JavaWeb开发教程：2023.3.27第二十九天，SpringBootWeb请求响应

前言

记录时间：2023.3.27

已坚持的第二十九天

java从入门到精通

学习java时间历程记录打卡

早上7：00到 12：00

下午2：00到 5：00

JavaWeb-SpringBootWeb请求响应总结

完成代码练习

1.目录结构

1.controller控制类

package cn.vqqc.controller;

import cn.vqqc.pojo.Emp;
import cn.vqqc.pojo.Result;
import cn.vqqc.service.EmpService;
import cn.vqqc.utils.XmlParserUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

//import javax.annotation.Resource;
import java.util.List;

@RestController
public class EmpController {
//
//    @Qualifier("empServiceA")
//    @Autowired //运行时, IOC容器会提供该类型的bean对象,并赋值给该变量 - 依赖注入
//    private EmpService empService ;

    private EmpService empService ;

    @RequestMapping("/listEmp")
    public Result list(){
        //1. 调用service, 获取数据
        List<Emp> empList = empService.listEmp();

        //3. 响应数据
        return Result.success(empList);
    }

//
//    @RequestMapping("/listEmp")
//    public Result list(){
//        //1. 加载并解析emp.xml
//        String file = this.getClass().getClassLoader().getResource("emp.xml").getFile();
//        System.out.println(file);
//        List<Emp> empList = XmlParserUtils.parse(file, Emp.class);
//
//        //2. 对数据进行转换处理 - gender, job
//        empList.stream().forEach(emp -> {
//            //处理 gender 1: 男, 2: 女
//            String gender = emp.getGender();
//            if("1".equals(gender)){
//                emp.setGender("男");
//            }else if("2".equals(gender)){
//                emp.setGender("女");
//            }
//
//            //处理job - 1: 讲师, 2: 班主任 , 3: 就业指导
//            String job = emp.getJob();
//            if("1".equals(job)){
//                emp.setJob("讲师");
//            }else if("2".equals(job)){
//                emp.setJob("班主任");
//            }else if("3".equals(job)){
//                emp.setJob("就业指导");
//            }
//        });
//
//        //3. 响应数据
//        return Result.success(empList);
//    }
//
}

package cn.vqqc.controller;

import cn.vqqc.pojo.User;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.*;

//import javax.servlet.http.HttpServletRequest;
import java.time.LocalDateTime;
import java.util.Arrays;
import java.util.List;

/**
 * 测试请求参数接收
 */
@RestController
//@Controller
//@ResponseBody
public class RequestController {

     //1. 简单参数
     //原始方式
//    @RequestMapping("/simpleParam")
//    public String simpleParam(HttpServletRequest request){
//        //获取请求参数
//        String name = request.getParameter("name");
//        String ageStr = request.getParameter("age");
//
//        int age = Integer.parseInt(ageStr);
//        System.out.println(name+ ":" + age);
//        return "OK";
//    }

    //springboot方式
//    @RequestMapping("/simpleParam")
//    public String simpleParam(String name, Integer age){
//        System.out.println(name+ ":" + age);
//        return "OK";
//    }

    @RequestMapping("/simpleParam")
    public String simpleParam(@RequestParam(name = "name", required = false) String username, Integer age){
        System.out.println(username+ ":" + age);
        return "OK";
    }


    //2. 实体参数
    @RequestMapping("/simplePojo")
    public String simplePojo(User user){
        System.out.println(user);
        return "OK";
    }

    @RequestMapping("/complexPojo")
    public String complexPojo(User user){
        System.out.println(user);
        return "OK";
    }

    //3. 数组集合参数
    @RequestMapping("/arrayParam")
    public String arrayParam(String[] hobby){
        System.out.println(Arrays.toString(hobby));
        return "OK";
    }

    @RequestMapping("/listParam")
    public String listParam(@RequestParam List<String> hobby){
        System.out.println(hobby);
        return "OK";
    }

    //4. 日期时间参数
    @RequestMapping("/dateParam")
    public String dateParam(@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss") LocalDateTime updateTime){
        System.out.println(updateTime);
        return "OK";
    }

    //5. json参数
    @RequestMapping("/jsonParam")
    public String jsonParam(@RequestBody User user){
        System.out.println(user);
        return "OK";
    }

    //6. 路径参数
    @RequestMapping("/path/{id}")
    public String pathParam(@PathVariable Integer id){
        System.out.println(id);
        return "OK";
    }

    @RequestMapping("/path/{id}/{name}")
    public String pathParam2(@PathVariable Integer id , @PathVariable String name){
        System.out.println(id);
        System.out.println(name);
        return "OK";
    }
}

package cn.vqqc.controller;

import cn.vqqc.pojo.Address;
import cn.vqqc.pojo.Result;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.ArrayList;
import java.util.List;

/**
 * 测试响应数据
 */
@RestController
public class ResponseController {

    /*@RequestMapping("/hello")
    public String hello(){
        System.out.println("Hello World ~");
        return "Hello World ~";
    }

    @RequestMapping("/getAddr")
    public Address getAddr(){
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        return addr;
    }

    @RequestMapping("/listAddr")
    public List<Address> listAddr(){
        List<Address> list = new ArrayList<>();

        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");

        Address addr2 = new Address();
        addr2.setProvince("陕西");
        addr2.setCity("西安");

        list.add(addr);
        list.add(addr2);
        return list;
    }*/


    @RequestMapping("/hello")
    public Result hello(){
        System.out.println("Hello World ~");
        //return new Result(1,"success","Hello World ~");
        return Result.success("Hello World ~");
    }

    @RequestMapping("/getAddr")
    public Result getAddr(){
        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");
        return Result.success(addr);
    }

    @RequestMapping("/listAddr")
    public Result listAddr(){
        List<Address> list = new ArrayList<>();

        Address addr = new Address();
        addr.setProvince("广东");
        addr.setCity("深圳");

        Address addr2 = new Address();
        addr2.setProvince("陕西");
        addr2.setCity("西安");

        list.add(addr);
        list.add(addr2);
        return Result.success(list);
    }
}

2.三层结构：dao数据访问类

package cn.vqqc.dao.impl;

import cn.vqqc.dao.EmpDao;
import cn.vqqc.pojo.Emp;
import cn.vqqc.utils.XmlParserUtils;
import org.springframework.stereotype.Repository;

import java.util.List;

//@Component //将当前类交给IOC容器管理, 成为IOC容器中的bean
@Repository//("daoA")
public class EmpDaoA implements EmpDao {
    @Override
    public List<Emp> listEmp() {
        //1. 加载并解析emp.xml
        String file = this.getClass().getClassLoader().getResource("emp.xml").getFile();
        System.out.println(file);
        List<Emp> empList = XmlParserUtils.parse(file, Emp.class);
        return empList;
    }
}

1.定义接口

package cn.vqqc.dao;

import cn.vqqc.pojo.Emp;

import java.util.List;

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

3.pojo定义类

package cn.vqqc.pojo;

public class Address {
    private String province;
    private String city;

    @Override
    public String toString() {
        return "Address{" +
                "province='" + province + '\'' +
                ", city='" + city + '\'' +
                '}';
    }

    public String getProvince() {
        return province;
    }

    public void setProvince(String province) {
        this.province = province;
    }

    public String getCity() {
        return city;
    }

    public void setCity(String city) {
        this.city = city;
    }
}

package cn.vqqc.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 + '\'' +
                '}';
    }
}

package cn.vqqc.pojo;

/**
 * 统一响应结果封装类
 */
public class Result {
    private Integer code ;//1 成功 , 0 失败
    private String msg; //提示信息
    private Object data; //数据 date

    public Result() {
    }
    public Result(Integer code, String msg, Object data) {
        this.code = code;
        this.msg = msg;
        this.data = data;
    }
    public Integer getCode() {
        return code;
    }
    public void setCode(Integer code) {
        this.code = code;
    }
    public String getMsg() {
        return msg;
    }
    public void setMsg(String msg) {
        this.msg = msg;
    }
    public Object getData() {
        return data;
    }
    public void setData(Object data) {
        this.data = data;
    }

    public static Result success(Object data){
        return new Result(1, "success", data);
    }
    public static Result success(){
        return new Result(1, "success", null);
    }
    public static Result error(String msg){
        return new Result(0, msg, null);
    }

