xml获取对象工具类
package com.itheima.utils;import java.io.File;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.List;
import org.dom4j.Document;
import org.dom4j.DocumentException;
import org.dom4j.Element;
import org.dom4j.io.SAXReader;
//获取xml文件的对象
public class XmlParserUtils2 {
//这里f指定是xml文件
public static <T> List<T> parse(String f, Class<T> cls, String sonElement) throws DocumentException, ClassNotFoundException, NoSuchMethodException, InvocationTargetException, InstantiationException, IllegalAccessException {
//反射出其类的变量
Field[] declaredFields = cls.getDeclaredFields();
SAXReader saxReader = new SAXReader();
Document read = saxReader.read(new File(f));
//根标签
Element rootElement = read.getRootElement();
//获得每一个子标签
List<Element> elements = rootElement.elements(sonElement);
//遍历每一个子标签
for (Element element : elements) {
System.out.println(element);
}
//该数组用于接收每个对象的属性值
Object[] obj = new Object;
//该数组是接收实体类构造器创建对象的参数
String[] arr = new String;
//该集合用于存取每个对象
ArrayList<Object> objects = new ArrayList<>();
//将对象的属性class的类型名添加到数组arr
for (int i1 = 0; i1 < declaredFields.length; i1++) {
arr = declaredFields.getType().getName();
}
//遍历实体类对象的属性的class类型的字符串
ArrayList<Class<?>> list = new ArrayList<>();
for (String className : arr) {
// 将字符串转换为Class对象
Class<?> clazz = Class.forName(className);
list.add(clazz);
}
Class<?>[] parameterTypes = list.toArray(new Class<?>);
Constructor<T> declaredConstructor = cls.getDeclaredConstructor(parameterTypes);
System.out.println(declaredConstructor);
declaredConstructor.setAccessible(true);
//该集合收取每个xml的对象
ArrayList<T> listObj = new ArrayList<T>();
//该实体类有多少变量就获得其几个属性
for (int i = 0; i < elements.size(); i++) {
//从xml获得每一个子标签
Element element = elements.get(i);
//遍历每个子标签下的所有属性
for (int j = 0; j < declaredFields.length; j++) {
//暴力访问
declaredFields.setAccessible(true);
//获得每一个变量名
String name = declaredFields.getName();
//获得xml每个子标签内的某个属性的文本值
String param = element.element(name).getText();
System.out.println(param);
//用数组存取当前用户的属性
obj = convertToType(param, declaredFields.getType());
}
T t = declaredConstructor.newInstance(obj);
listObj.add(t);
}
return listObj;
}
private static Object convertToType(String value, Class<?> targetType) {
try {
if (targetType == String.class) {
return value;
} else if (targetType == Integer.class || targetType == int.class) {
return Integer.parseInt(value);
} else if (targetType == Boolean.class || targetType == boolean.class) {
return Boolean.parseBoolean(value);
} else if (targetType == Double.class || targetType == double.class) {
return Double.parseDouble(value);
} else if (targetType == Float.class || targetType == float.class) {
return Float.parseFloat(value);
} else if (targetType == Long.class || targetType == long.class) {
return Long.parseLong(value);
} else {
throw new IllegalArgumentException("Unsupported type: " + targetType);
}
} catch (NumberFormatException e) {
// 处理转换失败的情况，例如返回默认值或抛出自定义异常
System.err.println("Failed to convert value: " + value + " to type: " + targetType);
return null; // 或者抛出自定义异常
}
}
}
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