Question

我有类，没有公共构造函数（dicts，项目在java 1.4中开始编写，没有枚举）。

@SpringContextAvailableDict(alias="a")
public class Class1 extends Dict<Object> {

    protected String code;
    protected String title;


    public final static Class1 NULL = new Class1(null, null, Dict.NAME_NULL);
    public final static Class1 FOO = new Class1("0", "e", "name1");
    public final static Class1 BAR = new Class1("1", "j", "name2",);

    private Class1(String code, String letterCode, String title) {
        this.code = code;
        this.title = title;
    }
}

我想初始化像

这样的bean

<bean parent="dict-wrapper-value" p:value="a_FOO"/>

我创建了这个类

public class StringToDictConverter extends PropertyEditorSupport {

protected Map<String, Class<?>> dicts = new HashMap<String, Class<?>>();

public StringToDictConverter() throws ClassNotFoundException{
    ClassPathScanningCandidateComponentProvider scanner 
                = new ClassPathScanningCandidateComponentProvider(false);
    scanner.addIncludeFilter(
                  new AnnotationTypeFilter(SpringContextAvailableDict.class));
    for (BeanDefinition bd : scanner.findCandidateComponents("exmpl/*")){
     // puting bd's class to dicts on key annotation parament 'alias'; 
    }
}

@Override
public void setAsText(String text) throws IllegalArgumentException {
        String[] name = text.split("_", 2);
    setValue(dicts.get(name[0]).getField(name[1]).get(new Object()))
}
}

使用dict的类将字符串转换为dict，但我希望使用像<context:annotation-config/＆gt;这样的spring xml配置来获取类描述，但是<context:annotation-config/＆gt;试图获取类的实例，它没有公共构造函数。

Answer 1

您不能简单地创建此类的实例。您需要一个（Spring）工厂来创建对象。

Spring注释扫描标记

1 个答案: