博客

直接上代码，可以直接运行。唯一需要注意的是sun.misc.BASE64Decoder 这个包可能无法引入。可以参考这个博客设置

https://blog.csdn.net/erlian1992/article/details/79518416

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.UUID;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import sun.misc.BASE64Decoder;
import com.sun.org.apache.xml.internal.security.exceptions.Base64DecodingException;
import com.sun.org.apache.xml.internal.security.utils.Base64;


public class Test3 {
	
	
	// 图片路劲层级分隔符
	private static String separator = "/";
	

	public static void main(String[] args) throws Base64DecodingException {
		Test3 t = new Test3();
		//在这里可以直接写入base64的值进行测试
		String path = t.saveImg("");
		//输出路径
		System.out.println(path);
	}
	
	
	
	public String saveImg(String baseImg) throws Base64DecodingException   {
		//定义一个正则表达式的筛选规则，为了获取图片的类型
        String rgex = "data:image/(.*?);base64";
        String type = getSubUtilSimple(baseImg, rgex);
		//去除base64图片的前缀
		baseImg = baseImg.replaceFirst("data:(.+?);base64,", "");
		byte[] b;
		byte[] bs;
		OutputStream os = null;
		String fileName = "";
		String nowDate = "";
		// 格式化并获取当前日期（用来命名）
		SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
		nowDate = format.format(new Date());
		//把图片转换成二进制
		b = Base64.decode(baseImg.replaceAll(" ", "+"));
		//生成路径
		String path = "D:/home/upload/"  + separator + "img" + separator + nowDate + separator;
		//随机生成图片的名字，同时根据类型结尾
		fileName = UUID.randomUUID().toString() + "." + type;
		File file = new File(path);
		if (!file.exists() && !file.isDirectory()) {
			file.mkdirs();
		}
		File imageFile = new File(path + "/" + fileName);
		BASE64Decoder d = new BASE64Decoder();
		// 保存
		try {
			bs = d.decodeBuffer(Base64.encode(b));
			os = new FileOutputStream(imageFile);
			os.write(bs);
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
			
		}finally {
			if (os != null) {
				try {
					os.close();
				} catch (IOException e) {
					e.getLocalizedMessage();
				}
			}
		}
		
		return "img" + separator + nowDate + separator + fileName;
	}
	
	
	public static String getSubUtilSimple(String soap,String rgex){
		Pattern pattern = Pattern.compile(rgex);
		Matcher m = pattern.matcher(soap);
		while(m.find()){
			return m.group(1);
		}
		return "";


	}
}