
total = count/page2.getPageSize();
}
//跳转到首页
request.setAttribute("list", list);
request.setAttribute("page", page);//记录当前页数，便于页面取值
request.setAttribute("total", total);
request.getRequestDispatcher("index.jsp").forward(request, response);
}else {//搜索
String userno = request.getParameter("userno");//取得账号
List<User> list = userService.findUserListByUserNo(userno);
//跳转到首页
//request.setAttribute("user", user);
request.setAttribute("list", list);
request.setAttribute("userno", userno);
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}
}
}
3.Myssm项目部分功能实现
3.1 查询用户列表和分页
代码：
UserInfoController.java：
/**
* 查询用户列表
* @throws Exception
*/
@RequestMapping("/findUserInfoList")
public void findUserInfoList(HttpServletRequest request,HttpServletResponse response) throws Exception{
String pageIndex = request.getParameter("pageIndex");//页面索引，0：第一页，1：第二页，依次类推
String pageSize = request.getParameter("pageSize");//每页多少条
String username = request.getParameter("key");//搜索功能：获取搜索参数值（用户姓名）
HashMap mapParam = new HashMap();
mapParam.put("pageSize", Integer.parseInt(pageSize));
mapParam.put("rowNum", Integer.parseInt(pageSize)*Integer.parseInt(pageIndex));
mapParam.put("username", username);
List<UserInfo> userInfoList = userInfoService.findUserInfoList(mapParam);
int count = userInfoService.findUserInfoCount();//查询数据总数
HashMap map = new HashMap();
map.put("total", count);
map.put("data", userInfoList);
String json = JSON.encode(map);
System.out.println(json);
//向前端返回数据
response.getWriter().write(json);
}
Mapper.xml：
<!-- 查询用户列表 -->
<select id = "findUserInfoList" resultMap="BaseResultMap" parameterType = "map" >
select
<include refid = "Base_Column_List" />
from user_info
<if test = "username != null" >
where username like "%"#{username,jdbcType = VARCHAR}"%"
</if>
limit #{rowNum},#{pageSize}
<!-- limit ${(pageNo - 1) * pageSize},${pageSize} -->
</select>
<!-- 查询用户数据总数 -->
<select id = "findUserInfoCount" resultType = "int" parameterType = "map" >
select count(*) as count from user_info
</select>
结果：
3.2 用户登录
代码：
UserInfoController.java：
/**
* 用户登录
* @throws Exception
*/
@RequestMapping("/userLogin")
public void userLogin(HttpServletRequest request,HttpServletResponse response) throws Exception{
String username = request.getParameter("username");
String password = request.getParameter("pwd");
UserInfo userInfo = new UserInfo();
userInfo.setUserno(username);
userInfo.setPassword(password);
UserInfo u = userInfoService.userLogin(userInfo);
if(u != null) {
response.getWriter().write("success");
}else {
response.getWriter().write("fail");
}
}
Mapper.xml：
<!-- 用户登录 -->
<select id = "userLogin" resultMap = "BaseResultMap" parameterType = "com.fxy.book.model.UserInfo" >
select * from user_info where userNo = #{userno,jdbcType = VARCHAR} and password = #{password,jdbcType = VARCHAR}
</select>
结果：
3.3 新增用户
代码：
UserInfoController.java：
/**
* 新增用户
* @throws Exception
*/
@RequestMapping("/addUserInfo")
public void addUserInfo(HttpServletRequest request,HttpServletResponse response) throws Exception{
String userid = request.getParameter("userid");
if(userid==null||userid.equals("")){
userid = "0";
}
String username = request.getParameter("username");
String password = request.getParameter("password");
String userno = request.getParameter("userno");
String sex = request.getParameter("sex");
String address = request.getParameter("address");
String phone = request.getParameter("phone");
String role = request.getParameter("role");
UserInfo userInfo = new UserInfo();
userInfo.setPassword(password);
if(userid!=null && !userid.equals("")) {
userInfo.setUserid(Long.parseLong(userid));
}
userInfo.setUserno(userno);
userInfo.setAddress(address);
userInfo.setPhone(phone);
userInfo.setRole(Integer.parseInt(role));;
userInfo.setSex(sex);
userInfo.setUsername(username);
int result = userInfoService.addUserInfo(userInfo);
if(result > 0) {
response.getWriter().write("success");
}else {
response.getWriter().write("fail");
}
}
Mapper.xml：
<insert id = "insertSelective" parameterType = "com.fxy.book.model.UserInfo" >
insert into user_info
<trim prefix = "(" suffix = ")" suffixOverrides = "," >
<if test = "userid != null" >
userId,
</if>
<if test = "userno != null" >
userNo,
</if>
<if test = "password != null" >
password,
</if>
<if test = "username != null" >
userName,
</if>
<if test = "sex != null" >
sex,
</if>
<if test = "address != null" >
address,
</if>
<if test = "phone != null" >
phone,
</if>
<if test = "role != null" >
role,
</if>
<if test = "createtime != null" >
createTime,
</if>
</trim>
</insert>
结果：