前端上传图片格式为base64位

base64转MultipartFile
文件上传接口传入字符串类型的参数后将参数转为MultipartFile格式，其中须要工具类（转为MultipartFile）
package com.social.util;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;

import org.springframework.web.multipart.MultipartFile;

import sun.misc.BASE64Decoder;

public class BASE64DecodedMultipartFile implements MultipartFile {

    private final byte[] imgContent;
    private final String header;

    public BASE64DecodedMultipartFile(byte[] imgContent, String header) {
        this.imgContent = imgContent;
        this.header = header.split(";")[0];
    }

    @Override
    public String getName() {
        // TODO - implementation depends on your requirements
        return System.currentTimeMillis() + Math.random() + "." + header.split("/")[1];
    }

    @Override
    public String getOriginalFilename() {
        // TODO - implementation depends on your requirements
        return System.currentTimeMillis() + (int)Math.random() * 10000 + "." + header.split("/")[1];
    }

    @Override
    public String getContentType() {
        // TODO - implementation depends on your requirements
        return header.split(":")[1];
    }

    @Override
    public boolean isEmpty() {
        return imgContent == null || imgContent.length == 0;
    }
    
    @Override
    public long getSize() {
        return imgContent.length;
    }

    @Override
    public byte[] getBytes() throws IOException {
        return imgContent;
    }

    @Override
    public InputStream getInputStream() throws IOException {
        return new ByteArrayInputStream(imgContent);
    }

    @Override
    public void transferTo(File dest) throws IOException, IllegalStateException {
        new FileOutputStream(dest).write(imgContent);
    }
    
    public static MultipartFile base64ToMultipart(String base64) {
        try {
            String[] baseStrs = base64.split(",");

            BASE64Decoder decoder = new BASE64Decoder();
            byte[] b = new byte[0];
            if(baseStrs.length>1){
	            b = decoder.decodeBuffer(baseStrs[1]);
	
	            for(int i = 0; i < b.length; ++i) {
	                if (b[i] < 0) {
	                    b[i] += 256;
	                }
	            }
            }
            return new BASE64DecodedMultipartFile(b, baseStrs[0]);
        } catch (IOException e) {
            e.printStackTrace();
            return null;
        }
    }
}
而后将参数file以及request传入service层，在service层写业务逻辑，
如下是上传图片代码
Map resultMap=new HashMap();
		try {
			if (request instanceof MultipartHttpServletRequest) {
				uploadFile = ((MultipartHttpServletRequest)request).getFile("file");
            }

			if(uploadFile!=null && uploadFile.getOriginalFilename()
					!=null && uploadFile.getOriginalFilename().length()>0){
				/**
                 * 项目服务器地址路径
                 */
                String projectServerPath = request.getScheme() + "://"+request.getServerName()+":" +
                                request.getServerPort() + request.getContextPath() + "/upload/";
                /**
                 * 上传文件绝对路径
                 */
                String path = request.getSession().getServletContext().getRealPath("/upload/");
				//原始名称  
	            String oldFileName = uploadFile.getOriginalFilename();
	          
	          //新的图片名称  
                String newFileName = UUID.randomUUID() + oldFileName.substring(oldFileName.lastIndexOf("."));  
                //新图片  
                File newFile = new File(path + "\\" + newFileName);  
                /**
                 * 判断路径是否存在，若是不存在就建立一个
                 */
                if (!newFile.getParentFile().exists()) { 
                    
                	newFile.getParentFile().mkdirs();
                }
                /**
                 * 建立文件
                 */
                uploadFile.transferTo(new File(path + File.separator + newFileName));
                String serverFilePatn = projectServerPath + newFileName;
				
					resultMap.put("error", 0);
					resultMap.put("url",serverFilePatn);
						return WxResult.ok(resultMap);
					
				}else{
					//返回结果
					resultMap.put("error", 1);
					resultMap.put("message", "文件异常");
					 return WxResult.ok(resultMap);
				}
			} catch (Exception e) {
				resultMap.put("error", 1);
				resultMap.put("message", "文件上传发生异常");
				 return WxResult.ok(resultMap);
			}
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