Java实现将类数据逐行写入CSV文件的方法详解

public class CodeObject {
    private String filePath;
    private String methodName;
    private String content;
 
    public void setFilePath(String filePath){ this.filePath = filePath;}
    public void setMethodName(String methodName) { this.methodName = methodName;}
    public void setContent(String content) { this.content = content;}
 
    public String getFilePath() { return filePath;}
    public String getMethodName() { return methodName;}
    public String getContent() { return content;}
}

import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
 
public class mycsv {
    private File csvFile;
 
    public mycsv(String fileName){
        try {
            csvFile = new File(fileName);
            if (!csvFile.exists()){
                csvFile.createNewFile();
            }
        }catch (IOException e){
            System.out.println("error in io");
        }
    }
    public void writeCSVFile(String header[], ArrayList<CodeObject> cos){
        try{
            FileWriter fw  = new FileWriter(csvFile);
            BufferedWriter bw = new BufferedWriter(fw);
            // 写表头
            for (int i = 0; i < header.length; i++){
                if (i < header.length-1){
                    bw.append(header[i] + ",");
                }else{
                    bw.append(header[i] + "\r\n");
                }
            }
            // 写数据
            for(CodeObject co: cos){
                bw.append(co.getFilePath()+",");
                bw.append(co.getMethodName()+",");
                bw.append(CSVFormatter(co.getContent())+"\r\n");
            }
            bw.close();
            fw.close();
        }catch (IOException e){
            System.out.println("error in io");
        }
    }
    public String CSVFormatter(String s){
        if (s == null) {
            return "";
        }
        if (s.contains("\"")) {
            s = s.replaceAll("\"", "\"\"");
        }
        return "\"" + s + "\"";
    }
}

public static void main(String[] args) {
        ArrayList<CodeObject> methods = new ArrayList<>();
        /*
            一些操作将数据写入methods中
        */
        String header[] = {"FilePath", "MethodName", "Content"};
        mycsv m = new mycsv("a.csv");
        m.writeCSVFile(header, methods);
}

/**
 * @author pzzhao
 * @version 创建时间：2022-5-8 14:46
 */
public class CsvUtils {

    /**
     * @description: 处理csv文件字段中需要转义的引号
     *               添加双引号，防止被字段中的逗号和换行符干扰
     *               使其显示为一个单元格
     * @param value 待处理的字段值
     * @return: {@link String}
     * @author: pzzhao
     * @date: 2022-05-08 14:49:46
     */
    public static String processValueForCsv(String value) {
        if (value == null) {
            return "";
        }

        if (value.contains("\"")) {
            value = value.replaceAll("\"", "\"\"");
        }
         value = "\"" + value + "\"";

        return value;
    }
}