Android中XML文件的序列化生成与解析-优快云博客

首先，我把Person的实体类

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package net.loonggg.test;    
    
public class Person {    
    private int id;    
    private String age;    
    private String name;    
    private String sex;    
    private String address;    
    
    public int getId() {    
        return id;    
    }    
    
    public void setId(int id) {    
        this.id = id;    
    }    
    
    public String getAge() {    
        return age;    
    }    
    
    public void setAge(String age) {    
        this.age = age;    
    }    
    
    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 String getAddress() {    
        return address;    
    }    
    
    public void setAddress(String address) {    
        this.address = address;    
    }    
    
    @Override    
    public String toString() {    
        return "Person [id=" + id + ", age=" + age + ", name=" + name    
                + ", sex=" + sex + ", address=" + address + "]";    
    }    
    
}    

其次：生成xml文件的方法如下：

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/**  
     * 生成xml  
     */    
    private void createXml() {    
        XmlSerializer serializer = Xml.newSerializer();// xml文件生成器    
        File file = new File(Environment.getExternalStorageDirectory(),    
                "person.xml");    
        FileOutputStream fos = null;    
        try {    
            fos = new FileOutputStream(file);    
            serializer.setOutput(fos, "utf-8");// 为xml生成器设置输出流和字符编码    
            serializer.startDocument("utf-8", true);// 开始文档，参数分别为字符编码和是否保持独立    
            serializer.startTag(null, "persons"); // 开始标签,参数分别为：命名空间和标签名    
            for (Person person : list) {    
    
                serializer.startTag(null, "person");    
                serializer.attribute(null, "id", person.getId() + "");    
    
                serializer.startTag(null, "name");// 开始标签    
                serializer.text(person.getName());// 文本内容    
                serializer.endTag(null, "name");// 结束标签    
    
                serializer.startTag(null, "sex");    
                serializer.text(person.getSex());    
                serializer.endTag(null, "sex");    
    
                serializer.startTag(null, "age");    
                serializer.text(person.getAge());    
                serializer.endTag(null, "age");    
    
                serializer.startTag(null, "address");    
                serializer.text(person.getAddress());    
                serializer.endTag(null, "address");    
    
                serializer.endTag(null, "person");    
    
            }    
            serializer.endTag(null, "persons");// 结束标签    
            serializer.endDocument();// 结束xml文档    
            Toast.makeText(getApplicationContext(), "生成成功！", Toast.LENGTH_SHORT);    
        } catch (Exception e) {    
            Toast.makeText(getApplicationContext(), "生成失败！", Toast.LENGTH_SHORT);    
            e.printStackTrace();    
        } finally {    
            try {    
                fos.close();    
            } catch (IOException e) {    
                e.printStackTrace();    
            }    
        }    
    
    }    

然后是解析xml文件的方法：

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/**  
     * 解析xml文件  
     */    
    private List<Person> pullXml() {    
        try {    
            File file = new File(Environment.getExternalStorageDirectory(),    
                    "person.xml");    
            FileInputStream fis = new FileInputStream(file);    
            List<Person> persons = null;    
            Person person = null;    
            XmlPullParser parser = Xml.newPullParser();// 获取xml解析器    
            parser.setInput(fis, "utf-8");// 参数分别为输入流和字符编码    
            int type = parser.getEventType();    
            while (type != XmlPullParser.END_DOCUMENT) {// 如果事件不等于文档结束事件就继续循环    
                switch (type) {    
                case XmlPullParser.START_TAG:    
                    if ("persons".equals(parser.getName())) {    
                        persons = new ArrayList<Person>();    
                    } else if ("person".equals(parser.getName())) {    
                        person = new Person();    
                        String id = parser.getAttributeValue(0);    
                        person.setId(Integer.parseInt(id));    
                    } else if ("name".equals(parser.getName())) {    
                        person.setName(parser.nextText());    
                    } else if ("sex".equals(parser.getName())) {    
                        person.setSex(parser.nextText());    
                    } else if ("address".equals(parser.getName())) {    
                        person.setAddress(parser.nextText());    
                    } else if ("age".equals(parser.getName())) {    
                        person.setAge(parser.nextText());    
                    }    
                    break;    
                case XmlPullParser.END_TAG:    
                    if ("person".equals(parser.getName())) {    
                        persons.add(person);    
                        person = null;    
                    }    
                    break;    
                }    
                type = parser.next();// 继续下一个事件    
            }    
            return persons;    
        } catch (NumberFormatException e) {    
            e.printStackTrace();    
        } catch (FileNotFoundException e) {    
            e.printStackTrace();    
        } catch (XmlPullParserException e) {    
            e.printStackTrace();    
        } catch (IOException e) {    
            e.printStackTrace();    
        }    
        return null;    
    }    

再次是MainActivity里调用的部分代码：

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public class MainActivity extends Activity {    
    private Button btn_create = null;    
    private Button btn_pull = null;    
    private TextView tv_show;    
    private List<Person> list = null;    
    
    @Override    
    protected void onCreate(Bundle savedInstanceState) {    
        super.onCreate(savedInstanceState);    
        setContentView(R.layout.activity_main);    
        btn_create = (Button) findViewById(R.id.createXml);    
        btn_pull = (Button) findViewById(R.id.pullXml);    
        tv_show = (TextView) findViewById(R.id.tvShow);    
        list = new ArrayList<Person>();    
        for (int i = 0; i < 5; i++) {    
            Person person = new Person();    
            person.setAge(i + 20 + "");    
            person.setId(i);    
            person.setName("loonggg" + i);    
            person.setSex("男");    
            person.setAddress("中南海" + i + 1 + "大街");    
            list.add(person);    
        }    
        btn_create.setOnClickListener(new View.OnClickListener() {    
    
            @Override    
            public void onClick(View v) {    
                createXml();    
            }    
        });    
    
        btn_pull.setOnClickListener(new View.OnClickListener() {    
    
            @Override    
            public void onClick(View v) {    
                tv_show.setText(pullXml().toString());    
            }    
        });    
    }    
}    
 