一、图片由一台服务器传至另一台服务器(FTP):
1.图片上传
Image img = ImageIO.read(multipartFile.getInputStream()); //multipartFile为上传的多文件中的其中一个
if (img == null || img.getWidth(null) <= 0 || img.getHeight(null) <= 0) { return new String[]{};} //判断文件是否为图片
if (!FtpUtils.uploadFile(filePath,multipartFile.getInputStream())){ return new String[]{};} //使用ftp上传文件,filePath 为上传路径，FtpUtils.uploadFile 为FTP上传文件方法
double size = multipartFile.getInputStream().available();//获取图片大小
size = (size/(double)1024)/(double)1024;if (size > 10){ return new String[]{};} //限制文件大小size为MB单位
2.缩略图上传
Image image = ImageIO.read(multipartFile.getInputStream());
int width=image.getWidth(null); //获取原图宽度
int height=image.getHeight(null);//获取原图高度
int wrate=width/200; //宽度缩略图
int hrate=height/200;//高度缩略图
int rate=0;
if (wrate>hrate) { rate=wrate;}//宽度缩略图比例大于高度缩略图，使用宽度缩略图
else { rate=hrate;}
if (rate == 0){ rate = 1;} //若原图过小，则按照原图大小存储
//计算缩略图最终的宽度和高度
int newWidth=width/rate;
int newHeight=height/rate;
BufferedImage bufferedImage=new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
//图片缩略图实现
bufferedImage.getGraphics().drawImage(image.getScaledInstance(newWidth, newHeight, image.SCALE_SMOOTH), 0, 0, null);//*image/jpeg
String imageType=multipartFile.getContentType().substring(multipartFile.getContentType().indexOf("/")+1); //获取图片类型
ByteArrayOutputStream os = new ByteArrayOutputStream(); //字节输出流
ImageIO.write(bufferedImage, imageType,os); //将缩略图字节写入到os 中
InputStream thuis = new ByteArrayInputStream(os.toByteArray()); //转换为输入流
if (!FtpUtils.uploadFile(thumbnailPath,thuis)){ return new String[]{};} //上传ftp
3.FtpUtils工具类
public static boolean uploadFile(String fileName,InputStream in){
boolean success =false;
try{
ftp.connect(URL,PORT); //；连接
ftp.login(USERNAME,PASSWORD); //登录
int reply =ftp.getReplyCode(); //返回码
if (!FTPReply.isPositiveCompletion(reply)) //连接失败
{
ftp.disconnect();
return false;
}
ftp.setControlEncoding("UTF-8");
ftp.setFileType(FTPClient.BINARY_FILE_TYPE);
ftp.enterLocalPassiveMode();
ftp.storeFile(fileName,in);
ftp.changeWorkingDirectory("/image/");//修改保存图片的文件夹,为绝对路径,'/'为FTP根目录,image为根目录下文件夹
in.close();
ftp.logout();
success =true;
}catch (Exception e){
e.printStackTrace();
}finally {
disConnection();
}
return success;
}
4.代码
protected String[] upload(HttpServletRequest request)throws IOException {
String filePaths="";
String thumbnailPaths="";
//创建一个通用的多部分解析器
CommonsMultipartResolver multipartResolver =new CommonsMultipartResolver(request.getSession().getServletContext());
//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 iter = multiRequest.getFileNames();
while(iter.hasNext()){
List multipartFiles = multiRequest.getFiles(iter.next());
String basePath ="保存图片的绝对路径";
for (MultipartFile multipartFile : multipartFiles){
if(ArrayUtils.contains(contentTypes,multipartFile.getContentType())){
String fileName = multipartFile.getOriginalFilename();
if (StringUtils.isNotEmpty(fileName)){
fileName=fileName.substring(fileName.lastIndexOf("."));
Image img = ImageIO.read(multipartFile.getInputStream());
if (img ==null || img.getWidth(null) <=0 || img.getHeight(null) <=0) {return new String[]{};}
double size = multipartFile.getInputStream().available();
size = (size/(double)1024)/(double)1024;
if (size >10){return new String[]{};}
String filePath= '自命名';
filePaths += basePath + filePath +"|";
String thumbnailPath= '自命名';
InputStream is=multipartFile.getInputStream();
if (!FtpUtils.getInstance(FtpUtils.TYPE_ACTIVE).uploadFile(filePath,multipartFile.getInputStream())){
return new String[]{};}
//缩略图
Image image = ImageIO.read(multipartFile.getInputStream());
int width=image.getWidth(null);//获取原图宽度
int height=image.getHeight(null);//获取原图高度
int wrate=width/200;//宽度缩略图
int hrate=height/200;//高度缩略图
int rate=0;
if (wrate>hrate) {//宽度缩略图比例大于高度缩略图，使用宽度缩略图
rate=wrate;}else {rate=hrate;}
if (rate ==0){rate =1;}
//计算缩略图最终的宽度和高度
int newWidth=width/rate;
int newHeight=height/rate;
BufferedImage bufferedImage=new BufferedImage(newWidth, newHeight, BufferedImage.TYPE_INT_RGB);
//图片缩略图实现
bufferedImage.getGraphics().drawImage(image.getScaledInstance(newWidth, newHeight, image.SCALE_SMOOTH),0,0,null);
//*image/jpeg
String imageType=multipartFile.getContentType().substring(multipartFile.getContentType().indexOf("/")+1);
ByteArrayOutputStream os =new ByteArrayOutputStream();
ImageIO.write(bufferedImage, imageType,os);
InputStream thuis =new ByteArrayInputStream(os.toByteArray());
if (!FtpUtils.getInstance(FtpUtils.TYPE_ACTIVE).uploadFile(thumbnailPath,thuis)){
return new String[]{};}
thumbnailPaths += basePath + thumbnailPath +"|";
}}}}}
filePaths=filePaths.length()>1?filePaths.substring(0,filePaths.length()-1):filePaths;
thumbnailPaths=thumbnailPaths.length()>1?thumbnailPaths.substring(0,thumbnailPaths.length()-1):thumbnailPaths;
return new String[]{filePaths,thumbnailPaths};}