把界面内容解析成XML（用DOM模式）

  1 package com.example.androidfilestream04;
  2 
  3 import java.io.File;
  4 import java.io.StringWriter;
  5 
  6 import javax.xml.parsers.DocumentBuilder;
  7 import javax.xml.parsers.DocumentBuilderFactory;
  8 import javax.xml.parsers.ParserConfigurationException;
  9 import javax.xml.transform.OutputKeys;
 10 import javax.xml.transform.Result;
 11 import javax.xml.transform.Source;
 12 import javax.xml.transform.Transformer;
 13 import javax.xml.transform.TransformerConfigurationException;
 14 import javax.xml.transform.TransformerException;
 15 import javax.xml.transform.TransformerFactory;
 16 import javax.xml.transform.dom.DOMSource;
 17 import javax.xml.transform.stream.StreamResult;
 18 
 19 import org.w3c.dom.Document;
 20 import org.w3c.dom.Element;
 21 
 22 import android.os.Bundle;
 23 import android.os.Environment;
 24 
 25 import android.app.Activity;
 26 import android.view.Menu;
 27 import android.view.View;
 28 import android.view.View.OnClickListener;
 29 import android.widget.Button;
 30 import android.widget.EditText;
 31 
 32 public class MainActivity extends Activity {
 33     private EditText name;
 34     private EditText email;
 35     private Button but = null;
 36 
 37     @Override
 38     protected void onCreate(Bundle savedInstanceState) {
 39         super.onCreate(savedInstanceState);
 40         setContentView(R.layout.activity_main);
 41         this.name = (EditText) super.findViewById(R.id.name);
 42         this.email = (EditText) super.findViewById(R.id.email);
 43         this.but = (Button) super.findViewById(R.id.but);
 44         this.but.setOnClickListener(new OnClickListenerImpl());
 45     }
 46 
 47     private class OnClickListenerImpl implements OnClickListener {
 48 
 49         @Override
 50         public void onClick(View v) {
 51             if (!Environment.MEDIA_MOUNTED.equals(Environment
 52                     .getExternalStorageState())) {
 53                 return;
 54             }
 55             // 文件存在地址
 56             File file = new File(Environment.getExternalStorageDirectory()
 57                     + File.separator + "neusoft" + File.separator
 58                     + "member1.xml");
 59             // 判断路径是否不存在，若不存在则创建
 60             if (!file.getParentFile().exists()) {
 61                 file.getParentFile().mkdirs();
 62             }
 63             // 获得dom解析器工厂（工作的作用是用于创建具体的解析器）
 64             DocumentBuilderFactory factory = DocumentBuilderFactory
 65                     .newInstance();
 66             DocumentBuilder builder = null;
 67             try {
 68                 // 获得具体的dom解析器
 69                 builder = factory.newDocumentBuilder();
 70             } catch (ParserConfigurationException e) {
 71                 // TODO Auto-generated catch block
 72                 e.printStackTrace();
 73             }
 74             Document doc = null;
 75             doc = builder.newDocument();// 创建一个新的文档
 76             Element addresslist = doc.createElement("addresslist");
 77             Element linkman = doc.createElement("linkman");
 78             Element name = doc.createElement("name");
 79             Element email = doc.createElement("email");
 80             // 设置标签显示的内容
 81             name.appendChild(doc.createTextNode(MainActivity.this.name
 82                     .getText().toString()));
 83             email.appendChild(doc.createTextNode(MainActivity.this.email
 84                     .getText().toString()));
 85 
 86             // 设置标签之间的关系
 87             linkman.appendChild(name);
 88             linkman.appendChild(email);
 89             addresslist.appendChild(linkman);
 90             // 最后放入文档
 91             doc.appendChild(addresslist);
 92 
 93             // 取得TransformerFactory实例
 94             TransformerFactory tf = TransformerFactory.newInstance();
 95             Transformer t = null;
 96 
 97             try {
 98                 // 从transFactory获取Transformer实例
 99                 t = tf.newTransformer();
100             } catch (TransformerConfigurationException e) {
101                 // TODO Auto-generated catch block
102                 e.printStackTrace();
103             }
104             t.setOutputProperty(OutputKeys.ENCODING, "utf-8");
105             DOMSource source = new DOMSource(doc);// 输出文档
106             StreamResult result = new StreamResult(file);// 指定输出位置
107             try {
108                 t.transform(source, result);// 输出
109             } catch (TransformerException e) {
110                 // TODO Auto-generated catch block
111                 e.printStackTrace();
112             }
113 
114         }
115 
116     }
117 
118 }