A problem with jsp requested parameters in tomcat

I've created a JSP project with netbeans 7.0 and tomcat 7.0 too with no开发者_如何学JAVA problem.

When I export it to a WAR and deploy it into my Tomcat server this line doesn't work:

<% if (request.getParameter("submit").contains("اضافه")) { ...

but these ones works:

<% if (request.getParameter("emplist") != null) { ...

How is this problem caused and how can I solve it?

In TOMCAT_HOME/conf/web.xml, you can add a filter to enable character encoding to UTF-8

Add the following:

<filter>
    <filter-name>setCharacterFilter</filter-name>
    <filter-class>org.apache.catalina.filters.SetCharacterEncodingFilter</filter-class>
    <init-param>
        <param-name>encoding</param-name>
        <param-value>UTF-8</param-value>
        </init-param>
    <init-param>
        <param-name>ignore</param-name>
        <param-value>false</param-value>
        </init-param>
</filter>
<filter-mapping>
    <filter-name>setCharacterFilter</filter-name>
    <url-pattern>*</url-pattern>
</filter-mapping>

If you want to URL to be encoded to include UTF-8, you will have to add a URIEncoding="UTF-8" to your Tomcat Connector.

Find your HTTP connector (in TOMCAT_HOME/conf/server.xml, usually you can find a port 8080 assigned) and add the attribute URIEncoding as above, as follows:

<Connector port="8080" maxHttpHeaderSize="8192"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               connectionTimeout="20000" disableUploadTimeout="true"
               URIEncoding="UTF-8"
    />

I hope this helps.

Is your deployment tomcat version same as your development one ?

This might be related to request encoding problem . you should set encoding to UTF-8 either by calling the setCharacterEncoding of HttpServletRequest object or by setting utf8 charset in your form .

Like following. You also can create the custom filter class to set the encoding of the request to UTF-8

public class UnicodeFilter implements Filter {

    public void doFilter(ServletRequest req, ServletResponse res,
        FilterChain chain) throws IOException, ServletException {

        req.setCharacterEncoding("UTF-8");

        chain.doFilter(req, res);
   }
   public void init(FilterConfig config) throws ServletException {
     //Get init parameter
   }
   public void destroy() {
     //add code to release any resource
   }
}