java 給csv增加一列

/**
 * 讀取CSV檔案內容
 * @param csvFileName
 * @throws IOException
 */
public static void readCSVAndWrite(
        String inputCsvFileName1,
        String outputCsvFileName) throws IOException{
    try {
        // 建立CSV讀物件
        CsvReader csvReader1 = new CsvReader(inputCsvFileName1);
        
 
//CsvReader csvReader2 = new CsvReader(inputCsvFileName2);
        // 讀表頭
        csvReader1.readHeaders();
        //csvReader2.readHeaders();
        
        
        CsvWriter csvWriter1 = new CsvWriter(outputCsvFileName,',', Charset.forName("UTF-8"));
        
        String[] headers2 = {"id","XW1","XW2","XW3","XW4","XW5","XW6","XW7","XW8","GXW1","GXW2","GXW3","GXW4","GXW5","GXW6","GXW7","GXW8","GXW9","GXW10","GXW11","GXW12","GXW13"};
        csvWriter1.writeRecord(headers2);
        
        
        
 
//csvReader1.readRecord();
        int n=1;
        while (csvReader1.readRecord()){
            //System.out.println(csvReader1.getRawRecord());
            
            //System.out.println(csvReader1.getRawRecord());
            
            //for(int k=0;k<list_headers.size();k++) {
            //    String indexHeader = list_headers.get(k);
            
 
//    String cell_value_str = csvReader.get(indexHeader);
            //    cell_value = cell_value+Double.parseDouble(cell_value_str);
            //}
            String[] content2 = new String[headers2.length];
            
            
            content2[0] = n+"";
            
            for(int k=1;k<headers2.length;k++)
            {
                String indexHeader = headers2[k];
                String cell1_value_str = csvReader1.get(indexHeader);
                content2[k] = cell1_value_str;
            }
            
            csvWriter1.writeRecord(content2);
            // 讀一整行
            //System.out.println(csvReader.getRawRecord());
            // 讀這行的某一列
            //System.out.println(csvReader.get("A")+"\t"+csvReader.get("B")+"\t"+csvReader.get("C"));
            
            n++;
        }
        
        csvWriter1.flush();
        csvWriter1.close();
        
        csvReader1.close();
    } catch (IOException e) {
        e.printStackTrace();
    }finally {
        System.out.println("finish...");
    }
}

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