java - XML 解析到 MySQL 数据库

Question

我一直在编写这段代码，将我的 XML 文件解析到 MySQL 数据库中。我在网上看到的每个教程都是单独解析的，就像我一直在研究的这段代码一样。从这里开始，我想以一种方式循环它，而不是单独添加每个字段，如果通过 XML 文件迭代它并定义需要在表内创建多少个字段。有谁知道他们有这样的教程，或者可能有一个简短的例子，我如何开始这样做？示例 我不想每次决定为客户添加另一个特征时都重新编辑我的程序。

package xSQLTEST;

import java.io.*;
import java.sql.*;
import org.w3c.dom.*;
import javax.xml.parsers.*;

public class InsertXMLData {

    public static void main(String[] args) {
        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/brandonDB",
                                                         "root",
                                                         "Absolute!");
            Statement st = con.createStatement();
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(new File("C:\\testXML.xml"));
            doc.getDocumentElement().normalize();
            System.out.println("Root element of the doc is "
                               + doc.getDocumentElement().getNodeName());
            NodeList listOfPersons = doc.getElementsByTagName("row");
            for (int s = 0; s < listOfPersons.getLength(); s++) {
                Node firstPersonNode = listOfPersons.item(s);
                if (firstPersonNode.getNodeType() == Node.ELEMENT_NODE) {
                    Element firstPersonElement = (Element) firstPersonNode;
                    // -------------------------------------------------------------------------------------

                    NodeList CustIdList = firstPersonElement.getElementsByTagName("CustId");
                    Element CustIdElement = (Element) CustIdList.item(0);

                    NodeList textIDList = CustIdElement.getChildNodes();
                    String CustId = ((Node) textIDList.item(0)).getNodeValue()
                                                               .trim();

                    NodeList NameList = firstPersonElement.getElementsByTagName("Name");
                    Element NameElement = (Element) NameList.item(0);

                    NodeList textNMList = NameElement.getChildNodes();
                    String Name = ((Node) textNMList.item(0)).getNodeValue().trim();

                    NodeList CityList = firstPersonElement.getElementsByTagName("City");
                    Element CityElement = (Element) CityList.item(0);

                    NodeList textCTList = CityElement.getChildNodes();
                    String City = ((Node) textCTList.item(0)).getNodeValue().trim();

                    int i = st.executeUpdate("insert into customer(CustId,Name,City) values('"
                                             + CustId
                                             + "','"
                                             + Name
                                             + "','"
                                             + City
                                             + "')");
                }
            }
            System.out.println("Data is successfully inserted!");

        }
        catch (Exception err) {
            System.out.println(" " + err.getMessage());
        }
    }
}

我正在使用的 XML 文件，但希望将来添加有关客户的更多详细信息。

<Customers>
   <row> 
      <CustId>1</CustId>
      <Name>Woodworks</Name>
      <City>Baltimore</City>
   </row>
   <row> 
      <CustId>2</CustId>
      <Name>Software Solutions</Name>
      <City>Boston</City>
   </row>
   <row> 
      <CustId>3</CustId>
      <Name>Food Fantasies</Name>
      <City>New York</City>
   </row>
</Customers>

缓冲区读取器已插入并工作:

BufferedReader br = new BufferedReader(new FileReader(new File("c:\\testXML.xml")));
String line;
StringBuilder sb = new StringBuilder();

while((line=br.readLine())!= null){
    sb.append(line.trim());
}
String strFileContent = sb.toString();

Answer 1

使用 Jsoup，您可以执行以下操作:

private static void parseXml(String xml) {
    Document doc = Jsoup.parse(xml);
    StringBuilder queryBuilder;
    StringBuilder columnNames;
    StringBuilder values;

    for (Element row : doc.select("row")) {   
        // Start the query   
        queryBuilder = new StringBuilder("insert into customer(");
        columnNames = new StringBuilder();
        values = new StringBuilder();

        for (int x = 0; x < row.children().size(); x++) {

            // Append the column name and it's value 
            columnNames.append(row.children().get(x).tagName());
            values.append(row.children().get(x).text());

            if (x != row.children().size() - 1) {
                // If this is not the last item, append a comma
                columnNames.append(",");
                values.append(",");
            }
            else {
                // Otherwise, add the closing paranthesis
                columnNames.append(")");
                values.append(")");
            }                                
        }

        // Add the column names and values to the query
        queryBuilder.append(columnNames);
        queryBuilder.append(" values(");
        queryBuilder.append(values);

        // Print the query
        System.out.println(queryBuilder);
    }
}

输出:

insert into customer(custid,name,city) values(1,Woodworks,Baltimore)
insert into customer(custid,name,city) values(2,Software Solutions,Boston)
insert into customer(custid,name,city) values(3,Food Fantasies,New York)

这允许我们添加任意数量的新列或行。例如，我在您的原始 XML 中添加了一些位，并且在不修改 java 代码的情况下，输出为:

insert into customer(custid,name,city,age) values(1,Woodworks,Baltimore,21)
insert into customer(custid,name,city,age) values(2,Software Solutions,Boston,21)
insert into customer(custid,name,city,age) values(3,Food Fantasies,New York,21)
insert into customer(custid,name,city,age) values(4,Crazy Hat Store,London,21)

编辑:

要从文件导入 XML，方法如下所示:

private static String loadXml(String filePath) {
    try {
        StringBuilder xml = new StringBuilder();
        Scanner scanner = new Scanner(new File(filePath)); // i.e. C:\\testXML.xml

        while (scanner.hasNextLine()) {
            xml.append(scanner.nextLine());
        }
        return xml.toString();
    }
    catch (FileNotFoundException e) {
        e.printStackTrace();
    }
    return null;
}

然后我的主要方法如下所示:

public static void main(String[] args) {
    parseXml(loadXml(filePath));
}