折射此代码的最佳方法？ package.com.example.moviesearch； 导入java.util.ArrayList； 导入org.json.JSONArray； 导入org.json.JSONException； 导入org.json.JSONObject； 导入android.util.Log； 公共类解析JSON{ 私人电影； 私人弦乐流派； 私人字符串额定值； 私有字符串语言； 私人内部评级； 私人国家； 私有字符串发布日期； 私有字符串标题； 私人董事； 私人弦乐演员； 私有字符串plot_simple； 私人弦乐海报； 私有字符串运行时； 私有字符串imdb_url； 公共ArrayList parseJson（字符串json）{ 电影=新的ArrayList（）； 试一试{ JSONArray jArray=新的JSONArray（json）； for（int i=0；i

我正在制作一个android应用程序，需要解析json数据。我将此json数据转换为自定义类。有时候我解析的json不存在，所以我必须为它输入一个默认值，我觉得这太残忍了。

还有一个方法

package com.example.moviesearch;

import java.util.ArrayList;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.util.Log;

public class ParseJSON {
    private ArrayList<Movie> movies;
    private String genres;
    private String rated;
    private String language;
    private int rating;
    private String country;
    private String release_date;
    private String title;
    private String directors;
    private String actors;
    private String plot_simple;
    private String poster;
    private String runtime;
    private String imdb_url;

    public ArrayList<Movie> parseJson(String json) {
        movies = new ArrayList<Movie>();
        try {
            JSONArray jArray = new JSONArray(json);
            for (int i = 0; i < jArray.length(); i++) {
                JSONObject j = jArray.getJSONObject(i);
                try {
                    genres = j.getString("genres").replace("[", "")
                            .replace("]", "").replaceAll("\"", "");
                } catch (Exception e) {
                    genres = "notfound";
                }
                try {
                    rated = j.getString("rated");
                } catch (Exception e) {
                    rated = "not found";
                }
                try {
                    language = j.getString("language").replace("[", "")
                            .replace("]", "").replaceAll("\"", "");
                } catch (Exception e) {
                    language = "notfound";
                }

                try {
                    rating = j.getInt("rating");
                } catch (Exception e) {
                    rating = 404;
                }

                try {
                    country = j.getString("country").replace("[", "")
                            .replace("]", "").replaceAll("\"", "");
                } catch (Exception e) {
                    country = "not found";
                }
                try {
                    release_date = j.getString("release_date");
                } catch (Exception e) {
                    release_date = "notfound";
                }
                try {
                    title = j.getString("title").replace("\n", "");
                } catch (Exception e) {
                    title = "notfound";
                }
                try {
                    directors = j.getString("directors").replace("[", "")
                            .replace("]", "").replaceAll("\"", "");
                } catch (Exception e) {
                    directors = "notfound";
                }
                try {
                    actors = j.getString("actors").replace("[", "")
                            .replace("]", "").replaceAll("\"", "");
                } catch (Exception e) {
                    actors = "notfound";
                }
                try {
                    plot_simple = j.getString("plot_simple");
                } catch (Exception e) {
                    poster = "notfound";
                }
                try {
                    JSONObject c = j.getJSONObject("poster");
                    poster = c.getString("cover");
                } catch (Exception e) {
                    poster = "notfound";
                }
                try {
                    runtime = j.getString("runtime").replace("[", "")
                            .replace("]", "").replaceAll("\"", "");
                } catch (Exception e) {
                    runtime = "notfound";
                }
                try {
                    imdb_url = j.getString("imdb_url");
                } catch (Exception e) {
                    imdb_url = "notfound";
                }
                Movie movie = new Movie(genres, rated, language, rating,
                        country, release_date, title, directors, actors,
                        plot_simple, poster, runtime, imdb_url);
                movies.add(movie);
            }

        } catch (JSONException e) {
            Log.e("jsonerror", "", e);
        }
        return movies;
    }
}

---

在这里，您可以为找不到值的情况传递一些默认值，这样您就不必在每次getString之后捕捉异常了！问题不应该有问号吗？我不知道reg exp会有什么帮助。无论哪种方式，我都必须检查json是否存在。你能提供一个例子吗？也许我理解错了。一个尝试捕获多个必要的异常，学习三元，并在适当的地方尝试optString（）方法。哇，正是我需要的，谢谢

j.optString("imdb_url", "notfound");