Java Base64解码错误

自己在做一个小网站充当练手,但是前端图片经过base64加密后传往后端在解码。但是一直都有问题,请大神赐教

    public static String base64ToImg(String src) throws IOException {

String uuid = UUID.randomUUID().toString();

StringBuilder newPath = new StringBuilder(IMG_ROOT_PATH);

newPath.append(separator).

append(uuid).

append(IMG_SUFFIX);

if(src == null){

return null;

}

byte[] data = null;

Base64.Decoder decoder = Base64.getDecoder();

try (OutputStream out = new FileOutputStream(newPath.toString())) {

data = decoder.decode(src);

out.write(data);

return newPath.toString();

} catch (IOException e) {

throw new IOException();

}

}

 java.lang.IllegalArgumentException: Input byte array has wrong 4-byte ending unit

以上是相关的异常信息。我试图将前端的base64码粘贴到记事本然后自己在试着解码,也是同样问题。

回答:

IllegalArgumentException:非法参数异常,

试下这个,应该可以。
给你讲述下过程:
去了stackoverflow,debug。最后发现data为null,,加油吧,我们需要学的还很多
下次遇到问题debug下,看是哪条代码出现问题了,通过回答你,我也学到了很多
关键点在这里: throw new IOException();

try (OutputStream out = new FileOutputStream(newPath.toString())) {

out.write(data);

} catch (IOException e) {

e.printStackTrace();

throw new RuntimeException("异常是这么抛出的");

//throw new RuntimeException(e);

}

public static String base64ToImg(String src) throws IOException {

String uuid = UUID.randomUUID().toString();

StringBuilder newPath = new StringBuilder("xx");

newPath.append("xx").

append(uuid).

append("xx");

if (src == null) {

return null;

}

byte[] data = Base64.getDecoder().decode(src);

try (OutputStream out = new FileOutputStream(newPath.toString())) {

out.write(data);

} catch (IOException e) {

e.printStackTrace();

}

return newPath.toString();

}

补充另外一种常用关闭资源:

 public static String base64ToImg(String src) throws IOException {

String uuid = UUID.randomUUID().toString();

StringBuilder newPath = new StringBuilder("xx");

newPath.append("xx").

append(uuid).

append("xx");

if (src == null) {

return null;

}

byte[] data = null;

OutputStream out = null;

Base64.Decoder decoder = Base64.getDecoder();

try {

out = new FileOutputStream(newPath.toString());

data = decoder.decode(src);

out.write(data);

} catch (IOException e) {

e.printStackTrace();

} finally {

if (out != null) {

out.close();

}

}

return newPath.toString();

}

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