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jdbc+jsp实现简单员工管理系统

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简单的页面分析 。

在上一个文章简单的数据库连接测试,已经测试和数据库做简单的交互,也就是dao层的实现,接下来要说的却是action的简单实现,在ssh中有struts作为表示层和server的交换,而这里我不是说的是关于struts这里只是简单的运用jsp的代码书写来实现数据的传输,这也是最繁琐的步骤,但是这却让我们对底层的调用有一个简单的了解,这里是直接调用封装好的数据,交换和使用,首先要书写的是action的使用,用的最多的就是getparameter表单的提交了,这里在网络上提交一个表单吗,然后通过getparameter进行获取,然后通过enployeedao中的方法进行增删改查,就能够进行基本的逻辑操作了.

代码实现 。

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<% @page import = "dao.employeedao" %>
<% @page import = "java.text.simpledateformat" %>
<% @page import = "entity.employee" %>
<%@ page 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>
 
   <%
     //1、接收表单提交的参数
     string action = request.getparameter( "action" );
 
     //3.调用employeedao中addemployee(employee employee)完成员工添加
     employeedao employeedao = new employeedao();
     if (action.equals( "0" ) || action.equals( "1" )) {
       //添加 更新
       string empno = request.getparameter( "empno" );
       string ename = request.getparameter( "ename" );
       string sal = request.getparameter( "sal" );
       string hiredate = request.getparameter( "hiredate" );
 
       //2.将数据封装至employee对象中
       employee employee = new employee();
       employee.setempno(integer.parseint(empno));
       employee.setename(ename);
       employee.setsal( double .parsedouble(sal));
       simpledateformat sdf = new simpledateformat( "yyyy-mm-dd" );
       employee.sethiredate(sdf.parse(hiredate));
 
       if (action.equals( "0" )) {
         //添加
         employeedao.addemployee(employee);
       } else {
         //更新
         employeedao.updateemployee(employee);
       }
 
     } else if (action.equals( "2" )) {
       //删除
       string empno = request.getparameter( "empno" );
       employeedao.deleteemployee(empno);
     } else if (action.equals( "3" )) {
       //批量删除
       system.out.println( "action=" +action);
 
       string[] chks=request.getparametervalues( "chks" );
       for (string chk:chks){
         system.out.println( "chk=" +chk);
       }
 
 
     }
 
     //4.画面跳转至employeelist.jsp 重定向
     response.sendredirect( "employeelist.jsp" );
   %>
</body>
</html>

然后我们进行简单的页面设计,运用了表格的形式进行设计,代码如下 。

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<% @page import = "java.util.list" %>
<% @page import = "entity.employee" %>
<% @page import = "dao.employeedao" %>
<% @page 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>
<script>
   function checkall() {
 
     //1.获取chkall的选中状态checked
     var chkall = document.getelementbyid( "chkall" );
     //alert(chkall.checked);
 
     //2、获取其他所有的checkbox
     var chks = document.getelementsbyname( "chks" );
     for (var i = 0 ; i < chks.length; i++) {
       //3、将chkall的选中状态于其他checkbox的选中状态同步
       chks[i].checked = chkall.checked;
     }
   }
 
   function ondelete(empno){
     var result=confirm( "delete employee?" );
     if (result){
       window.location.href= "employeemanageaction.jsp?action=2&empno=" rel= "external nofollow" +empno;
     }
   }
 
   //function ondeletebatch(){
     //判断是否有选中的checkbox
 
     //有选中的场合
     //提示是否删除确认的信息
     //确认删除
     //提交表单
     //var action=document.getelementbyid("action");
     //action.value="3";
 
   // document.frmlist.action="employeemanageaction.jsp"
     // document.frmlist.submit();
     //取消删除
     //不用处理
 
 
 
     //无选中的场合
     //提示选中记录的信息
 
   //}
 
 
</script>
</head>
<body>
   <h3>employee list page</h3>
 
   <form name= "frmsearch" action= "xxxxaction.jsp" method= "post" >
     ename:<input type= "text" /> <input type= "submit" name= "btnsubmit"
       value= "submit" />
   </form>
   <p>
   <hr />
 
   <a href= "employeemanage.jsp?action=0" rel= "external nofollow" >add employee</a> 
   <a href= "javascript:void(0)" rel= "external nofollow" rel= "external nofollow" onclick= "ondeletebatch();" >delete
     employee batch</a>
   <p>
     <%
       employeedao emplyeedao = new employeedao();
       list<employee> employees = emplyeedao.getemployees();
     %>
 
