本文使用HttpClient发送GET请求，并使用DOM方式获得返回的xml信息。(本人刚开始学习Java,有错误望斧正)

1.使用HttpClient发送GET请求

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpEntity;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.CloseableHttpResponse;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.CloseableHttpClient;

import org.apache.http.impl.client.HttpClients;

import org.apache.http.message.BasicNameValuePair;

import org.apache.http.util.EntityUtils;

public class SendGetRequest {

public static void main(String[] args) throws IOException {

// 向百度发送GET请求

CloseableHttpClient httpClient = HttpClients.createDefault();

try {

HttpGet httpGet = new HttpGet(

"http://www.baidu.com/s?ie=UTF-8&wd=blog.myriadrecord.com");

CloseableHttpResponse httpResponse = httpClient.execute(httpGet);

try {

System.out.println(httpResponse.getStatusLine());

HttpEntity httpEntity = httpResponse.getEntity();

//添加处理返回数据的代码

System.out.println(EntityUtils.toString(httpEntity));// 例如将返回的数据转换为字符串并输出

EntityUtils.consume(httpEntity);

} finally {

httpResponse.close();

}

} catch (ClientProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} finally {

httpClient.close();

}

}

}

2.解析XML

解析的xml文件如下：

485532

import java.io.InputStream;

import javax.xml.parsers.DocumentBuilder;

import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.http.HttpEntity;

import org.apache.http.HttpResponse;

import org.apache.http.client.HttpClient;

import org.apache.http.client.methods.HttpGet;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.util.EntityUtils;

import org.w3c.dom.Document;

import org.w3c.dom.Element;

import org.w3c.dom.Node;

import org.w3c.dom.NodeList;

public class sendGetRequsetAndShowXMLInfo {

static String URL = "http://8.8.8.8/services/CommonSession/getStoreTree?storeId=0";

public static void main(String[] args) throws Exception {

HttpClient httpClient = new DefaultHttpClient();

HttpGet httpGet = new HttpGet(URL);

HttpResponse response = httpClient.execute(httpGet);

HttpEntity entity = response.getEntity();

if (null != entity) {

InputStream in = entity.getContent();//将返回的内容流入输入流内

EntityUtils.consume(entity);

httpGet.releaseConnection();

DocumentBuilderFactory factory = DocumentBuilderFactory

.newInstance();

DocumentBuilder builder = factory.newDocumentBuilder();

Document document = builder.parse(in);//用输入流实例化Document

Element rootElement = document.getDocumentElement();

System.out.println(rootElement.getNodeName() + ": name="

+ rootElement.getAttribute("name"));

NodeList timeNode = rootElement.getElementsByTagName("time");

System.out.println(timeNode.item(0).getNodeName() + ":"

+ timeNode.item(0).getTextContent());

NodeList gradeNode = rootElement.getElementsByTagName("grade");

NodeList classNode = gradeNode.item(0).getChildNodes();

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

Element e = (Element) classNode.item(i);

System.out.println(e.getNodeName() + ": name="

+ e.getAttribute("name") + " Number="

+ e.getTextContent());

}

}

}

}

注：之所以xml的格式如此之难看是因为本方法无法跳过空白，

2013-9-9

48

55

32

以上格式的xml文件的缩进空白会同样被视作节点，从而使getChildNodes()返回的NodeList包含空白节点，需要添加额外判断。

参考：