Java,J2EE,Weblogic,Oracle

<%@ page language="java" pageEncoding="GB2312"%>  與
<%@ page contentType="text/html; charset=GB2312" pageEncoding="GB2312" language="java" errorPage=""%>區別:


1.過濾器servlet
public class CharsetFilter
    implements Filter
{

    protected String encoding;
    protected FilterConfig filterConfig;
    protected boolean ignore;

    public CharsetFilter()
    {
        encoding = null;
        filterConfig = null;
        ignore = true;
    }

    public void destroy()
    {
        encoding = null;
        filterConfig = null;
    }

    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
        throws IOException, ServletException
    {
        if(ignore || request.getCharacterEncoding() == null)
        {
            String encoding = selectEncoding(request);
            if(encoding != null)
                request.setCharacterEncoding(encoding);
        }
        chain.doFilter(request, response);
    }

    public void init(FilterConfig filterConfig)
        throws ServletException
    {
        this.filterConfig = filterConfig;
        encoding = filterConfig.getInitParameter("encoding");
        System.out.println("11111111111:"+encoding);
        String value = filterConfig.getInitParameter("ignore");
        if(value == null)
            ignore = true;
        else
        if(value.equalsIgnoreCase("true"))
            ignore = true;
        else
        if(value.equalsIgnoreCase("yes"))
            ignore = true;
        else
            ignore = false;
    }

    protected String selectEncoding(ServletRequest request)
    {
        return encoding;
    }
}

2.在 web.xml 配置
 <filter>
  <filter-name>CharsetFilter</filter-name>
  <filter-class>com.easyjf.web.CharsetFilter</filter-class>
  <init-param>
   <param-name>encoding</param-name>
   <param-value>GB2312</param-value>
  </init-param>
  <init-param>
   <param-name>ignore</param-name>
   <param-value>true</param-value>
  </init-param>
 </filter>
 <filter-mapping>
  <filter-name>CharsetFilter</filter-name>
  <servlet-name>action</servlet-name>
 </filter-mapping>

小結:
在使用<%@ page language="java" pageEncoding="GB2312"%> 顯示的是亂碼。
在使用<%@ page contentType="text/html; charset=GB2312" language="java" pageEncoding="GB2312"%>卻是正常的。


1.jsp :
        <%@ page contentType="text/html; charset=gb2312" language="java">
       <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

2.web.xml中配置 gb2312