Java实现CSV格式转对象

package com.file.csv;

import com.obj.converter.Converter;
import com.reflect.ReflectUtil;
import com.string.PatternCommon;
import lombok.SneakyThrows;
import org.springframework.core.ParameterizedTypeReference;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * csv转对象
 * @Author: huanmin
 * @Date: 2022/6/18 15:59
 * @Version: 1.0
 * @Description: 文件作用详细描述....
 */
public class CSVToObj<T> extends ParameterizedTypeReference<T> {
    private String separator  ;  //默认分隔符
    private List<String> objects ;//数据
    private List<T> list=new ArrayList<>();//数据
    private Map<String,String> fieldsTypes = new LinkedHashMap<>();
    public CSVToObj(List<String> objects,String separator) {
        //特殊符号的处理
        this.separator = PatternCommon.division(separator);
        this.objects=objects;
    }
    //列,映射,转换的时候会和映射的顺序保持一致 ,默认使用当前文件的分隔符作为切割
    public CSVToObj<T>  mapping(String fieldNames){
        String[] split = fieldNames.split(separator);
        Class<? extends CSVToObj> aClass = ReflectUtil.deSerializable(getClass(),0);
        Field[] declaredFields = aClass.getDeclaredFields();
        for (String s : split) {
            for (Field declaredField : declaredFields) {
                declaredField.setAccessible(true);
                if(s.equals(declaredField.getName())){
                    fieldsTypes.put(declaredField.getName(), declaredField.getType().getTypeName());
                }
            }
        }
        return this;
    }

    @SneakyThrows
    public CSVToObj<T>  transform(){
        Class<? extends CSVToObj> aClass = ReflectUtil.deSerializable(getClass(),0);
        for (String object : objects) {
            String[] split = object.split(separator);
            T o = (T)aClass.newInstance();
            Field[] declaredFields = o.getClass().getDeclaredFields();
            for (int i = 0; i < declaredFields.length; i++) {
                Field declaredField = declaredFields[i];
                declaredField.setAccessible(true);
                if (fieldsTypes.containsKey(declaredField.getName())) {
                    declaredField.set(o, Converter.cast(split[i],fieldsTypes.get(declaredField.getName())));
                }
            }
            list.add(o);
        }
        return this;
    }
    public List<T>  result(){
        return list;
    }


}

package com.file;

import com.entity.UserData;
import com.file.csv.CSVToObj;
import com.file.csv.ReadAndWriteFileCSV;
import com.path.ResourceFileUtil;
import org.junit.Test;

import java.io.File;
import java.util.List;

/**
 * csv转对象测试
 *
 * @Author: huanmin
 * @Date: 2022/6/18 16:44
 * @Version: 1.0
 * @Description: 文件作用详细描述....
 */
public class CSVToObjTest {

    @Test
    public void show1(){
        File absoluteFileOrDirPathAndCreateNewFile = ResourceFileUtil.getAbsoluteFileOrDirPathAndCreateNewFile("/file/text.csv");
        //读取头部对应字段
        String head = ReadAndWriteFileCSV.readFirstLineOne(absoluteFileOrDirPathAndCreateNewFile);
        //去掉头部和尾部的多余信息,只显示内容
        List<String> list = ReadAndWriteFileCSV.readSkipHeadAndEnd(absoluteFileOrDirPathAndCreateNewFile);
        //做映射,然后转换csv格式为实体对象
        List<UserData> result = new CSVToObj<UserData>(list, "|"){}.mapping(head).transform().result();
        for (UserData userData : result) {
            System.out.println(userData);
        }
    }
    @Test
    public void show2(){
        File absoluteFileOrDirPathAndCreateNewFile = ResourceFileUtil.getAbsoluteFileOrDirPathAndCreateNewFile("/file/text.csv");
        //手动指定文件头部
        String head ="id|name|pass|age|sex|site";
        //去掉头部和尾部的多余信息,只显示内容
        List<String> list = ReadAndWriteFileCSV.readSkipHeadAndEnd(absoluteFileOrDirPathAndCreateNewFile);
        List<UserData> result = new CSVToObj<UserData>(list, "|"){}.mapping(head).transform().result();
        for (UserData userData : result) {
            System.out.println(userData);
        }
    }

    //
}