Question

我有一个简单的xml字符串

public class ExamSubjectsActivity extends BaseActivity {
private ActivityExamsSubjectsBinding binding;

LinearLayout myLayout;
MotionEvent mMotionEvent;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    binding = DataBindingUtil.setContentView(this, R.layout.activity_exams_subjects);
    myLayout = binding.grades;




    myLayout.setOnTouchListener(new OnSwipeTouchListener(this) {
        public void onSwipeTop() {
            Toast.makeText(ExamSubjectsActivity.this, "top", Toast.LENGTH_SHORT).show();

        }
        public void onSwipeRight() {
            Toast.makeText(ExamSubjectsActivity.this, "right", Toast.LENGTH_SHORT).show();
            for (int i = 0; i < myLayout.getChildCount(); i++) {

                View view = myLayout.getChildAt(i);
                Rect outRect = new Rect(view.getLeft(), view.getTop(), view.getRight(), view.getBottom());
                if (outRect.contains((int) mMotionEvent.getX(), (int) mMotionEvent.getY())) {
                    view.setBackgroundColor(ContextCompat.getColor(ExamSubjectsActivity.this, R.color.prime_orange));
                }

            }
        }
        public void onSwipeLeft() {
            Toast.makeText(ExamSubjectsActivity.this, "left", Toast.LENGTH_SHORT).show();
            for (int i = 0; i < myLayout.getChildCount(); i++) {

                View view = myLayout.getChildAt(i);
                Rect outRect = new Rect(view.getLeft(), view.getTop(), view.getRight(), view.getBottom());
                if (outRect.contains((int) mMotionEvent.getX(), (int) mMotionEvent.getY())) {
                    view.setBackgroundColor(ContextCompat.getColor(ExamSubjectsActivity.this, R.color.white));
                }

            }
        }
        public void onSwipeBottom() {
            Toast.makeText(ExamSubjectsActivity.this, "bottom", Toast.LENGTH_SHORT).show();
        }

        public boolean onTouch(View v, MotionEvent event) {

            return gestureDetector.onTouchEvent(event);
        }
    });


}

如果没有xmlns =“”，我可以获取值，但是当xmlns属性出现时，它不返回值

这是我的代码

<Detail>
    <firstname xmlns=""></firstname >
    <lastname xmlns=""></lastname>               
</Detail>

我如何获得名字值。我不想将DocumentBuilder类用于这个单个元素

Answer 1

我认为最简单的方法是在没有显式解析XML文本的情况下使用JAXB，如下所示。创建一个Detail类，该类仅注释要从输入XML加载的变量。

对于 input.xml 文件，该文件不仅包含firstname和lastname，还包含其他XML元素（如注释中所请求的）：

<?xml version="1.0" encoding="UTF-8"?>
<Detail>
    <firstname>firstname</firstname>
    <lastname>lastname</lastname>               
    <elementA>element A</elementA>
    <elementB>element B</elementB>
    <elementC>element C</elementC>
</Detail>

如果你有一个详细信息类，只注释了firstname和lastname，如下所示：

package test;

import javax.xml.bind.annotation.XmlAccessType;
import javax.xml.bind.annotation.XmlAccessorType;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlAccessorType(XmlAccessType.NONE)
@XmlRootElement(name = "Detail")
@XmlType(propOrder = { "firstname", "lastname"})
public class Detail {

    @XmlElement(name="firstname")
    private String firstname;

    @XmlElement(name="lastname")
    private String lastname;

    private String elementA = "default elementA";

    private String elementB = "default elementB";

    private String elementC = "default elementC";

    public Detail(){}

    public String getFirstname() {
        return firstname;
    }

    public void setFirstname(String firstname) {
        this.firstname = firstname;
    }

    public String getLastname() {
        return lastname;
    }

    public void setLastname(String lastname) {
        this.lastname = lastname;
    }

    public String getElementA() {
        return elementA;
    }

    public void setElementA(String elementA) {
        this.elementA = elementA;
    }

    public String getElementB() {
        return elementB;
    }

    public void setElementB(String elementB) {
        this.elementB = elementB;
    }

    public String getElementC() {
        return elementC;
    }

    public void setElementC(String elementC) {
        this.elementC = elementC;
    }
}

以及 jaxb.index 文件，与编译类位于同一文件夹中，其唯一内容为：

Detail

您测试输入XML ，如下所示：

import java.io.File;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Unmarshaller;

public class Test {

    public static void main(String[] args) {
        try{
            JAXBContext jc = JAXBContext.newInstance(Detail.class);

            Unmarshaller unmarshaller = jc.createUnmarshaller();
            File xml = new File("input.xml");
            Detail detail = (Detail) unmarshaller.unmarshal(xml);
            System.out.println("Detail firstname:"+detail.getFirstname()+" lastname:"+detail.getLastname());
        }
        catch(JAXBException e){
            System.out.println(e.getMessage());
        }
    }
}

您将看到Detail仅从XML文件加载了firstname和lastname。

无法在Java中获取XML标记值

1 个答案: