java实现图片上传至本地实例详解

在工作中要求将图片上传至本地，如下代码将介绍如何将图片上传至本地

准备工作：

环境：eclipse4.5-x64,jdk1.7-x64,maven3

tomcat服务器配置图片上传映射：

上传至本地服务器配置文件：image.properties

#\u672c\u5730\u670d\u52a1\u5668\u56fe\u7247\u4fdd\u5b58\u8def\u5f84
imagepath=/mall/upload/image/

#\u56fe\u7247\u540e\u7f00\u540d
file_extend_name=gif,jpg,jpeg,png,bmp

#\u672c\u5730\u670d\u52a1\u5668\u89c6\u9891\u5b58\u50a8\u5730\u5740
mediapath=/mall/upload/media/

#\u89c6\u9891\u540e\u7f00\u540d
media_extend_name=mp4

controlle：uploadutil.java

/**
 * 文件上传工具类
 * @author sang
 */
@controller
public class uploadutil {
 /** 记录日志对象 */
 private static final mylogger logger = new mylogger(uploadutil.class);
 /**图片格式错误信息*/
 private static final string loggerinfo1 = "的图片不符合限制";
 /**
  * 备注：
  * uploadimglocal,uploadimgoss,ossconfmapper均是静态成员变量
  * 则添加注解注意只能用@autowired且get,set方法不能有static否则报错
  * */
 /**文件上传：本地,注意*/
 private static uploadimglocal uploadimglocal;
 /**文件上传：oss对象 */
 private static uploadimgoss uploadimgoss;
 /**oss配置查询 */
 private static ossconfmapper ossconfmapper;

    public uploadimglocal getuploadimglocal() {
        return uploadimglocal;
    }
    @autowired
    public void setuploadimglocal(uploadimglocal uploadimglocal) {
        uploadutil.uploadimglocal = uploadimglocal;
    }

    public uploadimgoss getuploadimgoss() {
        return uploadimgoss;
    }
    @autowired
    public void setuploadimgoss(uploadimgoss uploadimgoss) {
        uploadutil.uploadimgoss = uploadimgoss;
    }

    public ossconfmapper getossconfmapper() {
        return ossconfmapper;
    }
    @autowired
    public void setossconfmapper(ossconfmapper ossconfmapper) {
        uploadutil.ossconfmapper = ossconfmapper;
    }


    /**
  * 上传文件:去除85这个宽度
  * @param mufile 上传文件
  * @param req
  * @return map 返回中 key值{0,1,2,oldimg} 0小图 1中图 2大图 oldimg原图
  */
 public static synchronized map<string, string> uploadfile(multipartfile mufile,httpservletrequest req) {
    map<string, string> map = null;
    try {
        //查询oss启用状态的配置信息
        ossconf ossconf=ossconfmapper.findbyossstatus();
        if(mufile != null && mufile.getsize()>0 && ossconf!=null) {
            //检查上传的图片的大小和扩展名
            if (!uploadimgcommon.checkfileforspringupload(mufile)) {
                throw new runtimeexception("上传" + mufile.getoriginalfilename() + loggerinfo1);
            }
            //oss类型0本地1阿里云2京东云
            string osstype=ossconf.getosstype();
            if("0".equals(osstype)){
                //上传本地
                map = uploadimglocal.uploadforabcsize(mufile);
            }else if("1".equals(osstype) || "2".equals(osstype)){
                //上传oss
                map=uploadimgoss.uploadforabcsize(mufile,ossconf);
            }
        }
        } catch (exception e) {
            e.printstacktrace();
            logger.error("上传文件失败"+e.getmessage(),e);
        }
  return map;
 }

}

类：uploadimglocal.java

/**
 * 上传文件：本地
 * @author somnus
 *
 */
@component("uploadimglocal")
public class uploadimglocal {
    /** 记录日志对象 */
 private static final mylogger logger = new mylogger(uploadimglocal.class);
 /**获得当前项目访问的地址 */
 private static string url;
 @resource(name = "syshelpermapper")
 private syshelpermapper syshelpermapper;

 /**
  * 上传文件:去除85这个宽度
  * 存储原图地址如：http://127.0.0.1:8080:/mall/upload/image/20170804/1501811601145.jpg
  * @param mufile
  * @return map 返回中 key值{0,1,2,oldimg} 0小图 1中图 2大图 oldimg原图
  */
 public map<string, string> uploadforabcsize(multipartfile mufile) {
  //封装结果集
    map<string, string> imgmap = new hashmap<string, string>();
  //服务器本地保存图片路径
  httpservletrequest request = ((servletrequestattributes) requestcontextholder.getrequestattributes()).getrequest();
  //获得当前项目访问的地址:http://127.0.0.1:8080
  url=uploadimgcommon.gethttpandport(request);
  //获取上传文件的保存路径:文件拼接地址：服务器本地保存路径+文件名+后缀
  string filenamess = uploadimgcommon.getpicnamepathsuffix();
  try {
    file file = new file(filenamess);
    //转存文件到指定的路径
   mufile.transferto(file);
   //获取原图地址
   logger.info(uploadimgcommon.loggerinfo1 + (url+filenamess));
   //存储原图地址如：/mall/upload/image/20170804/1501811601145.jpg
   imgmap.put(uploadimgcommon.oldimg, (url+filenamess));

   //图片处理：获取宽度集合，去除85这个宽度[352, 56, 160]
   int[] widths = uploadimgcommon.getimgsetout85(syshelpermapper.selectimageset());
   //给宽度集合升序排序
   uploadimgcommon.sortwidth(widths);//[56,160,352]
   //缩放文件
   file zoomfile=null;
   for(int i = 0; i < widths.length; i++){
    //20171226新优化：将指定尺寸图片存储至本地
    //缩放文件名
    string zoomfilename=uploadimgcommon.picpath + uploadimgcommon.prefix + uploadimgcommon.symbols + widths[i] + uploadimgcommon.suffix;
    //创建缩放文件
    zoomfile=new file(zoomfilename);
    //转存文件到指定的路径
    mufile.transferto(zoomfile);
    //获取指定尺寸图片地址:大图352中160小56
    logger.info(widths[i]+uploadimgcommon.loggerinfo2+(url + uploadimgcommon.picpath + uploadimgcommon.prefix + uploadimgcommon.symbols + widths[i] + uploadimgcommon.suffix));
    imgmap.put(i + "", (url + uploadimgcommon.picpath + uploadimgcommon.prefix + uploadimgcommon.symbols + widths[i] + uploadimgcommon.suffix));
   }
  } catch (illegalstateexception e) {
    e.printstacktrace();
   logger.error(uploadimgcommon.loggerinfo3, e);
  } catch (ioexception e) {
    e.printstacktrace();
   logger.error(uploadimgcommon.loggerinfo3, e);
  } catch (exception e) {
    e.printstacktrace();
   logger.error(uploadimgcommon.loggerinfo3, e);
  }
  return imgmap;
 }
}

公共方法：uploadimgcommon.java

package com.qianjiang.util.uploadutil;

import java.io.file;
import java.io.inputstream;
import java.util.arrays;
import java.util.date;
import java.util.hashmap;
import java.util.list;
import java.util.properties;

import javax.servlet.http.httpservletrequest;

import org.apache.commons.fileupload.fileitem;
import org.springframework.web.multipart.multipartfile;

import com.qianjiang.manager.bean.imageset;
import com.qianjiang.util.mylogger;
import com.qianjiang.util.utildate;

