上传图片接口    图片保存到服务器(适用于任何文件)

/** * 上传医生照片 * @param request * @return * @throws Exception * @throws IOException */@RequestMapping(value = "uploadfile")public Object uploadfile(HttpServletRequest request) throws Exception, IOException {    MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;    String logoPathDir = fileConfig.getPersonImageURL();   //从配置文件中获取服务器保存路径    // 根据真实路径创建目录    File logoSaveFile = new File(logoPathDir);    if (!logoSaveFile.exists()){        logoSaveFile.mkdirs();    }    // 页面控件的文件流    MultipartFile multipartFile = multipartRequest.getFile("file");    // 获取文件的后缀    String suffix = multipartFile.getOriginalFilename().substring(            multipartFile.getOriginalFilename().lastIndexOf("."));    // 使用UUID生成文件名称    String logImageName = UUID.randomUUID().toString() + suffix;// 构建文件名称    // 拼成完整的文件保存路径加文件    String fileName = logoPathDir + logImageName;    File file = new File(fileName);    try {        multipartFile.transferTo(file);    } catch (IllegalStateException e) {        e.printStackTrace();    } catch (IOException e) {        e.printStackTrace();    }    // 打印出上传到服务器的文件的绝对路径    Map<String, Object> result=new HashMap<String, Object>();    result.put("imgname", logImageName);    result.put("imgnamepath", fileName);    result.put("message", "上传成功");    result.put("statu", 1);    return result;}

第二种写法  io流

/** * 上传版本文件 * @param request * @param response * @return * @throws Exception * @throws IOException */@RequestMapping(value = "uploadfiledemo")public Object uploadfiledemo(HttpServletRequest request,MultipartHttpServletRequest multiReq,HttpServletResponse response) throws Exception, IOException {    // 获取上传文件的路径    String uploadFilePath = multiReq.getFile("file").getOriginalFilename();    // 截取上传文件的后缀    String uploadFileSuffix = uploadFilePath.substring(            uploadFilePath.lastIndexOf("."));    // 使用UUID生成文件名称    String filename = UUID.randomUUID().toString() + uploadFileSuffix;// 构建文件名称    FileOutputStream fos = null;    FileInputStream fis = null;    try {        fis = (FileInputStream) multiReq.getFile("file").getInputStream();        fos = new FileOutputStream(new File(fileConfig.getAppFileURL() + filename));        byte[] temp = new byte[1024];        int i = fis.read(temp);        while (i != -1) {            fos.write(temp, 0, temp.length);            fos.flush();            i = fis.read(temp);        }    } catch (IOException e) {        e.printStackTrace();    } finally {        if (fis != null) {            try {                fis.close();            } catch (IOException e) {                e.printStackTrace();            }        }        if (fos != null) {            try {                fos.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    // 打印出上传到服务器的文件的绝对路径    Map<String, Object> result=new HashMap<String, Object>();    result.put("appFileName", filename);//文件名称    result.put("appFilePath", fileConfig.getAppFileURL() + filename);//文件带路径的名称    result.put("message", "上传成功");    result.put("statu", 1);    return result;}

------------------------------------------------------------------------------------------------------------------------------------------图片预览接口  不需return   将文件流输出即可

/** * 传入要预览的图片名称 * * @param path */@RequestMapping(value = "/downloadpicture")private void downloadPicture(String path, HttpServletResponse response) throws IOException {    //获取文件保存路径    String logoPathDir = fileConfig.getPersonImageURL();        path = logoPathDir + path;         //获取服务器上指定的图片路径    InputStream in = null;    ServletOutputStream sos = null;    try {        File file = new File(path);        in = new FileInputStream(file);        sos = response.getOutputStream();        byte[] b = new byte[1024];        while (in.read(b) != -1) {sos.write(b);    //输出        }        sos.flush();           //刷新    } catch (Exception e) {        e.printStackTrace();    } finally {        try {            in.close();        //关闭文件读取流，输出流            sos.close();        } catch (IOException e) {            e.printStackTrace();        }    }}

---------------------------------------------------------------------------------------------------------------------------------------

文件下载  保存到本地 需要设置文件头，后缀名等信息  无法使用  文件需要使用FileInputStream

/**
* 传入要下载的app文件的url，将url所对应的文件下载到本地
*
* @param path
*/
@RequestMapping(value = "/downloadappfile")
private void downloadappfile(@RequestParam(value="appFileName",defaultValue="")String path,HttpServletResponse response) throws IOException {
//获取文件保存路径
String logoPathDir = fileConfig.getAppFileURL();
path = logoPathDir + path;
InputStream in = null;
ServletOutputStream sos = null;
try {
File file = new File(path);
response.setCharacterEncoding("utf-8");
//设置Content-Disposition
response.setHeader("Content-Disposition", "attachment;filename="+file.getName());
//设置文件MIME类型
response.setContentType(new MimetypesFileTypeMap().getContentType(file));

in = new FileInputStream(file);
sos = response.getOutputStream();
byte[] b = new byte[1024];
while (in.read(b) != -1) {
sos.write(b);
}
sos.flush();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
in.close();
sos.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

