Java發HTTP POST請求（內容為xml格式）

<span style=""> </span><span style="">今天在給平台用戶提供http簡單接口的時候，順便寫了個調用的Java類供他參考。</span><br style=""><span style="">     服務器地址：http://5.0.217.50:17001/VideoSend</span><br style=""><span style="">     服務器提供的是xml格式的http接口，接口定義如下：</span>

<!--視頻點送: videoSend-->
<videoSend>
    <header>
        <sid>%s</sid>
        <type>service</type>
    </header>
    <service name="videoSend">
    <fromNum>%s</fromNum>
    <toNum>%s</toNum>                   <!--需要接通的用戶的電話號碼 -->
    <videoPath>%s</videoPath>           <!--視頻文件路徑 -->
    <chargeNumber>%s</chargeNumber>     <!--計費號碼 -->
    </service>
</videoSend>


<!--視頻點送返回結果: videoSendResult-->
<videoSend>
    <header>
    <sid>%s</sid>
    <type>service</type>
    </header>
    <service name="videoSendResult">
    rescode>%s</rescode>                 <!--0000:視頻點送成功，0001:請求參數信息錯誤, 0002:接通用戶失敗-->
    </service>
</videoSend>

對應調用端的Java代碼（只是個demo，參數都暫時寫死了）如下：

 

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class HttpPostTest {
    void testPost(String urlStr) {
        try {
            URL url = new URL(urlStr);
            URLConnection con = url.openConnection();
            con.setDoOutput(true);
            con.setRequestProperty("Pragma:", "no-cache");
            con.setRequestProperty("Cache-Control", "no-cache");
            con.setRequestProperty("Content-Type", "text/xml");

            OutputStreamWriter out = new OutputStreamWriter(con
                    .getOutputStream());
            String xmlInfo = getXmlInfo();
            System.out.println("urlStr=" + urlStr);
            System.out.println("xmlInfo=" + xmlInfo);
            out.write(new String(xmlInfo.getBytes("ISO-8859-1")));
            out.flush();
            out.close();
            BufferedReader br = new BufferedReader(new InputStreamReader(con
                    .getInputStream()));
            String line = "";
            for (line = br.readLine(); line != null; line = br.readLine()) {
                System.out.println(line);
            }
        } catch (MalformedURLException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    private String getXmlInfo() {
        StringBuilder sb = new StringBuilder();
        sb.append("<videoSend>");
        sb.append("    <header>");
        sb.append("        <sid>1</sid>");
        sb.append("        <type>service</type>");
        sb.append("    </header>");
        sb.append("    <service name=\"videoSend\">");
        sb.append("        <fromNum>0000021000011001</fromNum>");
        sb.append("           <toNum>33647405</toNum>");
        sb.append("        <videoPath>mnt/5.0.217.50/resources/80009.mov</videoPath>");
        sb.append("        <chargeNumber>0000021000011001</chargeNumber>");
        sb.append("    </service>");
        sb.append("</videoSend>");
        return sb.toString();
    }

    public static void main(String[] args) {
        String url = "http://5.0.217.50:17001/VideoSend";
        new HttpPostTest().testPost(url);
    }
}

 2 XML傳輸

 

二、客戶端代碼

通過Http Post Xml傳遞數據，客戶端一般是通過URL建立到服務端的連接，向服務端發送xml數據，然后獲取服務端的響應並進行解析：

String xmlString = "<?xml version='1.0' encoding='gb2312'?>"
                      + "<Req>"
                      + "<EventContentReq>"
                      + "<EventID>101</EventID >"
                      + "</EventContentReq>"
                      + "</Req>";

byte[] xmlData = xmlString.getBytes();

String urlStr = "http://124.128.62.164:7001/FetchTaskDataServlet";

DataInputStream input = null;

java.io.ByteArrayOutputStream out = null;

try{

       //獲得到位置服務的鏈接

        URL url = new URL(urlStr);

        URLConnection urlCon = url.openConnection();

        urlCon.setDoOutput(true);

        urlCon.setDoInput(true);

        urlCon.setUseCaches(false);

       //將xml數據發送到位置服務

        urlCon.setRequestProperty("Content-Type", "text/xml");

        urlCon.setRequestProperty("Content-length",String.valueOf(xmlData.length));

        DataOutputStream printout = new DataOutputStream(urlCon.getOutputStream());

        printout.write(xmlData);

        printout.flush();

        printout.close();

        input = new DataInputStream(urlCon.getInputStream());

       byte[] rResult;

        out = new java.io.ByteArrayOutputStream();

       byte[] bufferByte = newbyte[256];

       int l = -1;

       int downloadSize = 0;

       while ((l = input.read(bufferByte)) > -1) {

            downloadSize += l;

            out.write(bufferByte, 0, l);

            out.flush();

        }

        rResult = out.toByteArray();

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

        DocumentBuilder db = dbf.newDocumentBuilder();

        Document d = db.parse(new ByteArrayInputStream(rResult));

        String TaskAddr = d.getElementsByTagName("TaskAddr").item(0).getFirstChild().getNodeValue();

        System.out.println("TaskAddr:"+TaskAddr);

}

catch(Exception e){

        e.printStackTrace();

}

finally {

       try {

               out.close();

               input.close();

        }

       catch (Exception ex) {

        }

}
 三、服務端代碼 服務端一般首先獲取客戶端發來的xml數據，進行解析，並將響應返回給客戶端： 
           try{

//解析對方發來的xml數據，獲得EventID節點的值

        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();

        DocumentBuilder db = dbf.newDocumentBuilder();

        Document d = db.parse(request.getInputStream());

        String evtid = d.getElementsByTagName("EventID").item(0).getFirstChild().getNodeValue();

//                    System.out.println("evtid" + evtid);

       //根據evtid查找任務，生成xml字符串

        UfgovDBUtil dbUtil = new UfgovDBUtil();

        String xmlString = dbUtil.fetchTaskData(evtid);

//                    System.out.println("returned xmlString:" + xmlString);

       //把xml字符串寫入響應

       byte[] xmlData = xmlString.getBytes();

        response.setContentType("text/xml");

        response.setContentLength(xmlData.length);

        ServletOutputStream os = response.getOutputStream();

        os.write(xmlData);

        os.flush();

        os.close();

}

catch(Exception e){

        e.printStackTrace();

}
轉自：http://a52071453.iteye.com/blog/1706949