JAVA-EE使用Servlet替代超链接用get请求实现动态展示页面信息并从服务器取值------计算机网络经典

柔光的暖阳◎ 2024-03-01 08:24 16阅读 0赞

>     <!DOCTYPE html>
>     <html>
>     	<head>
>     		<meta charset="utf-8">
>     		<title>欢迎页</title>
>     	</head>
>     	<body>
>     
>     		<a href="/OA/dept/list">查看部门列表</a>
>     	</body>
>     </html>
> 
>     <!DOCTYPE html>
>     <html>
>         <head>
>            <meta charset="utf-8">
>            <title>欢迎页</title>
>         </head>
>         <body>
>     
>            <a href="/OA/dept/list">查看部门列表</a>
>         </body>
>     </html>

>     package com.bjpowernode.oa.web.action;
>     
>     import com.bjpowernode.oa.utils.DBUtil;
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.io.PrintWriter;
>     import java.sql.*;
>     
>     public class DetailServlet extends HttpServlet
>     {
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             response.setContentType("text/html;charset=UTF-8");
>             PrintWriter out = response.getWriter();
>             String deptno = request.getParameter("deptno");
>             Connection connection = null;
>             ResultSet resultSet = null;
>             PreparedStatement statement = null;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept where deptno = " + deptno;
>                 statement = connection.prepareStatement(sql);
>                 resultSet = statement.executeQuery();
>                 if(resultSet.next())
>                 {
>                     String deptno1 = resultSet.getString("deptno");
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     out.println("<!DOCTYPE html>\n" +
>                             "<html>\n" +
>                             "\t<head>\n" +
>                             "\t\t<meta charset=\"utf-8\">\n" +
>                             "\t\t<title>部门详情</title>\n" +
>                             "\t</head>\n" +
>                             "\t<body>\n" +
>                             "\t\t<h1>部门详情</h1>\n" +
>                             "\t\t<hr>");
>                     out.println("部门编号:" + deptno + "<br>");
>                     out.println("部门名称:" + dname + "<br>");
>                     out.println("部门位置:" + loc + "<br>");
>                     out.println("\t\t\n" +
>                             "\t\t<input type=\"button\" value=\"后退\" onclick=\"window.history.back()\"/>\n" +
>                             "\t</body>\n" +
>                             "</html>");
>                 }
>             }
>             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 jakarta.servlet.ServletException;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.io.PrintWriter;
>     import java.sql.*;
>     
>     public class DetailServlet extends HttpServlet
>     {
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             response.setContentType("text/html;charset=UTF-8");
>             PrintWriter out = response.getWriter();
>             String deptno = request.getParameter("deptno");
>             Connection connection = null;
>             ResultSet resultSet = null;
>             PreparedStatement statement = null;
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept where deptno = " + deptno;
>                 statement = connection.prepareStatement(sql);
>                 resultSet = statement.executeQuery();
>                 if(resultSet.next())
>                 {
>                     String deptno1 = resultSet.getString("deptno");
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     out.println("<!DOCTYPE html>\n" +
>                             "<html>\n" +
>                             "\t<head>\n" +
>                             "\t\t<meta charset=\"utf-8\">\n" +
>                             "\t\t<title>部门详情</title>\n" +
>                             "\t</head>\n" +
>                             "\t<body>\n" +
>                             "\t\t<h1>部门详情</h1>\n" +
>                             "\t\t<hr>");
>                     out.println("部门编号:" + deptno + "<br>");
>                     out.println("部门名称:" + dname + "<br>");
>                     out.println("部门位置:" + loc + "<br>");
>                     out.println("\t\t\n" +
>                             "\t\t<input type=\"button\" value=\"后退\" οnclick=\"window.history.back()\"/>\n" +
>                             "\t</body>\n" +
>                             "</html>");
>                 }
>             }
>             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 jakarta.servlet.ServletException;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.io.PrintWriter;
>     import java.sql.Connection;
>     import java.sql.PreparedStatement;
>     import java.sql.ResultSet;
>     import java.sql.SQLException;
>     
>     public class DeptListServlet extends HttpServlet
>     {
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             String contextPath = request.getContextPath();
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             response.setContentType("text/html;charset=UTF-8");
>             PrintWriter writer = response.getWriter();
>             writer.println("<!DOCTYPE html>");
>             writer.println("<html>");
>             writer.println("	<head>");
>             writer.println("		<meta charset='utf-8'>");
>             writer.println("		<title>部门列表</title>");
>             writer.println("	</head>");
>             writer.println("	<body>");
>             writer.println("		<h1 align='center'>部门列表</h1>");
