PullXml解析Xml文件（一般用于安卓）

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在移动端，对Xml解析一般是使用PullXml解析，其实还有另外两种解析方式，Dom解析和SAX解析，各有优缺点，今天就先介绍Pull解析方式。

要想使用Pull解析，需要先导入jar包：

给出Xml文件如下：

<note>    <to>        小红    </to>    <to>        Allen    </to>    <from>        John    </from>    <heading font="微软雅黑" color="red">        Reminder    </heading>    <body>        <font>宋体五号</font>        <color>绿色</color>        <level>6</level>        <mesage>Don't forget the meeting!</mesage>    </body>    <body>        <font>Source Pro Code</font>        <color>black</color>        <level>1</level>        <message>里约</message>    </body></note>

由上文件，我们可以创建出实体类，用来保存从Xml文件读取到的信息

/** * project pullxmltest * package PACKAGE_NAME * Created by xsm on 2016/8/9. */public class Note {    private List<String> receivers;//用来保存读取到的<to>标签的内容    private String from;    //因为heading标签有属性，所以可以创建一个Heading类来保存其内容和属性值   private Heading heading;    //用来保存读取到的<body>标签，因为<body>里面有子标签，所以需创建一个Body实体类
    private LinkedList<Body> bodies;    public String getFrom() {        return from;    }    public void setFrom(String from) {        this.from = from;    }    public Heading getHeading() {        return heading;    }    public void setHeading(Heading heading) {        this.heading = heading;    }    public LinkedList<Body> getBodies() {        return bodies;    }    public void setBodies(LinkedList<Body> bodies) {        this.bodies = bodies;    }    public List<String> getReceivers() {        return receivers;    }    public void setReceivers(List<String> receivers) {        this.receivers = receivers;    }    @Override    public String toString() {        return "Note{" +                "receivers=" + receivers +                ", from='" + from + '\'' +                ", heading=" + heading +                ", body='" + bodies + '\'' +                '}';    }}

Heading实体类和Body实体类如下：

/** * project pullxmltest * package PACKAGE_NAME * Created by xsm on 2016/8/9. */public class Heading {    private String font;    private String color;    private String text;    public String getFont() {        return font;    }    public void setFont(String font) {        this.font = font;    }    public String getColor() {        return color;    }    public void setColor(String color) {        this.color = color;    }    public String getText() {        return text;    }    public void setText(String text) {        this.text = text;    }    @Override    public String toString() {        return "Heading{" +                "font='" + font + '\'' +                ", color='" + color + '\'' +                ", text='" + text + '\'' +                '}';    }}

/** * project pullxmltest * package PACKAGE_NAME * Created by xsm on 2016/8/9. */public class Body {    private String font;    private String color;    private int level;    private String message;    public String getFont() {        return font;    }    public void setFont(String font) {        this.font = font;    }    public String getColor() {        return color;    }    public void setColor(String color) {        this.color = color;    }    public int getLevel() {        return level;    }    public void setLevel(int level) {        this.level = level;    }    public String getMessage() {        return message;    }    public void setMessage(String message) {        this.message = message;    }    @Override    public String toString() {        return "Body{" +                "font='" + font + '\'' +                ", color='" + color + '\'' +                ", level=" + level +                ", message='" + message + '\'' +                '}';    }}

解析方式如下：

import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.IOException;import java.util.ArrayList;import java.util.LinkedList;/** * project pullxmltest * package PACKAGE_NAME * Created by xsm on 2016/8/9. */public class Test01 {    public static void main(String[] args) {        String src = "<note>\n" +                "    <to>\n" +                "        小红\n" +                "    </to>\n" +                "    <to>\n" +                "        Allen\n" +                "    </to>\n" +                "    <from>\n" +                "        John\n" +                "    </from>\n" +                "    <heading font=\"微软雅黑\" color=\"red\">\n" +                "        Reminder\n" +                "    </heading>\n" +                "    <body>\n" +                "        <font>宋体五号</font>\n" +                "        <color>绿色</color>\n" +                "        <level>6</level>\n" +                "        <mesage>Don't forget the meeting!</mesage>\n" +                "    </body>\n" +                "    <body>\n" +                "        <font>Source Pro Code</font>\n" +                "        <color>black</color>\n" +                "        <level>1</level>\n" +                "        <message>里约</message>\n" +                "    </body>\n" +                "</note>";        try {            XmlPullParserFactory factory = XmlPullParserFactory.newInstance();            XmlPullParser parser = factory.newPullParser();            parser.setInput(new FileInputStream("res/test.xml"),"UTF-8");//给出Xml文件的地址，并指定编码            Note note = new Note();            note.setReceivers(new ArrayList<String>());            note.setBodies(new LinkedList<Body>());            int type;            while ((type = parser.next()) != XmlPullParser.END_DOCUMENT) {                switch (type) {                    case XmlPullParser.START_DOCUMENT:                        System.out.println("文档开始");                        break;                    case XmlPullParser.START_TAG:                        switch (parser.getName()){                            case "to":                                note.getReceivers().add(parser.nextText().trim());                                break;                            case "from":                                note.setFrom(parser.nextText());                                break;                            case "heading":                                Heading heading = new Heading();                                heading.setFont(parser.getAttributeValue(null,"font"));                                heading.setColor(parser.getAttributeValue(null,"color"));                                heading.setText(parser.nextText());                                note.setHeading(heading);                                break;                            case "body":                                note.getBodies().add(new Body());                                break;                            case "font":                                note.getBodies().getLast().setFont(parser.nextText().trim());                                break;                            case "color":                                note.getBodies().getLast().setColor(parser.nextText().trim());                                break;                            case "level":                                note.getBodies().getLast().setLevel(Integer.parseInt(parser.nextText().trim()));                                break;                            case "message":                                note.getBodies().getLast().setMessage(parser.nextText().trim());                                break;                    }                        break;                    case XmlPullParser.TEXT:                        break;                    case XmlPullParser.END_TAG:                        System.out.println(parser.getName() + "标签结束");                        break;                }            }            System.out.println(note.getReceivers());            System.out.println(note.getBodies());            System.out.println(note.getHeading());        } catch (XmlPullParserException e) {            e.printStackTrace();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}

得到结果如下图：

解析过程中的方法如有不懂可以参考http://www.kxml.org/javadoc/index.html

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