JAVA-EE模板方法模式实现动态修改部门信息------计算机网络经典

青旅半醒 2024-02-22 03:07 33阅读 0赞

>     package com.bjpowernode.oa.web.action;
>     
>     import com.bjpowernode.oa.utils.DBUtil;
>     import com.bjpowernode.oa.web.Pojo.Dept;
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.annotation.WebServlet;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.sql.Connection;
>     import java.sql.PreparedStatement;
>     import java.sql.ResultSet;
>     import java.sql.SQLException;
>     import java.util.ArrayList;
>     import java.util.List;
>     
>     @WebServlet(urlPatterns = {"/dept/list","/dept/detail","/dept/delete","/dept/save","/dept/edit"})
>     public class DeptServlet extends HttpServlet
>     {
>         @Override
>         protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             String servletPath = request.getServletPath();
>             if("/dept/list".equals(servletPath))
>             {
>                 doList(request,response);
>             }
>             else if("/dept/detail".equals(servletPath))
>             {
>                 doDetail(request,response);
>             }
>             else if("/dept/delete".equals(servletPath))
>             {
>                 doDel(request,response);
>             }
>             else if("/dept/save".equals(servletPath))
>             {
>                 doSave(request,response);
>             }
>             else if("/dept/edit".equals(servletPath))
>             {
>                 doModify(request,response);
>             }
>         }
>     
>         private void doModify(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             request.setCharacterEncoding("UTF-8");
>             Integer deptno = Integer.parseInt(request.getParameter("deptno"));
>             String dname = request.getParameter("dname");
>             String loc = request.getParameter("loc");
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String contextPath = request.getContextPath();
>             int count = 0;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 connection.setAutoCommit(false);
>                 String sql = "update dept set dname = ?,loc = ? where deptno = ?";
>                 statement = connection.prepareStatement(sql);
>                 statement.setString(1,dname);
>                 statement.setString(2,loc);
>                 statement.setInt(3,deptno);
>                 count = statement.executeUpdate();
>                 connection.commit();
>             }
>             catch (SQLException e)
>             {
>                 if (connection != null)
>                 {
>                     try
>                     {
>                         connection.rollback();
>                     }
>                     catch (SQLException ex)
>                     {
>                         throw new RuntimeException(ex);
>                     }
>                 }
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             if(count == 1)
>             {
>                 response.sendRedirect(contextPath + "/dept/list");
>             }
>             else
>             {
>                 response.sendRedirect("/Error.html");
>             }
>         }
>     
>         private void doSave(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             request.setCharacterEncoding("UTF-8");
>             Integer deptno = Integer.parseInt(request.getParameter("deptno"));
>             String dname = request.getParameter("dname");
>             String loc = request.getParameter("loc");
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String contextPath = request.getContextPath();
>             int count = 0;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 connection.setAutoCommit(false);
>                 String sql = "insert into dept(deptno,dname,loc) values(?,?,?)";
>                 statement = connection.prepareStatement(sql);
>                 statement.setInt(1,deptno);
>                 statement.setString(2,dname);
>                 statement.setString(3,loc);
>                 count = statement.executeUpdate();
>                 connection.commit();
>     
>             }
>             catch (SQLException e)
>             {
>                 if (connection != null)
>                 {
>                     try
>                     {
>                         connection.rollback();
>                     }
>                     catch (SQLException ex)
>                     {
>                         throw new RuntimeException(ex);
>                     }
>                 }
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             if(count == 1)
>             {
>                 response.sendRedirect(contextPath + "/dept/list");
>             }
>             else
>             {
>                 response.sendRedirect("/Error.html");
>             }
>         }
>     
>         private void doDel(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String deptno = request.getParameter("deptno");
>             int count = 0;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 connection.setAutoCommit(false);
>                 String sql = "delete from dept where deptno = ?";
>                 statement = connection.prepareStatement(sql);
>                 statement.setString(1,deptno);
>                 count = statement.executeUpdate();
>                 connection.commit();
>             }
>             catch (SQLException e)
>             {
>                 if (connection != null)
>                 {
>                     try
>                     {
>                         connection.rollback();
>                     }
>                     catch (SQLException ex)
>                     {
>                         throw new RuntimeException(ex);
>                     }
>                 }
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             if(count == 1)
>             {
>                 response.sendRedirect(request.getContextPath() + "/dept/list");
>             }
>             else
>             {
>                 response.sendRedirect(request.getContextPath() + "/Error.html");
>             }
>         }
>     
>         private void doDetail(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String deptno = request.getParameter("deptno");
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept where deptno = ?";
>                 statement = connection.prepareStatement(sql);
>                 statement.setString(1,deptno);
>                 resultSet = statement.executeQuery();
>                 if(resultSet.next())
>                 {
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     Dept dept = new Dept(deptno,dname,loc);
>                     request.setAttribute("dept",dept);
>                 }
>             }
>             catch (SQLException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             String flag = request.getParameter("f");
>             if("d".equals(flag))
>             {
>                 request.getRequestDispatcher("/detail.jsp").forward(request,response);
>             }
>             if("m".equals(flag))
>             {
>                 request.getRequestDispatcher("/edit.jsp").forward(request,response);
>             }
>         }
>     
>         private void doList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             //连接数据库,查询所有部门信息
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             List<Dept> list = new ArrayList<Dept>();
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept";
>                 statement = connection.prepareStatement(sql);
>                 resultSet = statement.executeQuery();
>                 while(resultSet.next())
>                 {
>                     String deptno = resultSet.getString("deptno");
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     Dept dept = new Dept(deptno,dname,loc);
>                     list.add(dept);
>                 }
>                 request.setAttribute("dept",list);
>                 request.getRequestDispatcher("/list.jsp").forward(request,response);
>             }
>             catch (SQLException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>         }
