Question

我正在尝试在codenameone应用程序中使用mirah进行JSON到POJO映射。当我想映射一个简单的JSON时，它可以工作
{"id":"1","name":"foo","classification":"10"}
有了这堂课：

public class Brand {
    private String id; 
    private String name;
    private String classification;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getClassification() {
        return classification;
    }

    public void setClassification(String classification) {
        this.classification = classification;
    }    
}

现在我想把它包装在一个Message Object中，我有一个品牌列表：

import java.util.List;

public class Message { 
    public List<Brand> brands;

    public List<Brand> getBrands() {
        return brands;
    }

    public void setBrands(List<Brand> brands) {
        this.brands = brands;
    }        
}

我使用这个Mirah脚本进行映射：

data_mapper Message:MessageMapper
data_mapper Brand:BrandMapper

像shannah描述的那样here。

我的代码，我称之为Webservice：

    MessageMapper scheduleMapper = new MessageMapper();
    DataMapper.createContext(Arrays.asList(
            scheduleMapper,
            new BrandMapper()
        ), new DataMapper.Decorator() {

        public void decorate(DataMapper mapper) {
            mapper.setReadKeyConversions(Arrays.asList(DataMapper.CONVERSION_NONE));
        }
    });



    try {
    Message  message = scheduleMapper.readJSONFromURL("http://localhost/php-REST-DigitaleMusterplatte/api.php/brands", Message.class);
        System.out.println(message);
    } catch (IOException ex) {
        Log.e(ex);
    }

这是json的回应：
{"brands":[{"id":"1","name":"foo","classification":"10"},{"id":"2","name":"bar","classification":"20"}]}

我得到了这个例外：

java.lang.RuntimeException: Failed to get key brands for class interface java.util.List because it was not a registered object type
at ca.weblite.codename1.mapper.DataMapper.get(DataMapper.java:507)
at com.mycompany.app.dmp.models.MessageMapper.readMap(/Volumes/Windows VMS/Documents/Shared/NetBeansProjects/mirah_macro_utils/MirahMacroUtils/src/ca/weblite/mirah/utils/DataMapperBuilder.mirah)
at ca.weblite.codename1.mapper.DataMapper.readMap(DataMapper.java:719)
at ca.weblite.codename1.mapper.DataMapper.readJSON(DataMapper.java:780)
at ca.weblite.codename1.mapper.DataMapper.readJSON(DataMapper.java:792)
at ca.weblite.codename1.mapper.DataMapper.readJSONFromConnection(DataMapper.java:767)
at ca.weblite.codename1.mapper.DataMapper.readJSONFromURL(DataMapper.java:754)
at com.mycompany.myapp.MyApplication.start(MyApplication.java:96)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at com.codename1.impl.javase.Executor$1$1.run(Executor.java:123)
at com.codename1.ui.Display.processSerialCalls(Display.java:1152)
at com.codename1.ui.Display.mainEDTLoop(Display.java:969)
at com.codename1.ui.RunnableWrapper.run(RunnableWrapper.java:120)
at com.codename1.impl.CodenameOneThread.run(CodenameOneThread.java:176)

演示应用程序OSCONScheduler正常工作。

Answer 1

这看起来像个错误。但请尝试将brands更改为private而不是public。可能会对是否使用您的访问者/可变或使用公共变量感到困惑。

使用Mirah为Codename One反序列化对象列表

1 个答案: