xml反射

利用反射来将xml里面的内容添加到对象里面：

自定义一个xml

<?xml version="1.0" encoding="UTF-8"?>

<snm id="asd" name="asdasdas">
    <from>222</from>
    <to>1234</to>
    <context>I Miss You!</context>
    <fromuser>
        <user>时间</user>
        <nums>232152</nums>
    </fromuser>
</snm>

定义一个类：

package xml;

import java.util.Arrays;

public class Student {
private String name;
private String name1;
private String name2;
private String name3;

public String toString() {
    return "Student [name=" + name2 + "]";
}
private  void hello(String hello) {
    System.out.println("HelloWorld");
}
private  void hello1() {
    System.out.println("HelloWorld");
}
private  void hello2() {
    System.out.println("HelloWorld");
}
private  void hello3() {
    System.out.println("HelloWorld");
}
private  void hello4(int[] hello) {
    System.out.println("HelloWorld4444444");
    System.out.println(hello);
    Arrays.sort(hello);
    System.out.println(Arrays.toString(hello));
}



}

获取里面的内容以及各种属性：

package xml;

import java.io.InputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.junit.Test;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class TestXml {
    
    @Test
    public void testXml() throws Exception {
        //解析xml
        DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
        InputStream in = Thread.currentThread().getContextClassLoader().getResourceAsStream("smn.xml");
        System.out.println("in是："+in.hashCode());
        Document parse = builder.parse(in);//1144748368   1050 435 101 550
        //获取父节点
        Element element = parse.getDocumentElement();
        System.out.println(element);
        
        //获取父节点里面的属性
        String string = element.getAttribute("name");
        System.out.println("~~~~~~~~~~~~~~"+string);
        
        //获取父节点
        NodeList childNodes = element.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            //获取所有子节点
            Node item = childNodes.item(i);
            System.out.println("IIIIIIIIIIIIIIIII"+item);
        }
        System.out.println("qqqqqqqqqqq"+childNodes);
        System.out.println(childNodes==element);//true
        System.out.println(childNodes.equals(element));//true
        
        
        String textContent = childNodes.item(1).getTextContent();
        System.out.println("里面的东西"+textContent);
        //获取类的字节码文件
        Class<?> cls=Student.class;
        //获取一个字节码对象
        Object obj=cls.newInstance();
        //获取类的所有字段
        Field[] declaredFields = cls.getDeclaredFields();
        for (Field field : declaredFields) {
            
            System.out.println("字段"+field);
            //可以给字段赋值
            if(field.getName().equals("name2")){
                field.setAccessible(true);
                
                field.set(obj, "的风格好久没看，");
            }
        }
        System.out.println("赋值"+obj);
        
        //获取类里面的所有方法
        Method[] declaredMethods = cls.getDeclaredMethods();
        int []array={
            10,5,9,3,20,7    
        };
        for (Method method : declaredMethods) {
            method.setAccessible(true);
            if(method.getName().equals("hello4")){
                //使用类里面的私有方法
                method.invoke(obj,array);
            }
            System.out.println(method);
        }        
    }
/*    static void hello(Node node){
        NodeList childNodes = node.getChildNodes();
        for (int i = 0; i < childNodes.getLength(); i++) {
            System.out.println(childNodes.item(i).getTextContent());
        }
    }*/
}

这样就能将xml里面的属性内容赋值到对象里面了

控制台里面的东西

in是：1144748369
[snm: null]
~~~~~~~~~~~~~~asdasdas
IIIIIIIIIIIIIIIII[#text:
    ]
IIIIIIIIIIIIIIIII[from: null]
IIIIIIIIIIIIIIIII[#text:
    ]
IIIIIIIIIIIIIIIII[to: null]
IIIIIIIIIIIIIIIII[#text:
    ]
IIIIIIIIIIIIIIIII[context: null]
IIIIIIIIIIIIIIIII[#text:
    ]
IIIIIIIIIIIIIIIII[fromuser: null]
IIIIIIIIIIIIIIIII[#text:
]
qqqqqqqqqqq[snm: null]
true
true
里面的东西222
字段private java.lang.String xml.Student.name
字段private java.lang.String xml.Student.name1
字段private java.lang.String xml.Student.name2
字段private java.lang.String xml.Student.name3
赋值Student [name=的风格好久没看，]
public java.lang.String xml.Student.toString()
HelloWorld4444444
[I@69663380
[3, 5, 7, 9, 10, 20]
private void xml.Student.hello4(int[])
private void xml.Student.hello(java.lang.String)
private void xml.Student.hello1()
private void xml.Student.hello3()
private void xml.Student.hello2()