第四次课后练习《web应用技术》

已于 2024-04-23 23:30:12 修改
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于 2024-04-22 00:20:26 首次发布
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要求：读取xml文件并在页面中显示出来。

采用三种方式实现，并体会其中的原理：

准备工作 

引入dom4j文件

2、引入解析XML的工具类XMLParserUtils.java、对应的实体类Poet.java、XML文件poet.xml 

 XMLParserUtils.java

package com.itheying.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("writer");

            //5.遍历集合,得到每一个 user 标签
            for (Element element : elements) {
                //获取 author 属性
                String number = element.element("number").getText();
                //获取 author 属性
                String author = element.element("author").getText();
                //获取 gender 属性
                String gender = element.element("gender").getText();
                //获取 dynasty 属性
                String dynasty = element.element("dynasty").getText();
                //获取 title 属性
                String title = element.element("title").getText();
                //获取 style 属性
                String style = element.element("style").getText();

                //组装数据
                Constructor<T> constructor = targetClass.getDeclaredConstructor(Integer.class,String.class, String.class, String.class, String.class, String.class);
                constructor.setAccessible(true);
                T object = constructor.newInstance(Integer.parseInt(number),author, gender, dynasty, title, style);

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

}

 ②对应的实体类Poet.java

package com.itheying.pojo;


public class Poet {
    private Integer number;
    private String author;
    private String gender;
    private String dynasty;
    private String title;
    private String style;

    public Poet(Integer number, String author, String gender, String dynasty, String title, String style) {
        this.number = number;
        this.author = author;
        this.gender = gender;
        this.dynasty = dynasty;
        this.title = title;
        this.style = style;
    }

    public Integer getNumber() {
        return number;
    }

    public void setNumber(Integer number) {
        this.number = number;
    }

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public String getGender() {
        return gender;
    }

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

    public String getDynasty() {
        return dynasty;
    }

    public void setDynasty(String dynasty) {
        this.dynasty = dynasty;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getStyle() {
        return style;
    }

    public void setStyle(String style) {
        this.style = style;
    }

    @Override
    public String toString() {
        return "Poet{" +
                "number=" + number +
                ", author='" + author + '\'' +
                ", gender='" + gender + '\'' +
                ", dynasty='" + dynasty + '\'' +
                ", title='" + title + '\'' +
                ", style='" + style + '\'' +
                '}';
    }
}

 ③poet.xml

<?xml version="1.0" encoding="UTF-8" ?>
<writers>
    <writer>
        <number>1</number>
        <author>陶渊明</author>
        <gender>1</gender>
        <dynasty>东晋末至南朝宋初期</dynasty>
        <title>诗人和辞赋家</title>
        <style>古今隐逸诗人之宗</style>
    </writer>
    <writer>
        <number>2</number>
        <author>王维</author>
        <gender>1</gender>
        <dynasty>唐代</dynasty>
        <title>诗佛</title>
        <style>空灵、寂静</style>
    </writer>
    <writer>
        <number>3</number>
        <author>李白</author>
        <gender>1</gender>
        <dynasty>唐代</dynasty>
        <title>诗仙</title>
        <style>豪放飘逸的诗风和丰富的想象力</style>
    </writer>
    <writer>
        <number>4</number>
        <author>李商隐</author>
        <gender>2</gender>
        <dynasty>唐代</dynasty>
        <title>诗坛鬼才</title>
        <style>无</style>
    </writer>
    <writer>
        <number>5</number>
        <author>李清照</author>
        <gender>2</gender>
        <dynasty>宋代</dynasty>
        <title>女词人</title>
        <style>婉约风格</style>
    </writer>
    <writer>
        <number>6</number>
        <author>杜甫</author>
        <gender>1</gender>
        <dynasty>唐代</dynasty>
        <title>诗圣</title>
        <style>反映社会现实和人民疾苦</style>
    </writer>
    <writer>
        <number>7</number>
        <author>苏轼</author>
        <gender>1</gender>
        <dynasty>北宋</dynasty>
        <title>文学家、书画家，诗神</title>
        <style>清新豪健的诗风和独特的艺术表现力</style>
    </writer>
</writers>

页面显示 

1、常规方式，controlller控制器不分层

页面 

PoetController.java

获取数据 

package com.itheying.controller;

import com.itheying.pojo.Poet;
import com.itheying.pojo.Result;
import com.itheying.utils.XmlParserUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class PoetController {

    @RequestMapping("/listPoet")
    public Result list(){
        //1.加载并解析Poet.xml

        String file=this.getClass().getClassLoader().getResource("Poet.xml").getFile();
        List<Poet> poetList = XmlParserUtils.parse(file, Poet.class);

        //2.对数据进行处理
        poetList.stream().forEach(poet ->{
            //处理gender男或者女
            String gender=poet.getGender();
            if ("1".equals(gender)){
                poet.setGender("男");
            }else if("2".equals(gender)){
                poet.setGender("女");
            }
        });

        //相应数据
        return Result.success(poetList);

    }
}

2、按照MVC的分层方式实现，常规java代码方式

三层架构的原理

Controller层：

package com.itheying.controller;

import com.itheying.pojo.Poet;
import com.itheying.pojo.Result;
import com.itheying.service.PoetService;
import com.itheying.service.impl.PoetServiceA;
import com.itheying.utils.XmlParserUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.util.List;

@RestController
public class PoetController {
    //定义service层对象
    private PoetService poetService=new PoetServiceA() ;
    @RequestMapping("/listPoet")
    public Result list(){
        //1.调用Service获取数据
        List<Poet> poetList = poetService.listPoet();
        //2.接受请求，响应数据
        return Result.success(poetList);


    }
}
/*@RestController
public class PoetController {

    @RequestMapping("/listPoet")
    public Result list(){
        //1.加载并解析Poet.xml
        //数据访问
        String file=this.getClass().getClassLoader().getResource("Poet.xml").getFile();
        System.out.println(file);
        List<Poet> poetList= XmlParserUtils.parse(file, Poet.class);

        //2.对数据进行处理
        //逻辑处理
        poetList.stream().forEach(poet ->{
            //处理gender男或者女
            String gender=poet.getGender();
            if ("1".equals(gender)){
                poet.setGender("男");
            }else if("2".equals(gender)){
                poet.setGender("女");
            }
        });

        //接受请求，响应数据
        return Result.success(poetList);


    }
}*/

Service层：

接口是为了增强程序的灵活性和拓展性 

PoetService接口： 

package com.itheying.service;

import com.itheying.pojo.Poet;

import java.util.List;

public interface PoetService {
    //获取员工列表数据
    public List<Poet> listPoet();
}

 PoetServiceA.java

package com.itheying.service.impl;


import com.itheying.dao.PoetDao;
import com.itheying.dao.impl.PoetDaoA;
import com.itheying.pojo.Poet;
import com.itheying.service.PoetService;

import java.util.List;

public class PoetServiceA implements PoetService {
    //创建dao层的对象 ctrl+alt+v
    private PoetDao poetDao=new PoetDaoA() ;
    @Override
    public List<Poet> listPoet() {
        //调用dao层来获取数据
        List<Poet> poetList = poetDao.listPoet();
        //2.对数据进行处理
        //逻辑处理
        poetList.stream().forEach(poet ->{
            //处理gender男或者女
            String gender=poet.getGender();
            if ("1".equals(gender)){
                poet.setGender("男");
            }else if("2".equals(gender)){
                poet.setGender("女");
            }
        });
        return poetList;
    }
}

dao层：

poetDaoA接口 ：

package com.itheying.dao;


import com.itheying.pojo.Poet;

import java.util.List;

public interface PoetDao {
    //获取作者列表数据
    public List<Poet> listPoet();
}

 PoetDaoA.java

package com.itheying.dao.impl;

import com.itheying.dao.PoetDao;
import com.itheying.pojo.Poet;
import com.itheying.utils.XmlParserUtils;

import java.util.List;

public  class PoetDaoA implements PoetDao{
    @Override
    public List<Poet> listPoet() {
        //1.加载并解析Poet.xml
        //数据访问
        String file=this.getClass().getClassLoader().getResource("Poet.xml").getFile();
        System.out.println(file);
        List<Poet> poetList= XmlParserUtils.parse(file, Poet.class);
        return poetList;
    }
}

3、采用控制反转和依赖注入的MVC方式实现。

软件设计的原则：高内聚，低耦合 

 

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