问题描述

关于tomcat 报错原因

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

java.lang.ClassCastException: com.sany.web.session.WebSession cannot be cast to java.lang.String
com.sany.web.filter.SetCharacterEncodingFilter.doFilter(SetCharacterEncodingFilter.java:34)》<!--->

note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.

/**

• */
  package com.sany.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

import com.sany.util.log.ILogger;

public class SetCharacterEncodingFilter implements Filter {
private static final ILogger logger = ILogger.getInstance().getILogger(SetCharacterEncodingFilter.class);
public void init(FilterConfig arg0) throws ServletException {
// TODO Auto-generated method stub

}

public void doFilter(ServletRequest request, ServletResponse response, FilterChain fileter) throws IOException, ServletException {
    // TODO Auto-generated method stub
    request.setCharacterEncoding("GBK");
    HttpServletRequest req = (HttpServletRequest) request;

// response.setCharacterEncoding("GBK");
try{
fileter.doFilter(request, response);

}
catch(Exception e){
logger.error((String)req.getSession().getAttribute("user"),"doFilter(ServletRequest request=" + request
+ ", ServletResponse response=" + response
+ ") - [方法错误]", e);

        e.printStackTrace();
    }
}
public void destroy() {
    // TODO Auto-generated method stub

}

}

解决方案

com.sany.web.session.WebSession cannot be cast to java.lang.String
类型转换错误 应该用WebSession接的你用的是String
错误在etCharacterEncodingFilter.java:34

解决方案二：

 (String)(req.getSession().getAttribute("user"))