水果系统项目分析pro09-fruit1.4-thymelea
基本架构
-
IndexServlet为继承的Servlet容器类
-
ViewBaseServlet为复制的thymelea源代码用来渲染页面
-
index.html为前端界面
index.html
<html xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<link rel="stylesheet" href="css/index.css">
</head>
<body>
<div id="div_container">
<div id="div_fruit_list">
<p class="center f30">欢迎使用水果库存后台管理系统</p>
<table id="tbl_fruit">
<tr>
<th class="w20">名称</th>
<th class="w20">单价</th>
<th class="w20">库存</th>
<th>操作</th>
</tr>
<tr th:if="${#lists.isEmpty(session.fruitList)}">
<td colspan="4">对不起，库存为空！</td>
</tr>
<tr th:unless="${#lists.isEmpty(session.fruitList)}" th:each="fruit : ${session.fruitList}">
<td th:text="${fruit.fname}">苹果</td>
<td th:text="${fruit.price}">5</td>
<td th:text="${fruit.fcount}">20</td>
<td><img src="imgs/del.jpg" class="delImg"/></td>
</tr>
</table>
</div>
</div>
</body>
</html>
上面是一个前端界面用来显示从session会话域里面获取过来的东西.并且使用thymelea渲染出来.
index.css
*{
color: threeddarkshadow;
}
body{
margin:0;
padding:0;
background-color:#808080;
}
div{
position:relative;
float:left;
}
#div_container{
width:80%;
height:100%;
border:0px solid blue;
margin-left:10%;
float:left;
background-color: honeydew;
border-radius:8px;
}
#div_fruit_list{
width:100%;
border:0px solid red;
}
#tbl_fruit{
width:60%;
line-height:28px;
margin-top:16px;
margin-left:20%;
}
#tbl_fruit , #tbl_fruit tr , #tbl_fruit th , #tbl_fruit td{
border:1px solid gray;
border-collapse:collapse;
text-align:center;
font-size:16px;
font-family:"黑体";
font-weight:lighter;
}
.w20{
width:20%;
}
.delImg{
width:24px;
height:24px;
}
.btn{
border:1px solid lightgray;
width:80px;
height:24px;
}
.center{
text-align:center;
}
.f30{
font-size: 30px;
}
web.xml配置文件
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
version="4.0">
<!-- 配置上下文参数 -->
<context-param>
<param-name>view-prefix</param-name>
<param-value>/</param-value>
</context-param>
<context-param>
<param-name>view-suffix</param-name>
<param-value>.html</param-value>
</context-param>
</web-app>
这个web.xml中的配置上下文参数就是说通过这个配置文件的逻辑视图和物理视图让Servlet通过thymelea技术来渲染前端界面.
IndexServlet.java
package com.atguigu.fruit.servlets;
import com.atguigu.fruit.dao.FruitDAO;
import com.atguigu.fruit.dao.impl.FruitDAOImpl;
import com.atguigu.fruit.pojo.Fruit;
import com.atguigu.myssm.myspringmvc.ViewBaseServlet;
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 javax.servlet.http.HttpSession;
import java.io.IOException;
import java.util.List;
//Servlet从3.0版本开始支持注解方式的注册
@WebServlet("/index")
public class IndexServlet extends ViewBaseServlet {
@Override
public void doGet(HttpServletRequest request , HttpServletResponse response)throws IOException, ServletException {
FruitDAO fruitDAO = new FruitDAOImpl();
List<Fruit> fruitList = fruitDAO.getFruitList();
//保存到session作用域
HttpSession session = request.getSession() ;
session.setAttribute("fruitList",fruitList);
//此处的视图名称是 index
//那么thymeleaf会将这个 逻辑视图名称 对应到 物理视图 名称上去
//逻辑视图名称 ： index
//物理视图名称 ： view-prefix + 逻辑视图名称 + view-suffix
//所以真实的视图名称是： / index .html
super.processTemplate("index",request,response);
}
}
- 先使用fruitDAO获取了数据库中的全部数据
- 然后将fruitlist保存到session作用域.
- 然后使用父类的processTemplate方法来渲染index.html界面.
下面是几个附加的类
Fruit.java
package com.atguigu.fruit.pojo;
public class Fruit {
private Integer fid ;
private String fname ;
private Integer price ;
private Integer fcount ;
private String remark ;
public Fruit(){}
public Fruit(Integer fid, String fname, Integer price, Integer fcount, String remark) {
this.fid = fid;
this.fname = fname;
this.price = price;
this.fcount = fcount;
this.remark = remark;
}
public Integer getFid() {
return fid;
}
public void setFid(Integer fid) {
this.fid = fid;
}
public String getFname() {
return fname;
}
public void setFname(String fname) {
this.fname = fname;
}
public Integer getPrice() {
return price;
}
public void setPrice(Integer price) {
this.price = price;
}
public Integer getFcount() {
return fcount;
}
public void setFcount(Integer fcount) {
this.fcount = fcount;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
@Override
public String toString() {
return fid + "\t\t" + fname + "\t\t" + price +"\t\t" + fcount +"\t\t" + remark ;
}
}
FruitDAO.java
package com.atguigu.fruit.dao;
import com.atguigu.fruit.pojo.Fruit;
import java.util.List;
public interface FruitDAO {
//获取所有的库存列表信息
List<Fruit> getFruitList();
}
这里面是存放的Servlet里面的抽象方法
FruitDAOImpl.java
package com.atguigu.fruit.dao.impl;
import com.atguigu.fruit.dao.FruitDAO;
import com.atguigu.fruit.pojo.Fruit;
import com.atguigu.myssm.basedao.BaseDAO;
import java.util.List;
public class FruitDAOImpl extends BaseDAO<Fruit> implements FruitDAO {
@Override
public List<Fruit> getFruitList() {
return super.executeQuery("select * from t_fruit");
}
}