Base64Encoder和Base64Decoder问题解决

• 场景：前端base64图片内容传到后端，通过BASE64Decoder将图片Base64码转成上传流，上传成功后。更新jenkins时，更新失败。
• 问题：Java 9版本之后Base64Encoder和Base64Decoder无法继续使用？使用jenkins打包更新时无法使用BASE64Decoder的包(sun.misc.Base64Encoder和sun.misc.Base64Decoder无法使用)?
• 原因：JDK中的/lib/tool.jar和/lib/rt.jar已经从Java SE 9中删除。
• 改前：

  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;
  import sun.misc.BASE64Encoder;
  /**
   * 图片上传工具类
   */
  public class Base64 implements MultipartFile {
  
      private final byte[] imgContent;
      private final String header;
  
      public Base64(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);
      }
  
      /**
       * 将图片Base64 码转成上传流
       */
      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 Base64(b, baseStrs[0]);
          } catch (IOException e) {
              e.printStackTrace();
              return null;
          }
      }
  }

• 改后：

  import org.springframework.web.multipart.MultipartFile;
  import java.util.Base64;
  import java.util.Base64.Decoder;
  import java.io.*;
  /**
   * 图片上传工具类
   */
  public class Base64Util implements MultipartFile {
  
      private final byte[] imgContent;
      private final String header;
  
      public Base64Util(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);
      }
  
      /**
       * 将图片Base64 码转成上传流
       */
      public static MultipartFile base64ToMultipart(String base64) {
          String[] baseStrs = base64.split(",");
          String imgBase64 = base64.replaceAll("data:image/png;base64,","");
          Decoder decoder = Base64.getDecoder();
          byte[] result = decoder.decode(imgBase64);
          return new Base64Util(result, baseStrs[0]);
      }
  }

• 参考：https://blog.csdn.net/xie_sining/article/details/80777164