java将base64图片转为file上传到服务器

首先后台先创建工具类

package org.adv.fw.modular.util;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
import org.springframework.web.multipart.MultipartFile;

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];
    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;
  }
}

}

           

后台接受base64数据

@RequestMapping(value = "uploadbase64", method = RequestMethod.POST)
	@ResponseBody
	public Map<String, Object> uploadbase64(HttpServletRequest request) throws IOException {
		String img=request.getParameter("img");
		MultipartFile file = BASE64DecodedMultipartFile.base64ToMultipart(img);
		Oss o=osservice.selectById(1);
		UploadFile uf = new UploadFile();
		// 获取文件名
		String fileName = file.getOriginalFilename();
		// 获取文件后缀
		String prefix = fileName.substring(fileName.lastIndexOf("."));
		final File excelFile = File.createTempFile(UUID.randomUUID().toString(), prefix);
		file.transferTo(excelFile);
		oss.saveFileToOSS(excelFile, excelFile.getName());
		Map<String, Object> map = new HashMap<String, Object>();
		map.put("code", 0);// 0表示成功，1失败
		map.put("msg", "上传成功");// 提示消息
		map.put("data", String.format("http://%s.%s/%s", o.getBucketName(), o.getEndpoint(), excelFile.getName()));
		return  map;
	}