java 获取天气预报
2009-09-10 00:00:00 来源:WEB开发网最近有个项目要用到天气预报,本来我一直就听说过网络上有提供webservice应用的,所以你调用接口很简单的就能拿到数据。但是事实在我做的时候,却非常郁闷。在一开始的时候,我还没发现,因为一开始的时候非常顺利,然后项目在服务器上跑的时候,天气预报这块却出了问题,经过排查,原来人家每天是提供一定量的访问量的,超过了不给数据。我想想挺来气的,这不是浪费我时间嘛。后来找了很多,未果。
最后我想还是用google吧,下面的程序原理,提交请求去google,然后解析页面。
上程序:
package mobi.tuitui.util;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.Date;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.httpclient.DefaultHttpMethodRetryHandler;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpStatus;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class WeatherReport {
/**
* 发送请求到GOOGLE获取天气信息页面
* @param city
* @return
* @throws Exception
*/
@SuppressWarnings("deprecation")
private static String getInputStream(String city) {
try {
HttpClient httpClient = new HttpClient();
String hostUrl = "http://www.google.cn/search?hl=zh-CN&q=tq%20" + URLEncoder.encode(city);
GetMethod getMethod = new GetMethod(hostUrl);
// 使用系统提供的默认的恢复策略
getMethod.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
try {
// 执行getMethod
int statusCode = httpClient.executeMethod(getMethod);
if (statusCode != HttpStatus.SC_OK) {
System.err.println("Method failed: " + getMethod.getStatusLine());
}
String result = getMethod.getResponseBodyAsString();
return result;
} catch (HttpException e) {
// 发生致命的异常,可能是协议不对或者返回的内容有问题
System.out.println("Please check your provided http address!");
e.printStackTrace();
} catch (IOException e) {
// 发生网络异常
e.printStackTrace();
} finally {
// 释放连接
getMethod.releaseConnection();
}
} catch (Exception e) {
e.printStackTrace();
return null;
}
return null;
}
/**
* 将获取的包含天气页面的信息解析出相关的天气信息
* @param result
* @identifier
* @return
*/
public static String readText(String result, String identifier) {
Pattern shopNumberPattern = Pattern.compile(identifier);
Matcher shopNamMatcher = shopNumberPattern.matcher(result);
if (shopNamMatcher.find())
return shopNamMatcher.group(1);
return "";
}
public static String getWeather(String city) {
String result = readText(getInputStream(city), "<div style=\"padding:5px;float:left\">(.+?)</div></div>");
String weatherDetail = readText(result, "<div style=\"font-size:140%\">(.+?)%");
weatherDetail = weatherDetail.replaceAll("<div>", "").replaceAll("</div>", "").replaceAll("<br>", "").replace(":", ":");
return weatherDetail;
}
}
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