这次在广州实习了20天，收获还比较大。不过仍需要继续努力。这次总共布置了两个作业，我总结一下：
登记考勤信息，查看信息——主要就是往数据库增加数据，然后再从数据库中读取出来。
代码演示：
从数据库里面写入数据：
<%@page import="com.Seraphjin.Attence.model.attence"%>
<%@page import="com.Attence.BizImpl.AttenceBizImpl"%>
<%@page import="com.Attence.biz.AttenceBiz"%>
<%@page import="java.text.SimpleDateFormat"%>
<%@page import="java.text.DateFormat"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
request.setCharacterEncoding("utf-8");
String name = request.getParameter("name");
String dept = request.getParameter("dept");
String datetime = request.getParameter("datetime");
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-mm-dd");
Date date = sdf.parse(datetime);
int status =Integer.valueOf(request.getParameter("status")).intValue();
attence a = new attence();
a.setEmpName(name);
a.setDept(dept);
a.setDatetime(date);
a.setStatus(status);
AttenceBiz attenceBiz = new AttenceBizImpl();
boolean result = attenceBiz.addAttence(a);
if(result){
//response.sendRedirect("index.jsp");
out.print("成功");
}else{
//request.getRequestDispatcher("add.jsp").forward(request, response);
out.print("失败");
}
%>
这个是在jsp里面写的，不是在servlet里面写的。因为好理解，不过我现在已经习惯了写在servlet里面了。
首页jsp，往里面写入数据：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>考勤记录信息统计</title>
<link rel="stylesheet" type="text/css" href="CSS/index.css"/>
</head>
<body>
<div class="all">
<form id="writeDown" action="writeDown.jsp" method="post">
<table border="2px">
<tr>
<th class="zerot" colspan="2">考勤记录信息统计表</th>
</tr>
<tr>
<th class="onet">姓名</th>
<th class="twot">
<input type="text" class="name" name="name"/>
</th>
</tr>
<tr>
<th class="onet">所属部门</th>
<th class="twot">
<input type="text" class="dept" name="dept"/>
</th>
</tr>
<tr>
<th class="onet">考勤日期</th>
<th class="twot">
<input type="date" class="atime" name="datetime" value="2017-06-26"/>
</th>
</tr>
<tr>
<th class="onet">考勤状态</th>
<th class="twot">
<select name="status" id="status">
<option value="1">正常 </option>
<option value="2">迟到 </option>
<option value="3">早退 </option>
<option value="4">休假 </option>
<option value="5">外出 </option>
</select>
</th>
</tr>
</table>
<input id="btnSubmit" type="submit" name="btnSubmit" value="录入" />
<input id="btnReset" type="reset" name="btnReset" value="重置" />
<a href="Info.jsp">查看所有考勤信息</a>
</form>
</div>
</body>
</html>
获取所有数据的jsp：
<%@page import="com.Seraphjin.Attence.model.attence"%>
<%@page import="com.Attence.BizImpl.AttenceBizImpl"%>
<%@page import="com.Attence.biz.AttenceBiz"%>
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>
<%
AttenceBiz aBiz =new AttenceBizImpl();
List<attence> attences = aBiz.getAll();
request.setAttribute("attences", attences);
%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>考勤记录信息统计</title>
<link rel="stylesheet" type="text/css" href="CSS/index.css"/>
</head>
<body>
<div class="all1">
<table border="2px">
<tr>
<th class="zerot" colspan="4">考勤记录信息统计表</th>
</tr>
<tr>
<th class="">员工姓名</th>
<th class="">所属部门</th>
<th class="">考勤日期</th>
<th class="">考勤状态</th>
</tr>
<c:forEach var="attence" items="${attences}">
<tr>
<td>${attence.empName }</td>
<td>${attence.dept }</td>
<td>${attence.datetime }</td>
<td>${attence.status }</td>
</tr>
</c:forEach>
</table>
</div>
</body>
</html>
这个是把数据库里面的数据全部读取出来。
主要的方法实现：
package com.Attence.daoImpl;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import com.Attence.dao.AttenceDao;
import com.Seraphjin.Attence.model.attence;
public class AttenceDaoImpl extends BaseDao implements AttenceDao {
ArrayList<attence> attences = new ArrayList<attence>();
@Override
public List<attence> getAll() {
try {
openConnection();
