1、图片
public void look(View v) {
String path = et_path.getText().toString();
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if(conn.getResponseCode() == 200){
InputStream is = conn.getInputStream();
Bitmap bitmap = BitmapFactory.decodeStream(is);
if(bitmap != null){
iv.setImageBitmap(bitmap);
}
}
} catch (Exception e) {
e.printStackTrace();
}
}
2、网页源码
public void look(View v) {
String path = et_path.getText().toString();
try {
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if(conn.getResponseCode() == 200){
InputStream is = conn.getInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
//把流转化成文本信息
while((len = is.read(buffer)) != -1){
bos.write(buffer,0,len);
}
String html = bos.toString();
html_tv.setText(html);
is.close();
bos.close();
}
} catch (Exception e) {
e.printStackTrace();
}
}
3、Xml形式的数据
public List<HeaderNew> getHeaderNews(Context context) throws Exception{
String path = context.getResources().getString(R.string.serverurl);
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if(conn.getResponseCode() == 200){
InputStream is = conn.getInputStream();
return parserHeaderNews(is);
}
return null;
}
public List<HeaderNew> parserHeaderNews(InputStream is) throws Exception {
List<HeaderNew> headerNews = null;
HeaderNew headerNew = null;
XmlPullParser parser = Xml.newPullParser();
parser.setInput(is,"UTF-8");
int eventType = parser.getEventType();
while(eventType != XmlPullParser.END_DOCUMENT){
switch(eventType){
case XmlPullParser.START_TAG:
if("HeaderNews".equals(parser.getName())){
headerNews = new ArrayList<HeaderNew>();
}else if("HeaderNew".equals(parser.getName())){
headerNew = new HeaderNew();
}else if("image".equals(parser.getName())){
headerNew.setImage(parser.nextText());
}else if("title".equals(parser.getName())){
headerNew.setTitle(parser.nextText());
}else if("content".equals(parser.getName())){
headerNew.setContent(parser.nextText());
}else if("count".equals(parser.getName())){
headerNew.setCount(parser.nextText());
}
break;
case XmlPullParser.END_TAG:
if("HeaderNew".equals(parser.getName())){
headerNews.add(headerNew);
headerNew = null;
}
break;
default:
break;
}
eventType = parser.next();
}
return headerNews;
}
4、抓取JSON格式的数据
抓取JSON格式的数据是以抓取网页源码为基础的。
public List<HeaderNew> getHeaderNewsFromJSON(Context context) throws Exception{
List<HeaderNew> headerNews = new ArrayList<HeaderNew>();
String path = context.getResources().getString(R.string.serverurl_json);
URL url = new URL(path);
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setRequestMethod("GET");
conn.setConnectTimeout(5000);
if(conn.getResponseCode() == 200){
InputStream is = conn.getInputStream();
ByteArrayOutputStream bos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len = 0;
while((len = is.read(buffer)) != -1){
bos.write(buffer,0,len);
}
String json = bos.toString();
JSONArray jsonArray = new JSONArray(json);
for(int i = 0 ; i < jsonArray.length() ; ++i){
JSONObject jsonObject = (JSONObject) jsonArray.get(i);
HeaderNew headerNew = new HeaderNew();
headerNew.setImage(jsonObject.getString("image"));
headerNew.setTitle(jsonObject.getString("title"));
headerNew.setContent(jsonObject.getString("content"));
headerNew.setCount(jsonObject.getString("count"));
headerNews.add(headerNew);
}
}
return headerNews;
}
5、抓取Xml形式的数据与抓取JSON形式的数据的区别
构建时的区别：
1）Xml形式的数据
服务器端直接返回数据集合,由JSP来构建XML形式的数据
代码如下：
servlet：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { HeaderNewsService service = new HeaderNewsService();
List<HeaderNew> headerNews = service.getHeaderNews(); request.setAttribute("headerNews", headerNews);
request.getRequestDispatcher("/WEB-INF/page/headernewsxml1.jsp").forward(request, response);
}
jsp：
<?xml version="1.0" encoding="UTF-8"?>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<%@ page contentType="text/html; charset=utf-8" %>
<HeaderNews>
<c:forEach items="${headerNews}" var="headerNew">
<HeaderNew>
<image>${headerNew.image }</image>
<title>${headerNew.title }</title>
<content>${headerNew.content}</content>
<count>${headerNew.count}</count>
</HeaderNew>
</c:forEach>
</HeaderNews>
2）JSON形式的数据
在服务器端构造好JSON格式的数据。JSP页面直接显示即可。
代码如下：
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException { HeaderNewsService service = new HeaderNewsService();
List<HeaderNew> headerNews = service.getHeaderNews();
StringBuilder sb = new StringBuilder("["); for(HeaderNew headerNew : headerNews){
sb.append("{");
sb.append("image:").append("\"").append(headerNew.getImage()).append("\"").append(",");
sb.append("title:").append("\"").append(headerNew.getTitle()).append("\"").append(",");
sb.append("content:").append("\"").append(headerNew.getContent()).append("\"").append(",");
sb.append("count:").append("\"").append(headerNew.getCount()).append("\"");
sb.append("}");
sb.append(",");
}
sb.deleteCharAt(sb.length() - 1);
sb.append("]"); String json = sb.toString();
request.setAttribute("json",json);
request.getRequestDispatcher("/WEB-INF/page/headernewsjson.jsp").forward(request,response);
}
JSP：
<%@ page contentType="text/html; charset=UTF-8" %>
${json}
附上JSON数据的格式：
[{ a : b , c : d } , {.....}]