     <%
       if (employees != null && employees.size() > 0 ) {
     %>
 
   <form name= "frmlist" action= "" method= "post" >
     <input type= "hidden" name= "action" id= "action" value= "" />
     <table width= "600px" border= "1px" >
 
       <tr bgcolor= "#009966" >
         <td><input type= "checkbox" id= "chkall" onclick= "checkall()" /></td>
         <td>empno</td>
         <td>ename</td>
         <td>sal</td>
         <td>hiredate</td>
         <td>action</td>
       </tr>
 
       <%
         employee employee = null ;
           for ( int i = 0 ; i < employees.size(); i++) {
             employee = employees.get(i);
       %>
       <tr>
         <td><input type= "checkbox" id= "chk<%=i + 1%>" name= "chks"
           value= "<%=employee.getempno()%>" /></td>
         <td><%=employee.getempno()%></td>
         <td><%=employee.getename()%></td>
         <td><%=employee.getsal()%></td>
         <td><%=employee.gethiredate()%></td>
         <td><a
           href= "employeemanage.jsp?action=1&empno=<%=employee.getempno()%>" rel= "external nofollow" >update</a>
           <a href= "javascript:void(0)" rel= "external nofollow" rel= "external nofollow"
           onclick= "ondelete(<%=employee.getempno()%>);" >delete</a></td>
       </tr>
       <%
         }
       %>
     </table>
 
   </form>
 
   <%
     }
   %>
</body>
</html>

接下来要说的是更新操作 。

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<% @page import = "entity.employee" %>
<% @page import = "dao.employeedao" %>
<%@ page 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>
<script>
   function checkform() {
 
     var empno = document.getelementbyid( "empno" );
     if (empno && empno.value == "" ) {
       empno.focus();
       alert( "please input empno" );
       return ;
     }
 
     var ename = document.getelementbyid( "ename" );
     if (ename && ename.value == "" ) {
       ename.focus();
       alert( "please input ename" );
       return ;
     }
 
     var sal = document.getelementbyid( "sal" );
     if (sal && sal.value == "" ) {
       sal.focus();
       alert( "please input sal" );
       return ;
     }
 
     var hiredate = document.getelementbyid( "hiredate" );
     if (hiredate && hiredate.value == "" ) {
       hiredate.focus();
       alert( "please input hiredate" );
       return ;
     }
 
     var frm = document.getelementbyid( "frm" );
     frm.submit();
 
   }
</script>
 
 
</head>
<body>
 
   <%
     string action=request.getparameter( "action" );
 
     employee employee= null ;
     if (action.equals( "1" )){
       //更新操作
       string empno = request.getparameter( "empno" );
 
       employeedao employeedao = new employeedao();
       employee=employeedao.getemployeebyempno(empno);
     }
 
   %>
 
   <h3>employee <%=action.equals( "1" )? "update" : "regist" %> page</h3>
 
   <form id= "frm" action= "employeemanageaction.jsp" method= "post"
     onsubmit= "return checkform();" >
     <input type= "hidden" name= "action" value= "<%=action%>" />
     <table>
       <tr>
         <td>empno</td>
         <td><input type= "text" id= "empno" name= "empno" <%=action.equals( "1" )? "readonly" : "" %> value= "<%=employee==null?" ":employee.getempno()%>" /></td>
       </tr>
 
       <tr>
         <td>ename</td>
         <td><input type= "text" id= "ename" name= "ename" value= "<%=employee==null?" ":employee.getename()%>" /></td>
       </tr>
 
       <tr>
         <td>sal</td>
         <td><input type= "text" id= "sal" name= "sal" value= "<%=employee==null?" ":employee.getsal()%>" /></td>
       </tr>
 
       <tr>
         <td>hiredate</td>
         <td><input type= "text" id= "hiredate" name= "hiredate" value= "<%=employee==null?" ":employee.gethiredate()%>" /></td>
       </tr>
 
       <tr>
         <td><input type= "button" name= "btnsubmit" value= "submit"
           onclick= "checkform();" /></td>
         <td><input type= "reset" name= "btnreset" value= "reset" /></td>
       </tr>
     </table>
   </form>
</body>
</html>

在这个过程中刚好用到了简单的js对数据进行非空和数据类型判断,这就是我们需要学会的逻辑,业务层,然后进行其他操作,当然我注释的是还没完成的多个删除和模糊搜索,这个下一个博客再去完善.

总结 。

在学习这个过程中,学会了更多关于数据调用的知识,而不是像hibernate那样在配置文件配置,然后直接调用就可以了,再用jsp中也发现jsp嵌入代码,更加笨重,这也是我学习的另一个方面吧.

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持我.

原文链接:https://blog.csdn.net/lxh5431/article/details/52489972 。

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