目录
1.后台代码比较简单，所以不过多进行叙述（想要了解，请看我之前发的文章）
JavaWeb + Ajax + HTML +Vue 添加数据数据与查询数据（Vue小节 案例）_我的猴子的博客-CSDN博客
（这篇文章是加上了Vue，用来简化原生js获取数据的麻烦问题）
1.文件结构
2.BrandMaper接口
package com.itheima.mapper;
import com.itheima.pojo.Brand;
import org.apache.ibatis.annotations.Insert;
import org.apache.ibatis.annotations.ResultMap;
import org.apache.ibatis.annotations.Select;
import org.apache.ibatis.annotations.Update;
import java.util.List;
public interface BrandMapper {
/**
* 查询所有
* @return
*/
@Select("select * from tb_brand")
@ResultMap("brandResultMap")
List<Brand> selectAll();
@Insert("insert into tb_brand values(null,#{brandName},#{companyName},#{ordered},#{description},#{status})")
void add(Brand brand);
/**
* 根据id查询
* @param id
* @return
*/
@Select("select * from tb_brand where id = #{id}")
@ResultMap("brandResultMap")
Brand selectById(int id);
/**
* 修改
* @param brand
*/
@Update("update tb_brand set brand_name = #{brandName},company_name = #{companyName},ordered = #{ordered},description = #{description},status = #{status} where id = #{id}")
void update(Brand brand);
}
3.Brand实体类
package com.itheima.pojo;
/**
* 品牌实体类
*/
public class Brand {
// id 主键
private Integer id;
// 品牌名称
private String brandName;
// 企业名称
private String companyName;
// 排序字段
private Integer ordered;
// 描述信息
private String description;
// 状态：0：禁用 1：启用
private Integer status;
public Brand() {
}
public Brand(Integer id, String brandName, String companyName, String description) {
this.id = id;
this.brandName = brandName;
this.companyName = companyName;
this.description = description;
}
public Brand(Integer id, String brandName, String companyName, Integer ordered, String description, Integer status) {
this.id = id;
this.brandName = brandName;
this.companyName = companyName;
this.ordered = ordered;
this.description = description;
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 getCompanyName() {
return companyName;
}
public void setCompanyName(String companyName) {
this.companyName = companyName;
}
public Integer getOrdered() {
return ordered;
}
public void setOrdered(Integer ordered) {
this.ordered = ordered;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Integer getStatus() {
return status;
}
public void setStatus(Integer status) {
this.status = status;
}
@Override
public String toString() {
return "Brand{" +
"id=" + id +
", brandName='" + brandName + '\'' +
", companyName='" + companyName + '\'' +
", ordered=" + ordered +
", description='" + description + '\'' +
", status=" + status +
'}';
}
}
4.BrandService
package com.itheima.service;
import com.itheima.mapper.BrandMapper;
import com.itheima.pojo.Brand;
import com.itheima.util.SqlSessionFactoryUtils;
import org.apache.ibatis.session.SqlSession;
import org.apache.ibatis.session.SqlSessionFactory;
import java.util.List;
public class BrandService {
SqlSessionFactory factory = SqlSessionFactoryUtils.getSqlSessionFactory();
/**
* 查询所有
* @return
*/
public List<Brand> selectAll(){
//调用BrandMapper.selectAll()
//2. 获取SqlSession
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
List<Brand> brands = mapper.selectAll();
sqlSession.close();
return brands;
}
/**
* 添加
* @param brand
*/
public void add(Brand brand){
//2. 获取SqlSession
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
mapper.add(brand);
//提交事务
sqlSession.commit();
//释放资源
sqlSession.close();
}
/**
* 根据id查询
* @return
*/
public Brand selectById(int id){
//调用BrandMapper.selectAll()
//2. 获取SqlSession
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
Brand brand = mapper.selectById(id);
sqlSession.close();
return brand;
}
/**
* 修改
* @param brand
*/
public void update(Brand brand){
//2. 获取SqlSession
SqlSession sqlSession = factory.openSession();
//3. 获取BrandMapper
BrandMapper mapper = sqlSession.getMapper(BrandMapper.class);
//4. 调用方法
mapper.update(brand);
//提交事务
sqlSession.commit();
//释放资源
sqlSession.close();
}
}
5.SqlSessionFactoryUtils工具类
package com.itheima.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;
}
}
6.AddServlet添加Servlet类
package com.itheima.web;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.BufferedReader;
import java.io.IOException;
import java.util.List;
@WebServlet("/addServlet")
public class AddServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.获取请求行数据
