一，接口已经写死
public static String upload(String appCode, MultipartFile inputFile)
public static String upload(String appCode, File inputFile)
后台已经写死成这两种格式了
MultipartFile inputFile = multipartRequest.getFile(fileElementId);
CommonsMultipartFile cf= (CommonsMultipartFile)inputFile;
DiskFileItem fi = (DiskFileItem)cf.getFileItem();
String storeLocation = fi.getStoreLocation().toString();
originalFilename = inputFile.getOriginalFilename();
imageType = originalFilename.substring(originalFilename.lastIndexOf(".") + 1).trim().toLowerCase();
long sizeOther = inputFile.getSize();
size = sizeOther +"kb";
double scale = 1.0d ;
if(sizeOther >= 3*1024*1024){
if(sizeOther > 0){
scale = (3*1024*1024f) / sizeOther ;
}
Thumbnails.of(inputFile.getInputStream()).scale(1f).outputQuality(scale).outputFormat("jpg").toFile(storeLocation);
File file = new File(storeLocation+".jpg");
fssId = FssFileClient.upload("app-weixin", file);
file.delete();
}else{
fssId = FssFileClient.upload("app-weixin", inputFile);
}
StoreLocation=/opt/oracle/tomcat/t-2/work/Catalina/localhost/weixin/upload_6af40051_15fc4efb752__7ffd_00000001.tmp
StoreLocation=D:\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp5\work\Catalina\localhost\weixin\upload__ad6bac5_15fc4f98fa1__8000_00000000.tmp
去找到这个路径，因为在这个路径下会产生一个缓存文件，对这个缓存文件进行压缩，压缩完了之上传，上传至后在删除。
二，就是自己创建一个文件，然后在进行修改
MultipartFile inputFile = multipartRequest.getFile(fileElementId);
originalFilename = inputFile.getOriginalFilename();
imageType = originalFilename.substring(originalFilename.lastIndexOf(".") + 1).trim().toLowerCase();
long sizeOther = inputFile.getSize();
size = sizeOther +"kb";
double scale = 1.0d ;
if(sizeOther >= 3*1024*1024){
if(sizeOther > 0){
scale = (3*1024*1024f) / sizeOther ;
}
String path=request.getSession().getServletContext().getRealPath("/")+"js" + System.getProperty("file.separator") + "upload"+System.getProperty("file.separator")+"yasuo."+imageType;
Thumbnails.of(inputFile.getInputStream()).scale(1f).outputQuality(scale).toFile(path);
File file = new File(path);
fssId = FssFileClient.upload("app-weixin", file);
}else{
fssId = FssFileClient.upload("app-weixin", inputFile);
}
自己创建了一个upload的文件，在这个里面进行修改。
三，详细的 讲解
<!-- 图片缩略图 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.8</version>
</dependency>
3.1，按指定大小把图片进行缩放（会遵循原图高宽比例）
//按指定大小把图片进行缩和放（会遵循原图高宽比例）
//此处把图片压成400×500的缩略图
Thumbnails.of(fromPic).size(400,500).toFile(toPic);//变为400*300,遵循原图比例缩或放到400*某个高度
3.2，按照指定比例进行缩小和放大
//按照比例进行缩小和放大
Thumbnails.of(fromPic).scale(0.2f).toFile(toPic);//按比例缩小
Thumbnails.of(fromPic).scale(2f);//按比例放大
图片尺寸不变，压缩图片文件大小
//图片尺寸不变，压缩图片文件大小outputQuality实现,参数1为最高质量
Thumbnails.of(fromPic).scale(1f).outputQuality(0.25f).toFile(toPic);
我这里只使用了 图片尺寸不变，压缩文件大小 源码
/**
*
* @Description:保存图片并且生成缩略图
* @param imageFile 图片文件
* @param request 请求对象
* @param uploadPath 上传目录
* @return
*/
public static BaseResult uploadFileAndCreateThumbnail(MultipartFile imageFile,HttpServletRequest request,String uploadPath) {
if(imageFile == null ){
return new BaseResult(false, "imageFile不能为空");
}
if (imageFile.getSize() >= 10*1024*1024)
{
return new BaseResult(false, "文件不能大于10M");
}
String uuid = UUID.randomUUID().toString();
String fileDirectory = CommonDateUtils.date2string(new Date(), CommonDateUtils.YYYY_MM_DD);
//拼接后台文件名称
String pathName = fileDirectory + File.separator + uuid + "."
