通过http请求传递xml流和接收xml流的代码示例

//1.在servlet中post一个xml流：
import java.io.OutputStreamWriter;
import org.jdom.Document;
import org.jdom.Document;

public void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
//do somthing...
response.setContentType("application/xml");
Document doc = createDoc();
    String strdoc = new XMLOutputter().outputString(doc);
    OutputStreamWriter out = new OutputStreamWriter(response
      .getOutputStream(), "UTF-8");
    out.write(strdoc);
    out.flush();
    out.close();
//do somthing...
}

/***
*将要封装的数据，封装为xml文件的Document格式
*/
public Document createDoc() {
   Document doc = null;
   Element root;
   Element viewentry;
   Element entry;
   List list = getData();
   try {
    XMLOutputter docWriter = new XMLOutputter(" ", true);
    docWriter.setEncoding("UTF-8");
    root = new Element("your_element_name");
    doc = new Document(root);
    root = doc.getRootElement();
    if (list == null || list.size() == 0) {
     return doc;
    }
    Iterator it = list.iterator();
    while (it.hasNext()) {
     Map colMap = (Map) it.next();

     viewentry = new Element("document");
     entry = new Element("author");
     entry.setText(colMap.get("userid").toString());
     viewentry.addContent(entry);

                                //do other entry in this way
     root.addContent(viewentry);
    }
   } catch (Exception e) {
    e.printStackTrace();
   }
   return doc;
}

//2.根据接收的url，从其中获取xml流生成xml文件
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.io.SAXReader;

import sun.net.www.protocol.http.HttpURLConnection;

public static Document getDocument(String url){
  
   Document doc = null;
   HttpURLConnection conn = null;
   InputStream ins = null;
   SAXReader reader = null;
   try{
    HttpTimeoutHandler hth = new HttpTimeoutHandler(600000);
    URL conURL = new URL(null,url,hth);
    conn = (HttpURLConnection)conURL.openConnection();
    conn.setDoInput(true);
    conn.setDoOutput(true);
    conn.setUseCaches(false);
    ins = conn.getInputStream();
    reader =new SAXReader();
    doc= reader.read(ins);
    ins.close();
    conn.disconnect();
   }catch (MalformedURLException e) {
    e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();   
   } catch (DocumentException e) {
    e.printStackTrace();
   }catch(Exception e){
    e.printStackTrace();
   }finally {
    try {
     if (ins != null) {
      ins.close();
      ins = null;
     }
    } catch (IOException e1) {
     e1.printStackTrace();
    }
    try {
     if (conn != null) {
      conn.disconnect();
      conn = null;
     }
    } catch (Exception e2) {
     e2.printStackTrace();
    }
   }
   return doc;
}

3.//处理url超时限制
/***
HttpTimeoutHandler.java
*/
import java.net.*;
import java.io.IOException;

public class HttpTimeoutHandler extends sun.net.www.protocol.http.Handler {
int intTimeoutVal;
HttpURLConnectionTimeout fHUCT;

public HttpTimeoutHandler(int iT) {
   intTimeoutVal = iT;
}

protected java.net.URLConnection openConnection(URL u) throws IOException {
   return fHUCT = new HttpURLConnectionTimeout(u, this, intTimeoutVal);
}

String GetProxy() {
   return proxy;
} // breaking encapsulation

int GetProxyPort() {
   return proxyPort;
} // breaking encapsulation

public void Close() throws Exception {
   fHUCT.Close();
}

public Socket GetSocket() {
   return fHUCT.GetSocket();
}
}