[一天一项目]获取当前天气——获取某个地区当前的天气情况。

获取当前天气，用的新浪的api获取天气情况，只是读取了天气和温度信息，其他可以自行添加。

package com.project.Weather;

/**
* java获取新浪天气预报代码
*/
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

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

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
* 解析xml文档，包括本地文档和url
*
*/
public class GetWeather {

InputStream inStream;

Element root;

public InputStream getInStream() {

return inStream;

}

public void setInStream(InputStream inStream) {

this.inStream = inStream;

}

public Element getRoot() {

return root;

}

public void setRoot(Element root) {

this.root = root;

}

public GetWeather() {

}

/**
* 通过输入流来获取新浪接口信息
* @param inStream
*/
public GetWeather(InputStream inStream) {

if (inStream != null) {

this.inStream = inStream;

DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();

try {

DocumentBuilder domBuilder = domfac.newDocumentBuilder();

Document doc = domBuilder.parse(inStream);

root = doc.getDocumentElement();

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}
}
}

public GetWeather(String path) {

InputStream inStream = null;

try {

inStream = new FileInputStream(path);

} catch (FileNotFoundException e1) {

e1.printStackTrace();

}

if (inStream != null) {

this.inStream = inStream;

DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();

try {

DocumentBuilder domBuilder = domfac.newDocumentBuilder();

Document doc = domBuilder.parse(inStream);

root = doc.getDocumentElement();

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}
}
}

public GetWeather(URL url) {

InputStream inStream = null;

try {

inStream = url.openStream();

} catch (IOException e1) {

e1.printStackTrace();

}

if (inStream != null) {

this.inStream = inStream;

DocumentBuilderFactory domfac = DocumentBuilderFactory.newInstance();

try {

DocumentBuilder domBuilder = domfac.newDocumentBuilder();

Document doc = domBuilder.parse(inStream);

root = doc.getDocumentElement();

} catch (ParserConfigurationException e) {

e.printStackTrace();

} catch (SAXException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

}
}
}

/**
*
* @param nodes
* @return 单个节点多个值以分号分隔
*/
public Map<String, String> getValue(String[] nodes) {

if (inStream == null || root==null) {

return null;

}

Map<String, String> map = new HashMap<String, String>();

// 初始化每个节点的值为null
for (int i = 0; i < nodes.length; i++) {

map.put(nodes[i], null);

}

// 遍历第一节点
NodeList topNodes = root.getChildNodes();

if (topNodes != null) {

for (int i = 0; i < topNodes.getLength(); i++) {

Node book = topNodes.item(i);

if (book.getNodeType() == Node.ELEMENT_NODE) {

for (int j = 0; j < nodes.length; j++) {

for (Node node = book.getFirstChild(); node != null; node = node.getNextSibling()) {

if (node.getNodeType() == Node.ELEMENT_NODE) {

if (node.getNodeName().equals(nodes[j])) {

String val = node.getTextContent();

String temp = map.get(nodes[j]);

if (temp != null && !temp.equals("")) {

temp = temp + ";" + val;

} else {

temp = val;

}

map.put(nodes[j], temp);

}
}
}
}
}
}
}
return map;
}
public static void main(String[] args) throws UnsupportedEncodingException {
System.out.println("请输入您需要查询的地点:");
Scanner input = new Scanner(System.in);
String city = input.next();
String city_url = URLEncoder.encode(city, "GBK");
String link="http://php.weather.sina.com.cn/xml.php?city="+city_url+"&password=DJOYnieT8234jlsK&day=0";

URL url;

try {

url = new URL(link);
GetWeather parser = new GetWeather(url);
String[] nodes = {"city","status1","temperature1","status2","temperature2"};
Map<String, String> map = parser.getValue(nodes);
System.out.println(map.get(nodes[0])+" 今天白天："+map.get(nodes[1])+" 最高温度："+map.get(nodes[2])+"℃ 今天夜间："+map.get(nodes[3])+" 最低温度："+map.get(nodes[4])+"℃ ");
} catch (MalformedURLException e) {
e.printStackTrace();
}

}
}