设置POJO数据的最简单方法

Question

您好我正在寻找不逐一设置POJO类的所有值的方法。必须一次性调用setter。

我有这个POJO数据。

private int id;
private String newsfeedCategories;
private String lastName;
private String email;
private String mobile;
private String sendNotifications;
private String zipcode;
private String uniounSupplier;
private String unionContractor;
private String password;
private String lastUpdate;
private String deviceType;
private String firstName;
private String unionRep;
private String local;
private String deviceToken;
private String unionLegislator;
private String gender;
private String unionCarpenter;

当我调用Web服务时，我需要为每个值调用setter。有没有其他方法可以更好，更有效地设置整个数据。

以下是我设置POJO的代码

 Gson gson = new Gson();

            UserData response = new UserData(jObj);

            String json = gson.toJson(response);

            response = gson.fromJson(json, UserData.class);



            /* Data data1 = ParseManager.parseLoginResponse(result);

            UserManager.setLoginResponse(data1);

           Data d =  UserManager.getUer();*/

           /* Bundle bundle = getIntent().getExtras();
            Data userData = (Data) bundle.getParcelable("email");*/

            //Log.e("email Id is","-----------------"+ userData.getEmail());
            // here to set the parser class and fetch the result

            Data data = new Data();

            data.setId(response.getData().getId());
            data.setFirstName(response.getData().getFirstName());
            data.setLastName(response.getData().getLastName());
            data.setMobile(response.getData().getMobile());
            data.setEmail(response.getData().getEmail());
            data.setZipcode(response.getData().getZipcode());
            data.setGender(response.getData().getGender());
            data.setPassword(response.getData().getPassword());
            data.setUnionCarpenter(response.getData().getUnionCarpenter());
            data.setUnionRep(response.getData().getUnionRep());
            data.setLocal(response.getData().getLocal());
            data.setUnionContractor(response.getData().getUnionContractor());
            data.setUnionLegislator(response.getData().getUnionLegislator());
            data.setUniounSupplier(response.getData().getUniounSupplier());
            data.setNewsfeedCategories(response.getData().getNewsfeedCategories());
            data.setSendNotifications(response.getData().getSendNotifications());
            data.setLastUpdate(response.getData().getLastUpdate());

Answer 1

只需创建一个方法，您可以在其中设置每个值，并将所有值作为参数传递给此方法。

您只需要调用一种方法。

class YourPOJO {
    String var1, var2;
    int var3;
    .
    .
    .

    public void setData(String var1, String var2, int var3) {
        this.var1 = var1;
        this.var2 = var2;
        this.var3 = var3;
    }
}

Answer 2

您可以使用Jackson ObjectMapper

执行此操作

ObjectMapper mapper = new ObjectMapper();
SourceBean source = ...;
TargetBean target = mapper.convertValue(source, TargetBean.class);

为了获得最佳性能，最好使用getter和setter。但是，为了简化代码，您可以使用jackson

或者，如果你不介意使用apache库，那么来自Apache Commons的BeanUtils将很容易处理，使用

copyProperties(DestObject, SourceObject)。

Answer 3

您可以使用POJO的参数创建构造函数，并将所有数据传递给参数。

public class DummyPOJO{
private String data1;
private String data2;
.....

public DummyPOJO(String data1, String data2,....){
  this.data1=data1;
  this.data2=data2;
  ......
}   
}

如果你使用像android studio这样的任何IDE，你可以使用ALT+INS

直接创建一个带参数的构造函数

Answer 4

使用改造框架。 所以你可以轻松管理数据。并将其设置为适配器或者下面的一些代码。

 public interface RestClient {

 @FormUrlEncoded
 @POST("/order/order_list")
 void order(@Field("token") String token,
              @Field("page") String page,
              Callback<Home> callback);
}

首先创建如上所述的inarface而不是创建finalwrapper类

public class FinalWrapper<T> {
public final T value;

public FinalWrapper(T value) {
    this.value = value;
}
}

比使用RetrofitClient的其他文件创建名称

 public class RetrofitClient {
private final static String TAG = RetrofitClient.class.getSimpleName();

private static FinalWrapper<RetrofitClient> helperWrapper;
private static final Object LOCK = new Object();
private final RestClient mRestOkClient;


private RetrofitClient() {
    // Rest client without basic authorization
    mRestOkClient = ServiceGenerator.createService(RestClient.class);
}

/**
 * @return
 */
public static RetrofitClient getInstance() {
    FinalWrapper<RetrofitClient> wrapper = helperWrapper;

    if (wrapper == null) {
        synchronized (LOCK) {
            if (helperWrapper == null) {
                helperWrapper = new FinalWrapper<>(new RetrofitClient());
            }
            wrapper = helperWrapper;
        }
    }
    return wrapper.value;
}

public RestClient getRestOkClient() {
    return mRestOkClient;
}

}

最后创建服务ganarater

public class ServiceGenerator {
// No need to instantiate this class.
private ServiceGenerator() {
}

/**
 * @param serviceClass
 * @param <S>
 * @return
 */
public static <S> S createService(Class<S> serviceClass) {
    final OkHttpClient okHttpClient = new OkHttpClient();
    okHttpClient.setReadTimeout(Constant.CONNECTION_TIMEOUT, TimeUnit.SECONDS);
    okHttpClient.setConnectTimeout(Constant.CONNECTION_TIMEOUT, TimeUnit.SECONDS);

