三层架构完成增删改查篇章五
【摘要】 实现添加我们首先在Dao层也就是mapper层写出这个接口方法。package com.jgdabc.mapper;import com.jgdabc.pojo.Brand;import org.apache.ibatis.annotations.Delete;import org.apache.ibatis.annotations.Insert;import org.apache.iba...
实现添加
我们首先在Dao层也就是mapper层写出这个接口方法。
package com.jgdabc.mapper;
import com.jgdabc.pojo.Brand;
import org.apache.ibatis.annotations.Delete;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import java.util.List;
public interface BrandMapper {
@Select("select * from tb_brand")
List<Brand>selectAll();
@Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
void add(Brand brand);
@Select("select * from tb_brand where id = #{id}")
}
然后在service里面调用
public void add(Brand brand)
{
SqlSession sqlSession = factory.openSession();
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
mapper.add(brand);
sqlSession.commit();
sqlSession.close();
}
记住我们的工具类封装。
package com.jgdabc.util;
import org.apache.ibatis.io.Resources;
import org.apache.ibatis.session.SqlSessionFactory;
import org.apache.ibatis.session.SqlSessionFactoryBuilder;
import java.io.IOException;
import java.io.InputStream;
public class SqlSessionFactoryUtils {
private static SqlSessionFactory sqlSessionFactory;
static {
//静态代码块会随着类的加载而自动执行，且只执行一次
try {
String resource = "mybatis-config.xml";
InputStream inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException e) {
e.printStackTrace();
}
}
public static SqlSessionFactory getSqlSessionFactory(){
return sqlSessionFactory;
}
}
然后我们需要写出这个添加的jsp
<%--
Created by IntelliJ IDEA.
User: jgdabc
Date: 2022/5/11
Time: 17:33
To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>添加品牌</title>
</head>
<body>
<h3>添加品牌</h3>
<form action="/brand-demo/addServlet" method="post"enctype="application/x-www-form-urlencoded">
品牌名称：<input name="brandName"><br>
企业名称：<input name="companyName"><br>
排序：<input name="ordered"><br>
描述信息：<textarea rows="5" cols="20" name="description"></textarea><br>
状态：
<input type="radio" name="status" value="0">禁用
<input type="radio" name="status" value="1">启用<br>
<input type="submit" value="提交">
</form>
</body>
</html>
然后我们写这个Servlet。我们的Servlet从jsp前端获取到数据后我们再次回到查看全部数据的页面，这样可以查看到更新的数据。
package com.jgdabc.web;
import com.jgdabc.pojo.Brand;
import com.jgdabc.service.BrandService;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
private BrandService service = new BrandService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, IOException {
//接收表单提交的数据，封装为brand对象
// 处理乱码问题
request.setCharacterEncoding("utf-8");
String brandName = request.getParameter("brandName");
String companyName = request.getParameter("companyName");
String ordered = request.getParameter("ordered");
String description = request.getParameter("description");
String status = request.getParameter("status");
System.out.println("brandName"+brandName);
//封装为一个Brand对象
Brand brand = new Brand();
brand.setBrandName(brandName);
brand.setCompanyName(companyName);
brand.setOrdered(Integer.parseInt(ordered));
brand.setDescription(description);
brand.setStatus(Integer.parseInt(status));
service.add(brand);
// 转发到查询所有Servlet
//request.getRequestDispatcher("/selectAllServlet").forward(request, response);
response.sendRedirect("selectAllServlet");
System.out.println("request");
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("post");
doGet(request, response);
}
}
后面索性给brand.jsp加了个背景css。
属实比较丑陋
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<link href="css/login.css" rel="stylesheet">
</head>
<body>
<input type="button" value="新增" id="add" style="margin-left: -100px;margin-top: -300px;color: #50afeb"><br>
<hr>
<table border="1" cellspacing="0" width="80%">
<tr>
<th>序号</th>
<th>品牌名称</th>
<th>企业名称</th>
<th>排序</th>
<th>品牌介绍</th>
<th>状态</th>
<th>操作</th>
</tr>
<c:forEach items="${brands}" var="brand" varStatus="status">
<tr align="center">
<%--<td>${brand.id}</td>--%>
<td>${status.count}</td>
<td>${brand.brandName}</td>
<td>${brand.companyName}</td>
<td>${brand.ordered}</td>
<td>${brand.description}</td>
<c:if test="${brand.status == 1}">
<td>启用</td>
</c:if>
<c:if test="${brand.status != 1}">
<td>禁用</td>
</c:if>
<td><a href="/brand-demo01/selectByIdServlet?id=${brand.id}">修改</a>
<a href="/brand-demo01/selectDeleteServlet?id=${brand.id}">删除</a></td>
</tr>
</c:forEach>
</table>
<script>
document.getElementById("add").onclick = function (){
location.href = "/brand-demo01/addBrand.jsp";
}
</script>
</body>
</html>
具体的css还是我们之前用过的css布局
* {
margin: 0;
padding: 0;
}
html {
height: 100%;
width: 100%;
overflow: hidden;
margin: 0;
padding: 0;
background: url(../imgs/Desert.jpg) no-repeat 0px 0px;
background-repeat: no-repeat;
background-size: 100% 100%;
-moz-background-size: 100% 100%;
}
body {
display: flex;
align-items: center;
justify-content: center;
height: 100%;
}
#loginDiv {
width: 37%;
display: flex;
justify-content: center;
align-items: center;
height: 300px;
background-color: rgba(75, 81, 95, 0.3);
box-shadow: 7px 7px 17px rgba(52, 56, 66, 0.5);
border-radius: 5px;
}
#name_trip {
margin-left: 50px;
color: red;
}
p {
margin-top: 30px;
margin-left: 20px;
color: azure;
}
input {
margin-left: 15px;
border-radius: 5px;
border-style: hidden;
height: 30px;
width: 140px;
background-color: rgba(216, 191, 216, 0.5);
outline: none;
color: #f0edf3;
padding-left: 10px;
}
#username{
width: 200px;
}
#password{
width: 202px;
}
.button {
border-color: cornsilk;
background-color: rgba(100, 149, 237, .7);
color: aliceblue;
border-style: hidden;
border-radius: 5px;
width: 100px;
height: 31px;
font-size: 16px;
}
#subDiv {
text-align: center;
margin-top: 30px;
}
#loginMsg{
text-align: center;color: aliceblue;
}
然后我们启动一下。
我们进行添加的话，可以在这里添加成功。
我们对启用禁用这样进行数据回显。我在添加这个jsp页面这样做。当我点击禁用的话，就给值为0，当我点击启用给值为1。然后这样提交给Servlet进行处理，然后在brand.jsp里面根据这些数值做一些回显。
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