/**
 * 文件上传公共方法
 * @author somnus
 */
public class uploadimgcommon {
    /** 记录日志对象 */
 private static final mylogger logger = new mylogger(uploadimgcommon.class);
 /**定义图片*/
 protected static final string image = "image";
 /**定义视频*/
 protected static final string media="media";
 /**定义图片上传最大限制10mb*/
 private static long maxsize = 10 * 1024 * 1024;
 /**定义视频上传最大限制500mb */
 private static long mediamaxsize= 500 * 1024 * 1024;
 /**定义允许上传文件扩展名 */
 private static hashmap<string, string> extmap = new hashmap<string, string>();
 /**文件保存路径 */
 protected static string picpath;
 /** 要保存的文件名 */
 protected static string prefix;
 /**文件后缀 */
 protected static string suffix;
 /**定位宽度集合循环次数*/
 protected static final int three = 3;
 /**拼接图片缩放特殊符号*/
 protected static final string symbols="@";

 /**图片56缩放*/
 protected static final int small = 56;
 /**设置imgmap中返回小图key值*/
 protected static final int smallimg=0;
 /**原图*/
 protected static final string oldimg = "oldimg";
 protected static final string loggerinfo1 = "原图地址：";
 protected static final string loggerinfo2 = "尺寸的图片地址：";
 protected static final string loggerinfo3 = "图片上传，返回key值列表错误";
 //本地上传图片properties属性值
 protected static final string imagepath = "imagepath";
 //本地上传视频properties属性值
 protected static final string mediapath = "mediapath";

 /**初始化*/
 static {
    //允许图片扩展名
  extmap.put(image, "gif,jpg,jpeg,png,bmp");
  //允许视频扩展名
  extmap.put(media, "mp4");
 }

 /**
 * 获取上传文件的保存路径
 * 文件拼接地址：服务器本地保存路径+文件名+后缀
 * @return 文件名（全路径）
 */
 public static string getpicnamepathsuffix() {
  string filename="";
    try {
    //根据系统当前时间生成上传后保存的文件名
   long now = system.currenttimemillis();
   //文件名系统当前时间如1501848484869
   prefix = string.valueof(now);
   //文件路径如：/mall/upload/image/20170804/
   picpath = gethostandport().getproperty(imagepath) + utildate.todayformatstring(new date()) + "/";
   //根据真实路径创建目录文件
   file picsavefile = new file(picpath);
    if(!picsavefile.exists()){
         picsavefile.mkdirs();
    }
    //文件的后缀
   suffix = ".jpg";
   filename=picpath + prefix + suffix;
   logger.info("创建文件成功，文件名："+filename);
  } catch (exception e) {
    e.printstacktrace();
   logger.error("创建本地文件失败"+e.getmessage(),e);
  }
  return filename;
 }

 /**
  * 上传视频存储本地服务器
  * 获取上传文件的保存名称、服务器本地保存路径、后缀，拼接成文件地址
  * @return
  */
 public static string getvideonamepathsuffix() {
    string filename="";
    try {
        //根据系统当前时间生成上传后保存的文件名
    long now = system.currenttimemillis();
    //文件名系统当前时间如1501848484869
    prefix = string.valueof(now);
    //文件路径如：/mall/upload/media/20170804/
    picpath =gethostandport().getproperty(mediapath) + utildate.todayformatstring(new date()) + "/";
    //根据真实路径创建目录文件
    file picsavefile = new file(picpath);
    if(!picsavefile.exists()){
         picsavefile.mkdirs();
    }
    //文件的后缀(默认为mp4格式)
    uploadimgcommon.suffix = ".mp4";
    filename=picpath + prefix + suffix;
    logger.info("创建视频文件成功，文件名："+filename);
  } catch (exception e) {
    e.printstacktrace();
   logger.error("创建上传视频本地服务器地址失败:"+e.getlocalizedmessage(), e);
  }
  return filename;
 }

