Java發(fā)HTTP POST請(qǐng)求（內(nèi)容為xml格式）

青_春 2015-12-16

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Java代碼

<span style=""> </span><span style="">今天在給平臺(tái)用戶(hù)提供http簡(jiǎn)單接口的時(shí)候，順便寫(xiě)了個(gè)調(diào)用的Java類(lèi)供他參考。</span><br style=""><span style=""> 服務(wù)器地址：http://5.0.217.50:17001/VideoSend</span><br style=""><span style=""> 服務(wù)器提供的是xml格式的http接口，接口定義如下：</span>

Java代碼

<videoSend>
<header>
<sid>%s</sid>
<type>service</type>
</header>
<service name="videoSend">
<fromNum>%s</fromNum>
<toNum>%s</toNum>
<videoPath>%s</videoPath>
<chargeNumber>%s</chargeNumber>
</service>
</videoSend>
<videoSend>
<header>
<sid>%s</sid>
<type>service</type>
</header>
<service name="videoSendResult">
rescode>%s</rescode>
</service>
</videoSend>

對(duì)應(yīng)調(diào)用端的Java代碼（只是個(gè)demo，參數(shù)都暫時(shí)寫(xiě)死了）如下：

Java代碼

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(hù)端代碼

通過(guò)Http Post Xml傳遞數(shù)據(jù)，客戶(hù)端一般是通過(guò)URL建立到服務(wù)端的連接，向服務(wù)端發(fā)送xml數(shù)據(jù)，然后獲取服務(wù)端的響應(yīng)并進(jìn)行解析：

Java代碼

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(wù)的鏈接
URL url = new URL(urlStr);
URLConnection urlCon = url.openConnection();
urlCon.setDoOutput(true);
urlCon.setDoInput(true);
urlCon.setUseCaches(false);
//將xml數(shù)據(jù)發(fā)送到位置服務(wù)
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(wù)端代碼
服務(wù)端一般首先獲取客戶(hù)端發(fā)來(lái)的xml數(shù)據(jù)，進(jìn)行解析，并將響應(yīng)返回給客戶(hù)端：
Java代碼
1. try{
3. //解析對(duì)方發(fā)來(lái)的xml數(shù)據(jù)，獲得EventID節(jié)點(diǎn)的值
5. DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
7. DocumentBuilder db = dbf.newDocumentBuilder();
9. Document d = db.parse(request.getInputStream());
11. String evtid = d.getElementsByTagName("EventID").item(0).getFirstChild().getNodeValue();
13. // System.out.println("evtid" + evtid);
15. //根據(jù)evtid查找任務(wù)，生成xml字符串
17. UfgovDBUtil dbUtil = new UfgovDBUtil();
19. String xmlString = dbUtil.fetchTaskData(evtid);
21. // System.out.println("returned xmlString:" + xmlString);
23. //把xml字符串寫(xiě)入響應(yīng)
25. byte[] xmlData = xmlString.getBytes();
27. response.setContentType("text/xml");
29. response.setContentLength(xmlData.length);
31. ServletOutputStream os = response.getOutputStream();
33. os.write(xmlData);
35. os.flush();
37. os.close();
39. }
41. catch(Exception e){
43. e.printStackTrace();
45. }

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