如何将页面编码包含到所有jsp页面

Question

I have included <%@ page contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> in one jsp page and it displayed french characters properly. But i want to include the page encoding to all the jsp pages. In web.xml i included

<jsp-config>
      <jsp-property-group>
      <url-pattern>*.jsp</url-pattern>
        <page-encoding>UTF-8</page-encoding>
      </jsp-property-group>
 </jsp-config>

but it will work for tomcat7 i am using tomcat6.

Is there any other solution for this?

Answer 1

You could define a new Filter in your web.xml and modify your answers there.

For example, you could put this in your web.xml :

<filter>
    <filter-name>encoding</filter-name>
    <filter-class>com.example.EncodingFilter</filter-class>
</filter>

<filter-mapping>
    <filter-name>encoding</filter-name>
    <url-pattern>/*.jsp</url-pattern> 
    <!-- or any pattern you like to excluse non-jsp resources -->
</filter-mapping>

And create a com.example.EncodingFilter class like this :

public class EncodingFilter implements javax.servlet.Filter {

    // init, destroy, etc. implementation

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
            throws IOException, ServletException
    {
        response.setCharacterEncoding("utf-8");
        chain.doFilter(request, response); // pass request to next filter
    }
}

You could furthermore add tests around your setCharacterEncoding() call to filter only specific URI or exclude for example a non-HTML jsp or specific parameter, like a JSP outputing PDF if URL paramter format=PDF is provided :

if (!request.getQueryString().contains("format=PDF") {
        response.setCharacterEncoding("utf-8");
}
chain.doFilter(request, response); // pass request to next filter

Answer 2

如果在使用Tomcat时您的参数不是UTF-8编码，请尝试在Tomcat的server.xml中调整Connector配置，如下所示：
<Connector port="8080" maxHttpHeaderSize="8192" maxThreads="150" minSpareThreads="25" maxSpareThreads="75" enableLookups="false" redirectPort="8443" acceptCount="100" connectionTimeout="20000" disableUploadTimeout="true" URIEncoding="UTF-8" />

Answer 3

You can use a meta tag instead of adding page encoding in all the jsp file or in web.xml . If you have a common .jsp file include

Answer 4

Another way is to apply encoding to all pages is using filter.

public void doFilter(ServletRequest request,ServletResponse response, FilterChain filterChain) throws IOException, ServletException {
            request.setCharacterEncoding(encoding);
    //                response.setContentType("text/html;charset=UTF-8");
                    response.setCharacterEncoding(encoding);
            filterChain.doFilter(request, response);

        }

        public void init(FilterConfig filterConfig) throws ServletException {
            String encodingParam = filterConfig.getInitParameter("encoding");
            if (encodingParam != null) {
                encoding = encodingParam;
            }
        }

Register this filter in web.xml