这篇文章主要为大家详细介绍了jdbc+jsp实现简单员工管理系统,文中示例代码介绍的非常详细,具有一定的参考价值,感兴趣的小伙伴们可以参考一下
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<%@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<%@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" >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" /></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"
>delete</a></td>
</tr>
<%
}
%>
</table>
</form>
<%
}
%>
</body>
</html> 接下来要说的是更新操作<%@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"
>
<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"
/></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CodeAE代码之家。
原文链接:https://blog.csdn.net/lxh5431/article/details/52489972
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