CSVアップロードデータ

OperationクラスのCVS

package src.imp;

import com.alibaba.fastjson.JSON;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**   
 * CSV操作(导出和导入)
 *
 * @version 1.0 Jan 27, 2014 4:30:58 PM   
 */
public class CSVUtils<T> {

    private Class<T> tClass;

    private final String filePath;

    public CSVUtils(String filePath){this.filePath = filePath;}

    /**
     * 导出
     * 
     * @param file csv文件(路径+文件名)，csv文件不存在会自动创建
     * @param dataList 数据
     * @return
     */
    public boolean exportCsv(File file, List<String> dataList){
        boolean isSucess=false;

        
        FileOutputStream out=null;
        OutputStreamWriter osw=null;
        BufferedWriter bw=null;
        try {
            out = new FileOutputStream(file);
            osw = new OutputStreamWriter(out);
            bw =new BufferedWriter(osw);
            if(dataList!=null && !dataList.isEmpty()){
                for(String data : dataList){
                    bw.append(data).append("\r");
                }
            }
            isSucess=true;
        } catch (Exception e) {
            isSucess=false;
        }finally{
            if(bw!=null){
                try {
                    bw.close();
                    bw=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
            if(osw!=null){
                try {
                    osw.close();
                    osw=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
            if(out!=null){
                try {
                    out.close();
                    out=null;
                } catch (IOException e) {
                    e.printStackTrace();
                } 
            }
        }
        
        return isSucess;
    }
    

    /**
     * 导入
     * @param culumNames 字段名（与列对应）
     * @return
     */
    public List<T> importCvs(String... culumNames){
        List<String> dataList=new ArrayList<String>();
        File file = new File(filePath);

        BufferedReader br=null;
        try {
            br = new BufferedReader(new FileReader(file));
            String line = "";
            while ((line = br.readLine()) != null) {
                dataList.add(line);
            }
        }catch (Exception e) {
        }finally{
            if(br!=null){
                try {
                    br.close();
                    br=null;
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        List<T> allData = parseListT(dataList, culumNames);
        return allData;
    }

    private List<T> parseListT(List<String> dataList, String[] culumNames) {
        List<T> allData = new ArrayList<>();
        if(dataList!=null && !dataList.isEmpty()){
            for(String data : dataList){
                String[] culums = data.split(",");
                Map<String, String> oneObjectMap = new HashMap<>();
                for (int i = 0; i < culumNames.length; i++) {
                    oneObjectMap.put(culumNames[i], culums[i]);
                }
                T t = JSON.parseObject(JSON.toJSONString(oneObjectMap), tClass);
                allData.add(t);
            }
        }
        return allData;
    }

}

テストカテゴリ

package src.geym.ch2;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import com.alibaba.fastjson.JSON;
import com.sun.tools.internal.xjc.reader.xmlschema.bindinfo.BIConversion;
import org.junit.Test;
import src.imp.CSVUtils;
import src.imp.User;

/**
 * CSV操作(导出和导入)
 * 
 * @version 1.0 Jan 27, 2014 4:17:02 PM
 */
public class CsvTest {


    /**
     * CSV导出
     * 
     * @throws Exception
     */
    @Test
    public void importCsv()  {
        CSVUtils<User> csvUtils = new CSVUtils("/Users/sean/iCloud 云盘（归档）/Desktop/java-web/workspace/prj_src/src/main/resources/ljq.csv");
        String[] titile = {"id", "age", "name"};
        List<User> users = csvUtils.importCvs( titile);
        System.out.println(JSON.toJSONString(users));
    }
    
    
}

ユーザー

package src.imp;

/**
 * TODO
 *
 * @author sean
 * @date 2020/4/2 6:39 PM
 */
public class User{
    private String id;
    private String age;
    private String name;

    public User(String id, String age, String name) {
        this.id = id;
        this.age = age;
        this.name = name;
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getAge() {
        return age;
    }

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

    public String getName() {
        return name;
    }

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