spring使用流读取指定路径图片

//流读取图片

package cn.fenghuait.controller;

import java.io.FileInputStream;
import java.util.Map;

import javax.servlet.ServletOutputStream;
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.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import cn.fenghuait.service.SysParameterService;

@Controller
@RequestMapping("/picture")
public class ShowPicController extends BaseController{
private static Log logger = LogFactory.getLog(ShowPicController.class);
@Autowired
private SysParameterService parameterService;

@RequestMapping(value="/showPic")
public @ResponseBody Map<String,Object> showPic(HttpServletRequest request,HttpServletResponse response) throws Exception{
    try{
      String basePath = parameterService.getProblemPic();
      String str = request.getParameter("picName");
        String realName = basePath+"/"+str;
        FileInputStream fs = new FileInputStream(realName);
        int b=fs.available(); //得到文件大小
        byte data[]=new byte[b];
        fs.read(data); //读数据
        response.setContentType("image/*"); //设置返回的文件类型
        ServletOutputStream toClient=response.getOutputStream(); //得到向客户端输出二进制数据的对象
        toClient.write(data); //输出数据
        toClient.flush();
        toClient.close();
        fs.close();
    }catch(Exception e){
      e.printStackTrace();
      logger.error(e);
    }
    return null;

}
}

//查询图片名称

info=problemInfoService.getProblemInfoById(problemInfo.getProblemId());
       List<String> list = new ArrayList<String>();
       if(info.getPicturePath()!=null&&!"".equals(info.getPicturePath().trim())){
       String str = info.getPicturePath();
       String[] strs = str.split(",");
       String pic = "";
       for(int i = 0;i<strs.length;i++){
          pic = strs[i];
         list.add(pic);
       }
       }
       mav.addObject("problem", info);
       mav.addObject("realName", list);

//jsp显示图片

<c:forEach items="${realName }" var="item">

spring使用流读取指定路径图片

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