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springboot java 三层架构IOC和DI示例程序（黑马JAVAWEB）

liuaiguo75 2025-02-17 12:01:03
简介springboot java 三层架构IOC和DI示例程序（黑马JAVAWEB）

看黑马javaweb教程，练习JAVA 三层架构IOC和DI的练习：

项目文件结构：

DAO接口和实现类:

package com.wdf.project01.dao;

import com.wdf.project01.pojo.Emp;

import java.util.List;

public interface EmpDao {
    //获取员工列表
    public List<Emp> listEmp();
}

package com.wdf.project01.dao.impl;

import com.wdf.project01.dao.EmpDao;
import com.wdf.project01.pojo.Emp;
import com.wdf.project01.utils.XmlParserUtils;
import org.springframework.stereotype.Component;

import java.util.List;
@Component
public class EmpDaoA implements EmpDao {
    @Override
    public List<Emp> listEmp() {
        String file = this.getClass().getClassLoader().getResource("emp.xml").getFile();
        //System.out.println(file);
        List<Emp> empList = XmlParserUtils.parse(file,Emp.class);
        return empList;
    }
}

Service接口和实现类型：

package com.wdf.project01.service;

import com.wdf.project01.pojo.Emp;
import org.springframework.stereotype.Service;

import java.util.List;

public interface EmpService {
    public List<Emp> listEmp();
}


package com.wdf.project01.service.impl;

import com.wdf.project01.pojo.Emp;
import com.wdf.project01.dao.EmpDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;
import com.wdf.project01.service.EmpService;

import java.util.List;
@Component
public class EmpServiceImpl implements EmpService {
    @Autowired
    private EmpDao empDao;
    @Override
    public List<Emp> listEmp() {
        List<Emp> empList = empDao.listEmp();
        empList.stream().forEach(emp->{
            //处理数据
            String gender = emp.getGender();
            if ("1".equals(gender)){
                emp.setGender("男");
            }else if("2".equals(gender)){
                emp.setGender("女");
            }
            String job = emp.getJob();
            if ("1".equals(job)){
                emp.setJob("副教授");
            }else if("2".equals(job)){
                emp.setJob("教授");
            }else if("3".equals(job)){
                emp.setJob("讲师");
            }
        });
        return empList;
    }
}

controller操作类型：

package com.wdf.project01.controller;

import com.wdf.project01.pojo.Emp;
import com.wdf.project01.pojo.Result;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import com.wdf.project01.service.EmpService;

import java.util.List;

@RestController
public class EmpController {
    @Autowired
     private EmpService empService;
    @RequestMapping("/listEmp")
    public Result list(){
      List<Emp> empList = empService.listEmp();
        return Result.success(empList);
    }
}

Emp 实体类：

package com.wdf.project01.pojo;

public class Emp {
    private String name;
    private Integer age;
    private String image;
    private String gender;
    private String job;

    public Emp() {
    }

    public Emp(String name, Integer age, String image, String gender, String job) {
        this.name = name;
        this.age = age;
        this.image = image;
        this.gender = gender;
        this.job = job;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String getImage() {
        return image;
    }

    public void setImage(String image) {
        this.image = image;
    }

    public String getGender() {
        return gender;
    }

    public void setGender(String gender) {
        this.gender = gender;
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }

    @Override
    public String toString() {
        return "Emp{" +
                "name='" + name + ''' +
                ", age=" + age +
                ", image='" + image + ''' +
                ", gender='" + gender + ''' +
                ", job='" + job + ''' +
                '}';
    }
}

前端页面代码：

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>员工信息</title>
</head>

<link rel="stylesheet" href="element-ui/index.css">
<script src="./js/vue.js"></script>
<script src="./element-ui/index.js"></script>
<script src="./js/axios-0.18.0.js"></script>

<body>
    <h1 align="center">员工信息列表展示</h1>
    <div id="app">
        <el-table :data="tableData" style="width: 100%"  stripe border >
            <el-table-column prop="name" label="姓名" align="center" min-width="20%"></el-table-column>
            <el-table-column prop="age" label="年龄" align="center" min-width="20%"></el-table-column>
            <el-table-column label="图像" align="center"  min-width="20%">
                <template slot-scope="scope">
                    <el-image :src="scope.row.image" style="width: 80px; height: 50px;"></el-image>
                </template>
            </el-table-column>
            <el-table-column prop="gender" label="性别" align="center"  min-width="20%"></el-table-column>
            <el-table-column prop="job" label="职位" align="center"  min-width="20%"></el-table-column>
        </el-table>
    </div>
</body>

<style>
    .el-table .warning-row {
        background: oldlace;
    }
    .el-table .success-row {
        background: #f0f9eb;
    }
</style>

<script>
    new Vue({
        el: "#app",
        data() {
            return {
                tableData: []
            }
        },
        mounted(){
            axios.get('/listEmp').then(res=>{
                if(res.data.code){
                    this.tableData = res.data.data;
                }
            });
        },
        methods: {
        }
    });
</script>
</html>

工具类xml文件读取类:

package com.wdf.project01.utils;

import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

public class XmlParserUtils {

    public static <T> List<T> parse(String file , Class<T> targetClass)  {
        ArrayList<T> list = new ArrayList<T>(); //封装解析出来的数据
        try {
            //1.获取一个解析器对象
            SAXReader saxReader = new SAXReader();
            //2.利用解析器把xml文件加载到内存中,并返回一个文档对象
            Document document = saxReader.read(new File(file));
            //3.获取到根标签
            Element rootElement = document.getRootElement();
            //4.通过根标签来获取 user 标签
            List<Element> elements = rootElement.elements("emp");

            //5.遍历集合,得到每一个 user 标签
            for (Element element : elements) {
                //获取 name 属性
                String name = element.element("name").getText();
                //获取 age 属性
                String age = element.element("age").getText();
                //获取 image 属性
                String image = element.element("image").getText();
                //获取 gender 属性
                String gender = element.element("gender").getText();
                //获取 job 属性
                String job = element.element("job").getText();

                //组装数据
                Constructor<T> constructor = targetClass.getDeclaredConstructor(String.class, Integer.class, String.class, String.class, String.class);
                constructor.setAccessible(true);
                T object = constructor.newInstance(name, Integer.parseInt(age), image, gender, job);

                list.add(object);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

}

pom.xml文件：

<?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.wdf</groupId>
    <artifactId>project01</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>project01</name>
    <description>project01</description>
    <properties>
        <java.version>1.8</java.version>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <spring-boot.version>2.6.13</spring-boot.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>2.1.3</version>
        </dependency>
    </dependencies>
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>${spring-boot.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>
</project>

前端页面资源文件结构：

代码地址：project01: javaweb三层架构及IOC程序

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