    RestAdapter.Builder builder = new RestAdapter.Builder()
            .setEndpoint(Constant.BASE_URL)
            .setLogLevel(RestAdapter.LogLevel.FULL)
            .setClient(new OkClient(okHttpClient));

    RestAdapter adapter = builder.build();


    return adapter.create(serviceClass);

}
}

并在您调用服务

的活动中

  public void orderApi() {
    if (Utility.checkInternetConnection(getContext())) {
        if (db == 1) {
            getMessageUtil().showProgressDialog();
        }
        RetrofitClient.getInstance().getRestOkClient().
                order(VPreferences.getAccessToken(getContext()),
                        String.valueOf(page),
                        callback);
    }
}

private final retrofit.Callback callback = new retrofit.Callback() {
    @Override
    public void success(Object object, Response response) {
        getMessageUtil().hideProgressDialog();
        Home home = (Home) object;
        if(home.getResult().equalsIgnoreCase("1")) {
            total = home.getOrders().getLast_page();
            homeOrderses.addAll(home.getOrders().getData());
            tabOrderAdapter = new TabOrderAdapter(getContext(), homeOrderses);
            if (db == 1) {
                rlOrder.setAdapter(tabOrderAdapter);
            } else {
                rlOrder.getAdapter().notifyDataSetChanged();
            }
        }
        else {
            Toast.makeText(getContext(), "First Login", Toast.LENGTH_SHORT).show();
            Intent intent = new Intent(getContext(), LoginActivity_.class);
            startActivity(intent);
            getActivity().finish();
        }

    }

    @Override
    public void failure(RetrofitError error) {
        Log.e("ERROR", error + "");
        getMessageUtil().hideProgressDialog();
    }
};

注意改装依赖

Answer 5

像这样创建POJO类......

public class GetAllStudentModel {
private int id;
private String name;
private String branch;
private ArrayList<GetAllStudentModel> list;
private String sem;
private String photo_url;
private String email;
private String mobile;
private String dob;
public GetAllStudentModel(int id, String name, String branch, String sem, String photo_url,String mobile, String email,String dob) {
    this.id = id;
    this.name = name;
    this.branch = branch;
    this.sem = sem;
    this.photo_url=photo_url;
    this.mobile = mobile;
    this.email = email;
    this.dob=dob;
}

public String getName() {
    return name;
}

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

public String getBranch() {
    return branch;
}

public void setBranch(String branch) {
    this.branch = branch;
}

public ArrayList<GetAllStudentModel> getList() {
    return list;
}

public void setList(ArrayList<GetAllStudentModel> list) {
    this.list = list;
}

public String getSem() {
    return sem;
}

public void setSem(String sem) {
    this.sem = sem;
}

public String getPhoto_url() {
    return photo_url;
}

public void setPhoto_url(String photo_url) {
    this.photo_url = photo_url;
}

public int getId() {
    return id;
}

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

public String getEmail() {
    return email;
}

public void setEmail(String email) {
    this.email = email;
}

public String getMobile() {
    return mobile;
}

public void setMobile(String mobile) {
    this.mobile = mobile;
}

public String getDob() {
    return dob;
}

public void setDob(String dob) {
    this.dob = dob;
}


}

并且像这样调用这个cunstructor ..

 try{
     JSONArray ja = response.getJSONArray(TAG_RESULTS);
     for(int i=0; i < ja.length(); i++){

          JSONObject jsonObject = ja.getJSONObject(i);
          id = Integer.parseInt(jsonObject.getString("id").toString());
          name = jsonObject.getString(TAG_NAME);
          branch = jsonObject.getString(TAG_BRANCH);
          sem = jsonObject.getString("semester");
          photo_url=jsonObject.getString("photo");
          email=jsonObject.getString("email");
          mobile=jsonObject.getString("mobile");
          dob=jsonObject.getString("dob");
          getAllStudentModel = new GetAllStudentModel(id,name,branch,sem,photo_url,email,mobile,dob);
          list.add(getAllStudentModel);
     }
 }catch(JSONException e){e.printStackTrace();}

Answer 6

您可以使用Gson将json转换为Map，如下所示     here： -

Type type = new TypeToken<Map<String, String>>(){}.getType();
Map<String, String> myMap = gson.fromJson("{'key1':'value1','key2':'value2'}", type);

您可以使用Apache Commons BeanUtils以非常干净的方式执行此操作。

从地图填充POJO javadoc以获取以下方法： -

org.apache.commons.beanutils.BeanUtils.populate(Object bean, Map properties)

Map键应该是POJO类中的属性或属性名称，在内部，此方法使用Java Reflection API来调用setter方法。

您的代码如下所示： -

String json = gson.toJson(response);
Type type = new TypeToken<Map<String, String>>(){}.getType();
Map<String, String> jsonMap= gson.fromJson(json , type);
Data data = new Data();
BeanUtils.populate(data , jsonMap);

Answer 7

基本上你的问题是将一个POJO映射到其他POJO。

您可以使用Dozer mapper。

Dozer Example

检查Dozer documentation here。