java解码base64

Java解码base64可以使用Java自带的Base64类，示例代码如下：

import java.util.Base64;

public class Base64Decoder {
    public static void main(String[] args) {
        String encodedString = "SGVsbG8gV29ybGQh";
        byte[] decodedBytes = Base64.getDecoder().decode(encodedString);
        String decodedString = new String(decodedBytes);
        System.out.println(decodedString);
    }
}

输出结果为：Hello World!

相关问题

怎么用java解码base64为图片

使用Java解码Base64编码的字符串为图片可以使用Java内置的Base64类和ImageIO类。下面是一个简单的示例代码：

import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.Base64;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;

public class Base64Decoder {
    public static void main(String[] args) {
        // Base64编码的字符串
        String base64String = "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

Java实现base64解码

以下是使用Java实现Base64解码的代码示例：

引用中的代码示例使用了Apache Commons Codec库实现Base64解码。首先，将待解码的字符串转换为字节数组，然后使用Base64.decodeBase64()方法对字节数组进行解码。最后，将解码后的字节数组转换为字符串。

引用中的代码示例使用了BouncyCastle库实现Base64解码。与引用相似，首先将待解码的字符串转换为字节数组，然后使用Base64.decode()方法对字节数组进行解码。最后，将解码后的字节数组转换为字符串。

在Java 8及更高版本中，也可以使用自带的java.util.Base64类实现Base64解码。以下是示例代码：

import java.util.Base64;

public class Base64Decoder {
    public static void main(String[] args) {
        try {
            // 待解码的字符串
            String encodedString = "Y29tLmJhc2U2NC5kZW1v";

            // Base64解码
            byte[] decodedBytes = Base64.getDecoder().decode(encodedString);

            // 解码后的字符串
            String decodedString = new String(decodedBytes);

            System.out.println("Base64解码结果：" + decodedString);
        } catch (Exception e) {
            System.out.println("Base64解码异常");
            e.printStackTrace();
        }
    }
}

以上代码将待解码的字符串传递给Base64.getDecoder().decode()方法进行解码，并将解码后的字节数组转换为字符串。最终打印出Base64解码的结果。

综上所述，以上提供了三种Java实现Base64解码的方法，可以根据具体需求选择合适的方法来进行解码操作。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
#### 引用[.reference_title]
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