解析XML文档之三：使用DOM解析

dom解析方法是将整个xml文档装载到内存当中，然后通过树形结构方式去解析的，这种方式只适合于在pc端的开发，不是很适合手机端的开发，毕竟来说手机的内存是没法跟pc相提并论的。

具体实现步骤如下：

第一步：准备好解析的xml文档

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

<students>

    <student id="A001">

        <name>zhangsan</name>

        <sex>male</sex>

        <age>12</age>

        <address>beijing</address>

    </student>

    <student id="A002">

        <name>lisi</name>

        <sex>male</sex>

        <age>13</age>

        <address>beijing</address>

    </student>

</students>

第二步：定义一个实体类（这个实体类其实就是xml文档中的内容了）

package com.bjhksj.dom;

public class Student {

    private String id;

    public String getId() {

        return id;

    }

    public void setId(String id) {

        this.id = id;

    }

    public String getName() {

        return name;

    }

    public void setName(String name) {

        this.name = name;

    }

    public String getSex() {

        return sex;

    }

    public void setSex(String sex) {

        this.sex = sex;

    }

    public int getAge() {

        return age;

    }

    public void setAge(int age) {

        this.age = age;

    }

    public String getAddress() {

        return address;

    }

    public void setAddress(String address) {

        this.address = address;

    }

    private String name;

    private String sex;

    private int age;

    private String address;

}

第三步：下载xml文档

package com.bjhksj.dom;

import java.io.InputStream;

import java.net.HttpURLConnection;

import java.net.URL;

public class HttpDownload {

    public static InputStream downloader(String path) {

        InputStream inputStream = null;

        try {

            URL url = new URL(path);

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();

            inputStream = conn.getInputStream();

        } catch (Exception e) {

            // TODO: handle exception

        }

        return inputStream;

    }

}

第四部：解析过程

package com.bjhksj.dom;

import java.io.IOException;

import java.io.InputStream;

import java.util.ArrayList;

import java.util.List;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.NodeList;

public class DomXMLParser {

    public static List<Student> domXMLParser(InputStream inputStream) {

        // 创建一个Document解析器工厂对象

        List<Student> studnetList = new ArrayList<Student>();

        try {

            DocumentBuilderFactory factory = DocumentBuilderFactory

                    .newInstance();

            DocumentBuilder documentBuilder = factory.newDocumentBuilder();

            Document document = documentBuilder.parse(inputStream);

            NodeList studentNodes = document.getElementsByTagName("student");

            for (int i = 0; i < studentNodes.getLength(); i++) {

                Element element = (Element) studentNodes.item(i);

                Student student = new Student();

                student.setId(element.getAttribute("id"));

                NodeList childNodes = element.getChildNodes();

                for (int j = 0; j < childNodes.getLength(); j++) {

                    if ("name".equals(childNodes.item(j).getNodeName())) {

                        student.setName(childNodes.item(j).getFirstChild()

                                .getNodeValue());

                    } else if ("sex".equals(childNodes.item(j).getNodeName())) {

                        student.setSex(childNodes.item(j).getFirstChild()

                                .getNodeValue());

                    } else if ("age".equals(childNodes.item(j).getNodeName())) {

                        student.setAge(Integer.parseInt(childNodes.item(j)

                                .getFirstChild().getNodeValue()));

                    } else if ("address".equals(childNodes.item(j)

                            .getNodeName())) {

                        student.setAddress(childNodes.item(j).getFirstChild()

                                .getNodeValue());

                    }

                }

                studnetList.add(student);

            }

        } catch (Exception e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } finally {

            try {

                inputStream.close();

            } catch (IOException e) {

                // TODO Auto-generated catch block

                e.printStackTrace();

            }

        }

        return studnetList;

    }

}

巴特西

解析XML文档之三：使用DOM解析

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