JAVAWEBSMBMS 期末大作业
Posted 乘凉者 栽树人
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SMBMS javaweb期末大作业
1、项目部署准备
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创建一个新的maven，选中maven的webapp，然后创建
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新建项目结构
-
连接数据库并且创建实体类
-
配置pom.xml文件信息
<dependencies> <dependency> <groupId>javax.servlet</groupId> <artifactId>servlet-api</artifactId> <version>2.5</version> </dependency> <dependency> <groupId>javax.servlet.jsp</groupId> <artifactId>javax.servlet.jsp-api</artifactId> <version>2.3.3</version> </dependency> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>5.1.47</version> </dependency> <dependency> <groupId>javax.servlet.jsp.jstl</groupId> <artifactId>jstl-api</artifactId> <version>1.2</version> </dependency> <dependency> <groupId>taglibs</groupId> <artifactId>standard</artifactId> <version>1.1.2</version> </dependency> </dependencies> -
配置数据库链接驱动db.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/smbms?useUnicode=true&characterEncoding=utf-8 user=root password=root -
写一个BaseDao来获取数据库的连接信息
public class BaseDao private static String driver; private static String url; private static String user; private static String password; //静态代码块，类加载的时候就初始化了 static //通过类加载读取对应资源 Properties properties = new Properties(); InputStream is = BaseDao.class.getClassLoader().getResourceAsStream("db.properties"); try properties.load(is); catch (IOException e) e.printStackTrace(); driver=properties.getProperty("driver"); url=properties.getProperty("url"); user=properties.getProperty("user"); password=properties.getProperty("password"); //获取数据库的连接 public static Connection getConnection() Connection connection=null; try Class.forName(driver); connection= DriverManager.getConnection(url,user,password); catch (ClassNotFoundException e) e.printStackTrace(); catch (SQLException e) e.printStackTrace(); return connection; //编写查询的公共类 public static ResultSet execute(Connection connection, String sql, Object[] params, ResultSet resultSet, PreparedStatement preparedStatement) throws SQLException //预编译sql，在后面直接执行即可 preparedStatement = connection.prepareStatement(sql); for (int i = 0; i < params.length; i++) preparedStatement.setObject(i + 1, params[i]);//占位符是从1开始的 resultSet = preparedStatement.executeQuery(sql); return resultSet; public static int execute(Connection connection, String sql, Object[] params, PreparedStatement preparedStatement) throws SQLException //增删改查公共方法 preparedStatement = connection.prepareStatement(sql); for (int i = 0; i < params.length; i++) preparedStatement.setObject(i + 1, params[i]);//占位符是从1开始的 int updateRows=preparedStatement.executeUpdate(); return updateRows; //释放资源 public static boolean closeResources(Connection connection, ResultSet resultSet, PreparedStatement preparedStatement) boolean flag=true; //回收资源 if(resultSet!=null) try resultSet.close(); catch (SQLException e) e.printStackTrace(); flag=false; if(connection!=null) try connection.close(); catch (SQLException e) e.printStackTrace(); flag=false; if(preparedStatement!=null) try preparedStatement.close(); catch (SQLException e) e.printStackTrace(); flag=false; return flag; -
过滤器characterEndingFile
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException request.setCharacterEncoding("utf-8"); response.setCharacterEncoding("utf-8"); chain.doFilter(request,response); -
配置web.xml文件
<!-- 字符编码过滤器--> <filter> <filter-name>characterEndingFile</filter-name> <filter-class>com.kong.filter.characterEndingFile</filter-class> </filter> <filter-mapping> <filter-name>characterEndingFile</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
2、登录实现
1、控制层user
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UserDao
public interface UserDao //得到需要的用户 public User getLoginUser(Connection connection,String userCode) throws SQLException; -
UserDaoImpl
