jdk1.8 ognl 报 MemberAccess implementation must be provided!

淡淡的烟草味﹌ 2024-03-25 21:24 24阅读 0赞

### ognl 类 ###

**我是在项目中使用Workbook导出excel时使用到了ognl。**  
如果是jdk1.8  
就用ognl3.3.X的版本

<dependency>
        <groupId>ognl</groupId>
        <artifactId>ognl</artifactId>
        <version>3.3.1</version>
    </dependency>

这个版本对应的是jdk8，里面有自带的 MemberAccess 的实现类  
![在这里插入图片描述][3fe9fa6c53ef46e588ba0edf7239fe24.png]  
如果是jdk7版本  
也就是ognl3.3.X以下的版本  
就缺少MemberAccess 的实现了，需自己手动补上  
官方路径：

> https://github.com/orphan-oss/ognl/blob/master/src/test/java/ognl/DefaultMemberAccess.java

复制代码如下：

/*
     * Licensed to the Apache Software Foundation (ASF) under one
     * or more contributor license agreements.  See the NOTICE file
     * distributed with this work for additional information
     * regarding copyright ownership.  The ASF licenses this file
     * to you under the Apache License, Version 2.0 (the
     * "License"); you may not use this file except in compliance
     * with the License.  You may obtain a copy of the License at
     *
     *   http://www.apache.org/licenses/LICENSE-2.0
     *
     * Unless required by applicable law or agreed to in writing,
     * software distributed under the License is distributed on an
     * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
     * KIND, either express or implied.  See the License for the
     * specific language governing permissions and limitations
     * under the License.
     */
    package ognl;
    
    import java.lang.reflect.AccessibleObject;
    import java.lang.reflect.Member;
    import java.lang.reflect.Modifier;
    
    /**
     * This class provides methods for setting up and restoring
     * access in a Field.  Java 2 provides access utilities for setting
     * and getting fields that are non-public.  This object provides
     * coarse-grained access controls to allow access to private, protected
     * and package protected members.  This will apply to all classes
     * and members.
     */
    public class DefaultMemberAccess implements MemberAccess {
        
        /*
         * Assign an accessibility modification mechanism, based on Major Java Version.
         *   Note: Can be overridden using a Java option flag {@link OgnlRuntime#USE_PREJDK9_ACESS_HANDLER}.
         */
        private static final AccessibleObjectHandler _accessibleObjectHandler;
    
        static {
        
            _accessibleObjectHandler = OgnlRuntime.usingJDK9PlusAccessHandler() ? AccessibleObjectHandlerJDK9Plus.createHandler() :
                    AccessibleObjectHandlerPreJDK9.createHandler();
        }
    
        public boolean allowPrivateAccess = false;
        public boolean allowProtectedAccess = false;
        public boolean allowPackageProtectedAccess = false;
    
        public DefaultMemberAccess(boolean allowAllAccess) {
        
            this(allowAllAccess, allowAllAccess, allowAllAccess);
        }
    
        public DefaultMemberAccess(boolean allowPrivateAccess, boolean allowProtectedAccess, boolean allowPackageProtectedAccess) {
        
            super();
            this.allowPrivateAccess = allowPrivateAccess;
            this.allowProtectedAccess = allowProtectedAccess;
            this.allowPackageProtectedAccess = allowPackageProtectedAccess;
        }
    
        public boolean getAllowPrivateAccess() {
        
            return allowPrivateAccess;
        }
    
        public void setAllowPrivateAccess(boolean value) {
        
            allowPrivateAccess = value;
        }
    
        public boolean getAllowProtectedAccess() {
        
            return allowProtectedAccess;
        }
    
        public void setAllowProtectedAccess(boolean value) {
        
            allowProtectedAccess = value;
        }
    
        public boolean getAllowPackageProtectedAccess() {
        
            return allowPackageProtectedAccess;
        }
    
        public void setAllowPackageProtectedAccess(boolean value) {
        
            allowPackageProtectedAccess = value;
        }
    
        public Object setup(OgnlContext context, Object target, Member member, String propertyName) {
        
            Object result = null;
    
            if (isAccessible(context, target, member, propertyName)) {
        
                AccessibleObject accessible = (AccessibleObject) member;
    
                if (!accessible.isAccessible()) {
        
                    result = Boolean.FALSE;
                    _accessibleObjectHandler.setAccessible(accessible, true);
                }
            }
            return result;
        }
    
        public void restore(OgnlContext context, Object target, Member member, String propertyName, Object state) {
        
            if (state != null) {
        
                final AccessibleObject accessible = (AccessibleObject) member;
                final boolean stateboolean = ((Boolean) state).booleanValue();  // Using twice (avoid unboxing)
                if (!stateboolean) {
        
                    _accessibleObjectHandler.setAccessible(accessible, stateboolean);
                } else {
        
                    throw new IllegalArgumentException("Improper restore state [" + stateboolean + "] for target [" + target +
                            "], member [" + member + "], propertyName [" + propertyName + "]");
                }
            }
        }
    
        /**
         * Returns true if the given member is accessible or can be made accessible
         * by this object.
         *
         * @param context      the current execution context (not used).
         * @param target       the Object to test accessibility for (not used).
         * @param member       the Member to test accessibility for.
         * @param propertyName the property to test accessibility for (not used).
         * @return true if the member is accessible in the context, false otherwise.
         */
        public boolean isAccessible(OgnlContext context, Object target, Member member, String propertyName) {
        
            int modifiers = member.getModifiers();
            boolean result = Modifier.isPublic(modifiers);
    
            if (!result) {
        
                if (Modifier.isPrivate(modifiers)) {
        
                    result = getAllowPrivateAccess();
                } else {
        
                    if (Modifier.isProtected(modifiers)) {
        
                        result = getAllowProtectedAccess();
                    } else {
        
                        result = getAllowPackageProtectedAccess();
                    }
                }
            }
            return result;
        }
    }

重新运行就不会报错了。

[3fe9fa6c53ef46e588ba0edf7239fe24.png]: https://image.dandelioncloud.cn/pgy_files/images/2024/03/25/248f8001935f4f9db2dcc501a30a8111.png