抓取天气实例

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package tos.app.query.tools.weather.domain;

import java.io.InputStream;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.URL;
import java.net.URLConnection;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

public class WeatherReport {

public WeatherReport() {
super();
}

private static String getSoapRequest(String city) {
StringBuilder sb = new StringBuilder();
sb
.append("<?xml version=/"1.0/" encoding=/"utf-8/"?>"
+ "<soap:Envelope xmlns:xsi=/"http://www.w3.org/2001/XMLSchema-instance/" "
+ "xmlns:xsd=/"http://www.w3.org/2001/XMLSchema/" "
+ "xmlns:soap=/"http://schemas.xmlsoap.org/soap/envelope//">"
+ "<soap:Body> <getWeatherbyCityName xmlns=/"http://WebXml.com.cn//">"
+ "<theCityName>" + city
+ "</theCityName> </getWeatherbyCityName>"
+ "</soap:Body></soap:Envelope>");
return sb.toString();
}

/**
* 用户把SOAP请求发送给服务器端，并返回服务器点返回的输入流
*
* @param city
* 用户输入的城市名称
* @return 服务器端返回的输入流，供客户端读取
* @throws Exception
*/
private static InputStream getSoapInputStream(String city) throws Exception {
try {
String soap = getSoapRequest(city);
if (soap == null) {
return null;
}
URL url = new URL(
"http://www.webxml.com.cn/WebServices/WeatherWebService.asmx");
URLConnection conn = url.openConnection();
conn.setUseCaches(false);
conn.setDoInput(true);
conn.setDoOutput(true);

conn.setRequestProperty("Content-Length", Integer.toString(soap
.length()));
conn.setRequestProperty("Content-Type", "text/xml; charset=utf-8");
conn.setRequestProperty("SOAPAction",
"http://WebXml.com.cn/getWeatherbyCityName");

OutputStream os = conn.getOutputStream();
OutputStreamWriter osw = new OutputStreamWriter(os, "utf-8");
osw.write(soap);
osw.flush();
osw.close();

InputStream is = conn.getInputStream();
return is;
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

/**
* 对服务器端返回的XML进行解析
*
* @param city
* 用户输入的城市名称
* @return 字符串用,分割
*/
public static String getWeather(String city) {
try {
Document doc;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
dbf.setNamespaceAware(true);
DocumentBuilder db = dbf.newDocumentBuilder();
InputStream is = getSoapInputStream(city);
doc = db.parse(is);
NodeList nl = doc.getElementsByTagName("string");
StringBuffer sb = new StringBuffer();
for (int count = 0; count < nl.getLength(); count++) {
Node n = nl.item(count);
if(n.getFirstChild().getNodeValue().equals("查询结果为空！")) {
sb = new StringBuffer("#") ;
break ;
}
sb.append(n.getFirstChild().getNodeValue() + "#/n");
}
is.close();
return sb.toString();
} catch (Exception e) {
e.printStackTrace();
return null;
}
}

public static void main(String[] args) throws Exception {
System.out.println(getWeather("长沙"));
System.out.println("po&oi".split("&").length) ;
System.out.println("##".split("#").length) ;
}
}

package tos.app.query.tools.weather.domain;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class WeatherServlet extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8") ;
String city = request.getParameter("city") ;
String info = WeatherReport.getWeather(city) ;
request.setAttribute("info", info) ;
request.getRequestDispatcher("/weatherInfo.jsp").forward(request, response) ;
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {

this.doGet(request, response) ;
}
}

<%@ page language="java" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>城市天气信息</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<LINK rel="stylesheet" type="text/css" href="<%=request.getContextPath()%>/views/common/styles/style.css">
</head>

<body>
<%
String info = (String) request.getAttribute("info") ;
if(info.equals("#")) {
%>
<h1>该城市暂不被支持天气预报服务</h1>
<%
} else {
String[] infos = info.split("#") ;
%>
<table border="1">
<tr>
<td colspan="3">
72小时天气预报


<%=infos[0]%>   <%=infos[1]%>


<%=infos[4] %>发布


</td>
</tr>
<tr align="center">
<td>
<table>
<tr align="center">

<td>

<%=infos[6] %>

</td>
</tr>
<tr align="center">

<td>
<img src="<%=request.getContextPath()%>/images/a_<%=infos[8]%>" />
<img src="<%=request.getContextPath()%>/images/a_<%=infos[9]%>" />
</td>
</tr>
<tr align="center">