>             writer.println("		<hr>");
>             writer.println("		<table align='center' border='1px' width='50%'>");
>             writer.println("			<tr>");
>             writer.println("				<th>序号</th>");
>             writer.println("				<th>部门编号</th>");
>             writer.println("				<th>部门名称</th>");
>             writer.println("				<th>操作</th>");
>             writer.println("			</tr>");
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept";
>                 statement = connection.prepareStatement(sql);
>                 resultSet = statement.executeQuery();
>                 int i = 0;
>                 while(resultSet.next())
>                 {
>                     String deptno = resultSet.getString("deptno");
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     writer.println("			<tr>");
>                     writer.println("				<td>" + (++i) + "</td>");
>                     writer.println("				<td>" + (deptno) + "</td>");
>                     writer.println("				<td>" + (dname) + "</td>");
>                     writer.println("				<td>");
>                     writer.println("					<a href='javascript:void(0)' onclick='window.confirm('亲,确认删除该数据吗?')'>删除</a>");
>                     writer.println("					<a href='edit.html'>修改</a>");
>                     writer.println("					<a href='" + (contextPath) + "/dept/detail?deptno=" + deptno +"'>详情</a>");
>                     writer.println("				</td>");
>                     writer.println("			</tr>");
>                 }
>             }
>             catch (SQLException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             writer.println("		</table>");
>             writer.println("		<hr>");
>             writer.println("		<a href='add.html'>新增部门</a>");
>             writer.println("	</body>");
>             writer.println("</html>");
>         }
>     }
> 
>     package com.bjpowernode.oa.web.action;
>     
>     import com.bjpowernode.oa.utils.DBUtil;
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.io.PrintWriter;
>     import java.sql.Connection;
>     import java.sql.PreparedStatement;
>     import java.sql.ResultSet;
>     import java.sql.SQLException;
>     
>     public class DeptListServlet extends HttpServlet
>     {
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             String contextPath = request.getContextPath();
>             Connection connection = null;
>             PreparedStatement statement = null;
>             ResultSet resultSet = null;
>             response.setContentType("text/html;charset=UTF-8");
>             PrintWriter writer = response.getWriter();
>             writer.println("<!DOCTYPE html>");
>             writer.println("<html>");
>             writer.println("    <head>");
>             writer.println("       <meta charset='utf-8'>");
>             writer.println("       <title>部门列表</title>");
>             writer.println("    </head>");
>             writer.println("    <body>");
>             writer.println("       <h1 align='center'>部门列表</h1>");
>             writer.println("       <hr>");
>             writer.println("       <table align='center' border='1px' width='50%'>");
>             writer.println("          <tr>");
>             writer.println("             <th>序号</th>");
>             writer.println("             <th>部门编号</th>");
>             writer.println("             <th>部门名称</th>");
>             writer.println("             <th>操作</th>");
>             writer.println("          </tr>");
>             try
>             {
>                 connection = DBUtil.getConnection();
>                 String sql = "select * from dept";
>                 statement = connection.prepareStatement(sql);
>                 resultSet = statement.executeQuery();
>                 int i = 0;
>                 while(resultSet.next())
>                 {
>                     String deptno = resultSet.getString("deptno");
>                     String dname = resultSet.getString("dname");
>                     String loc = resultSet.getString("loc");
>                     writer.println("          <tr>");
>                     writer.println("             <td>" + (++i) + "</td>");
>                     writer.println("             <td>" + (deptno) + "</td>");
>                     writer.println("             <td>" + (dname) + "</td>");
>                     writer.println("             <td>");
>                     writer.println("                <a href='javascript:void(0)' οnclick='window.confirm('亲,确认删除该数据吗?')'>删除</a>");
>                     writer.println("                <a href='edit.html'>修改</a>");
>                     writer.println("                <a href='" + (contextPath) + "/dept/detail?deptno=" + deptno +"'>详情</a>");
>                     writer.println("             </td>");
>                     writer.println("          </tr>");
>                 }
>             }
>             catch (SQLException e)
>             {
>                 throw new RuntimeException(e);
>             }
>             finally
>             {
>                 DBUtil.close(connection,statement,resultSet);
>             }
>             writer.println("       </table>");
>             writer.println("       <hr>");
>             writer.println("       <a href='add.html'>新增部门</a>");
>             writer.println("    </body>");
>             writer.println("</html>");
>         }
>     }