[英]JSON API Parsing Issue
我创建了一个GUI,其中列出了Hydra电影数据库API中列出的最高和最低评级的电影。 当我使用Compare.Comparing和parseInt解析它以找到IMDB的最大和最小评级时,我得到了数字格式异常。 我将max更改为parseDouble只是为了看看是否有帮助,并且得到了空指针异常。
我正在放置特别相关的代码和错误,但是如果您想获得更好的完整图片,请访问GitHub上的项目链接: https : //github.com/scohen40/cohen-mcw152-MovieDatabaseJSON/tree/ bugFixing / src目录/ movieDatabaseApp /电影
这是我的控制器的代码:
package movieDatabaseApp.movie;
import java.awt.event.ActionEvent;
import java.util.Comparator;
import java.util.List;
import java.util.Optional;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import javax.swing.text.JTextComponent;
import com.google.inject.Inject;
public class MovieController {
private MovieView view;
private MovieService service;
@Inject
public
MovieController(MovieView view, MovieService service) {
this.view = view;
this.service = service;
}
public void refreshData() {
requestHighest2018();
requestLowest2018();
}
public void requestHighest2018() {
requestHighestMovies(service.getAllMovies(),
// requestHighestMovies(service.getMovies2018(),
view.gethTitleField(),
view.gethYearField(),
view.gethRatingField(),
view.gethLanguageField());
}
void requestLowest2018() {
requestLowestMovies(service.getAllMovies(),
// requestLowestMovies(service.getMovies2018(),
view.getlTitleField(),
view.getlYearField(),
view.getlRatingField(),
view.getlLanguageField());
}
private void requestHighestMovies(Call<List<Movie>> call,
JTextComponent title,
JTextComponent year,
JTextComponent rating,
JTextComponent language)
{
call.enqueue(new Callback<List<Movie>>() {
@Override
public void onResponse(Call<List<Movie>> call, Response<List<Movie>> response) {
List<Movie> list = response.body();
showHighest(list, title, year, rating, language);
}
@Override
public void onFailure(Call<List<Movie>> arg0, Throwable t) {
t.printStackTrace();
}
});
}
private void requestLowestMovies(Call<List<Movie>> call,
JTextComponent title,
JTextComponent year,
JTextComponent rating,
JTextComponent language)
{
call.enqueue(new Callback<List<Movie>>() {
@Override
public void onResponse(Call<List<Movie>> call, Response<List<Movie>> response) {
List<Movie> list = response.body();
showLowest(list, title, year, rating, language);
}
@Override
public void onFailure(Call<List<Movie>> arg0, Throwable t) {
t.printStackTrace();
}
});
}
public void showHighest(List<Movie> list,
JTextComponent title,
JTextComponent year,
JTextComponent rating,
JTextComponent language)
{
Optional<Movie> highest = list.stream()
.max(Comparator.comparingDouble(e -> Double.parseDouble(e.getImdb_rating())));
title.setText(String.valueOf(highest.get().getTitle()));
year.setText(String.valueOf(highest.get().getMovie_year()));
rating.setText(String.valueOf(highest.get().getImdb_rating()));
language.setText(String.valueOf(highest.get().getLanguage()));
}
void showLowest(List<Movie> list,
JTextComponent title,
JTextComponent year,
JTextComponent rating,
JTextComponent language)
{
Optional<Movie> lowest = list.stream()
.min(Comparator.comparing(e -> Integer.parseInt(e.getImdb_rating())));
title.setText(String.valueOf(lowest.get().getTitle()));
year.setText(String.valueOf(lowest.get().getMovie_year()));
rating.setText(String.valueOf(lowest.get().getImdb_rating()));
language.setText(String.valueOf(lowest.get().getMovie_year()));
}
}
这是我最大解析度为double,最小解析度为int的错误:
java.lang.NullPointerException
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1838)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at movieDatabaseApp.movie.MovieController.lambda$0(MovieController.java:109)
at java.util.Comparator.lambda$comparingDouble$8dcf42ea$1(Comparator.java:532)
at java.util.function.BinaryOperator.lambda$maxBy$1(BinaryOperator.java:74)
at java.util.stream.ReduceOps$2ReducingSink.accept(ReduceOps.java:123)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:479)
at java.util.stream.ReferencePipeline.max(ReferencePipeline.java:515)
at movieDatabaseApp.movie.MovieController.showHighest(MovieController.java:109)
at movieDatabaseApp.movie.MovieController$1.onResponse(MovieController.java:65)
at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:123)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:153)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
java.lang.NumberFormatException:对于输入字符串:“ 7.4”
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:580)
at java.lang.Integer.parseInt(Integer.java:615)
at movieDatabaseApp.movie.MovieController.lambda$1(MovieController.java:124)
at java.util.Comparator.lambda$comparing$77a9974f$1(Comparator.java:469)
at java.util.function.BinaryOperator.lambda$minBy$0(BinaryOperator.java:59)
at java.util.stream.ReduceOps$2ReducingSink.accept(ReduceOps.java:123)
at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1380)
at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.util.stream.ReferencePipeline.reduce(ReferencePipeline.java:479)
at java.util.stream.ReferencePipeline.min(ReferencePipeline.java:520)
at movieDatabaseApp.movie.MovieController.showLowest(MovieController.java:124)
at movieDatabaseApp.movie.MovieController$2.onResponse(MovieController.java:89)
at retrofit2.OkHttpCall$1.onResponse(OkHttpCall.java:123)
at okhttp3.RealCall$AsyncCall.execute(RealCall.java:153)
at okhttp3.internal.NamedRunnable.run(NamedRunnable.java:32)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
我是JSON API集成的新手,所以我真的不知道该主题的错误是什么意思,或者什么是正常的。 任何帮助,将不胜感激。
还-这是解析后的原始JSON(如果您想查看的话): https : //hydramovies.com/api-v2/?source=http : //hydramovies.com/api-v2/current -电影- Data.csv
我认为此错误与JSON无关。 您之所以获得NPE或NFE,是因为列表中的一部或多部电影没有IMDB分级,或者分级中带有小数位数,不能进行整数分析,
更新:我最终将imdb_ratings的数据类型从String切换为Double,并取出了过滤器和解析器。 现在可以了!
您可以在上面列出的我的GitHub上浏览它。
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