动态加载

最新推荐文章于 2025-05-07 14:01:15 发布

nmgfire007

最新推荐文章于 2025-05-07 14:01:15 发布

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分类专栏： WEB开发文章标签： import string exception null input function

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本文介绍了一种使用JavaScript和Servlet实现的动态加载组合框的方法。通过客户端JavaScript函数与服务器端Servlet交互，根据指定的表名、ID字段和名称字段获取数据，并填充到HTML的组合框中。

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servlet :

import java.io.DataInputStream;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.*;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.w3c.dom.Document;
import org.w3c.dom.Element;

public class ComboServlet extends HttpServlet
{

private static final String CONTENT_TYPE = "text/xml; charset=UTF-8";

    public ComboServlet()
    {
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
        throws IOException, ServletException
    {
        try
        {
            response.setContentType("text/xml; charset=UTF-8");
            DocumentBuilderFactory dbfac = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = dbfac.newDocumentBuilder();
            DataInputStream is = new DataInputStream(request.getInputStream());
            Document doc = builder.parse(is);
            String str = doc.getDocumentElement().getAttribute("action");
            Input input = new XmlInput(doc);
            ServletOutputStream out = response.getOutputStream();
            Element el = null;
            if(input.getParameter("__id") != null && !input.getParameter("__id").equals(""))
                el = TableClass.getResult(input.getParameter("__tableName"), new String[] {
                    input.getParameter("__id"), input.getParameter("__name")
                }, new String[] {
                    input.getParameter("__name")
                }, input).toXML(null);
            else
            if(input.getParameter("__tableName").equals("tblpermission"))
                el = TableClass.getResult(input.getParameter("__tableName"), new String[] {
                    "id", "descript"
                }, new String[] {
                    "descript", "id"
                }, input).toXML(null);
            else
                el = TableClass.getResult(input.getParameter("__tableName"), new String[] {
                    "id", "name"
                }, new String[] {
                    "name", "id"
                }, input).toXML(null);
            if(el == null)
                el = builder.newDocument().createElement("Informations");
            StreamResult sr = new StreamResult(out);
            TransformerFactory tf = TransformerFactory.newInstance();
            Transformer t = tf.newTransformer();
            t.setOutputProperty("encoding", "UTF-8");
            DOMSource doms = new DOMSource(el);
            t.transform(doms, sr);
            out.flush();
        }
        catch(Exception ex)
        {
            ex.printStackTrace();
        }
    }