第二种写法  使用BufferedInputStream改善读取性能

 /**     * 传入要下载的app文件的url，将url所对应的文件下载到本地     * @param path     */    @RequestMapping(value = "/downloadappfiledemo")    private void downloadappfiledemo(@RequestParam(value="appFileName",defaultValue="")String path,HttpServletResponse response) throws IOException {        //获取文件保存路径        String logoPathDir = fileConfig.getAppFileURL();        path = logoPathDir + path;response.setHeader("content-type", "application/octet-stream");response.setContentType("application/octet-stream");byte[] buff = new byte[1024];BufferedInputStream bis = null;OutputStream os = null;try {    File file = new File(path);    response.setHeader("Content-Disposition", "attachment;filename=" + file.getName());os = response.getOutputStream();bis = new BufferedInputStream(new FileInputStream(file));int i = bis.read(buff);while (i != -1) {  os.write(buff, 0, buff.length);os.flush();i = bis.read(buff);}} catch (IOException e) {e.printStackTrace();} finally {try {bis.close();} catch (IOException e) {e.printStackTrace();}}

    }

InputStream不可以读取文件，它是一个Abstract的类，根本不可能实例化，是所有输入流的基类。而FileInputStream是InputStream的一个实现类，用于读取诸如图像数据之类的原始字节流。第三种写法write的flush，是想要不关闭write流的情况下，将已写入缓存的内容发出去。read只是读操作，没有flush。out不关，是因为out来自socket，socket关了，就不用再关一次out了

/** * 传入要下载的app文件的url，将url所对应的文件下载到本地 * @param path */@RequestMapping(value = "/downloadappfile")private Object downloadappfile(@RequestParam(value="appFileName",defaultValue="")String path,HttpServletResponse response) throws IOException {    //获取文件保存路径    String logoPathDir = fileConfig.getAppFileURL();    path = logoPathDir + path;    File file = new File(path);    //如果文件不存在    if(!file.exists()){        return new Response("999999","系统找不到指定文件");    }    response.reset(); // 必要地清除response中的缓存信息    response.setContentType("application/octet-stream; charset=utf-8");    response.setCharacterEncoding("utf-8");  // 设置response的Header    response.setHeader("Content-Disposition", "attachment;filename="+file.getName());    response.addHeader("Content-Length", "" + file.length());   //设置请求头信息写入文件大小    FileInputStream fis = null;    BufferedInputStream bis = null;    try {        fis = new FileInputStream(file);        byte[] buffer = new byte[1024];        bis = new BufferedInputStream(fis);        OutputStream os=response.getOutputStream();        int i = bis.read(buffer);        while (i != -1) {            os.write(buffer, 0, i);            i = bis.read(buffer);        }    } catch (Exception e) {        e.printStackTrace();    } finally {        if (bis != null) {            try {                bis.close();            } catch (IOException e) {                e.printStackTrace();            }        }        if (fis != null) {            try {                fis.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    return null;}

------------------------------------------------------------------------------------------------------------------

多文件上传

public static String upload(HttpServletRequest request, String DirectoryName) throws IllegalStateException,
IOException {
// 创建一个通用的多部分解析器
CommonsMultipartResolver multipartResolver = new CommonsMultipartResolver(request.getSession()
.getServletContext());
// 图片名称
String fileName = null;
// 判断 request 是否有文件上传,即多部分请求
if (multipartResolver.isMultipart(request)) {
// 转换成多部分request
MultipartHttpServletRequest multiRequest = (MultipartHttpServletRequest) request;
// 取得request中的所有文件名
Iterator<String> iter = multiRequest.getFileNames();
while (iter.hasNext()) {
// 记录上传过程起始时的时间，用来计算上传时间
// int pre = (int) System.currentTimeMillis();
// 取得上传文件
MultipartFile file = multiRequest.getFile(iter.next());
if (file != null) {
// 取得当前上传文件的文件名称
String myFileName = file.getOriginalFilename();
// 如果名称不为“”,说明该文件存在，否则说明该文件不存在
if (myFileName.trim() != "") {
// 获得图片的原始名称
String originalFilename = file.getOriginalFilename();
// 获得图片后缀名称,如果后缀不为图片格式，则不上传
String suffix = originalFilename.substring(originalFilename.lastIndexOf(".")).toLowerCase();
if (!fileTypes.contains(suffix)) {
continue;
}
// 获得上传路径的绝对路径地址(/upload)-->
String realPath = request.getSession().getServletContext().getRealPath("/" + DirectoryName);
System.out.println(realPath);
// 如果路径不存在，则创建该路径
File realPathDirectory = new File(realPath);
if (realPathDirectory == null || !realPathDirectory.exists()) {
realPathDirectory.mkdirs();
}
// 重命名上传后的文件名 111112323.jpg
fileName = UUID.randomUUID().toString() + suffix;// 构建文件名称
// 定义上传路径 .../upload/111112323.jpg
File uploadFile = new File(realPathDirectory + "\\" + fileName);
System.out.println(uploadFile);
file.transferTo(uploadFile);
}
}
// 记录上传该文件后的时间
// int finaltime = (int) System.currentTimeMillis();
// System.out.println(finaltime - pre);
}
}
return fileName;
}

------------------------------------------------------------------------------------------------------------------------------------------