java读取csv文件的两种方式

java读取csv文件的两种方式

1.CsvReader读取

import com.csvreader.CsvReader;
/**
     * CsvReader 读取
     * @param filePath
     * @return
     */
    public static ArrayList<String> readCsvByCsvReader(String filePath) {
          
   
        ArrayList<String> strList = null;
        try {
          
   
            ArrayList<String[]> arrList = new ArrayList<String[]>();
            strList = new ArrayList<String>();
            CsvReader reader = new CsvReader(filePath, ,, Charset.forName("UTF-8"));
            while (reader.readRecord()) {
          
   
//                System.out.println(Arrays.asList(reader.getValues()));
                arrList.add(reader.getValues()); // 按行读取，并把每一行的数据添加到list集合
            }
            reader.close();
            System.out.println("读取的行数：" + arrList.size());
            // 如果要返回 String[] 类型的 list 集合，则直接返回 arrList
            // 以下步骤是把 String[] 类型的 list 集合转化为 String 类型的 list 集合
            for (int row = 0; row < arrList.size(); row++) {
          
   
                // 组装String字符串
                // 如果不知道有多少列，则可再加一个循环
                String ele = arrList.get(row)[0] + "," + arrList.get(row)[1] + ","
                        + arrList.get(row)[2] + "," + arrList.get(row)[3] ;
				System.out.println(ele);
                strList.add(ele);

            }
        } catch (Exception e) {
          
   
            e.printStackTrace();
        }
        return strList;
    }

CsvReader方式需要引入jar包，pom配置如下

<!--csv文件操作-->
        <dependency>
            <groupId>net.sourceforge.javacsv</groupId>
            <artifactId>javacsv</artifactId>
            <version>2.0</version>
        </dependency>

2.BufferedReader读取

/**
     * BufferedReader 读取
     * @param filePath
     * @return
     */
    public static ArrayList<String> readCsvByBufferedReader(String filePath) {
          
   
        File csv = new File(filePath);
        csv.setReadable(true);
        csv.setWritable(true);
        InputStreamReader isr = null;
        BufferedReader br = null;
        try {
          
   
            isr = new InputStreamReader(new FileInputStream(csv), "UTF-8");
            br = new BufferedReader(isr);
        } catch (Exception e) {
          
   
            e.printStackTrace();
        }
        String line = "";
        ArrayList<String> records = new ArrayList<>();
        try {
          
   
            while ((line = br.readLine()) != null) {
          
   
                System.out.println(line);
                records.add(line);
            }
            System.out.println("csv表格读取行数：" + records.size());
        } catch (IOException e) {
          
   
            e.printStackTrace();
        }
        return records;
    }