JavaWeb + Ajax + HTML 添加数据数据与查询数据，（利用axios响应与json数据传输）_java+html+axios实现前后端交互

目录

1.文件结构 

 2.BrandMaper接口

3.Brand实体类

4.BrandService

5.SqlSessionFactoryUtils工具类

6.AddServlet添加Servlet类

7.SelectAllServlet查询Serrvlet类

8.BrandMapper.xml映射文件

9.mybatis-config.xml

10.js包下axios-0.18.0.js

11.AddBrand.html（简单方法，比较low）

12.AddBrand2.html（稍微的复杂方法，推荐）

13.Brand.html

14.pom.xml（maven依赖）

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。

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&amp;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.map

11.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。