String sql= "select * from attence";
ResultSet resultSet = executeQuery(sql, null);
while (resultSet.next()) {
attence a = new attence();
a.setId(resultSet.getInt("id"));
a.setEmpName(resultSet.getString("empName"));
a.setDept(resultSet.getString("dept"));
a.setDatetime(resultSet.getDate("datetime"));
a.setStatus(resultSet.getInt("status"));
attences.add(a);
}
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeResourse();
}
return attences;
}
@Override
public boolean addAttence(attence a) {
boolean result = false;
try {
openConnection();
String sql ="insert into attence value(?,?,?,?,?)";
result =excute(sql, new Object[]{
a.getId(),
a.getEmpName(),
a.getDept(),
a.getDatetime(),
a.getStatus()
});
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeResourse();
}
return result;
}
@Override
public boolean deleteAttence(int id) {
boolean result = false;
try {
openConnection();
String sql ="delete from attence where id = ?";
result = excute(sql, new Object[]{id});
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeResourse();
}
return result;
}
@Override
public boolean updateAttence(attence a) {
boolean result = false;
try {
openConnection();
String sql = "update attence set empName = ?, dept =?, datetime=?,status=? where id=?";
result = excute(sql, new Object[]{
a.getId()
});
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (SQLException e) {
e.printStackTrace();
}finally{
closeResourse();
}
return result;
}
}
连接数据库的基本操作：
package com.Attence.daoImpl;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class BaseDao {
//连接数据库
private String className = "com.mysql.jdbc.Driver";
private String dburl = "jdbc:mysql://localhost/ZJJexe";
private String user = "root";
private String password = "root";
private Connection connection;
private PreparedStatement statement;
private ResultSet resultSet;
public void openConnection() throws ClassNotFoundException, SQLException{
//加载驱动
Class.forName(className);
//创建连接
connection = DriverManager.getConnection(dburl,user,password);
}
//查询方法
public ResultSet executeQuery(String sql,Object[] params) throws SQLException{
statement =connection.prepareStatement(sql);
//追加参数
if(params !=null){
int i=1;
for (Object object : params) {
statement.setObject(i, object);
i++;
}
}
resultSet =statement.executeQuery();
return resultSet;
}
//更新
public boolean excute(String sql,Object[] params) throws SQLException {
statement =connection.prepareStatement(sql);
if(params !=null){
int i=1;
for (Object object : params) {
statement.setObject(i, object);
i++;
}
}
int updateCount = statement.executeUpdate();
if (updateCount != 0) {
return true;
}
else{
return false;
}
}
//释放资源
public void closeResourse(){
try {
if(resultSet != null){
resultSet.close();
}
if(statement != null){
statement.close();
}
if(connection != null){
connection.close();
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
其他就是方法的声明与调用。还有一个实体类，是员工信息：
package com.Seraphjin.Attence.model;
import java.util.Date;
public class attence {
private int id;
private String empName;
private String dept;
private Date datetime;
private int status;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getEmpName() {
return empName;
}
public void setEmpName(String empName) {
this.empName = empName;
}
public String getDept() {
return dept;
}
public void setDept(String dept) {
this.dept = dept;
}
public Date getDatetime() {
return datetime;
}
public void setDatetime(Date datetime) {
this.datetime = datetime;
}
public int getStatus() {
return status;
}
public void setStatus(int status) {
this.status = status;
}
}
OK~
近期我要学会用小乌龟，然后将自己的小项目部署到Github上~加油！
时间： 2024-08-08 16:50:05