异常背景：

做shiro+salt+redis整合时，一直报不能序列化错误，不开启redis时还是正常的，开启redis后就出错。

问题描述：

自定义CustomerRealm extends AuthorizingRealm中认证方法中代码，问题出在ByteSource.Util.bytes(user.getSalt().getBytes())加入的随机盐部分不能序列化！（这也算是shiro中的一个诟病）！另外如果要做授权，实体类比如User、Role、Permission这些都要实现Serializable接口以确保可以序列化。

@Overrideprotected AuthenticationInfo doGetAuthenticationInfo(AuthenticationToken authenticationToken) throws AuthenticationException {String principal = (String) authenticationToken.getPrincipal();User user = userService.findByUserName(principal);if (!ObjectUtils.isEmpty(user)) {return new SimpleAuthenticationInfo(user.getUsername(),user.getPassword(),new MyByteSource(user.getSalt()),//ByteSource.Util.bytes(user.getSalt().getBytes()),this.getName());}return null;}

解决方案：

通过自定义MyByteSource.java来解决序列化问题，其中所有代码全是复制自SimpleByteSource.java类（因为该类已经实现了ByteSource，虽然大部分方法都没用，但还是要加上），然后加入无参构造，再稍进行修改即可。

import org.apache.shiro.codec.Base64;
import org.apache.shiro.codec.CodecSupport;
import org.apache.shiro.codec.Hex;
import org.apache.shiro.util.ByteSource;import java.io.File;
import java.io.InputStream;
import java.io.Serializable;
import java.util.Arrays;//salt实现自定义序列化接口
public class MyByteSource  implements ByteSource, Serializable {private  byte[] bytes;private String cachedHex;private String cachedBase64;public MyByteSource() {}public MyByteSource(byte[] bytes) {this.bytes = bytes;}public MyByteSource(char[] chars) {this.bytes = CodecSupport.toBytes(chars);}public MyByteSource(String string) {this.bytes = CodecSupport.toBytes(string);}public MyByteSource(ByteSource source) {this.bytes = source.getBytes();}public MyByteSource(File file) {this.bytes = (new MyByteSource.BytesHelper()).getBytes(file);}public MyByteSource(InputStream stream) {this.bytes = (new MyByteSource.BytesHelper()).getBytes(stream);}public static boolean isCompatible(Object o) {return o instanceof byte[] || o instanceof char[] || o instanceof String || o instanceof ByteSource || o instanceof File || o instanceof InputStream;}@Overridepublic byte[] getBytes() {return this.bytes;}@Overridepublic boolean isEmpty() {return this.bytes == null || this.bytes.length == 0;}@Overridepublic String toHex() {if (this.cachedHex == null) {this.cachedHex = Hex.encodeToString(this.getBytes());}return this.cachedHex;}@Overridepublic String toBase64() {if (this.cachedBase64 == null) {this.cachedBase64 = Base64.encodeToString(this.getBytes());}return this.cachedBase64;}@Overridepublic String toString() {return this.toBase64();}@Overridepublic int hashCode() {return this.bytes != null && this.bytes.length != 0 ? Arrays.hashCode(this.bytes) : 0;}@Overridepublic boolean equals(Object o) {if (o == this) {return true;} else if (o instanceof ByteSource) {ByteSource bs = (ByteSource)o;return Arrays.equals(this.getBytes(), bs.getBytes());} else {return false;}}private static final class BytesHelper extends CodecSupport {private BytesHelper() {}public byte[] getBytes(File file) {return this.toBytes(file);}public byte[] getBytes(InputStream stream) {return this.toBytes(stream);}}
}

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java.io.NotSerializableException: org.apache.shiro.util.SimpleByteSource at java.io.ObjectOutputStr

异常背景：

问题描述：

解决方案：

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