Android中XML文件的序列化生成与解析

首先，我把Person的实体类

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文件的方法例如以下：

/**
     * 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);// 開始文档。參数分别为字符编码和是否保持独立
            serializer.startTag(null, "persons"); // 開始标签,參数分别为：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");// 開始标签
                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：

/**
     * 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");// 參数分别为输入流和字符编码
            int type = parser.getEventType();
            while (type != XmlPullParser.END_DOCUMENT) {// 假设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：

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());
            }
        });
    }
}