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使用HttpClient 发送get、post请求,及其解析xml返回数据

时间:2015-11-17 18:32:27      阅读:404      评论:0      收藏:0      [点我收藏+]

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一、关于HttpClient的使用:

可以参考这个博客地址,这里有详细的介绍,需要的可以先看一下:

地址是:http://blog.csdn.net/wangpeng047/article/details/19624529

 

二、项目中用到HttpClient 去请求一个地址,但是用get请求如果参数过多,不同的浏览器会导致不同程度的参数丢失,所以还应该要有post的请求的方式,在加上post请求方式的后,发现不能用原来解析get请求的方式来解析服务器返回的数据,经多方查找资料最终找到了解决方案,故记之;

代码如下:

  1 package com.shusheng.util;
  2 
  3 import java.io.IOException;
  4 import java.io.InputStream;
  5 import java.io.UnsupportedEncodingException;
  6 import java.util.ArrayList;
  7 import java.util.HashMap;
  8 import java.util.List;
  9 import java.util.Map;
 10 import java.util.regex.Matcher;
 11 import java.util.regex.Pattern;
 12 
 13 import javax.xml.parsers.DocumentBuilder;
 14 import javax.xml.parsers.DocumentBuilderFactory;
 15 import javax.xml.parsers.ParserConfigurationException;
 16 
 17 
 18 import org.apache.http.HttpEntity;
 19 import org.apache.http.HttpResponse;
 20 import org.apache.http.NameValuePair;
 21 import org.apache.http.client.ClientProtocolException;
 22 import org.apache.http.client.HttpClient;
 23 import org.apache.http.client.entity.UrlEncodedFormEntity;
 24 import org.apache.http.client.methods.CloseableHttpResponse;
 25 import org.apache.http.client.methods.HttpGet;
 26 import org.apache.http.client.methods.HttpPost;
 27 import org.apache.http.impl.client.CloseableHttpClient;
 28 import org.apache.http.impl.client.DefaultHttpClient;
 29 import org.apache.http.impl.client.HttpClients;
 30 import org.apache.http.message.BasicNameValuePair;
 31 import org.apache.http.util.EntityUtils;
 32 import org.dom4j.DocumentException;
 33 import org.dom4j.DocumentHelper;
 34 import org.w3c.dom.DOMException;
 35 import org.w3c.dom.Document;
 36 import org.w3c.dom.Element;
 37 import org.w3c.dom.NodeList;
 38 import org.xml.sax.SAXException;
 39 
 40 public class SendSmsMessage {
 41     //验证用户信息
 42     private static final String username = "username";
 43     private static final String password = "password";
 44     //字符编码及其他参数
 45     private static final String charset = "utf-8";
 46     private static final String url = "http://127.0.0.1:8080/WebAPI/dtest.actioin";
 47     /*
 48      * 因请求返回的数据中只需要code和result两个字段的信息,因此方法只返回一个存有这两个值的map
 49     */
 50     //get方式请求
 51     public static Map<String,String> sendMessageByGet(String content,String phones){
 52         Map<String,String> map = new HashMap<String, String>();
 53         HttpClient httpClient = new DefaultHttpClient();
 54         String fullUrl = url + "?user="+username+"&pwd="+password+"&mobiles="+phones+"&contents="+content;
 55         HttpGet httpGet = new HttpGet(fullUrl);
 56         try {
 57             HttpResponse response = httpClient.execute(httpGet);
 58             HttpEntity entity = response.getEntity();
 59             if (null != entity) {
 60                 InputStream in = entity.getContent();//将返回的内容流入输入流内
 61                 // 创建一个Document解析工厂
 62                 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
 63                 DocumentBuilder builder = factory.newDocumentBuilder();
 64                 // 将输入流解析为Document
 65                 Document document = builder.parse(in);//用输入流实例化Document
 66 
 67                 Element rootElement = document.getDocumentElement();
 68         
 69                 NodeList codeNode = rootElement.getElementsByTagName("Code");
 70                 map.put("Code", codeNode.item(0).getTextContent());        
 71 
 72                 NodeList resultNode = rootElement.getElementsByTagName("Result");
 73                 map.put("Result", resultNode.item(0).getTextContent());
 74                 
 75             }
 76         } catch (ClientProtocolException e) {
 77             e.printStackTrace();
 78         } catch (IllegalStateException e) {
 79             e.printStackTrace();
 80         } catch (DOMException e) {
 81             e.printStackTrace();
 82         } catch (IOException e) {
 83             e.printStackTrace();
 84         } catch (ParserConfigurationException e) {
 85             e.printStackTrace();
 86         } catch (SAXException e) {
 87             e.printStackTrace();
 88         }
 89         return map;
 90     }
 91     
 92     //post方式请求
