mybatis插件优雅实现字段加密的示例代码

@Intercepts({@Signature(type = 代理的插件类, method = 类中的方法名, args = {方法参数})})
public class MyInterceptor implements Interceptor {
    Object intercept(Invocation invocation) throws Throwable{
        //invocation就是你要代理的方法。
        //在这里写主要的逻辑操作
        //todo
    }

    default Object plugin(Object target) {
        //是用来生成代理的
        //一般不重写
        return Plugin.wrap(target, this);
      }

      default void setProperties(Properties properties) {
        // NOP
      }
}

@Intercepts({@Signature(type = ParameterHandler.class, method = "setParameters", args = {PreparedStatement.class})})
public class MybatisEncryptInterceptor implements Interceptor {
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        return invocation;
    }
    @Override
    public Object plugin(Object target) {
        if (target instanceof ParameterHandler) {
            ParameterHandler parameterHandler = (ParameterHandler) target;
            Object parameterObject = parameterHandler.getParameterObject();
            // 进行加密操作
        }
        return target;
    }
    @Override
    public void setProperties(Properties properties) {
    }
}

public class Invocation {
  private final Object target;
  private final Method method;
  private final Object[] args;
  ...
}

@Intercepts({@Signature(type = ResultSetHandler.class, method = "handleResultSets", args = {Statement.class})})
public class MybatisDecryptInterceptor implements Interceptor {
    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        // 获取执行mysql执行结果
        Object result = invocation.proceed();
        if (result == null) {
            return null;
        }
        //解密result
        return result;
    }
    @Override
    public Object plugin(Object target) {
        return Plugin.wrap(target, this);
    }

    @Override
    public void setProperties(Properties properties) {
    }
}

@Intercepts({@Signature(type = Executor.class,method = "flushStatements",args = {})})
public class MybatisClearInterceptor implements Interceptor {
    public Object intercept(Invocation invocation) throws Throwable {
        Object result = invocation.proceed();
        if(EncryptHelper.hasSituation()){
            log.info("EncryptClear!!!");
        }
        EncryptHelper.clearEncrypt();
        return result;
    }
    @Override
    public Object plugin(Object target) {
        // 包装目标对象，创建代理对象
        return Plugin.wrap(target, this);
    }
    @Override
    public void setProperties(Properties properties) {
    }
}

public class EncryptHelper implements AutoCloseable {
    private static final ThreadLocal<EncryptSituation> LOCAL_ENCRYPT=new ThreadLocal<>();
    //操作
}