java - How do I read xml file with a servlet?

Question

I am new to servlet programming. I need to read a xml file from a client using one. How can I do this?

Can anyone refer me to some example code? I'm able to parse xml using jaxb, but how can I get the xml itself from the client?

Answer 1

在这里你可以找到一个示例代码，另见下文。

import java.io.*;
import org.w3c.dom.*;
import javax.servlet.*;
import javax.xml.parsers.*;
import javax.servlet.http.*;

public class ReadXML extends HttpServlet{ 

    public boolean isTextNode(Node n){
        return n.getNodeName().equals("#text");
    }

    public void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException,IOException {
        response.setContentType("text/html");
        PrintWriter out = response.getWriter();

        try{
            DocumentBuilderFactory docFactory =  DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docFactory.newDocumentBuilder();
            Document doc = docBuilder.parse("C:/roseindia.xml");
            out.println("<table border=2><tr><th>Name</th><th>Address</th></tr>");
            Element  element = doc.getDocumentElement(); 
            NodeList personNodes = element.getChildNodes(); 

            for (int i=0; i<personNodes.getLength(); i++){

                 Node emp = personNodes.item(i);
                 if (isTextNode(emp))
                 continue;

                 NodeList NameDOBCity = emp.getChildNodes(); 
                 out.println("<tr>");

                 for (int j=0; j<NameDOBCity.getLength(); j++ ){

                     Node node = NameDOBCity.item(j);
                     if ( isTextNode(node)) 
                     continue;
                    out.println("<td>"+(node.getFirstChild().getNodeValue())+"</td>");

                 } 

                 out.println("</tr>");
             }

             out.println("</table>");

        }

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

Answer 2

学习使用像谷歌这样的搜索引擎，他们有很多关于大多数基本和不那么基本的东西的方便教程

示例：

http://www.tutorialspoint.com/servlets/servlets-file-uploading.htm