您好，我想使用 maven 依賴項使用解組來獲取嵌套 xml 的值，但最終輸出返回空值。我在 maven 項目中使用了 3 個包，并且在獲取值后，vehicle.xml 包含 car 的值必須將它們插入到access數(shù)據(jù)庫中我的 XML 文件---> Vehicle.xml<?xml version="1.0" encoding="UTF-8"?><Vehicle>   <Car>      <manufacturer>Maruti</manufacturer>      <cost>675000</cost>      <name>Ciaz</name>      <fueType>Petrol</fueType>      <driverTye>Manual</driverTye>   </Car>   <Car>      <manufacturer>Maruti</manufacturer>      <cost>575000</cost>      <name>Dezire</name>      <fueType>Petrol</fueType>      <driverTye>Manual</driverTye>   </Car></Vehicle>歌唱班Vehicle.javapackage jaxb;import java.util.List;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement(name="Vehicle")public class Vehicle {    @XmlElement    private List<Car> car;    public List<Car> getCar() {        return car;    }    /*     * public Vehicle(List<Car> car) { super(); this.car = car; }     */    @Override    public String toString() {        return "Vehicle[ Car="+car+"]";    }}Car.java（這是子 POJO）package jaxb;import javax.xml.bind.annotation.XmlElement;import javax.xml.bind.annotation.XmlRootElement;@XmlRootElement(name="Car")public class Car {    private String manufacturer;    private String name;    private String driverType;    private String fuelType;    private int cost;    @XmlElement    public String getManufacturer() {        return manufacturer;    }    public void setManufacturer(String manufacturer) {        this.manufacturer = manufacturer;    }    @XmlElement    public String getName() {        return name;    }    public void setName(String name) {        this.name = name;    }    @XmlElement    public String getDriverType() {        return driverType;    }    public void setDriverType(String driverType) {        this.driverType = driverType;    }    @XmlElement    public String getFuelType() {        return fuelType;    }    public void setFuelType(String fuelType) {        this.fuelType = fuelType;    }