如何从应用程序级别设置 tomcat 的轻松查询字符

Question

Allowing special characters in request URL is possible in tomcat_folder/conf/server.xml as far as I know, but I am somewhat required to find another way to set these special characters from the application side (if it is possible), I mean using web.xml or any other way. Here, I have enabled "[" (opening square bracket) and "]" (closing square bracket) in the query:

    <Connector port="8080" protocol="HTTP/1.1" relaxedQueryChars='|[]'
           connectionTimeout="20000"
           redirectPort="8443"
           URIEncoding="UTF-8"/>

This works pretty fine and I would appreciate it if anyone can help me to set without touching server.xml.

Info about the application environment: Tomcat version: 7.0.96, Spring: 4.1.7.RELEASE

Answer 1

I agree with @M.Deinum .

It is not recommended to touch server.xml of the tomcat using java code as it can stop other application from working properly.

But still you want to do, you can take the risk.

Sample Java code:

import java.io.File;
import java.util.Arrays;
import java.util.List;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
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.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class RelaxedQueryCharsExample {

    public static void main(String[] args)
            throws ParserConfigurationException, SAXException, TransformerException {

        DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
        DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
        File file = new File("D:/tomcat/conf/server.xml");
        Document document = documentBuilder.parse(file);
        NodeList list = document.getElementsByTagName("Connector");
        for (int i = 0; i < list.getLength(); i++) {
            Node node = list.item(i);
            NamedNodeMap map = node.getAttributes();
            if (map.getNamedItem("port").getNodeValue().equalsIgnoreCase("8080") 
      && map.getNamedItem("protocol").getNodeValue().equalsIgnoreCase("HTTP/1.1")) {
                map.getNamedItem("relaxedQueryChars").setNodeValue("|[]");
            }

        }

        TransformerFactory tf = TransformerFactory.newInstance();
        Transformer transformer = tf.newTransformer();
        document.setXmlStandalone(true);
        DOMSource source = new DOMSource(document);
        StreamResult result = new StreamResult(file);
        transformer.transform(source,result);
    }

}

Note: Run this code before running tomcat server. In between running this may crash the server.