 93     public static Map<String,String> sendMessageByPost(String content,String phones){
 94         Map<String,String> map = new HashMap<String, String>();
 95         // 创建默认的httpClient实例.    
 96         CloseableHttpClient httpclient = HttpClients.createDefault(); 
 97         // 创建httppost    
 98         HttpPost httppost = new HttpPost(url);  
 99         // 创建参数队列    
100         List<NameValuePair> formparams = new ArrayList<NameValuePair>();
101         formparams.add(new BasicNameValuePair("user", username));  
102         formparams.add(new BasicNameValuePair("pwd", password)); 
103         formparams.add(new BasicNameValuePair("mobiles", phones)); 
104         formparams.add(new BasicNameValuePair("contents", content)); 
105         
106         UrlEncodedFormEntity uefEntity;
107         try{
108             uefEntity = new UrlEncodedFormEntity(formparams, charset);
109             httppost.setEntity(uefEntity);
110             System.out.println("executing request " + httppost.getURI());
111             CloseableHttpResponse response = httpclient.execute(httppost);
112             try{
113                 HttpEntity entity = response.getEntity(); 
114                 if (entity != null) { 
115                     //将返回的数据直接转成String
116                     String str = EntityUtils.toString(entity, "UTF-8") ;
117                     System.out.println("--------------------------------------");  
118                     //注意这里不能写成EntityUtils.toString(entity, "UTF-8"),因为EntityUtils只能调用一次,否则会报错:java.io.IOException: Attempted read from closed stream
119                     System.out.println("Response content: " + str);  
120                     System.out.println("--------------------------------------");  
121                     
122                     //这里用str作为参数获得 Document 对象
123                     org.dom4j.Document document = DocumentHelper.parseText(str);
124                     org.dom4j.Element rootElement = document.getRootElement();
125                     
126                     String code = rootElement.element("Code").getText();
127                     String result = rootElement.element("Result").getText();
128                     map.put("Code", code);
129                     map.put("Result", result);
130                 }
131             }catch (DocumentException e) {
132                 // TODO Auto-generated catch block
133                 e.printStackTrace();
134             }finally{
135                 response.close();
136             }
137             
138         } catch (ClientProtocolException e) {  
139             e.printStackTrace();  
140         } catch (UnsupportedEncodingException e1) {  
141             e1.printStackTrace();  
142         } catch (IOException e) {  
143             e.printStackTrace();  
144         }finally{
145              // 关闭连接,释放资源    
146             try {  
147                 httpclient.close();  
148             } catch (IOException e) {  
149                 e.printStackTrace();  
150             }  
151         }
152         
153         return map ;
154     }
155     
156     //验证手机号方法
157     public static boolean checkPhoneNo(String phone){
158         if(phone==null || phone.trim().equals("")){
159             return false;
160         }
161         String regExp = "^[1]([3][0-9]{1}|59|58|88|89)[0-9]{8}$"; 
162         Pattern p = Pattern.compile(regExp);  
163         Matcher m = p.matcher(phone);  
164         return m.find();
165     }
166     
167     public static void main(String args[]){
168         //System.out.println(checkPhoneNo(null));
169         sendMessageByPost("【post请求】测试20151117_006","[正确手机号]");
170     }
171 }

 这里贴一下服务器的返回String类型的xml数据:

 

1 <?xml version="1.0" encoding="utf-8"?>
2 <APIResult xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://tempuri.org/">
3 <Code>12270</Code>
4 <Result>短信提交成功</Result>
5 </APIResult>

三、以上代码也可以看做是用java解析返回类型为xml的数据的方法;通过inputstream或者String 创建Document对象,然后通过该对象来解析每个分支的数据;上面代码中,如果在pos方式请求方法里用get方法那种解析xml的方式(即使用InputStream)会报错:java.io.IOException: Attempted read from closed stream;因此才使用String来创建Document的方式解析post请求返回的xml数据。有需要可以自己测试下,反正是个单独的类调试非常方便。

 

 

以上内容来自工作中遇到的问题以及上网查询所得,记以温之。

 

使用HttpClient 发送get、post请求,及其解析xml返回数据

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原文地址:http://www.cnblogs.com/crazytrip/p/4972322.html

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