目录
1、需求
2、步骤
1）创建模块 引入坐标
2）创建结构 实现三层架构
3）创建表 brand
4）创建实体类 Brand
5）创建MyBatis配置文件
6）创建映射文件
7）创建工具类 SqlSessionFactoryUtils
8）创建BrandService类
9）创建SelectAllServlet类
10）后端启动测试
________________
11）创建brand.html
12）加入JS：绑定事件、发送异步请求、处理响应数据
1、需求
前后端以JSON格式进行数据传递：此功能前端发送Ajax请求不需要携带参数，而后端响应数据需要JSON格式数据。
2、步骤
分析：
1）创建模块 引入坐标
创建模块或project
分析需要哪些依赖：
操作数据库用MySQL的驱动、MyBatis框架；Web应用用到Servlet、fastjson。
pom.xml：
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>brandCRUD</artifactId>
<version>1.0-SNAPSHOT</version>
<name>brandCRUD</name>
<packaging>war</packaging>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.target>1.8</maven.compiler.target>
<maven.compiler.source>1.8</maven.compiler.source>
<junit.version>5.8.1</junit.version>
</properties>
<dependencies>
<!--servlet-->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>4.0.1</version>
<scope>provided</scope>
</dependency>
<!--mysql-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.33</version>
</dependency>
<!--mybatis-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.5</version>
</dependency>
<!--fastjson-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.83</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-engine</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-war-plugin</artifactId>
<version>3.3.2</version>
</plugin>
</plugins>
</build>
</project>2）创建结构 实现三层架构
3）创建表 brand
-- 创建brand表
create table brand
(
-- id 主键
id int primary key auto_increment,
-- 品牌名称
brand_name varchar(20),
-- 简介
brand_intro varchar(200),
-- 排序字段
ordered int,
-- 状态：0：禁用 1：启用
status int
);
-- 添加数据
insert into brand (brand_name, brand_intro, ordered, status)
values ('洲际酒店', '知行天下', 100, 0),
('希尔顿', '带着目的去旅行，带着故事回家', 10, 1),
('哈斯利酒店', '罗马的静谧绿洲，悠久的历史与现代的奢华完美融合', 1000, 1);
SELECT * FROM brand;
4）创建实体类 Brand
在 pojo 中创建Brand类：
package com.example.brandcrud.pojo;
public class Brand {
// id 主键
private Integer id;
private String brandName; // 品牌名称
private String brandIntro; // 简介
private Integer ordered; // 排序
private Integer status; // 状态:0:禁用 1:启用
public Brand() {
}
public Brand(Integer id, String brandName, String brandIntro, Integer ordered, Integer status) {
this.id = id;
this.brandName = brandName;
this.brandIntro = brandIntro;
this.ordered = ordered;
this.status = status;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getBrandName() {
return brandName;
}
public void setBrandName(String brandName) {
this.brandName = brandName;
}
public String getBrandIntro() {
return brandIntro;
}
public void setBrandIntro(String brandIntro) {
this.brandIntro = brandIntro;
}
public Integer getOrdered() {
return ordered;
}
public void setOrdered(Integer ordered) {
this.ordered = ordered;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
@Override
public String toString() {
return "Brand{" +
"id=" + id +
", brandName='" + brandName + '\'' +
", brandIntro='" + brandIntro + '\'' +
", ordered=" + ordered +
", status=" + status +
'}';
}
}
5）创建MyBatis配置文件
resources中创建Mybatis-config.xml文件：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<!--起别名-->
<typeAliases>
<package name="com.example.brandcrud.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<!--改成自己的数据库名称、账户、密码-->
<property name="url" value="jdbc:mysql:///web?
