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获取网络数据，获取web服务器xml数据

2011-12-22 21:39 357 查看

获取网络数据

J2SE实现网络图片的获取

public static void main(String[] args)
throws Exception {
String path = "http://res.img.ifeng.com/2011/1219/xes_bb10a1495fa8e7f76415023d177585d0.jpg";

URL url = new URL(path);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5*1000);
InputStream inStream = conn.getInputStream();

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];

int len=0;
while((len=inStream.read(buffer))!=-1){
outStream.write(buffer,0,len);
}

byte[] data = outStream.toByteArray();

File f = new File("pic.jpg");
FileOutputStream fos = new FileOutputStream(f);
fos.write(data);
fos.close();
}

Androd中获取网络图片

资源

<string name="btn_text">显示网络图片</string>
<string name="error">下载图片失败！！</string>

布局

添加ImageService类

package cn.class3g.service;
…
public class ImageService {
public static byte[] getImage(String path)
throws Exception{
URL url = new URL(path);
//get //post
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5*1000);
InputStream inStream = conn.getInputStream();

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) !=-1 ){
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();//图片的二进制数据
outStream.close();
inStream.close();
return data;
}
}

Activity

public void onClick(View v) {
String path = "http://res.img.ifeng.com/2011/1221/xes_5a3a1d15ffb4b856a02237cdd79d4e41.jpg";

try {
byte[] data = ImageService.getImage(path);

Bitmap bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
imgView.setImageBitmap(bitmap);

} catch (Exception e) {
// e.printStackTrace();
Log.e("TAG", e.toString());
Toast.makeText(this, R.string.error, 1).show();
}
}

Androd中获取网页代码

布局

代码：在前面的ImageService.getImage（）方法基础上修改即可

HtmlService

public class HtmlService {
/**
* 获取给定路径的html代码
* @param path 网页路径
* @return
* @throws Exception
*/
public static String getHtml(String path)
throws Exception{
URL url = new URL(path);
//get //post
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5*1000);
InputStream inStream = conn.getInputStream();

ByteArrayOutputStream outStream = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while( (len = inStream.read(buffer)) !=-1 ){
outStream.write(buffer, 0, len);
}
byte[] data = outStream.toByteArray();//网页的二进制数据
outStream.close();
inStream.close();
return new String(data, "gb2312");
}
}

ShowHtmlActivity

public void onClick(View v) {
String path = pathText.getText().toString();
try {
String htmlcode = HtmlService.getHtml(path);
resultView.setText(htmlcode);
} catch (Exception e) {
Log.e(TAG, e.toString());
Toast.makeText(ShowHtmlActivity.this, R.string.error, 1).show();

}
}

获取web服务器xml数据

资源

<resources>
<string name="app_name">视频资讯客户端</string>
<string name="error">网络连接失败</string>
</resources>

布局

main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<ListView
android:id="@+id/listView"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />

</LinearLayout>

item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<TextView
android:id="@+id/title"
android:layout_width="250dip"
android:layout_height="wrap_content" />

<TextView
android:id="@+id/timelength"
android:layout_width="fill_parent"
android:layout_height="wrap_content" />

</LinearLayout>

添加业务bean类Video

package cn.class3g.domain;

public class Video {
private Integer id;
private String title;
private Integer timelength;

public Video(Integer id, String title, Integer timelength) {
super();
this.id = id;
this.title = title;
this.timelength = timelength;
}
public Video() { }
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public Integer getTimelength() {
return timelength;
}
public void setTimelength(Integer timelength) {
this.timelength = timelength;
}
public String toString() {
return "Video [id=" + id + ", title=" + title + ", timelength="
+ timelength + "]";
}
}

添加业务类VideoService类

package cn.class3g.service;
...
public class VideoService {

/**

实验环境中使用pc的ip，不能用localhost或127.0.0.1

* 从服务器获取最新的视频资讯
*
* @return
* @throws Throwable
*/
public static List<Video> getLastVideos()
throws Throwable {
String path =
"http://192.168.1.102:8080/videoweb/video/list.do";
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setConnectTimeout(5 * 1000);
conn.setRequestMethod("GET");
InputStream inStream = conn.getInputStream();
return parseXML(inStream);
}

private static List<Video> parseXML(InputStream inStream)
throws Exception {
Video video = null;
List<Video> videos = null;
XmlPullParser pullParser = Xml.newPullParser();
pullParser.setInput(inStream, "UTF-8");

int event = pullParser.getEventType();// 触发第一个事件

while (event != XmlPullParser.END_DOCUMENT) {
switch (event) {
case XmlPullParser.START_DOCUMENT:
videos = new ArrayList<Video>();
break;
case XmlPullParser.START_TAG:
if ("video".equals(pullParser.getName())) {
int id = new Integer(pullParser.getAttributeValue(0));
video = new Video();
video.setId(id);
}
if (video != null) {
if ("title".equals(pullParser.getName())) {
video.setTitle(pullParser.nextText());
}
if ("timelength".equals(pullParser.getName())) {
video.setTimelength(new Integer(pullParser.nextText()));
}
}
break;

case XmlPullParser.END_TAG:
if ("video".equals(pullParser.getName())) {
videos.add(video);
video = null;
}
break;
}
event = pullParser.next();
}
return videos;
}
}

Activity类MyVideoNewsActivity

public class MyVideoNewsActivity extends Activity {

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

try {
List<Video> videos = VideoService.getLastVideos();//获取最新视频资讯
ListView listView = (ListView)this.findViewById(R.id.listView);
List<HashMap<String, Object>> data = new ArrayList<HashMap<String,Object>>();
for(Video video : videos){
HashMap<String, Object> item = new HashMap<String, Object>();
item.put("title", video.getTitle());
item.put("timelength", "时长:"+video.getTimelength());
item.put("id", video.getId());
data.add(item);
}
SimpleAdapter adapter = new SimpleAdapter(this, data, R.layout.item,
new String[]{"title","timelength"},
new int[]{R.id.title, R.id.timelength});
listView.setAdapter(adapter);
} catch (Throwable e) {
Log.e("TAG", e.toString());
Toast.makeText(this, R.string.error, 1).show();
}
}
}

Androd中获取网页代码

布局

代码：在前面的ImageService.getImage（）方法基础上修改即可

HtmlService

ShowHtmlActivity

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