<td>

<%=infos[5] %> 
<%=infos[7] %> 

</td>
</tr>
</table>
</td>

<td>
<table align="center">
<tr align="center">
<td>


<%=infos[13] %>

</td>
</tr>

<tr align="center">
<td>

<img src="<%=request.getContextPath()%>/images/a_<%=infos[15]%>">
<img src="<%=request.getContextPath()%>/images/a_<%=infos[16]%>">
</td>
</tr>

<tr align="center">
<td>


<%=infos[12] %> 
<%=infos[14] %> 

</td>
</tr>
</table>
</td>
<td>
<table align="center">
<tr align="center">
<td>


<%=infos[18] %>

</td>
</tr>
<tr align="center">
<td>

<img src="<%=request.getContextPath()%>/images/a_<%=infos[20]%>" />
<img src="<%=request.getContextPath()%>/images/a_<%=infos[21]%>" />
</td>
</tr>
<tr align="center">
<td>


<%=infos[17] %> 
<%=infos[19] %> 

</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="3">

温馨提醒
</td>
</tr>
<tr>
<td colspan="3">

<table>
<tr>
<td>
<img src="<%=request.getContextPath()%>/images/sun.gif" />
</td>
<td>

<%=infos[10] %>

</td>
</tr>
</table>
</td>
</tr>
<tr>
<td colspan="3">
<%
String str = "" ;
String s1 = "" ;
String s1Content = "" ;
String s2 = "" ;
String s2Content = "" ;
String s3 = "" ;
String s3Content = "" ;
String s4 = "" ;
String s4Content = "" ;
String s5 = "" ;
String s5Content = "" ;
String s6 = "" ;
String s6Content = "" ;
String s7 = "" ;
String s7Content = "" ;
try {
//这里开始进行具体详细测试
str = infos[11] ;
//穿衣指数
s1 = str.substring(str.indexOf("穿衣指数："),str.indexOf("穿衣指数：")+4) ;
s1Content = str.substring(str.indexOf("穿衣指数：")+5,str.indexOf("感冒指数：")) ;
//感冒指数
s2 = str.substring(str.indexOf("感冒指数："),str.indexOf("感冒指数：")+4) ;
s2Content = str.substring(str.indexOf("感冒指数：")+5,str.indexOf("晨练指数：")) ;

//晨练指数
s3 = str.substring(str.indexOf("晨练指数："),str.indexOf("晨练指数：")+4) ;
s3Content = str.substring(str.indexOf("晨练指数：")+5,str.indexOf("交通指数：")) ;
//交通指数
s7 = str.substring(str.indexOf("交通指数："),str.indexOf("交通指数：")+4) ;
s7Content = str.substring(str.indexOf("交通指数：")+5,str.indexOf("中暑指数：")) ;
//中暑指数
s4 = str.substring(str.indexOf("中暑指数："),str.indexOf("中暑指数：")+4) ;
s4Content = str.substring(str.indexOf("中暑指数：")+5,str.indexOf("防晒指数：")) ;
//防晒指数
s5 = str.substring(str.indexOf("防晒指数："),str.indexOf("防晒指数：")+4) ;
s5Content = str.substring(str.indexOf("防晒指数：")+5,str.indexOf("旅行指数：")) ;
//旅行指数
s6 = str.substring(str.indexOf("旅行指数："),str.indexOf("旅行指数：")+4) ;
s6Content = str.substring(str.indexOf("旅行指数：")+5) ;
%>
<table>
<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_01.gif" />
</td>
<td>


<%=s1 %> 


</td>
<td>

<%=s1Content %>

</td>
</tr>
<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_20.gif" />
</td>
<td>


<%=s2 %> 


</td>
<td>

<%=s2Content %>

</td>
</tr>

<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_03.gif" />
</td>
<td>


<%=s3 %> 


</td>
<td>

<%=s3Content %>

</td>
</tr>
<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_22.gif" />
</td>
<td>


<%=s4 %> 


</td>
<td>

<%=s4Content %>

</td>
</tr>
<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_07.gif" />
</td>
<td>


<%=s5 %> 


</td>
<td>

<%=s5Content %>

</td>
</tr>
<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_31.gif" />
</td>
<td>


<%=s6 %> 


</td>
<td>

<%=s6Content %>

</td>
</tr>
<tr>
<td width="50">
<img src="<%=request.getContextPath()%>/images/zhishu_11.gif" />
</td>
<td>


<%=s7 %> 


</td>
<td>

<%=s7Content %>

</td>
</tr>
</table>

</td>
</tr>
</table>
<%
} catch(Exception e) {

}

%>
<%
}

%>

</body>
</html>