我找到了答案。诀窍是防止我的Web服务使用包装器设置内容类型：
public class IE8FilterResponseWrapper extends HttpServletResponseWrapper {
public IE8FilterResponseWrapper(HttpServletResponse response) {
super(response);
}
public void forceContentType(String type) {
super.setContentType(type);
}
public void setContentType(String type) {
}
public void setHeader(String name, String value) {
if (!name.equals("Content-Type")) {
super.setHeader(name, value);
}
}
public void addHeader(String name, String value) {
if (!name.equals("Content-Type")) {
super.addHeader(name, value);
}
}
public String getContentType() {
return super.getContentType();
}
}
现在我的过滤器如下所示：
public class IE8Filter implements Filter {
private Logger logger = LoggerHelper.getLogger();
@Override
public void destroy() {}
@Override
public void doFilter(ServletRequest req, ServletResponse res,
FilterChain chain) throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) req;
HttpServletResponse response = (HttpServletResponse) res;
String userAgent = request.getHeader("User-Agent");
logger.debugf("User Agent = '%s'", userAgent);
IE8FilterResponseWrapper wrapper = new IE8FilterResponseWrapper(response);
if (userAgent.contains("MSIE 8") || userAgent.contains("MSIE 7")) {
wrapper.forceContentType("text/html");
chain.doFilter(req, wrapper);
}
else {
chain.doFilter(req, res);
}
}
@Override
public void init(FilterConfig arg0) throws ServletException {}
}
我不确定这是否是打算使用包装器的方式，但确实可行。
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