ublic class UserDaoImpl implements UserDao public User getLoginUser(Connection connection, String userCode) throws SQLException PreparedStatement pstm=null; ResultSet rs=null; User user=null; if(connection!=null) String sql = "select * from smbms_user where userCode=?"; Object[] params = userCode; rs = BaseDao.execute(connection, pstm, rs, sql, params); if (rs.next()) user = new User(); user.setId(rs.getInt("id")); user.setUserCode(rs.getString("userCode")); user.setUserName(rs.getString("userName")); user.setUserPassword(rs.getString("userPassword")); user.setGender(rs.getInt("gender")); user.setBirthday(rs.getDate("birthday")); user.setPhone(rs.getString("phone")); user.setAddress(rs.getString("address")); user.setUserRole(rs.getInt("userRole")); user.setCreatedBy(rs.getInt("createdBy")); user.setCreationDate(rs.getTimestamp("creationDate")); user.setModifyBy(rs.getInt("modifyBy")); user.setModifyDate(rs.getTimestamp("modifyDate")); BaseDao.closeResources(null, pstm, rs); return user;
2、服务层service
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UserService
public interface UserService public User login(String userCode,String password); -
UserServiceImpl
public class UserServiceImpl implements UserService //业务层会调用dao层，引入dao层操作 private UserDao userDao; public UserServiceImpl() userDao = new UserDaoImpl(); public User login(String userCode, String userPassword) Connection connection = null; User user = null; try connection = BaseDao.getConnection(); //通过业务层调用对应的具体数据库操作 user = userDao.getLoginUser(connection,userCode); catch (SQLException e) e.printStackTrace(); finally BaseDao.closeResources(connection,null,null); return user; @Test public void test() UserServiceImpl userService=new UserServiceImpl(); User admin = userService.login("admin", "123456"); System.out.println(admin.getUserPassword());
3、servlet层
- Loginservlet
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
System.out.println("你好");
//获取用户和密码
String userCode=req.getParameter("userCode");
String userPassword=req.getParameter("userPassword");
//和数据库中的密码进行对比，调用业务层
UserService userService=new UserServiceImpl();
User user=userService.login(userCode,userPassword);//把登录的人查出来
if(user!=null)
//查有此人，可以登录
req.getSession().setAttribute(Constants.USER_SESSION,user);
resp.sendRedirect("jsp/frame.jsp");
else
req.setAttribute("error","用户名或者密码不正确");
//失败转发回登录页面，并且获取error消息
req.getRequestDispatcher("login.jsp").forward(req,resp);
4、写一个工具类放在util方便修改
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Constants
public class Constants public final static String USER_SESSION="userSession";
5、配置web.xml
<servlet>
<servlet-name>LoginServlet</servlet-name>
<servlet-class>com.kong.servlet.user.Loginservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginServlet</servlet-name>
<url-pattern>/login.do</url-pattern>
重定向（redirect）和请求转发（getRequestDispatcher）的区别
- 重定向：两次请求两次响应
请求转发：只有一次
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重定向：需要给出响应的URL，也就是包含的项目名
请求转发：只需要给出转发的Servlet路径
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重定向：显示后一个请求的地址，属于客户端行为，重新发送了请求，整个过程不在同一个请求中，因此会跳转
请求转发：地址不会发生变化，属于服务端的行为，整个过程是同一次请求
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重定向：到了Servlet，再到其他项目
请求转发：只能是本项目其他Servlet
3、注销及权限过滤
注销功能：删除session，返回登录页面
- LoginOut
public class LoginOut extends HttpServlet
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException
//删除session
req.getSession().removeAttribute(Constants.USER_SESSION);
resp.sendRedirect(req.getContextPath()+"/login.jsp");
- 登录拦截实现
根据判断session是否为空，来做拦截的判断
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException
HttpServletRequest request1 = (HttpServletRequest) request;
HttpServletResponse response1 = (HttpServletResponse) response;
//过滤器，获取session用户
User user=(User) request1.getSession().getAttribute(Constants.USER_SESSION);
if(user==null)//已经移除或者注销，或者未登录
response1.sendRedirect("/error.jsp");
else
chain.doFilter(request,response);
注意每一写一步都要配置web.xml
<!-- 登录拦截-->
<filter>
<filter-name>loginFilter</filter-name>
<filter-class>com.kong.filter.loginFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>loginFilter</filter-name>
<url-pattern>/jsp/*</url-pattern>
</filter-mapping>
<!-- 注销-->
<servlet>
<servlet-name>LoginOut</servlet-name>
<servlet-class>com.kong.servlet.user.LoginOut</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>LoginOut</servlet-name>
<url-pattern>/jsp/logout.do</url-pattern>
</servlet-mapping>
4、密码的修改
导入前端静态资源
pwdmodify.js(重要部分代码)
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