使用Buffer Reader从用户读取多行输入

Question

如何使用缓冲读取器获取两行输入，这些输入数据应以XML元素显示？ 每行的输入用“ : ”分隔的地方

例：

id:streetname:city:state:zipcode:country
121:xxxx:slm:tn:636007:ind
123:yyyy:chn:tn:600009:ind 

我可以通过使用来读取单行输入

String line = buf.readLine();
String[] columns = line.split(":");

并且这些数据在XML中成功填充。
我需要帮助，在XML中填充两行输入。

    public static void main(String args[]) throws IOException{
        DocumentBuilderFactory docFactory =  DocumentBuilderFactory.newInstance();
        docFactory.setNamespaceAware(true);
        DocumentBuilder docBuilder;
        try {
            docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.newDocument();
            Element rootElement = doc.createElementNS("www.DATA.com/XML", "Contact");
            doc.appendChild(rootElement);
            BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
            System.out.println("Enter details of shipments:");
            String line=buf.readLine();
            String[] columns = line.split(":");
            String id = columns[0];
            String street = columns[1];
            String city = columns[2];
            String state = columns[3];
            String zipcode = columns[4];
            String country = columns[5];

            // create a book object from the data in the columns
            trial p = new trial(id, street, city,state,zipcode,country);

            // close the input stream
            buf.close();
            //append first child element to root element
            rootElement.appendChild(getShipmentDetails(doc, id,street, city,state,zipcode,country));

            // write the content into xml file
            TransformerFactory transformerFactory = TransformerFactory.newInstance();
            Transformer transformer = transformerFactory.newTransformer();
            DOMSource source = new DOMSource(doc);
            StreamResult result = new StreamResult(new File("ContactDetails.xml"));
            transformer.transform(source, result);

            // Output to console for testing
            StreamResult consoleResult = new StreamResult(System.out);
            transformer.transform(source, consoleResult);
            System.out.println("");
            System.out.println("XML file saved");
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private static Node getShipmentDetails(Document doc, String id, String street, String city, String state, String zipcode, String country  ) 
    {
        Element address = doc.createElement("address");

        //set id attribute
        address.setAttribute("addressId", id);

        //create street element
        address.appendChild(getShipmentElements(doc, address, "street", street));

        //create city element
        address.appendChild(getShipmentElements(doc, address, "city", city));

        //create state element
        address.appendChild(getShipmentElements(doc, address, "state", state));

        //create zipcode element
        address.appendChild(getShipmentElements(doc, address, "zipcode", zipcode));

        //create country element
        address.appendChild(getShipmentElements(doc, address, "country", country));

        return address;
    }

//utility method to create text node

    private static Node getShipmentElements(Document doc, Element element, String name, String value) {
        Element node = doc.createElement(name);
        node.appendChild(doc.createTextNode(value));
        return node;
    }
}

预期产量：

<address id="121">
  <street>xxxx</street>
  <city>xxxx</city>
  <state>xxxx</state>
  <zipcode>xxxx</zipcode>
  <country>xxxx</country>
</address>
<address id="123">
  <street>xxxx</street>
  <city>xxxx</city>
  <state>xxxx</state>
  <zipcode>xxxx</zipcode>
  <country>xxxx</country>
</address>

Answer 1

您可以执行以下操作来实现您的目标。 我只发布你说你有困惑的循环部分。 您可以通过在容器中的每个项目和各个容器之间的空格之间放置：来要求用户输入容器项目。

BufferedReader buf = new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter details of shipments with *ONLY ONE* space in between multiple lines. Please separate items in one shipping container with :");
        String line = buf.readLine();

        //First separate out the space.
        String[] columnStrings = line.split(" ");

        for (String columnString : columnStrings) {
            String[] columns = columnString.split(":");
            String id = columns[0];
            String street = columns[1];
            String city = columns[2];
            String state = columns[3];
            String zipcode = columns[4];
            String country = columns[5];
            // close the input stream
            buf.close();
            //append first child element to root element
            rootElement.appendChild(getShipmentDetails(doc, id, street, city, 
state, zipcode, country));
        }

另外，我不知道您为何使用试用声明。 我删除它，程序编译得很好。 您可以遍历每一行并继续在XML中添加更多元素。 上面代码执行后的最终XML是这样的：

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<Contact xmlns="www.DATA.com/XML">
<address addressId="121">
    <street>xxxx</street>
    <city>slm</city>
    <state>tn</state>
    <zipcode>636007</zipcode>
    <country>ind</country>
</address>
<address addressId="123">
    <street>yyyy</street>
    <city>chn</city>
    <state>tn</state>
    <zipcode>600009</zipcode>
    <country>ind</country>
</address>

请尝试一次这个代码然后看看。 谢谢

您不必一次从用户那里获取整个输入，而是可以从用户的每个输入中获取一行。 第一件事是询问用户你可以做的事情的数量

Scanner input = new Scanner(System.in);
System.out.println("Enter number of shipments");
String noOfShipments = input.nextLine();
//NumberUtils class is from apache commons
if(!NumberUtils.isNumber(noOfShipments)) {
    throw new IllegalArgumentException("The number of shipments is supposed to be an integer");
}
int shipmentNo = Integer.parseInt(noOfShipments);
for(int i=0;i<shipmentNo;i++) {
    System.out.println("Enter shipment details for shipment no "+(i+1));
    String shipmentDetail = input.nextLine();  // Read shipment details
    //Do something with this input and keep parsing until the end of the for loop
}