BufferedReader reader = request.getReader();
//2.读取请求行数据
String s = reader.readLine();
//3.把json格式转为java
Brand brand = JSONObject.parseObject(s,Brand.class);
//4.调用service方法,并且传入数据
BrandService service = new BrandService();
service.add(brand);
//5.相应成功后的数据
response.getWriter().write("success");
System.out.println(brand);
System.out.println(s);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
7.SelectAllServlet查询Serrvlet类
package com.itheima.web;
import com.alibaba.fastjson.JSON;
import com.itheima.pojo.Brand;
import com.itheima.service.BrandService;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.annotation.*;
import java.io.IOException;
import java.util.List;
@WebServlet("/selectAllServlet")
public class SelectAllServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//1.创建service对象，
BrandService service = new BrandService();
//2.进行调用方法查询
List<Brand> brands = service.selectAll();
//3.将查询后的集合转为json的数据
String s = JSON.toJSONString(brands);
//4.相应到对应的页面上(由于此集合中的数据有中文（即从数据库查询出的数据包含有中文，所以要进行转码操作）)
response.setContentType("text/json;charset=utf-8");
response.getWriter().write(s);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
this.doGet(request, response);
}
}
8.BrandMapper.xml映射文件
<?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.itheima.mapper.BrandMapper">
<resultMap id="brandResultMap" type="brand">
<result column="brand_name" property="brandName"></result>
<result column="company_name" property="companyName"></result>
</resultMap>
</mapper>9.mybatis-config.xml
<?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.itheima.pojo"/>
</typeAliases>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql:///db1?useSSL=false&useServerPrepStmts=true"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</dataSource>
</environment>
</environments>
<mappers>
<!--扫描mapper-->
<package name="com.itheima.mapper"/>
</mappers>
</configuration>10.js包下axios-0.18.0.js
/* axios v0.18.0 | (c) 2018 by Matt Zabriskie */
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//# sourceMappingURL=axios.min.map11.AddBrand.html（简单方法，比较low）
<!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 id="brand" action="" method="post">
品牌名称：<input id="brandName" name="brandName"><br>
企业名称：<input id="companyName" name="companyName"><br>
排序：<input id="ordered" name="ordered"><br>
描述信息：<textarea rows="5" cols="20" id="description" name="description"></textarea><br>
状态：
<input type="radio" name="status" value="0">禁用
<input type="radio" checked="checked" name="status" value="1">启用<br>
<input type="button" id="btn" value="提交" onclick="req()">
</form>
<script src="js/axios-0.18.0.js"></script>
<script>
function req(){
//1.设置好json
var jsonData = {
brandName:"",
companyName:"",
ordered:"",
description:"",
status:"",
};
//2.获取数据
let brandName = document.getElementById("brandName").value;
jsonData.brandName = brandName;
let companyName = document.getElementById("companyName").value;
jsonData.companyName = companyName;
let ordered = document.getElementById("ordered").value;
jsonData.ordered = ordered;
let description = document.getElementById("description").value;
jsonData.description = description;
let status = document.getElementsByName("status");
for (let i = 0; i < status.length; i++) {
if(status[i].checked){
jsonData.status = status[i].value ;
}
}
//3.发送响应
axios({
method:"post",
url:"http://localhost:8080/brand-demo/addServlet",
data:JSON.stringify(jsonData),
}).then(function (resp) {
if(resp.data == "success"){
window.alert("录入成功");
}
})
}
</script>
</body>
</html>12.AddBrand2.html（稍微的复杂方法，推荐）
<!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 id="brand" action="" method="post">
品牌名称：<input id="brandName" name="brandName"><br>
企业名称：<input id="companyName" name="companyName"><br>
排序：<input id="ordered" name="ordered"><br>
描述信息：<textarea rows="5" cols="20" id="description" name="description"></textarea><br>
状态：
<input type="radio" name="status" value="0">禁用
<input type="radio" checked="checked" name="status" value="1">启用<br>
<input type="button" id="btn" value="提交" onclick="req()">
</form>
<script src="js/axios-0.18.0.js"></script>
<script>
let getFromDate = function () {
let brandList = {}
return new Promise((resolve, reject) => {
let formDate = document.querySelector('#brand')
if ((formDate)) {