useSSL=false&useServerPrepStmts=true"/>
<property name="username" value="root"/>
<property name="password" value="111111"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--扫描mapper-->
<package name="com.example.brandcrud.mapper"/>
</mappers>
</configuration>6）创建映射文件
resources中创建映射配置文件目录：com/example/brandcrud/mapper，
在这个文件夹中创建映射文件 BrandMapper.xml：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.brandcrud.mapper.BrandMapper">
</mapper>7）创建工具类 SqlSessionFactoryUtils
utils中创建SqlSessionFactoryUtils类：
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 = null;
try {
inputStream = Resources.getResourceAsStream(resource);
sqlSessionFactory = new SqlSessionFactoryBuilder().build(inputStream);
} catch (IOException ex) {
ex.printStackTrace();
}
}
public static SqlSessionFactory getSqlSessionFactory(){
return sqlSessionFactory;
}
}8）创建BrandMapper接口
在mapper文件夹中创建接口，在接口中定义 selectAll() 方法：
public interface BrandMapper {
/**
* 查询所有
*/
@Select("select * from brand")
List<Brand> selectAll();
}9）创建BrandService类
service中创建BrandService类，进行逻辑处理：
public class BrandService {
//获取SqlSessionFactory
SqlSessionFactory factory= SqlSessionFactoryUtils.getSqlSessionFactory();
/**
* 查询所有
*/
public List<Brand> selectAll(){
//调用mapper层的selectAll方法
//获取sqlSession对象
SqlSession sqlSession=factory.openSession();
//获取BrandMapper
BrandMapper mapper=sqlSession.getMapper(BrandMapper.class);
//调用方法
List<Brand> brands=mapper.selectAll();
sqlSession.close();
return brands;
}
}10）创建SelectAllServlet类
web中创建一个Servlet类：
@WebServlet("/selectAll")
public class SelectAllServlet extends HttpServlet {
private BrandService brandService=new BrandService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//调用service层的selectAll()方法 进行查询所有的逻辑处理
List<Brand> brands=brandService.selectAll();
//将集合转换为JSON数据：序列化
//如果是将JSON数据转换为Java对象，称为反序列化
String jsonString= JSON.toJSONString(brands);
//将JSON数据响应给浏览器 要设置响应数据的类型及字符集
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(jsonString);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doPost(request, response);
}
}后端启动测试
数据表中的品牌名、简介没有显示：
因为查询到的字段名和实体类对象的属性名没有一一对应，要在映射配置文件中使用resultMap定义映射关系。BrandMapper.xml修改为：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.example.brandcrud.mapper.BrandMapper">
<resultMap id="brandResultMap" type="brand">
<result column="brand_name" property="brandName"></result>
<result column="brand_intro" property="brandIntro"></result>
</resultMap>
</mapper>并且要在 BrandMapper 接口中的 selectAll() 上使用 @ResuleMap 注解指定使用该映射：
BrandMapper接口修改为：
public interface BrandMapper {
/**
* 查询所有
*/
@Select("select * from brand")
@ResultMap("brandResultMap")
List<Brand> selectAll();
}或者使用起别名的方式：
在BrandMapper.xml中的sql语句：
<select id="selectAll" resultType="com.example.brandcrud.pojo.Brand">
select id, brand_name as brandName, brand_intro as brandIntro, ordered,status from brand;
</select>
_________________
11）创建brand.html
webapp中创建（此处放到了project的webapp目录中，没有使用模块的webapp文件夹）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<a href="addBrand.html"><input type="button" value="新增"></a><br>
<hr>
<table id="brandTable" border="1" cellspacing="0" width="100%">
</table>
</body>
</html>12）加入JS：绑定事件、发送异步请求、处理响应数据
webapp中新建js文件夹，存入axios的js文件，文件名为axios-0.18.0.js：
/* axios v0.18.0 | (c) 2018 by Matt Zabriskie */
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//# sourceMappingURL=axios.min.map继续编写brand.html，加入JavaScript部分：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<a href="addBrand.html"><input type="button" value="新增"></a><br>
<hr>
<table id="brandTable" border="1" cellspacing="0" width="100%">
</table>
<!--引入 axios的js 文件-->
<script src="js/axios-0.18.0.js"></script>
<script>
window.onload=function(){ //给brand.html页面绑定加载完毕事件，页面加载完毕后被触发
//发送异步请求：发送ajax请求
axios({
method:"get",
url:"http://localhost:8080/understandTomcat/selectAll"
}).then(function (resp) { //处理响应数据：then中的回调函数中通过resp.data获取响应回来的数据
//
//获取数据
let brands=resp.data;
let tableData="<tr>\n"+
"<th>序号</th>\n"+
"<th>酒店名称</th>\n"+
"<th>简介</th>\n"+
"<th>排序</th>\n"+
"<th>状态</th>\n"+
"</tr>";
//遍历响应回来的数据brands，拿到每一个酒店品牌数据
for(let i=0; i<brands.length; i++) {
let brand = brands[i];
//从brand对象中获取数据并且拼接数据行，累加到tableData字符串变量中
tableData += "\n" +
"<tr align=\"center\">\n" +
"<td>" + (i + 1) + "</td>\n" +
"<td>" + brand.brandName + "</td>\n"+
"<td>" + brand.brandIntro + "</td>\n" +
"<td>" + brand.ordered + "</td>\n" +
"<td>" + brand.status + "</td>\n" +
"\n" +
"<td><a href=\"#\">修改</a> <a href=\"#\">删除</a></td>\n" +
"</tr>";
}
//将拼接好的字符串写到表格中
document.getElementById("brandTable").innerHTML=tableData;
})
}
</script>
</body>
</html>将数据与表格拼接的思路：
拼接字符串：将表格中的所有的 tr 拼接到一个字符串中，然后使用 document.getElementById("brandTable").innerHTML = 拼接好的字符串，就可以动态的展示数据。而表头行是固定的，先定义初始值是表头行数据的字符串。
启动访问：
