Java发HTTP POST请求（内容为xml格式）

Java发HTTP POST请求（内容为xml格式）

一、POST请求

服务器地址：http://5.0.217.50:17001/VideoSend

服务器提供的是xml格式的http接口，接口定义如下：

<!--视频点送: videoSend-->
<videoSend>
    <header>
        <sid>%s</sid>
        <type>service</type>
    </header>
    <service name="videoSend">
    <fromNum>%s</fromNum>
    <toNum>%s</toNum>                   <!--需要接通的用户的电话号码 -->
    <videoPath>%s</videoPath>           <!--视频文件路径 -->
    <chargeNumber>%s</chargeNumber>     <!--计费号码 -->
    </service>
</videoSend>  

<!--视频点送返回结果: videoSendResult-->
<videoSend>
    <header>
    <sid>%s</sid>
    <type>service</type>
    </header>
    <service name="videoSendResult">
    rescode>%s</rescode>                 <!--0000:视频点送成功，0001:请求参数信息错误, 0002:接通用户失败-->
    </service>
</videoSend>

对应调用端的Java代码（只是个demo，参数都暂时写死了）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);
    }
}

二、XML传输

1、客户端代码

通过Http Post Xml传递数据，客户端一般是通过URL建立到服务端的连接，向服务端发送xml数据，然后获取服务端的响应并进行解析：

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{
       //获得到位置服务的链接
        URL url = new URL(urlStr);
        URLConnection urlCon = url.openConnection();
        urlCon.setDoOutput(true);
        urlCon.setDoInput(true);
        urlCon.setUseCaches(false);   

       //将xml数据发送到位置服务
        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) {   

        }
}

2、服务端代码

服务端一般首先获取客户端发来的xml数据，进行解析，并将响应返回给客户端：

try{
    //解析对方发来的xml数据，获得EventID节点的值
    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);
    //根据evtid查找任务，生成xml字符串   

    UfgovDBUtil dbUtil = new UfgovDBUtil();
    String xmlString = dbUtil.fetchTaskData(evtid);
    //System.out.println("returned xmlString:" + xmlString);
    //把xml字符串写入响应
    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();
}

转自：Java发HTTP POST请求（内容为xml格式）