Java JDK7中Base64类的使用
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Use of Base64 class in JDK7
提问by Shiladittya Chakraborty
I am trying to use Base64class in jdk7 but I am getting Base64 cannot be resolvederror. Why eclipse throw this error?
我正在尝试Base64在 jdk7 中使用类，但Base64 cannot be resolved出现错误。为什么eclipse会抛出这个错误？
I am using below code
我正在使用下面的代码
byte[] imageData = Base64.getDecoder().decode(readFile(imagePart.getInputStream()));
even import statement also shows the same error : import java.util.Base64;
即使导入语句也显示相同的错误： import java.util.Base64;
Is this class not available in jdk7?
这个类在jdk7中不可用吗？
采纳答案by Henry
回答by Azat Nugusbayev
Base64.getDecoder().decode() is available from 1.8
Base64.getDecoder().decode() 可从 1.8
Try to use Google Guava.
尝试使用谷歌番石榴。
POM
聚甲醛
<dependency>
<artifactId>guava</artifactId>
<groupId>com.google.guava</groupId>
<type>jar</type>
<version>14.0.1</version>
</dependency>
Code Snippet
代码片段
String inputContent = "Hello World";
String base64String = BaseEncoding.base64().encode(inputContent.getBytes("UTF-8"));
//decode
System.out.println("Base64:" + base64String);
byte[] contentInBytes = BaseEncoding.base64().decode(base64String);
System.out.println("Source content: " + new String(contentInBytes, "UTF-8"));//Hello World
回答by awsome
java.util.Base64 is available in Java 8 or better
java.util.Base64 在 Java 8 或更高版本中可用
In Java 7 you can use Apache Commons Codec
在 Java 7 中，您可以使用Apache Commons Codec
See here for examples http://www.rgagnon.com/javadetails/java-0598.html
回答by predrags
If it is needed to specifically use JDK7 for your project, and you still need to use java.util.Base64class, you can include in your project the code for that class from OpenJDK.
如果您的项目需要专门使用 JDK7，并且您仍然需要使用java.util.Base64类，您可以在您的项目中包含 OpenJDK 中该类的代码。
Source for this class is available at:
http://www.grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/util/Base64.java?av=f
此类源可从以下网址获得：http:
//www.grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/util/Base64.java?av=f
Base64.javafile can be downloaded at:
http://www.grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/util/Base64.java/?v=source&disposition=attachment
Base64.java文件可以在以下位置下载：http:
//www.grepcode.com/file_/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/util/Base64.java/?v=来源&处置=附件
回答by Zac
As stated java.util.Base64 is not available until 8.
如前所述，java.util.Base64 直到 8 才可用。
However I find it worth noting that Android developers have access to android.util.Base64 at language level 7 (API 24) and the codeis entirely self contained so you can copy and drop it into your project if you need Base64 and don't want to use a 3rd party like Apache. Just watch rights and usage and all that.
但是我发现值得注意的是，Android 开发人员可以在语言级别 7（API 24）上访问 android.util.Base64 并且代码是完全自包含的，因此如果您需要 Base64 并且不需要 Base64，您可以将其复制并放入您的项目中想使用像Apache这样的 3rd 方。只需注意权利和使用情况以及所有这些。
