Java implements csv file conversion to xml

1. Demand

        Read the content from the csv file and write it to the xml file

Two, realize

        The first step is to read the content from csv

        The second step is to write the read content to xml

       Note: The hutool framework is used to read the content of the csv file, so you need to add dependencies to the pom file

        

<dependency>
     <groupId>cn.hutool</groupId>
     <artifactId>hutool-all</artifactId>
     <version>4.1.19</version>
</dependency>

code show as below:

    

package com.lsl.mylsl.controller;

import cn.hutool.core.io.FileUtil;
import cn.hutool.core.text.csv.CsvData;
import cn.hutool.core.text.csv.CsvReader;
import cn.hutool.core.text.csv.CsvRow;
import cn.hutool.core.text.csv.CsvUtil;
import cn.hutool.core.util.CharsetUtil;
import com.lsl.mylsl.module.Student;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

public class MyTest {



    public static void main(String[] args) {

        List<Student> studentList = readCsv();
        createXml(studentList);

    }

    /**
     * 利用hutool框架读取csv文件内容到list
     */
    public static List<Student> readCsv() {
        CsvReader reader = CsvUtil.getReader();
        //从文件中读取CSV数据
        CsvData data = reader.read(FileUtil.file("C:\\Users\\perfe\\Desktop\\list.csv"), CharsetUtil.CHARSET_GBK);
        List<CsvRow> rows = data.getRows();

        for (CsvRow row : rows) {
            List<String> rawList = row.getRawList();
            System.out.println(rawList);
        }
        //csv文件的列依次是id,stuName,age,addr
        List<Student> studentList = new ArrayList<>();
        for (int i = 1; i < rows.size(); i++) {
            CsvRow row = rows.get(i);
            Student stu = new Student();
            List<String> rawList = row.getRawList();
            stu.setId(Integer.valueOf(rawList.get(0)));
            stu.setStuName(rawList.get(1));
            stu.setAge(Integer.valueOf(rawList.get(2)));
            stu.setAddr(rawList.get(3));
            studentList.add(stu);
        }

        System.out.println(studentList);
        return studentList;
    }


    /**
     * 创建xml并写入从csv读取的内容
     * @param studentList
     */
    public static void createXml(List<Student> studentList){
        try {
            // 创建解析器工厂
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder db = factory.newDocumentBuilder();
            Document document = db.newDocument();
            // 不显示standalone="no"
            document.setXmlStandalone(true);
            Element students = document.createElement("students");

            for (Student stu : studentList){
                Element student = document.createElement("student");
                student.setAttribute("flag", "true");

                Element id = document.createElement("id");
                id.setTextContent(stu.getId()+"");
                student.appendChild(id);

                Element name = document.createElement("name");
                name.setTextContent(stu.getStuName());
                student.appendChild(name);

                Element age = document.createElement("age");
                age.setTextContent(stu.getAge()+"");
                student.appendChild(age);

                Element addr = document.createElement("addr");
                addr.setTextContent(stu.getAddr());
                student.appendChild(addr);

                students.appendChild(student);

            }

            // 将students节点（已包含student）添加到dom树中
            document.appendChild(students);

            // 创建TransformerFactory对象
            TransformerFactory tff = TransformerFactory.newInstance();
            // 创建 Transformer对象
            Transformer tf = tff.newTransformer();

            // 输出内容是否使用换行
            tf.setOutputProperty(OutputKeys.INDENT, "yes");
            // 创建xml文件并写入内容
            tf.transform(new DOMSource(document), new StreamResult(new File("D:\\Download\\students.xml")));
            System.out.println("生成student.xml成功");
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("生成student.xml失败");
        }
    }




//    public static void filter(List<String> list){
//
//        for (int m=list.size()-1;m==0;m--){
//            if (!"a".equals(list.get(m))){
//                list.remove(m);
//            }
//        }
//
//    }
//
//    public byte[] blobToByte(Blob blob) throws Exception {
//        byte[] bytes = null;
//        try {
//            InputStream in=blob.getBinaryStream();
//            BufferedInputStream inBuffered = new BufferedInputStream(in);
//            ByteArrayOutputStream out = new ByteArrayOutputStream(1024);
//            byte[] temp = new byte[1024];
//            int size = 0;
//            while ((size = inBuffered.read(temp)) != -1) {
//                out.write(temp, 0, size);
//            }
//            inBuffered.close();
//            in.close();
//            bytes = out.toByteArray();
//        } catch(Exception ex){
//            ex.printStackTrace();
//        }
//        return bytes;
//    }

}

Generate a screenshot as follows: