java 后台返回文件流到浏览器

package com.springbootblog.controller;import io.swagger.annotations.ApiImplicitParam;import io.swagger.annotations.ApiImplicitParams;import io.swagger.annotations.ApiOperation;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.RequestMethod;import org.springframework.web.bind.annotation.ResponseBody;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.*;/** *@title : JavaClass  *@author:zyh *@createDate:2018/9/13 21:46 * **/@RequestMapping(value = "/queryImg")@Controllerpublic class ReadImgController {    @ApiOperation(value = "img", produces = "application/json")    @ApiImplicitParams({    })    @RequestMapping(value = "/img",method = RequestMethod.POST)    @ResponseBody    public void getImage(String path, HttpServletRequest request, HttpServletResponse response) {        try {            String url="D:\\temp-appImg\\20180912\\7cd2e1a3-a087-4e25-aac8-2bdf8e274c6f.png";            File file = new File(url);            String l=request.getRealPath("/")+"/"+url;            String filename = file.getName();            InputStream fis = new BufferedInputStream(new FileInputStream(file));            byte[] buffer = new byte[fis.available()];            fis.read(buffer);            fis.close();            response.reset();            // 设置response的Header            response.addHeader("Content-Length", "" + file.length());            response.setContentType("image/jpg");            OutputStream toClient = new BufferedOutputStream(response.getOutputStream());            toClient.write(buffer);            toClient.flush();            toClient.close();        } catch (IOException ex) {            ex.printStackTrace();        }        //return response;    }    @ApiOperation(value = "img", produces = "application/json")    @ApiImplicitParams({    })    @RequestMapping(value = "/imgRes",method = RequestMethod.POST)    @ResponseBody    public HttpServletResponse  getImageRes(String path, HttpServletRequest request, HttpServletResponse response) {        try {            String url="D:\\temp-appImg\\20180912\\7cd2e1a3-a087-4e25-aac8-2bdf8e274c6f.png";            File file = new File(url);            String l=request.getRealPath("/")+"/"+url;            String filename = file.getName();            InputStream fis = new BufferedInputStream(new FileInputStream(file));            byte[] buffer = new byte[fis.available()];            fis.read(buffer);            fis.close();            response.reset();            // 设置response的Header            response.addHeader("Content-Length", "" + file.length());            response.setContentType("image/png");            OutputStream toClient = new BufferedOutputStream(response.getOutputStream(),888888);            toClient.write(buffer);            toClient.flush();            toClient.close();        } catch (IOException ex) {            ex.printStackTrace();        }        return response;    }    @ApiOperation(value = "返回指定地址的文件流1")    @ApiImplicitParams({            @ApiImplicitParam(name = "url", value = "图片地址", required = true,                    paramType = "query", defaultValue = "\\20180912\\7cd2e1a3-a087-4e25-aac8-2bdf8e274c6f.png"),    })    @RequestMapping(value = "/noLogin/readImageFile1", method = RequestMethod.POST)    @ResponseBody    public void getUrlFile(String url, HttpServletRequest request, HttpServletResponse response) {        String serverUrl = "D:\\temp-appImg\\";        String imgUrl = serverUrl + url;        File file = new File(imgUrl);        // 后缀名        String suffixName = url.substring(url.lastIndexOf("."));        String imgType = "image/" + suffixName;        //判断文件是否存在如果不存在就返回默认图标        if (!(file.exists() && file.canRead())) {            file = new File(request.getSession().getServletContext().getRealPath("/")                    + "resource/icons/auth/root.png");        }        FileInputStream inputStream = null;        try {            inputStream = new FileInputStream(file);            byte[] data = new byte[(int) file.length()];            int length = inputStream.read(data);            inputStream.close();            //setContentType("text/plain; charset=utf-8"); 文本            response.setContentType(imgType + ";charset=utf-8");            OutputStream stream = response.getOutputStream();            stream.write(data);            stream.flush();            stream.close();        } catch (FileNotFoundException e) {            e.printStackTrace();        } catch (IOException e) {            e.printStackTrace();        }    }}