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Java调用XML的方法:DocumentBuilderFactory

首先得到:得到 DOM 解析器的工厂实例      DocumentBuilderFactory domfac=DocumentBuilderFactory.newInstance();

然后从 DOM 工厂获得 DOM 解析器

 DocumentBuilder dombuilder=domfac.newDocumentBuilder();

 

3 )把要解析的 XML 文档转化为输入流,以便 DOM 解析器解析它

InputStream is= new  FileInputStream("test1.xml");        

( 4 )解析 XML 文档的输入流,得到一个 Document

 Document doc=dombuilder.parse(is);

( 5 )得到 XML 文档的根节点

Element root=doc.getDocumentElement();

( 6 )得到节点的子节点

  NodeList books=root.getChildNodes();

package com.st.demo;   
  
import java.io.File;   
import java.io.FileInputStream;   
import java.io.InputStream;   
  
import javax.xml.parsers.DocumentBuilder;   
import javax.xml.parsers.DocumentBuilderFactory;   
  
import org.w3c.dom.Document;   
import org.w3c.dom.Element;   
import org.w3c.dom.Node;   
import org.w3c.dom.NodeList;   
  
public class XmlReader {   
    public static void main(String[] args) {   
        XmlReader reader = new XmlReader();   
    }   
    public XmlReader(){   
        DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();   
        try {   
            DocumentBuilder domBuilder = domfac.newDocumentBuilder();   
            InputStream is = new FileInputStream(new File("D:/test1.xml"));   
            Document doc = domBuilder.parse(is);   
            Element root = doc.getDocumentElement();   
            NodeList books = root.getChildNodes();   
            if(books!=null){   
                for (int i = 0; i < books.getLength(); i++) {   
                    Node book = books.item(i);   
                     if(book.getNodeType()==Node.ELEMENT_NODE) {   
                            //(7)取得节点的属性值   
                            String email=book.getAttributes().getNamedItem("email").getNodeValue();   
                            System.out.println(email);   
                            //注意,节点的属性也是它的子节点。它的节点类型也是Node.ELEMENT_NODE   
                            //(8)轮循子节点   
                            for(Node node=book.getFirstChild();node!=null;node=node.getNextSibling()) {   
                                if(node.getNodeType()==Node.ELEMENT_NODE) {   
                                    if(node.getNodeName().equals("name")) {   
                                        String name=node.getNodeValue();   
                                        String name1=node.getFirstChild().getNodeValue();   
                                        System.out.println(name);   
                                        System.out.println(name1);   
                                    }   
                                    if(node.getNodeName().equals("price")) {   
                                        String price=node.getFirstChild().getNodeValue();   
                                        System.out.println(price);   
                                    }   
                                }   
                            }   
                     }   
                }   
            }   
        } catch (Exception e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }   
           
    }   
}  

  

 

XML:

<?xml version="1.0" encoding="GB2312" standalone="no"?>  
<books>  
    <book email="zhoujunhui">  
        <name>rjzjh</name>  
        <price>jjjjjj</price>  
    </book>  
</books>  

 

posted on 2017-11-29 10:24  nickTimer  阅读(435)  评论(0编辑  收藏  举报