spring 读取web-inf 下资源

当读取web-inf的image或html时，需要用流来输出到页面上，如果用iframe，src里面写上请求路径，而不是直接访问web-inf 下资源；如果iframe里还有其它的src，如<img>标签，也要写上请求路径，controller只写一个能用的即可。代码如下：

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.web.servlet.mvc.AbstractController;
import org.springframework.web.bind.RequestUtils;
import org.springframework.web.servlet.ModelAndView;
import com.avetti.simplemerce.Glob;
public class ShowContentContoller extends AbstractController {
	protected static final Log logger = LogFactory
			.getLog(ShowReportContentContoller.class);
	protected ModelAndView handleRequestInternal(HttpServletRequest request,
			HttpServletResponse response) throws Exception {
		String fileType = RequestUtils.getStringParameter(request, "fileType", "html");
		String vid = RequestUtils.getStringParameter(request, "vid", "");
		String fileName = RequestUtils.getStringParameter(request, "fileName", "");
		String datafile = RequestUtils.getStringParameter(request, "datafile", "");
		String reportid = RequestUtils.getStringParameter(request, "reportid", "");
		
		//file base path
		StringBuffer filePath = new StringBuffer(Glob.reportDir() + "s");
		filePath.append(File.separator).append(vid).append(File.separator);
		
		//display html file
		if (fileType.equalsIgnoreCase("html")) {
			response.setContentType("text/html");
			filePath.append(fileName).append(datafile).append("." + fileType);
		}
		//display image file
		if (fileType.equalsIgnoreCase("image")) {
			response.setContentType("image/png");
			filePath.append("images").append(File.separator).append(datafile).append(reportid).append(File.separator).append(fileName);
		}
	
		if (fileName.length() > 0) {
			 
			File file = new File(filePath.toString());
			if(file.exists()){
				FileInputStream fis = new FileInputStream(file);
				//BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(fis,"UTF-8"));
				byte b[] = new byte[fis.available()];
				fis.read(b);				
				OutputStream os = response.getOutputStream();				
//如果文件比较大，可以多次输出
//				byte[] b = new byte[1024];
//				int len;
//				while((len = fis.read(b))!=-1){
//					os.write(b,0,len);
//				}
				os.write(b);
				os.flush();
				os.close();
				fis.close();
			}
		}
		return null;
	}