使用 Java 将 CSV 文件转换为 XML 文件

Question

我正在尝试编写一个 java 程序，它将读取不同巴士站信息的 csv 文件并将它们转换为 xml 文件并保存为新的 xml 文件。我从朋友那里得到了一些代码的帮助，但我无法理解问题出在哪里，因为他们忘记将 cmets 包含在代码中。任何修复代码的帮助将不胜感激。代码如下所示。

public class converter {
protected DocumentBuilderFactory domFactory = null;
protected DocumentBuilder domBuilder = null;

public static void main(String[] args) {



    ArrayList<String> busStopInfo = new ArrayList<String>(7);

    File file = new File("stops.csv");
    BufferedReader readFile = null;
    try {
        DocumentBuilderFactory df = DocumentBuilderFactory.newInstance();
        DocumentBuilder db = df.newDocumentBuilder();

        Document document = db.newDocument();

        Element rootElement = document.createElement("BusStops");

        document.appendChild(rootElement);
        readFile = new BufferedReader(new FileReader(file));
        int line = 0;

        String information = null;
        while ((information = readFile.readLine()) != null) {

            String[] rowValues = information.split(",");

            if (line == 0) {
                for (String columnInfo : rowValues) {
                    busStopInfo.add(columnInfo);
                }
            } else {
                Element childElement = document.createElement("details");
                rootElement.appendChild(childElement);


                for (int columnInfo = 0; columnInfo < busStopInfo.size(); columnInfo++) {

                    String header = busStopInfo.get(columnInfo);
                    String value = null;

                    if (columnInfo < rowValues.length) {
                        value = rowValues[columnInfo];
                    } else {
                        value = " ";
                    }

                    Element current = document.createElement(header);
                    current.appendChild(document.createTextNode(value));
                    childElement.appendChild(current);
                    System.out.println(value);
                }
            }
            line++;
        }
    Transformer tf = TransformerFactory.newInstance().newTransformer();
tf.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
tf.setOutputProperty(OutputKeys.INDENT, "yes");
Writer output = new StringWriter();
tf.transform(new DOMSource(document), new StreamResult(output));
System.out.println(output.toString());
} catch (Exception e) {

    }
} 

}

下面是csv文件的摘录

AtcoCode、CommonName、LocalityName、ParentLocalityName、纬度、经度 0100BRP90336,The Centre,Bristol City Centre,布里斯托,51.4543379612,-2.5978824115 0170SGA56570,UWE Entrance North,Abbey Wood,,51.50419145,-2.549547265 079073001Z,Bus Station Express Lounge,Middlesbrough,,54.5760020508,-1.2391798779 0800COC31523,Bus Station,Newquay,,50.4130339395,-5.0856695446 0800COC56586,Bus Station,Camborne,,50.2132677521,-5.2974299693

这是我要复制的 xml 文件的架构

<xs:element name="Busstops">

    <xs:element name="stops" minOccurs="1" maxOccurs="unbounded">
        <xs:complexType>
            <xs:sequence>
            <xs:element name="AtcoCode" type="xs:string" minOccurs="1" maxOccurs="1"/>
            <xs:element name="CommonName" type="xs:string" "minOccurs="1" maxOccurs="1"/>
            <xs:element name="LocalityName" type="xs:string" "minOccurs="1" maxOccurs="1"/>
            <xs:element name="ParentLocalityName" type="xs:string" "minOccurs="0" maxOccurs="1"/>
            <xs:element name="Longitude" type="xs:string" "minOccurs="1" maxOccurs="1"/>
            <xs:element name="Latitude" type="xs:string" "minOccurs="1" maxOccurs="1"/>
            </xs:sequence>
        </xs:complexType>
    </xs:element>
</xs:sequence>

Answer 1

此代码正在生成一个输出，将读取的 .csv 转换为 XML 文档（显示在标准输出上）。

根据提供的 .csv 摘录，代码运行良好，并在标准输出上生成 xml：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<BusStops>
<details>
<AtcoCode>0100BRP90336</AtcoCode>
<CommonName>The Centre</CommonName>
<LocalityName>Bristol City Centre</LocalityName>
<ParentLocalityName>Bristol</ParentLocalityName>
<Latitude>51.4543379612</Latitude>
<Longitude>-2.5978824115</Longitude>
</details>
...
</BusStops>

如果不想将其显示在标准输出上而是将其写入文件，您可以简单地将标准输出重定向到文件（最简单的方法）。

否则，将System.out.println(output.toString()) 更改为写入文件。比如：

PrintWriter writer = new PrintWriter("the-file-name.xml", "UTF-8");
writer.println(output.toString());
writer.close();

会起作用的。