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如何在Java中读取包含多组元素且没有属性值的XML文件？

java xml

如何在Java中读取包含多组元素且没有属性值的XML文件？,java,xml,xml-parsing,Java,Xml,Xml Parsing,我主要想知道如何从xml中获取这些元素值 java中的文件将其设置到对象中 下面是示例XML文件 <?xml version="1.0" encoding="UTF-8"?> <Response> <LoanApplication> <LoanId>1111</LoanId> <LoanStatus>Unsuccessful</LoanStatus> <LoanRe

我主要想知道如何从xml中获取这些元素值 java中的文件将其设置到对象中

下面是示例XML文件

<?xml version="1.0" encoding="UTF-8"?>
<Response>
   <LoanApplication>
      <LoanId>1111</LoanId>
      <LoanStatus>Unsuccessful</LoanStatus>
      <LoanReference>111</LoanReference>
   </LoanApplication>
   <LoanApplication>
      <LoanId>222</LoanId>
      <LoanStatus>Unsuccessful</LoanStatus>
      <LoanReference>333</LoanReference>
   </LoanApplication>
   <LoanApplication>
      <LoanId>222</LoanId>
      <LoanStatus>Unsuccessful</LoanStatus>
      <LoanReference>4444</LoanReference>
   </LoanApplication>
   <LoanApplication>
      <LoanId>555</LoanId>
      <LoanStatus>Current</LoanStatus>
      <LoanReference>7777</LoanReference>
   </LoanApplication>
   <LoanApplication>
      <LoanId>3333</LoanId>
      <LoanStatus>Current</LoanStatus>
      <LoanReference>9999</LoanReference>
   </LoanApplication>
</Response>
下面是解析xml文件的方法。现在，我被如何安排我的班主任所打动

 public Set<LoanIDResponse> getLoanIDList()
    {
        Set<LoanIDResponse> loanIDSet = new HashSet<>();
        try
        {

            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(new File("Response.xml"));

            doc.getDocumentElement().normalize();
            NodeList listOfLoanApplication = doc.getElementsByTagName("LoanApplication");
            int totalLoanApplication = listOfLoanApplication.getLength();


            for (int s = 0; s < listOfLoanApplication.getLength(); s++)
            {

                Node loanApplicationNode = listOfLoanApplication.item(s);
                if (loanApplicationNode.getNodeType() == Node.ELEMENT_NODE)
                {
                    LoanIDResponse response = new LoanIDResponse();
                    Element loanApplicationElement = (Element) loanApplicationNode;

                    NodeList loanIDList = loanApplicationElement.getElementsByTagName("LoanId");

                    NodeList loanReferenceList = loanApplicationElement.getElementsByTagName("LoanReference");

                    NodeList loanStatusList = loanApplicationElement.getElementsByTagName("LoanStatus");

                }

            }

        } catch (SAXParseException err)
        {
            LOGGER.log(Level.WARNING, "** Parsing error" + ", line {0}, uri {1}", new Object[]
            {
                err.getLineNumber(), err.getSystemId()
            });
            LOGGER.log(Level.WARNING, " {0}", err.getMessage());

        }
        return loanIDSet;
    }

public Set getLoanIDList（）
{
Set loanIDSet=新HashSet（）；
尝试
{
DocumentBuilderFactory docBuilderFactory=DocumentBuilderFactory.newInstance（）；
DocumentBuilder docBuilder=docBuilderFactory.newDocumentBuilder（）；
documentdoc=docBuilder.parse（新文件（“Response.xml”）；
doc.getDocumentElement（）.normalize（）；
NodeList ListofLanaApplication=doc.getElementsByTagName（“LoanApplication”）；
int totaloanapplication=listofLanapplication.getLength（）；
for（int s=0；s
首先查看和了解更多详细信息

这个例子适用于JAXB

首先，您需要一些类来保存数据

贷款申请 这是贷款申请的基本属性

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "LoanApplication")
public class LoanApplication {
    private long loanId;
    private String loanStatus;
    private long loadReference;

    public long getLoanId() {
        return loanId;
    }

    public String getLoanStatus() {
        return loanStatus;
    }

    public long getLoadReference() {
        return loadReference;
    }

    @XmlElement(name="LoanId")
    public void setLoanId(long loanId) {
        this.loanId = loanId;
    }

    @XmlElement(name="LoanStatus")
    public void setLoanStatus(String loanStatus) {
        this.loanStatus = loanStatus;
    }

    @XmlElement(name="LoanReference")
    public void setLoadReference(long loadReference) {
        this.loadReference = loadReference;
    }

    @Override
    public String toString() {
        return getLoanId() + "; " + getLoanStatus() + "; " + getLoadReference();
    }
}
回答 这是一个“container”类，包含
LoanApplications

import java.util.List;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement(name = "Response")
public class Response {

    private List<LoanApplication> applications;

    @XmlElement(name="LoanApplication")
    public void setApplications(List<LoanApplication> applications) {
        this.applications = applications;
    }

    public List<LoanApplication> getApplications() {
        return applications;
    }

}
基于我的示例代码，输出

1111; Unsuccessful; 111
222; Unsuccessful; 333
222; Unsuccessful; 4444
555; Current; 7777
3333; Current; 9999
写 写作和阅读差不多，事实上，在这个例子中，它也包括阅读部分，所以我们可以更新内容

try {
    File file = new File("Responses.xml");
    JAXBContext jaxbContext = JAXBContext.newInstance(Response.class);

    Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller();
    Response response = (Response) jaxbUnmarshaller.unmarshal(file);
    for (LoanApplication app : response.getApplications()) {
        System.out.println(app);
    }

    LoanApplication app = new LoanApplication();
    app.setLoadReference(123456);
    app.setLoanId(7890);
    app.setLoanStatus("Approved");
    response.getApplications().add(app);

    Marshaller jaxbMarshaller = jaxbContext.createMarshaller();

    jaxbMarshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);
    jaxbMarshaller.marshal(response, new File("Responses.xml"));
    //jaxbMarshaller.marshal(response, System.out);
} catch (JAXBException ex) {
    ex.printStackTrace();
}
这就产生了

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Response>
    <LoanApplication>
        <LoanReference>111</LoanReference>
        <LoanId>1111</LoanId>
        <LoanStatus>Unsuccessful</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>333</LoanReference>
        <LoanId>222</LoanId>
        <LoanStatus>Unsuccessful</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>4444</LoanReference>
        <LoanId>222</LoanId>
        <LoanStatus>Unsuccessful</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>7777</LoanReference>
        <LoanId>555</LoanId>
        <LoanStatus>Current</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>9999</LoanReference>
        <LoanId>3333</LoanId>
        <LoanStatus>Current</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>123456</LoanReference>
        <LoanId>7890</LoanId>
        <LoanStatus>Approved</LoanStatus>
    </LoanApplication>
</Response>


111
1111
不成功的
333
222
不成功的
4444
222
不成功的
7777
555
现在的
9999
3333
现在的
123456
7890
经核准的
注意，最后一条记录是新的

我几乎把它一瘸一拐地放在一起，你可以得到节点值，比如

 NodeList loanIDList = loanApplicationElement.getElementsByTagName("LoanId");
 Element loanIDElement = (Element) loanIDList.item(0);

 NodeList textIDList = loanIDElement.getChildNodes();
 response.setLoanID(Integer.parseInt(((Node)textIDList.item(0)).getNodeValue().trim()));

//-------
 NodeList loanReferenceList = loanApplicationElement.getElementsByTagName("LoanReference");
 Element loanReferenceElement = (Element) loanReferenceList.item(0);

 NodeList textLRList = loanReferenceElement.getChildNodes();
 response.setLoanReference(Integer.parseInt(((Node) textLRList.item(0)).getNodeValue().trim()));
//-------
 NodeList loanStatusList = loanApplicationElement.getElementsByTagName("LoanStatus");
 Element loanStatusElement = (Element) loanStatusList.item(0);

 NodeList textLSList = loanStatusElement.getChildNodes();
 response.setLoanStatus(((Node) textLSList.item(0)).getNodeValue().trim());
，请告诉我们您为实现此目标所做的努力，以及您遇到的错误。StackOverflow不是填鸭式的。现在你可以看到我的源代码了@Vishrant@Z.U.H您得到的是什么错误/异常。如何从tag@VishrantI am获得节点值，并从答案中获得深刻印象。。。优秀：）@Z.I.J在15分钟的谷歌搜索和黑客攻击中表现不错：我认为这对新开发人员来说并不容易。。感谢分享宝贵的答案和评论。。我能和你交朋友吗？@Z.I.J:）对不起，这是你唯一想去的地方。。我很难过看到你的抱歉..：P 
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<Response>
    <LoanApplication>
        <LoanReference>111</LoanReference>
        <LoanId>1111</LoanId>
        <LoanStatus>Unsuccessful</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>333</LoanReference>
        <LoanId>222</LoanId>
        <LoanStatus>Unsuccessful</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>4444</LoanReference>
        <LoanId>222</LoanId>
        <LoanStatus>Unsuccessful</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>7777</LoanReference>
        <LoanId>555</LoanId>
        <LoanStatus>Current</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>9999</LoanReference>
        <LoanId>3333</LoanId>
        <LoanStatus>Current</LoanStatus>
    </LoanApplication>
    <LoanApplication>
        <LoanReference>123456</LoanReference>
        <LoanId>7890</LoanId>
        <LoanStatus>Approved</LoanStatus>
    </LoanApplication>
</Response>

 NodeList loanIDList = loanApplicationElement.getElementsByTagName("LoanId");
 Element loanIDElement = (Element) loanIDList.item(0);

 NodeList textIDList = loanIDElement.getChildNodes();
 response.setLoanID(Integer.parseInt(((Node)textIDList.item(0)).getNodeValue().trim()));

//-------
 NodeList loanReferenceList = loanApplicationElement.getElementsByTagName("LoanReference");
 Element loanReferenceElement = (Element) loanReferenceList.item(0);

 NodeList textLRList = loanReferenceElement.getChildNodes();
 response.setLoanReference(Integer.parseInt(((Node) textLRList.item(0)).getNodeValue().trim()));
//-------
 NodeList loanStatusList = loanApplicationElement.getElementsByTagName("LoanStatus");
 Element loanStatusElement = (Element) loanStatusList.item(0);

 NodeList textLSList = loanStatusElement.getChildNodes();
 response.setLoanStatus(((Node) textLSList.item(0)).getNodeValue().trim());