使用反射在jaxb对象上设置ArrayList值时出现问题

Question

我正在尝试从对象集合（Tag）中读取值，并使用反射将它们映射到jaxb生成的对象。我有一个字段列表，它从主对象中筛选出所需的字段。

这是示例代码。我使用内部类Tag作为需要从中提取值的列表。列表字段列表充当过滤器。目标是使用反射将这些值复制到jaxb生成的对象中。我使用javabeanPropertyDescriptor来实现这一点。

现在，我遇到了为jaxb对象中的集合字段设置值的问题。对于List字段，jaxb不提供setter，而是必须使用getList（）.add（object）。如何实现这一点？

public class ReflectionTest2 {
    /**
     * @param args
     */
    public static void main(String[] args) {
        try{
            ReflectionTest2 testObj = new ReflectionTest2();
            List<Tag> tagList = new ArrayList<Tag>();
            createTag(tagList, testObj);
            List<String> fieldList = new ArrayList<String>();
            fieldList.add("ADSKContentGroup");
            fieldList.add("title");
            CaasContextObject object = new CaasContextObject();
            for(Tag each : tagList){
                innerLoop:
                    for(String field : fieldList){
                        if(each.name.equals(field)){
                            for (PropertyDescriptor pd : Introspector.getBeanInfo(
                                    CaasContextObject.class).getPropertyDescriptors()) {
                                if(pd.getWriteMethod() != null && !"class".equals(pd.getName())){
                                                                        if(pd.getName().equals(each.name)){         
                                        if(pd.getPropertyType().isAssignableFrom(java.util.List.class)){
                                            // handle list
                                        }else{
                                            pd.getWriteMethod().invoke(object, each.value);
                                        }
                                        break innerLoop;
                                    }
                                }
                            }
                        }
                    }
            }
            // Read object
            System.out.println("nnPrinting Title -->"+object.getTitle());
            for(String cg : object.getADSKContentGroup()){
                System.out.println(cg);
            }
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
    private static void createTag(List<Tag> tagList, ReflectionTest2 obj){
        Tag tag1 = obj.new Tag();
        tag1.setName("ADSKContentGroup");
        tag1.setValue("Documentation");
        tagList.add(tag1);
        Tag tag2 = obj.new Tag();
        tag2.setName("ADSKContentGroup");
        tag2.setValue("User Guide");
        tagList.add(tag2);
        Tag tag3 = obj.new Tag();
        tag3.setName("title");
        tag3.setValue("Test Title");
        tagList.add(tag3);
    }
    public class Tag {
        protected String name;
        protected String value;
        public String getName() {
            return name;
        }
        public void setName(String value) {
            this.name = value;
        }
        public String getValue() {
            return value;
        }
        public void setValue(String value) {
            this.value = value;
        }
    }
}

Jaxb生成的对象

public class CaasContextObject{
    @XmlElement(required = true)
    protected String title;
    @XmlElement(name = "ADSKContentGroup")
    protected List<String> adskContentGroup;

    public String getTitle() {
        return title;
    }
    public void setTitle(String value) {
        this.title = value;
    }
     /**
     * Gets the value of the adskContentGroup property.
     * 
     * <p>
     * This accessor method returns a reference to the live list,
     * not a snapshot. Therefore any modification you make to the
     * returned list will be present inside the JAXB object.
     * This is why there is not a <CODE>set</CODE> method for the adskContentGroup property.
     * 
     * <p>
     * For example, to add a new item, do as follows:
     * <pre>
     *    getADSKContentGroup().add(newItem);
     * </pre>
     * 
     * 
     * <p>
     * Objects of the following type(s) are allowed in the list
     * {@link String }
     * 
     * 
     */
    public List<String> getADSKContentGroup() {
        if (adskContentGroup == null) {
            adskContentGroup = new ArrayList<String>();
        }
        return this.adskContentGroup;
    }
}

正如您所看到的，问题在于设置adskContentGroup值。

任何建议都将不胜感激。

感谢

Answer 1

这就是您想要的吗？

if (pd.getReadMethod() != null && pd.getReadMethod().getReturnType().isAssignableFrom(List.class)) {
    Method method = pd.getReadMethod();
    List list = (List) method.invoke(mc);
    list.add("Hello World!"); // change the passed String of course
}