resolve(formDate.elements)
}
reject('没有读取到表单')
}).then(date => {
let arr = Array.from(date)
if ((!arr.length)) throw new Error('没有读到表单数据')
arr.forEach((ele, index, ar) => {
const {type, value, name, checked} = ele
if (value == '') throw new Error(`${name}值不能为空`)
if (type != 'button') {
if (type == 'radio' && !checked) return
Object.defineProperty(brandList, name, {
value,
writable: true,
enumerable: true
})
}
})
return brandList
}).catch(err => {
alert(err)
})
}
async function req(e) {
//获取表单数据
let data = await getFromDate()
data = JSON.stringify(data)
console.log(data)
axios({
method: "post",
url: "http://localhost:8080/brand-demo/addServlet",
data,
}).then(function (resp) {
console.log(resp)
}, err => {
alert(err.message)
})
}
</script>
</body>
</html>13.Brand.html
<!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%">
<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>
<tr align="center">
<td>1</td>
<td>三只松鼠</td>
<td>三只松鼠</td>
<td>100</td>
<td>三只松鼠，好吃不上火</td>
<td>启用</td>
<td><a href="#">修改</a> <a href="#">删除</a></td>
</tr>
<tr align="center">
<td>2</td>
<td>优衣库</td>
<td>优衣库</td>
<td>10</td>
<td>优衣库，服适人生</td>
<td>禁用</td>
<td><a href="#">修改</a> <a href="#">删除</a></td>
</tr>
<tr align="center">
<td>3</td>
<td>小米</td>
<td>小米科技有限公司</td>
<td>1000</td>
<td>为发烧而生</td>
<td>启用</td>
<td><a href="#">修改</a> <a href="#">删除</a></td>
</tr>
</table>
<script src="js/axios-0.18.0.js"></script>
<script>
//1.当页面加载完成后，发送ajax请求
window.onload = function (){
//2.发送ajax请求
axios({
method:"get",
url:"http://localhost:8080/brand-demo/selectAllServlet"
}).then(function (resp) {
//获取数据(servlect中获取数据之后的值返回一个集合brands,在axios中是以resp.data方式存在)
let brands = resp.data;
let tableData = " <tr>\n" +
" <th>序号</th>\n" +
" <th>品牌名称</th>\n" +
" <th>企业名称</th>\n" +
" <th>排序</th>\n" +
" <th>品牌介绍</th>\n" +
" <th>状态</th>\n" +
" <th>操作</th>\n" +
" </tr>";
//遍历集合，也就是js的数组
for (let i = 0; i < brands.length; i++) {
let brand = brands[i];
//把已经遍历出来的brand放到表格之中去
tableData +=" <tr align=\"center\">\n" +
" <td>"+(i+1)+"</td>\n" +
" <td>"+brand.brandName+"</td>\n" +
" <td>"+brand.companyName+"</td>\n" +
" <td>"+brand.ordered+"</td>\n" +
" <td>"+brand.description+"</td>\n" +
" <td>"+brand.status+"</td>\n" +
"\n" +
" <td><a href=\"#\">修改</a> <a href=\"#\">删除</a></td>\n" +
" </tr>";
}
//设置表格的数据
document.getElementById("brandTable").innerHTML = tableData;
})
}
</script>
</body>
</html>14.pom.xml（maven依赖）
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.example</groupId>
<artifactId>brand-demo</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<maven.compiler.source>18</maven.compiler.source>
<maven.compiler.target>18</maven.compiler.target>
</properties>
<packaging>war</packaging>
<build>
<plugins>
<!--tomcat 的插件 （相当于在maven内部放置了个tomcat服务器）-->
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.2</version>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>17</source>
<target>17</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>provided</scope>
</dependency>
<!--apache提供的与io适配的工具类，好用-->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<!--mybatis依赖-->
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.5.5</version>
</dependency>
<!--mysql依赖-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>8.0.29</version>
</dependency>
<!--junit依赖-->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.13.2</version>
<scope>Test</scope>
</dependency>
<!--添加slf4j-api日志api-->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>1.7.36</version>
</dependency>
<!--添加logback-classic依赖-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-classic</artifactId>
<version>1.2.3</version>
</dependency>
<!--添加logback-core依赖-->
<dependency>
<groupId>ch.qos.logback</groupId>
<artifactId>logback-core</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>jstl</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>taglibs</groupId>
<artifactId>standard</artifactId>
<version>1.1.2</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.62</version>
</dependency>
</dependencies>
</project>
15.总结：
1.后台代码比较简单，所以不过多进行叙述（想要了解，请看我之前发的文章）
2.前台代码出现了一个问题，是利用json还是js的对象格式进行发送，我本来是以为直接把数据封装到一个json之中就可以了，但是后台我在获取请求行的数据的时候出现了乱码，我原以为是编码的问题，然后经过高人指点发现，发现其实我需要的是js对象，并且经过实验之后，成功了，这个问题我现在都还有写迷糊，也许要等等过些时间缓过来之后就好了。
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