Question

我尝试制作自己的Java J2EE DAO。它一直给我404错误。我还尝试发送GET请求，再次出现404错误。我有所有正确的导入，web.xml，pom.xml等。我检查了那些。

我试图只获得＆＃34; ingredientnaam＆＃34;来自url / restservices / ingredients的DAO变量。使用Eclipse，有0个错误。

有人知道我可以编辑的功能DAO以适应我的DAO吗？或者有人看到我的代码中有任何错误吗？非常感谢。

IngredientResource.java

@Path("/ingredients")
public class IngredientResource {

    @GET
    @Produces("application/json")
    public String getIngredients() {
        IngredientService service = ServiceProvider.getIngredientService();
        JsonArray ingredientArray = buildJsonCountryArray(service.getAllIngredients());
        System.out.println(service.getAllIngredients());
        return ingredientArray.toString();
    }


    private JsonArray buildJsonCountryArray(List<Ingredient> ingredients) {
        JsonArrayBuilder jsonArrayBuilder = Json.createArrayBuilder();

        for (Ingredient c : ingredients) {
            JsonObjectBuilder job = Json.createObjectBuilder();

            job.add("ingredientnaam", c.getIngredientnaam());

            jsonArrayBuilder.add(job);
        }

        return jsonArrayBuilder.build();
    }
}

IngredientDAO.java

public class IngredientDAO extends BaseDAO {
    private IngredientDAO ingredientDAO = new IngredientDAO();

    private List<Ingredient> selectIngredients(String query) {
        List<Ingredient> results = new ArrayList<Ingredient>();

        try (Connection con = super.getConnection()) {
            Statement stmt = con.createStatement();
            ResultSet dbResultSet = stmt.executeQuery(query);

            while (dbResultSet.next()) {
                String ingredientnaam = dbResultSet.getString("ingredientnaam");
                Ingredient ingredient = ingredientDAO.findByString(ingredientnaam);

                Ingredient newIngredient = new Ingredient(ingredientnaam, 1, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0);

                results.add(newIngredient);
            }
        } catch (SQLException sqle) {
            sqle.printStackTrace();
        }

        return results;
    }

    public List<Ingredient> findAll() {
        return selectIngredients("SELECT ingredientId, name, account, FK_ingredientID FROM ingredient");
    }

    public Ingredient findByString(String ingredientId) {
        return selectIngredients("SELECT ingredientnaam FROM ingredient WHERE ingredientnaam = " +ingredientId).get(0);
    }
}

IngredientService.java

package voedseldagboek.dagboek.domain;

import java.util.List;

import voedseldagboek.dagboek.persistence.*;

public class IngredientService {
    private IngredientDAO ingredientDAO = new IngredientDAO();

    public List<Ingredient> getAllIngredients() {
        return ingredientDAO.findAll();
    }
}

ServiceProvider.java

package voedseldagboek.dagboek.domain;

public class ServiceProvider {
    private static IngredientService ingredientService = new IngredientService();

    public static IngredientService getIngredientService() {
        return ingredientService;
    }
}

J2EE DAO给出了404错误

0 个答案: