重构部分代码；修改方法名。

src/main/java/xyz/zhouxy/jdbc/DefaultBeanRowMapper.java

@@ -0,0 +1,110 @@
+/*
+ * Copyright 2022-2024 the original author or authors.
+ *
+ * Licensed 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
+ *
+ *      https://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 xyz.zhouxy.jdbc;
+
+import java.beans.BeanInfo;
+import java.beans.IntrospectionException;
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.sql.ResultSet;
+import java.sql.ResultSetMetaData;
+import java.sql.SQLException;
+import java.util.Arrays;
+import java.util.Map;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+import javax.annotation.Nullable;
+
+import com.google.common.base.CaseFormat;
+
+public class DefaultBeanRowMapper<T> implements RowMapper<T> {
+
+    private final Constructor<T> constructor;
+    private final Map<String, PropertyDescriptor> colPropertyMap;
+
+    private DefaultBeanRowMapper(Constructor<T> constructor, Map<String, PropertyDescriptor> colPropertyMap) {
+        this.constructor = constructor;
+        this.colPropertyMap = colPropertyMap;
+    }
+
+    public static <T> DefaultBeanRowMapper<T> of(Class<T> beanType) throws SQLException {
+        return of(beanType, null);
+    }
+
+    public static <T> DefaultBeanRowMapper<T> of(Class<T> beanType, @Nullable Map<String, String> propertyColMap)
+            throws SQLException {
+        try {
+            // 获取无参构造器
+            Constructor<T> constructor = beanType.getDeclaredConstructor();
+            constructor.setAccessible(true); // NOSONAR
+
+            // 构建 column name 和 PropertyDescriptor 的 映射
+            BeanInfo beanInfo = Introspector.getBeanInfo(beanType);
+            PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
+
+            Function<? super PropertyDescriptor, String> keyMapper;
+            if (propertyColMap == null || propertyColMap.isEmpty()) {
+                keyMapper = p -> CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, p.getName());
+            }
+            else {
+                keyMapper = p -> {
+                    String propertyName = p.getName();
+                    String colName = propertyColMap.get(propertyName);
+                    return colName != null ? colName
+                            : CaseFormat.LOWER_CAMEL.to(CaseFormat.LOWER_UNDERSCORE, propertyName);
+                };
+            }
+            Map<String, PropertyDescriptor> colPropertyMap = Arrays.stream(propertyDescriptors).collect(
+                    Collectors.toMap(keyMapper, Function.identity(), (a, b) -> b));
+            return new DefaultBeanRowMapper<>(constructor, colPropertyMap);
+        }
+        catch (IntrospectionException e) {
+            throw new SQLException("There is an exception occurs during introspection.", e);
+        }
+        catch (NoSuchMethodException e) {
+            throw new SQLException("Could not find a no-args constructor in " + beanType.getName(), e);
+        }
+    }
+
+    @Override
+    public T mapRow(ResultSet rs, int rowNumber) throws SQLException {
+        try {
+            T newInstance = this.constructor.newInstance();
+            ResultSetMetaData metaData = rs.getMetaData();
+            for (int i = 1; i <= metaData.getColumnCount(); i++) {
+                String colName = metaData.getColumnName(i);
+                PropertyDescriptor propertyDescriptor = this.colPropertyMap.get(colName);
+                if (propertyDescriptor != null) {
+                    Method setter = propertyDescriptor.getWriteMethod();
+                    if (setter != null) {
+                        Class<?> propertyType = propertyDescriptor.getPropertyType();
+                        setter.setAccessible(true); // NOSONAR
+                        setter.invoke(newInstance, rs.getObject(colName, propertyType));
+                    }
+                }
+            }
+            return newInstance;
+        }
+        catch (IllegalAccessException | InstantiationException | InvocationTargetException e) {
+            throw new SQLException(e);
+        }
+    }
+}