文章目录

主类

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package com.carlos.xml;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerConfigurationException;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;

import org.w3c.dom.Document;
import org.w3c.dom.Element;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;

public class MainActivity extends Activity {

private List<UserInfo> infos;
private UserInfo info;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

/**
* 生成List数据给下面生成xml数据使用
*/
crateData();

/**
* 生成xml数据
*/
createXml();

}

void crateData() {
infos = new ArrayList<UserInfo>();
info = new UserInfo();
info.setUsername("Carlos");
info.setAge("21");
infos.add(info);
info = new UserInfo();
info.setUsername("Jack");
info.setAge("19");
infos.add(info);
}

void createXml() {

DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
try {

DocumentBuilder builder = dbf.newDocumentBuilder();
Document document = builder.newDocument();
document.setXmlVersion("1.0");
document.setXmlStandalone(true);
Element root = document.createElement("root");
document.appendChild(root);

for (int i = 0; i < infos.size(); i++) {
info = infos.get(i);
Element userinfo = document.createElement("userinfo");
root.appendChild(userinfo);
Element username = document.createElement("username");
username.appendChild(document.createTextNode(info.getUsername()));
Element age = document.createElement("age");
age.appendChild(document.createTextNode(info.getAge()));
userinfo.appendChild(username);
userinfo.appendChild(age);
}

TransformerFactory tff = TransformerFactory.newInstance();
Transformer tf = tff.newTransformer();
DOMSource domSource = new DOMSource(document);

/**
* 将生成的xml数据转换为字符串用logcat日志0打印出来
*/
ByteArrayOutputStream baos = new ByteArrayOutputStream();
tf.transform(domSource, new StreamResult(baos));
String result = baos.toString();
Log.i("xml", "生成的xml数据为:\n" + result);

/**
* 将生成的xml数据保存为一个文件
*/
File file = new File(Environment.getExternalStorageDirectory(),
"userinfo.xml");
if (!file.exists()) {
file.createNewFile();
Log.i("xml", "该xml文件创建成功,保存在" + file.getAbsolutePath() + "下");
} else {
Log.i("xml", "该xml文件已存在");
}
FileOutputStream fos = new FileOutputStream(file);
StreamResult xmlResult = new StreamResult(fos);
tf.transform(domSource, xmlResult);

baos.close();
fos.close();
} catch (ParserConfigurationException e) {
e.printStackTrace();
} catch (TransformerConfigurationException e) {
e.printStackTrace();
} catch (TransformerException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}

}
}

UserInfo类

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package com.carlos.xml;

public class UserInfo {

private String username;
private String age;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}

}

Logcat结果

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