    @Override
    public String toString() {
        return "Result{" +
                "code=" + code +
                ", msg='" + msg + '\'' +
                ", data=" + data +
                '}';
    }
}

package cn.vqqc.pojo;

public class User {
    private String name;
    private Integer age;

    private Address address;

    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 Address getAddress() {
        return address;
    }

    public void setAddress(Address address) {
        this.address = address;
    }

    @Override
    public String toString() {
        return "User{" +
                "name='" + name + '\'' +
                ", age=" + age +
                ", address=" + address +
                '}';
    }
}

4.service数据类

package cn.vqqc.service.impl;

import cn.vqqc.dao.EmpDao;
import cn.vqqc.pojo.Emp;
import cn.vqqc.service.EmpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.util.List;

@Primary
//@Component //将当前类交给IOC容器管理, 成为IOC容器中的bean
@Service
public class EmpServiceA implements EmpService {

    @Autowired //运行时, IOC容器会提供该类型的bean对象,并赋值给该变量 - 依赖注入
    private EmpDao empDao;

    @Override
    public List<Emp> listEmp() {
        //1. 调用dao, 获取数据
        List<Emp> empList = empDao.listEmp();

        //2. 对数据进行转换处理 - gender, job
        empList.stream().forEach(emp -> {
            //处理 gender 1: 男, 2: 女
            String gender = emp.getGender();
            if("1".equals(gender)){
                emp.setGender("男");
            }else if("2".equals(gender)){
                emp.setGender("女");
            }

            //处理job - 1: 讲师, 2: 班主任 , 3: 就业指导
            String job = emp.getJob();
            if("1".equals(job)){
                emp.setJob("讲师");
            }else if("2".equals(job)){
                emp.setJob("班主任");
            }else if("3".equals(job)){
                emp.setJob("就业指导");
            }
        });
        return empList;
    }
}

package cn.vqqc.service.impl;

import cn.vqqc.dao.EmpDao;
import cn.vqqc.pojo.Emp;
import cn.vqqc.service.EmpService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Primary;
import org.springframework.stereotype.Component;
import org.springframework.stereotype.Service;

import java.util.List;


//@Component //将当前类交给IOC容器管理, 成为IOC容器中的bean
@Service
public class EmpServiceB implements EmpService {

    @Autowired //运行时, IOC容器会提供该类型的bean对象,并赋值给该变量 - 依赖注入
    private EmpDao empDao;

    @Override
    public List<Emp> listEmp() {
        //1. 调用dao, 获取数据
        List<Emp> empList = empDao.listEmp();

        //2. 对数据进行转换处理 - gender, job
        empList.stream().forEach(emp -> {
            //处理 gender 1: 男, 2: 女
            String gender = emp.getGender();
            if("1".equals(gender)){
                emp.setGender("男士");
            }else if("2".equals(gender)){
                emp.setGender("女士");
            }

            //处理job - 1: 讲师, 2: 班主任 , 3: 就业指导
            String job = emp.getJob();
            if("1".equals(job)){
                emp.setJob("讲师");
            }else if("2".equals(job)){
                emp.setJob("班主任");
            }else if("3".equals(job)){
                emp.setJob("就业指导");
            }
        });
        return empList;
    }
}

1.定义接口

package cn.vqqc.service;

import cn.vqqc.pojo.Emp;

import java.util.List;

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

5.工具类

package cn.vqqc.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;
    }

}

6.启动类

package cn.vqqc;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

//@ComponentScan({"com.vqqc.dao","com.vqqc"})
@SpringBootApplication //默认扫描当前包及其子包
public class SpringbootWebReqRespApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringbootWebReqRespApplication.class, args);
    }

}

7.pom.xml配置

<?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>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.5</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>cn.vqqc</groupId>
    <artifactId>springboot-web-req-resp</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>springboot-web-req-resp</name>
    <description>springboot-web-req-resp</description>
    <properties>
        <java.version>17</java.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-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- 解析XML -->
        <dependency>
            <groupId>org.dom4j</groupId>
            <artifactId>dom4j</artifactId>
            <version>2.1.1</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>