>     }
> 
>     package com.bjpowernode.oa.web.action;
>     
>     import com.bjpowernode.oa.utils.DBUtil;
>     import com.bjpowernode.oa.web.Pojo.Dept;
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.annotation.WebServlet;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.sql.Connection;
>     import java.sql.PreparedStatement;
>     import java.sql.ResultSet;
>     import java.sql.SQLException;
>     import java.util.ArrayList;
>     import java.util.List;
>     
>     @WebServlet(urlPatterns = {"/dept/list","/dept/detail","/dept/delete","/dept/save","/dept/edit"})
>     public class DeptServlet extends HttpServlet
>     {
>         @Override
>         protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             String servletPath = request.getServletPath();
>             if("/dept/list".equals(servletPath))
>             {
>                 doList(request,response);
>             }
>             else if("/dept/detail".equals(servletPath))
>             {
>                 doDetail(request,response);
>             }
>             else if("/dept/delete".equals(servletPath))
>             {
>                 doDel(request,response);
>             }
>             else if("/dept/save".equals(servletPath))
>             {
>                 doSave(request,response);
>             }
>             else if("/dept/edit".equals(servletPath))
>             {
>                 doModify(request,response);
>             }
>         }
>     
>         private void doModify(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             request.setCharacterEncoding("UTF-8");
>             Integer deptno = Integer.parseInt(request.getParameter("deptno"));
>             String dname = request.getParameter("dname");
>             String loc = request.getParameter("loc");
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String contextPath = request.getContextPath();
>             int count = 0;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 connection.setAutoCommit(false);
>                 String sql = "update dept set dname = ?,loc = ? where deptno = ?";
>                 statement = connection.prepareStatement(sql);
>                 statement.setString(1,dname);
>                 statement.setString(2,loc);
>                 statement.setInt(3,deptno);
>                 count = statement.executeUpdate();
>                 connection.commit();
>             }
>             catch (SQLException e)
>             {
>                 if (connection != null)
>                 {
>                     try
>                     {
>                         connection.rollback();
>                     }
>                     catch (SQLException ex)
>                     {
>                         throw new RuntimeException(ex);
>                     }
>                 }
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             if(count == 1)
>             {
>                 response.sendRedirect(contextPath + "/dept/list");
>             }
>             else
>             {
>                 response.sendRedirect("/Error.html");
>             }
>         }
>     
>         private void doSave(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             request.setCharacterEncoding("UTF-8");
>             Integer deptno = Integer.parseInt(request.getParameter("deptno"));
>             String dname = request.getParameter("dname");
>             String loc = request.getParameter("loc");
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String contextPath = request.getContextPath();
>             int count = 0;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 connection.setAutoCommit(false);
>                 String sql = "insert into dept(deptno,dname,loc) values(?,?,?)";
>                 statement = connection.prepareStatement(sql);
>                 statement.setInt(1,deptno);
>                 statement.setString(2,dname);
>                 statement.setString(3,loc);
>                 count = statement.executeUpdate();
>                 connection.commit();
>     
>             }
>             catch (SQLException e)
>             {
>                 if (connection != null)
>                 {
>                     try
>                     {
>                         connection.rollback();
>                     }
>                     catch (SQLException ex)
>                     {
>                         throw new RuntimeException(ex);
>                     }
>                 }
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             if(count == 1)
>             {
>                 response.sendRedirect(contextPath + "/dept/list");
>             }
>             else
>             {
>                 response.sendRedirect("/Error.html");
>             }
>         }
>     
>         private void doDel(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String deptno = request.getParameter("deptno");
>             int count = 0;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 connection.setAutoCommit(false);
>                 String sql = "delete from dept where deptno = ?";
>                 statement = connection.prepareStatement(sql);
>                 statement.setString(1,deptno);
>                 count = statement.executeUpdate();
>                 connection.commit();
>             }
>             catch (SQLException e)
>             {
>                 if (connection != null)
>                 {
>                     try
>                     {
>                         connection.rollback();
>                     }
>                     catch (SQLException ex)
>                     {
>                         throw new RuntimeException(ex);
>                     }
>                 }
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             if(count == 1)
>             {
>                 response.sendRedirect(request.getContextPath() + "/dept/list");
>             }
>             else
>             {
>                 response.sendRedirect(request.getContextPath() + "/Error.html");
>             }
>         }
>     
>         private void doDetail(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             String deptno = request.getParameter("deptno");
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept where deptno = ?";
>                 statement = connection.prepareStatement(sql);
>                 statement.setString(1,deptno);
>                 resultSet = statement.executeQuery();
>                 if(resultSet.next())
>                 {
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     Dept dept = new Dept(deptno,dname,loc);
>                     request.setAttribute("dept",dept);
>                 }
>             }
>             catch (SQLException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             String flag = request.getParameter("f");
>             if("d".equals(flag))
>             {
>                 request.getRequestDispatcher("/detail.jsp").forward(request,response);
>             }
>             if("m".equals(flag))
>             {
>                 request.getRequestDispatcher("/edit.jsp").forward(request,response);
>             }
>         }
>     
>         private void doList(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             //连接数据库,查询所有部门信息
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             List<Dept> list = new ArrayList<Dept>();
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept";
>                 statement = connection.prepareStatement(sql);
>                 resultSet = statement.executeQuery();
>                 while(resultSet.next())
>                 {
>                     String deptno = resultSet.getString("deptno");
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     Dept dept = new Dept(deptno,dname,loc);
>                     list.add(dept);
>                 }
>                 request.setAttribute("dept",list);
>                 request.getRequestDispatcher("/list.jsp").forward(request,response);
>             }
>             catch (SQLException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>         }
>     }