+ FilenameUtils.getExtension(imageFile.getOriginalFilename());
//构建保存文件路劲
//2016-5-6 yangkang 修改上传路径为服务器上
String realPath = request.getServletContext().getRealPath("uploadPath");
//获取服务器绝对路径 linux 服务器地址 获取当前使用的配置文件配置
//String urlString=PropertiesUtil.getInstance().getSysPro("uploadPath");
//拼接文件路劲
String filePathName = realPath + File.separator + pathName;
log.info("图片上传路径："+filePathName);
//判断文件保存是否存在
File file = new File(filePathName);
if (file.getParentFile() != null || !file.getParentFile().isDirectory()) {
//创建文件
file.getParentFile().mkdirs();
}
InputStream inputStream = null;
FileOutputStream fileOutputStream = null;
try {
inputStream = imageFile.getInputStream();
fileOutputStream = new FileOutputStream(file);
//写出文件
//2016-05-12 yangkang 改为增加缓存
// IOUtils.copy(inputStream, fileOutputStream);
byte[] buffer = new byte[2048];
IOUtils.copyLarge(inputStream, fileOutputStream, buffer);
buffer = null;
} catch (IOException e) {
filePathName = null;
return new BaseResult(false, "操作失败", e.getMessage());
} finally {
try {
if (inputStream != null) {
inputStream.close();
}
if (fileOutputStream != null) {
fileOutputStream.flush();
fileOutputStream.close();
}
} catch (IOException e) {
filePathName = null;
return new BaseResult(false, "操作失败", e.getMessage());
}
}
// String fileId = FastDFSClient.uploadFile(file, filePathName);
/**
* 缩略图begin
*/
//拼接后台文件名称
String thumbnailPathName = fileDirectory + File.separator + uuid + "small."
+ FilenameUtils.getExtension(imageFile.getOriginalFilename());
//added by yangkang 2016-3-30 去掉后缀中包含的.png字符串
if(thumbnailPathName.contains(".png")){
thumbnailPathName = thumbnailPathName.replace(".png", ".jpg");
}
long size = imageFile.getSize();
double scale = 1.0d ;
if(size >= 200*1024){
if(size > 0){
scale = (200*1024f) / size ;
}
}
//拼接文件路劲
String thumbnailFilePathName = realPath + File.separator + thumbnailPathName;
try {
//added by chenshun 2016-3-22 注释掉之前长宽的方式，改用大小
// Thumbnails.of(filePathName).size(width, height).toFile(thumbnailFilePathName);
if(size < 200*1024){
Thumbnails.of(filePathName).scale(1f).outputFormat("jpg").toFile(thumbnailFilePathName);
}else{
Thumbnails.of(filePathName).scale(1f).outputQuality(scale).outputFormat("jpg").toFile(thumbnailFilePathName);
}
} catch (Exception e1) {
return new BaseResult(false, "操作失败", e1.getMessage());
}
/**
* 缩略图end
*/
Map<String, Object> map = new HashMap<String, Object>();
//原图地址
map.put("originalUrl", pathName);
//缩略图地址
map.put("thumbnailUrl", thumbnailPathName);
return new BaseResult(true, "操作成功", map);
}
获取当前使用的配置文件信息
/**
* 根据key从gzt.properties配置文件获取配置信息
* @param key 键值
* @return
*/
public String getSysPro(String key){
return getSysPro(key, null);
}
/**
* 根据key从gzt.properties配置文件获取配置信息
* @param key 键值
* @param defaultValue 默认值
* @return
*/
public String getSysPro(String key,String defaultValue){
return getValue("spring/imageserver-"+System.getProperty("spring.profiles.active")+".properties", key, defaultValue);
}
例：
//获取服务器绝对路径 linux 服务器地址
String urlString=PropertiesUtil.getInstance().getSysPro("uploadPath");
PropertiesUtil 类
package com.xyz.imageserver.common.properties;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
/**
*
* @ClassName PropertiesUtil.java
* @Description 系统配置工具类
* @author caijy
* @date 2015年6月9日 上午10:50:38
* @version 1.0.0
*/
public class PropertiesUtil {
private Logger logger = LoggerFactory.getLogger(PropertiesUtil.class);
private ConcurrentHashMap<String, Properties> proMap;
private PropertiesUtil() {
proMap = new ConcurrentHashMap<String, Properties>();
}
private static PropertiesUtil instance = new PropertiesUtil();
/**
* 获取单例对象
* @return
*/
public static PropertiesUtil getInstance()
{
return instance;
}
/**
* 根据key从gzt.properties配置文件获取配置信息
* @param key 键值
* @return
*/
public String getSysPro(String key){
return getSysPro(key, null);
}
/**
* 根据key从gzt.properties配置文件获取配置信息
* @param key 键值
* @param defaultValue 默认值
* @return
*/
public String getSysPro(String key,String defaultValue){
return getValue("spring/imageserver-"+System.getProperty("spring.profiles.active")+".properties", key, defaultValue);
}
/**
* 从配置文件中获取对应key值
* @param fileName 配置文件名
* @param key key值
* @param defaultValue 默认值
* @return
*/
public String getValue(String fileName,String key,String defaultValue){
String val = null;
Properties properties = proMap.get(fileName);
if(properties == null){
InputStream inputStream = PropertiesUtil.class.getClassLoader().getResourceAsStream(fileName);
try {
properties = new Properties();
properties.load(new InputStreamReader(inputStream,"UTF-8"));
proMap.put(fileName, properties);
val = properties.getProperty(key,defaultValue);
} catch (IOException e) {
logger.error("getValue",e);
}finally{
try {
if (inputStream != null) {
inputStream.close();
}
} catch (IOException e1) {
logger.error(e1.toString());
}
}
}else{
val = properties.getProperty(key,defaultValue);
}
return val;
}
}