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ModifierUtil和ReflectUtil增加removeFinalModify
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Looly
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-------------------------------------------------------------------------------------------------------------
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# 5.8.8.M1 (2022-09-20)
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# 5.8.8.M1 (2022-09-21)
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### 🐣新特性
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* 【core 】 StreamUtil.of方法新增对 Iterator 支持；StreamUtil.of(Iterable) 方法优化（pr#807@Gitee）
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* 【core 】 增加.wgt格式的MimeType（pr#2617@Github）
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* 【core 】 EnumUtil.getBy增加带默认值重载（issue#I5RZU6@Gitee）
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* 【core 】 ModifierUtil和ReflectUtil增加removeFinalModify（pr#810@Gitee）
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### 🐞Bug修复
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* 【core 】 修复FileNameUtil.cleanInvalid无法去除换行符问题（issue#I5RMZV@Gitee）
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@ -1,5 +1,7 @@
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package cn.hutool.core.util;
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import cn.hutool.core.exceptions.UtilException;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.Field;
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import java.lang.reflect.Method;
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@ -262,6 +264,58 @@ public class ModifierUtil {
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public static boolean isAbstract(Method method) {
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return hasModifier(method, ModifierType.ABSTRACT);
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}
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/**
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* 设置final的field字段可以被修改
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* <p>
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* 只要不会被编译器内联优化的 final 属性就可以通过反射有效的进行修改 -- 修改后代码中可使用到新的值;
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* <br/>
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* <h3>以下属性，编译器会内联优化，无法通过反射修改：</h3>
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* <ul>
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* <li> 基本类型 byte, char, short, int, long, float, double, boolean</li>
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* <li> Literal String 类型(直接双引号字符串)</li>
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* </ul>
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* <h3>以下属性，可以通过反射修改：</h3>
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* <ul>
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* <li>基本类型的包装类 Byte、Character、Short、Long、Float、Double、Boolean</li>
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* <li>字符串，通过 new String("")实例化</li>
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* <li>自定义java类</li>
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* </ul>
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* </p>
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* <code>
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* //示例，移除final修饰符
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* class JdbcDialects {private static final List<Number> dialects = new ArrayList<>();}
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* Field field = ReflectUtil.getField(JdbcDialects.class, fieldName);
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* ReflectUtil.removeFinalModify(field);
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* ReflectUtil.setFieldValue(JdbcDialects.class, fieldName, dialects);
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* </code>
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* @param field 被修改的field，不可以为空
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* @throws UtilException IllegalAccessException等异常包装
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* @since 5.8.8
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* @author dazer
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*/
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public static void removeFinalModify(Field field) {
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if (field != null) {
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if (hasModifier(field, ModifierUtil.ModifierType.FINAL)) {
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//将字段的访问权限设为true：即去除private修饰符的影响
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if (false == field.isAccessible()) {
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field.setAccessible(true);
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}
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try {
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//去除final修饰符的影响，将字段设为可修改的
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final Field modifiersField = Field.class.getDeclaredField("modifiers");
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//Field 的 modifiers 是私有的
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modifiersField.setAccessible(true);
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//& ：位与运算符，按位与； 运算规则：两个数都转为二进制，然后从高位开始比较，如果两个数都为1则为1，否则为0。
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//~ ：位非运算符，按位取反；运算规则：转成二进制，如果位为0，结果是1，如果位为1，结果是0.
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modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
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} catch (final NoSuchFieldException | IllegalAccessException e) {
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//内部，工具类，基本不抛出异常
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throw new UtilException(e, "IllegalAccess for {}.{}", field.getDeclaringClass(), field.getName());
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}
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}
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}
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}
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//-------------------------------------------------------------------------------------------------------- Private method start
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/**
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@ -9,7 +9,6 @@ import cn.hutool.core.exceptions.InvocationTargetRuntimeException;
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import cn.hutool.core.exceptions.UtilException;
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import cn.hutool.core.lang.Assert;
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import cn.hutool.core.lang.Filter;
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import java.lang.reflect.Modifier;
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import cn.hutool.core.lang.reflect.MethodHandleUtil;
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import cn.hutool.core.map.MapUtil;
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import cn.hutool.core.map.WeakConcurrentMap;
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@ -1141,26 +1140,7 @@ public class ReflectUtil {
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* @author dazer
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*/
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public static void removeFinalModify(Field field) {
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if (field != null) {
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if (ModifierUtil.hasModifier(field, ModifierUtil.ModifierType.FINAL)) {
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//将字段的访问权限设为true：即去除private修饰符的影响
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if (!field.isAccessible()) {
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field.setAccessible(true);
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}
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try {
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//去除final修饰符的影响，将字段设为可修改的
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Field modifiersField = Field.class.getDeclaredField("modifiers");
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//Field 的 modifiers 是私有的
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modifiersField.setAccessible(true);
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//& ：位与运算符，按位与； 运算规则：两个数都转为二进制，然后从高位开始比较，如果两个数都为1则为1，否则为0。
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//~ ：位非运算符，按位取反；运算规则：转成二进制，如果位为0，结果是1，如果位为1，结果是0.
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modifiersField.setInt(field, field.getModifiers() & ~Modifier.FINAL);
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} catch (NoSuchFieldException | IllegalAccessException e) {
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//内部，工具类，基本不抛出异常
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throw new UtilException(e, "IllegalAccess for {}.{}", field.getDeclaringClass(), field.getName());
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}
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}
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}
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ModifierUtil.removeFinalModify(field);
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}
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/**
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@ -74,7 +74,7 @@ public class ReflectUtilTest {
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@Test
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public void getFieldTest() {
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// 能够获取到父类字段
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Field privateField = ReflectUtil.getField(TestSubClass.class, "privateField");
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final Field privateField = ReflectUtil.getField(TestSubClass.class, "privateField");
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Assert.assertNotNull(privateField);
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}
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@ -87,14 +87,14 @@ public class ReflectUtilTest {
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@Test
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public void setFieldTest() {
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TestClass testClass = new TestClass();
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final TestClass testClass = new TestClass();
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ReflectUtil.setFieldValue(testClass, "a", "111");
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Assert.assertEquals(111, testClass.getA());
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}
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@Test
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public void invokeTest() {
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TestClass testClass = new TestClass();
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final TestClass testClass = new TestClass();
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ReflectUtil.invoke(testClass, "setA", 10);
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Assert.assertEquals(10, testClass.getA());
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}
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@ -155,7 +155,7 @@ public class ReflectUtilTest {
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private String n;
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}
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public static Method getMethodWithReturnTypeCheck(Class<?> clazz, boolean ignoreCase, String methodName, Class<?>... paramTypes) throws SecurityException {
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public static Method getMethodWithReturnTypeCheck(final Class<?> clazz, final boolean ignoreCase, final String methodName, final Class<?>... paramTypes) throws SecurityException {
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if (null == clazz || StrUtil.isBlank(methodName)) {
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return null;
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}
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@ -163,7 +163,7 @@ public class ReflectUtilTest {
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Method res = null;
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final Method[] methods = ReflectUtil.getMethods(clazz);
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if (ArrayUtil.isNotEmpty(methods)) {
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for (Method method : methods) {
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for (final Method method : methods) {
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if (StrUtil.equals(methodName, method.getName(), ignoreCase)
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&& ClassUtil.isAllAssignableFrom(method.getParameterTypes(), paramTypes)
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&& (res == null
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@ -252,22 +252,22 @@ public class ReflectUtilTest {
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@Test
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public void newInstanceIfPossibleTest(){
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//noinspection ConstantConditions
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int intValue = ReflectUtil.newInstanceIfPossible(int.class);
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final int intValue = ReflectUtil.newInstanceIfPossible(int.class);
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Assert.assertEquals(0, intValue);
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Integer integer = ReflectUtil.newInstanceIfPossible(Integer.class);
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final Integer integer = ReflectUtil.newInstanceIfPossible(Integer.class);
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Assert.assertEquals(new Integer(0), integer);
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Map<?, ?> map = ReflectUtil.newInstanceIfPossible(Map.class);
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final Map<?, ?> map = ReflectUtil.newInstanceIfPossible(Map.class);
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Assert.assertNotNull(map);
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Collection<?> collection = ReflectUtil.newInstanceIfPossible(Collection.class);
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final Collection<?> collection = ReflectUtil.newInstanceIfPossible(Collection.class);
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Assert.assertNotNull(collection);
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Week week = ReflectUtil.newInstanceIfPossible(Week.class);
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final Week week = ReflectUtil.newInstanceIfPossible(Week.class);
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Assert.assertEquals(Week.SUNDAY, week);
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int[] intArray = ReflectUtil.newInstanceIfPossible(int[].class);
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final int[] intArray = ReflectUtil.newInstanceIfPossible(int[].class);
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Assert.assertArrayEquals(new int[0], intArray);
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}
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@ -277,8 +277,8 @@ public class ReflectUtilTest {
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}
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@Test
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public void setFieldValueTest() {
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String fieldName = "DIALECTS";
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public void setFieldValueWithFinalTest() {
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final String fieldName = "DIALECTS";
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final List<Number> dialects =
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Arrays.asList(
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1,
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@ -286,7 +286,7 @@ public class ReflectUtilTest {
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3,
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99
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);
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Field field = ReflectUtil.getField(JdbcDialects.class, fieldName);
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final Field field = ReflectUtil.getField(JdbcDialects.class, fieldName);
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ReflectUtil.removeFinalModify(field);
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ReflectUtil.setFieldValue(JdbcDialects.class, fieldName, dialects);
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