android pull 解析xml方式

标签：webview   base64   class   github   json   

先获取到一个XmlPullParserFactory实例

通过实例得到XmlPullParser对象

调用XmlPullParser的setInput()方法将服务返回的XML数据设置进去开始解析

通过getEventType()可以得到当前的解析事件

While循环不断地进行解析

如果当前的解析事件不等于XmlPullParser.END_DOCUMENT,说明解析工作还没完成,调用next()方法后可以获取下一个解析事件.

在while循环中,我们通过getName()方法得到当前结点的名字,如果发现结点名字等于id…等.就调用nextText()方法来获取结点内具体的内容

   pull是开源的项目 源码下载地址http://www.xmlpull.org/ 

被解析的xml文档和android dom 解析xml方式 中的xml文档一样，命名为pullTest.xml.

package com.jia.networktest;


import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StringReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;


import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserFactory;


import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;


public class MainActivity extends Activity implements OnClickListener {


public static final int SHOW_RESPONSE = 0;
public static final int SHOW_HTTPCLIENT = 1;
private Button send_request;
private TextView responseText;
private Button btn_httpClient;
private Handler handler = new Handler() {
public void handleMessage(Message msg) {
switch (msg.what) {
case SHOW_RESPONSE:
String response = (String) msg.obj;
// 在这里进行UI操作,将结果显示到界面上
responseText.setText(response);
case SHOW_HTTPCLIENT:
String m_httpClient = (String) msg.obj;
// 在这里进行UI操作,将结果显示到界面上
responseText.setText(m_httpClient);
}
}
};


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
send_request = (Button) findViewById(R.id.send_request);
responseText = (TextView) findViewById(R.id.response);
btn_httpClient = (Button) findViewById(R.id.HttpClient);
send_request.setOnClickListener(this);
btn_httpClient.setOnClickListener(this);
}


@Override
public void onClick(View v) {
if (v.getId() == R.id.send_request) {
sendRequestWithHttpURLConnection();
} else if (v.getId() == R.id.HttpClient) {
sendRequestWithHttpClient();
}


}


private void sendRequestWithHttpClient() {
new Thread(new Runnable() {


@Override
public void run() {
try {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(
"http://192.168.1.88:8080/jia/get_data.txt");
List<NameValuePair> params = new ArrayList<NameValuePair>();
params.add(new BasicNameValuePair("username",
"yao_jiawei@hotmail.com"));
params.add(new BasicNameValuePair("password", "yaowentian"));
UrlEncodedFormEntity urlEncodedFormEntity = new UrlEncodedFormEntity(
params, "utf-8");
httpPost.setEntity(urlEncodedFormEntity);


HttpResponse httpResponse = httpClient.execute(httpPost);
if (httpResponse.getStatusLine().getStatusCode() == 200) {
// 请求和响应都成功了
HttpEntity entity = httpResponse.getEntity();// 获取到一个HttpEntity实例
String response = EntityUtils.toString(entity, "utf-8");// 用EntityUtils.toString()这个方法将HttpEntity转换成字符串
/*
* Message message = new Message(); message.what =
* SHOW_HTTPCLIENT; // 将服务器返回的结果存放到Message中 message.obj
* = response.toString(); handler.sendMessage(message);
*/
parseXMLWithPull(response);
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


}


private void parseXMLWithPull(String xmlData) {
try {
// 创建一个xmlPullParser的工厂
XmlPullParserFactory factory = XmlPullParserFactory
.newInstance();
// 获取一个解析实例
XmlPullParser xmlPullParser = factory.newPullParser();
xmlPullParser.setInput(new StringReader(xmlData));
// 当前事件的类型
int eventType = xmlPullParser.getEventType();
String id = "";
String name = "";
String version = "";
while (eventType != xmlPullParser.END_DOCUMENT) {
// 当前节点的名称
String nodeName = xmlPullParser.getName();
switch (eventType) {
// 开始解析某个结点
case XmlPullParser.START_TAG: {
if ("id".equals(nodeName)) {
id = xmlPullParser.nextText();
} else if ("name".equals(nodeName)) {
name = xmlPullParser.nextText();
} else if ("version".equals(nodeName)) {
version = xmlPullParser.nextText();
}
break;
}// 完成解析某个结点
case XmlPullParser.END_TAG: {
if ("app".equals(nodeName)) {
Log.d("jia", "id is----------------->" + id);
Log.d("jia", "name is--------------->" + name);
Log.d("jia", "version is------------>"
+ version);
}
break;
}
default:
break;
}
eventType = xmlPullParser.next();
}
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


}
}).start();


}


private void sendRequestWithHttpURLConnection() {
// 开启线程来发起网络请求
new Thread(new Runnable() {


@Override
public void run() {
HttpURLConnection connection = null;
try {
URL url = new URL("http://www.baidu.com");
connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("POST");
connection.setConnectTimeout(8000);
connection.setReadTimeout(8000);
DataOutputStream out = new DataOutputStream(connection
.getOutputStream());
out.writeBytes("username=yao_jiawei@hotmail.com&password=yaowentian");
InputStream in = connection.getInputStream();
// 下面对获取到的输入流进行读取
BufferedReader reader = new BufferedReader(
new InputStreamReader(in));
StringBuilder response = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
response.append(line);
}
Message message = new Message();
message.what = SHOW_RESPONSE;
// 将服务器返回的结果存放到message中
message.obj = response.toString();
handler.sendMessage(message);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (connection != null) {
connection.disconnect();
}
}


}
}).start();


}


}

pull和sax不同最主要的体现在pull可以由客户随时终止解析xml.sax解析，只能从文档头一直读到尾，中间不能停止也不能对文件进行修改。直到解析完了整个文档才会返回。

只要满足退出解析的条件，只需要设置如下代码即可。

完整项目下载：http://download.csdn.net/detail/nxh_love/3978483

android pull 解析xml方式

标签：webview   base64   class   github   json   

原文地址：http://blog.csdn.net/fang323619/article/details/43022543