Question

我编写了一个Java类来生成CSV文件：

public class CSVGenerator {

    private static String REFERRAL_HEADER = "Position,Mail,Invitations,Qualified invitations";
    private static String TOPS_HEADER = "Position,Mail,Number of conferences,Number of new contacts, Average conf duration";

    public static String generate(String source, JsonNode root) throws IOException {
        String result = "";
        CSVWriter writer = new CSVWriter(new FileWriter(source+".csv"));
        if (source.compareTo("referral") == 0)
            result = REFERRAL_HEADER;
        else if (source.compareTo("tops") == 0)
            result = TOPS_HEADER;
        writer.writeNext(result.split(","));
        Iterator<JsonNode> it = root.getElements();
        while (it.hasNext()) {
            Iterator<JsonNode> it2 = it.next().getElements();
            result = "";
            while (it2.hasNext())
            {
                result += it2.next().asText();
                if (it2.hasNext())
                    result += ",";
            }
            writer.writeNext(result.split(","));
        }
        writer.close();
        return result;
    }
}

生成的文件格式不正确。每行只有一个单元格，包含所有单元格和分隔逗号，如下所示：

header1,header2,header3
1,support,test
2,alpha,gamma

我做错了什么？

修改

更准确地说明输出

我有： “头1，标题2，header3”， “” “”

我想： “头1”， “标题2”， “header3”

这是我的输出。一个唯一单元格中的每一行。

   ""Position","Mail","Invitations","Qualified invitations""
    ""1","xxxxx.com","129","23""
    ""2","xxxx.com","54","8""
    ""3","xxxx.com","197","5""
    ""4","xxxx","13","5""
    ""5","xxxx","8","4""
    ""6","xxxx.com","4","4""
    ""7","xxx.com","31","3""
    ""8","xxx.com","30","3""
    ""9","xxx.com","18","3""
    ""10","xxx.com","13","3""

Answer 1

也许这会更好。干杯！

result += \"+data.asText()+\";

Answer 2

您是否尝试在结果属性周围添加引号;

result += "\""+data.asText()+"\"";

请记住，我不熟悉jsondata对象。

此外，你应该逐行编写每一行，而不是在最后添加所有内容。

是的，看看内置的CSVReader和CSVWriter。

Answer 3

尝试在标题字段周围添加引号：

private static String REFERRAL_HEADER = "\"Position\",\"Mail\",\"Invitations\",\"Qualified invitations\"\n";
private static String TOPS_HEADER = "\"Position\",\"Mail\",\"Number of conferences\",\"Number of new contacts\", \"Average conf duration\"\n";

Answer 4

我在一个groovy shell中尝试了你的代码的一部分，我得到了正确的结果：

groovy:000> string = new java.io.StringWriter()
===> 
csv = new CSVWriter(string)
===> au.com.bytecode.opencsv.CSVWriter@4d9ac0b4
groovy:000> csv.writeNext(REFERRAL_HEADER.split(","))
===> null
groovy:000> string.toString()
===> "Position","Mail","Invitations","Qualified invitations"

您可以尝试使用commons-csv代替CSVWriter。该库有点时髦，因为它是根据数据库量身定制的。

写入的CSV文件每行只写一个单元格

4 个答案: