Java 手动解析xml数据

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前言：开发过程中用到极少，不过还是在这做个记录。小伙伴们周末愉快☺。
原文出处：http://blog.csdn.net/u014158743/article/details/52963527

公司里跟服务器基本都是用json数据进行数据交互，用xml的还真是少。不过抱着负责任的态度（- -！），咳咳。。。还是上tomcat吧。用tomcat模拟服务器，在服务器端的MyHttp工程目录下存在person.xml。本地访问服务器得到xml数据后分别进行pull和sax解析。

服务器端的person.xml

<?xml version = "1.0" encoding = "UTF-8"?><persons>    <person id = "23">        <name>张老师</name>        <age>21</age>    </person>    <person id = "20">        <name>李老师</name>        <age>25</age>    </person></persons>

pull解析PullParser.java

public class PullParser {    public List<Person>  parser(String path) throws XmlPullParserException, IOException {        List<Person> list = null;        Person person = null;        XmlPullParserFactory factory = XmlPullParserFactory.newInstance();        XmlPullParser parser = factory.newPullParser();        InputStream in = HttpUtil.getInputStream(path);        parser.setInput(in, "utf-8");        int event = parser.getEventType();        while(event!=XmlPullParser.END_DOCUMENT) {            switch(event) {            case XmlPullParser.START_DOCUMENT:                list = new ArrayList<Person>();break;            case XmlPullParser.START_TAG:                String tagName = parser.getName();                if("person".equals(tagName)) {                    person = new Person();                    int count = parser.getAttributeCount();                    for(int i=0;i<count;i++) {                        String atrrName = parser.getAttributeName(i);                        String attrValue = parser.getAttributeValue(i);                        if("id".equals(atrrName))                            person.setId(attrValue);                    }                } else if("name".equals(tagName)) {                    person.setName(parser.nextText());                } else if("age".equals(tagName)) {                    person.setAge(Integer.parseInt(parser.nextText()));                }                break;            case XmlPullParser.END_TAG:                if("person".equals(parser.getName()))                    list.add(person);                break;            }            event = parser.next();        }        return list;    }}

sax解析MyHandler.java

public class MyHandler extends DefaultHandler {    private List<Person> list;    private Person person;    private String tagName;    @Override    public void startDocument() throws SAXException {        list = new ArrayList<Person>();    }    @Override    public void startElement(String uri, String localName, String qName,            Attributes attributes) throws SAXException {        tagName = qName;        if("person".equals(qName)) {            person = new Person();            for(int i=0;i<attributes.getLength();i++) {                String attrName = attributes.getQName(i);                String attrValue = attributes.getValue(i);                if("id".equals(attrName))                    person.setId(attrValue);            }        }    }    @Override    public void characters(char[] ch, int start, int length)            throws SAXException {        String data = new String(ch,start,length);        if("name".equals(tagName))            person.setName(data);        else if("age".equals(tagName))            person.setAge(Integer.parseInt(data));    }    @Override    public void endElement(String uri, String localName, String qName)            throws SAXException {        tagName = null;        if("person".equals(qName))            list.add(person);    }    @Override    public void endDocument() throws SAXException {    }    public List<Person> getList() {        return list;    } }

本地用来存放数据的实体类Person.java

public class Person {    private String id;    private String name;    private int age;    public Person() {        // TODO Auto-generated constructor stub    }    public Person(String id, String name, int age) {        super();        this.id = id;        this.name = name;        this.age = age;    }    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 int getAge() {        return age;    }    public void setAge(int age) {        this.age = age;    }    @Override    public String toString() {        return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";    }}

访问模拟服务器的工具类HttpUtil.java

public class HttpUtil {    public static InputStream getInputStream(String path) throws IOException {        URL url = new URL(path);        HttpURLConnection conn = (HttpURLConnection) url.openConnection();        conn.setRequestMethod("GET");        conn.setConnectTimeout(5000);        conn.setDoInput(true);        conn.connect();        InputStream in =null;        if(conn.getResponseCode()==200) {            in = conn.getInputStream();        }        return in;    }}

程序入口

最后调用

/**pull*/public static void main(String[] args) throws XmlPullParserException, IOException {    String path = "http://localhost:8080/MyHttp/person.xml";    PullParser parser = new PullParser();    List<Person> list =parser.parser(path);    for(Person person:list) {        System.out.println(person);    }}

/**sax*/public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {    String path = "http://localhost:8080/MyHttp/person.xml";    SAXParserFactory factory = SAXParserFactory.newInstance();    SAXParser parser =factory.newSAXParser();    InputStream in = HttpUtil.getInputStream(path);    MyHandler handler = new MyHandler();    parser.parse(in, handler);    List<Person> list = handler.getList();    for(Person person:list) {        System.out.println(person);    }}

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