在通過http請求連線服務端程式時，有兩種方式httpClient這個不是標準的java庫，但是是開源專案，能夠快捷的開發，但如果做Android的開發，推薦使用httpUrlConnect這個工具。但是httpClient確實也是一個比較好用的工具。
這裡面只是做個demo，方便自己學習，也僅為大家做點參考。

客戶端程式碼：PostXml.java,但在之前需要匯入httpClient的包，可以去官網下，百度一下就能夠找到，將包新增到工程裡面。

package PostPager;

import java.io.IOException;
import java.util.ArrayList
 
;
import java.util.List;

import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache
 
.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.entity.StringEntity;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache
 
.http.params.CoreProtocolPNames;
import org.apache.http.util.EntityUtils;

public class PostXml {

    static String xml = "<?xml version='1.0' encoding='UTF-8'?><group><name>周成林</name><age>22</age><Image>我們</Image></group>";

    public static void main(String args[]) {
        try {

            CloseableHttpClient httpclient = HttpClients.createDefault();
            System.out.println(xml);

            HttpPost httpPost = new HttpPost("http://119.29.85.118//finance.php");          
            httpPost.addHeader("Content-Type","text/html;charset=UTF-8");

            //解決中文亂碼問題  
            StringEntity stringEntity = new StringEntity(xml,"UTF-8");
                stringEntity.setContentEncoding("UTF-8");  

            httpPost.setEntity(stringEntity);

            //CloseableHttpResponse response = httpclient.execute(httpPost);




            System.out.println("Executing request " + httpPost.getRequestLine());

        //   Create a custom response handler
            ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
                @Override
                public String handleResponse(final HttpResponse response)
                        throws ClientProtocolException, IOException {//                 
                    int status = response.getStatusLine().getStatusCode();
                    if (status >= 200 && status < 300) {

                        HttpEntity entity = response.getEntity();


                        return entity != null ? EntityUtils.toString(entity) : null;
                    } else {
                        throw new ClientProtocolException(
                                "Unexpected response status: " + status);
                    }
                }
            };          
            String responseBody = httpclient.execute(httpPost, responseHandler);
            System.out.println("----------------------------------------");
            System.out.println(responseBody);

        } catch (Exception e) {
            System.out.println(e);
        }
    }
}

finance.php
服務但程式碼：

 <?php

         @header("Content-type: text/html; charset=utf-8");
         $file_in = file_get_contents("php://input");
         $request=simplexml_load_string($file_in);
         foreach($request->children() as $childItem) {
          //輸出xml節點名稱和值
                 echo $childItem->getName() . "->".$childItem."<br />";
          //其他操作省略
         }
         $xml    ="我們";
         echo $xml;
 ?>

在這裡面有箇中文編碼的問題，全部設為UTF-8，一開始由於放鬆xml的方式中編碼沒有設定，預設不是UTF-8編碼，導致中文一直有問題。

最後的輸出結果為：
name->周成林
age->22
Image->我們
我們

httpClient類中提供了很多方法，需要我們好好研究一波。