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我正在尝试从对象集合（标签）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，它从主对象中过滤出所需的字段。

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。List fieldList 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。我正在使用 javabean PropertyDescriptor 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，而是您必须使用 getList().add(object)。我如何实现这一点？

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("\n\nPrinting 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;
    }
}

如您所见，问题在于设置 adskContentGroup 值。

任何指针将不胜感激。

谢谢

4

1 回答 1

2

这是你要找的吗？

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
}
于 2013-06-25T02:46:58.570 回答