 /**
  * 获取宽度集合
  * @return
  */
 public static int[] getimgset(list<imageset> imgset) {
  int[] widths = new int[imgset.size()];
  for (int i = 0; i < imgset.size(); i++) {
   widths[i] = integer.parseint(imgset.get(i).getrulewidth());
  }
  return widths;
 }

 /**
  * 获取宽度集合，去除85这个宽度
  * @param imgset
  * @return
  */
 public static int[] getimgsetout85(list<imageset> imgset) {
  int[] widths = new int[three];
  for (int i = 0; i < imgset.size(); i++) {
   if ("85".equals(imgset.get(i).getrulewidth())) {
    if (i < 3) {
     i--;
    }
    continue;
   }
   widths[i] = integer.parseint(imgset.get(i).getrulewidth());
  }
  return widths;
 }

 /**
  * 给宽度集合升序排序
  * @param widths
  */
 public static void sortwidth(int[] widths) {
  for (int i = 0; i < widths.length; i++) {
   for (int j = i + 1; j < widths.length; j++) {
    int temp;
    if (widths[i] > widths[j]) {
     temp = widths[i];
     widths[i] = widths[j];
     widths[j] = temp;
    }
   }
  }
 }

 /**
  * 获得当前项目访问的地址
  * 比如http://127.0.0.1:8080
  * @param request
  * @return 返回当前项目访问的地址
  */
 public static string gethttpandport(httpservletrequest request) {
  return request.getscheme() + "://" + request.getservername() + ":" + request.getserverport();
 }

 /**
  * 读取配置文件信息
  * @return
  */
 public static properties gethostandport() {
  properties p = new properties();
  try{
    inputstream inputstream = uploadimgcommon.class.getclassloader().getresourceasstream("config/image.properties");
   p.load(inputstream);
  }catch(exception e){
    e.printstacktrace();
   logger.error("读取properties属性文件错误"+e.getmessage(),e);
  }
  return p;
 }

 /**
  * springmvc上传：验证上传图片的大小和扩展名
  * @param mufile 上传文件
  * @return 验证通过返回true，否则返回false
  */
 public static boolean checkfileforspringupload(multipartfile mufile) {
  boolean bool = true;
  // 检查文件大小
  if (mufile.getsize() > maxsize) {
   logger.error("=============>上传" + mufile.getoriginalfilename() + "文件大小超过限制");
   bool = false;
   return bool;
  }
  string filename = mufile.getoriginalfilename();
  //检查扩展名
  string fileext = filename.substring(filename.lastindexof(".") + 1).tolowercase();
  if (!arrays.<string> aslist(extmap.get(image).split(",")).contains(fileext)) {
   logger.error("上传文件" + mufile.getoriginalfilename() + "扩展名是不允许的扩展名。\n只允许" + extmap.get(image) + "格式。");
   bool = false;
   return bool;
  }
  return bool;
 }

 /**
  * js引入kindeditor插件实现文件上传
  * 验证上传文件大小和扩展名
  * @param file 上传文件
  * @return 验证通过返回true，否则返回false
  */
 public static boolean checkfileandmedia(fileitem file,string dirname) {
  boolean bool = true;
  //文件大小
    long filesize = file.getsize();
    //文件名
    string filename = file.getname();

    //检查文件大小
        if(filesize > maxsize && filesize > mediamaxsize){
             logger.error("=============>上传" + file.getfieldname() + "文件大小超过限制");
             bool = false;
             return bool;
        }

        //检查扩展名
        string fileext = filename.substring(filename.lastindexof(".") + 1).tolowercase();
        if(!arrays.<string>aslist(extmap.get(dirname).split(",")).contains(fileext)){
             logger.error("上传文件" + file.getfieldname() + "扩展名是不允许的扩展名。\n只允许" + extmap.get(dirname) + "格式。");
             bool = false;
             return bool;
        }

  return bool;
 }



}

上传成功后控制台打印信息：

上传成功后前台展示效果：

 

原文链接：https://blog.csdn.net/u014079773/article/details/79763325