我试图从json字符串中解析数字并将它们打印到文件中。
但为此我想访问一个数组内的元素，这个元素碰巧有另一个像结构这样的对象，对于像我这样的初学者来说这很混乱。
我在java中尝试这个，所以任何帮助都会受到赞赏。
这是json字符串
{
"result": [{
"landmark": {
"mouth_upper_lip_left_contour2": {
"y": 69.744333,
"x": 38.365625
},
"contour_chin": {
"y": 96.31,
"x": 51.339375
},
"mouth_lower_lip_right_contour3": {
"y": 80.073667,
"x": 60.077292
},
"contour_right9": {
"y": 94.413333,
"x": 63.012917
},
"mouth_upper_lip_left_contour1": {
"y": 69.0625,
"x": 47.247917
},
"right_eyebrow_lower_middle": {
"y": 31.333167,
"x": 73.863333
},
"left_eyebrow_lower_middle": {
"y": 31.549,
"x": 27.828542
},
"mouth_upper_lip_left_contour3": {
"y": 71.7415,
"x": 41.557292
},
"left_eyebrow_lower_left_quarter": {
"y": 31.958833,
"x": 21.760625
},
"right_eyebrow_lower_left_quarter": {
"y": 32.3125,
"x": 67.909583
},
"right_eyebrow_lower_right_quarter": {
"y": 31.311333,
"x": 80.055208
},
"nose_contour_left1": {
"y": 42.271667,
"x": 45.802083
},
"left_eyebrow_upper_left_quarter": {
"y": 30.283333,
"x": 21.247083
},
"left_eye_bottom": {
"y": 43.398167,
"x": 31.089375
},
"mouth_lower_lip_bottom": {
"y": 81.3855,
"x": 50.812708
},
"contour_right7": {
"y": 85.205167,
"x": 78.894583
},
"left_eyebrow_left_corner": {
"y": 33.749,
"x": 16.962646
},
"contour_right6": {
"y": 79.771833,
"x": 84.246042
},
"right_eye_lower_right_quarter": {
"y": 41.866667,
"x": 75.888542
},
"right_eye_bottom": {
"y": 42.5745,
"x": 71.683333
},
"contour_left7": {
"y": 85.123167,
"x": 24.153542
},
"contour_left6": {
"y": 78.593667,
"x": 18.146583
},
"contour_left5": {
"y": 72.296667,
"x": 13.481042
},
"contour_left4": {
"y": 64.880833,
"x": 10.959458
},
"contour_left3": {
"y": 57.225667,
"x": 9.674896
},
"contour_left2": {
"y": 50.2025,
"x": 8.638583
},
"contour_left1": {
"y": 41.911,
"x": 9.503813
},
"left_eye_lower_left_quarter": {
"y": 42.6945,
"x": 26.42125
},
"contour_right1": {
"y": 41.189833,
"x": 92.211458
},
"contour_right3": {
"y": 57.5375,
"x": 92.1
},
"contour_right2": {
"y": 48.95,
"x": 92.823542
},
"contour_right5": {
"y": 72.925333,
"x": 88.356458
},
"contour_right4": {
"y": 65.2235,
"x": 90.749583
},
"contour_left9": {
"y": 94.546667,
"x": 40.728333
},
"contour_left8": {
"y": 90.514667,
"x": 31.56625
},
"nose_right": {
"y": 60.715333,
"x": 64.148125
},
"right_eye_upper_right_quarter": {
"y": 39.302,
"x": 75.846042
},
"nose_contour_right3": {
"y": 62.9135,
"x": 57.44375
},
"nose_contour_lower_middle": {
"y": 64.059167,
"x": 50.642083
},
"right_eye_top": {
"y": 38.7445,
"x": 71.181458
},
"right_eye_right_corner": {
"y": 41.363,
"x": 78.832917
},
"mouth_upper_lip_right_contour1": {
"y": 69.000667,
"x": 55.375625
},
"mouth_upper_lip_right_contour2": {
"y": 69.407167,
"x": 63.850833
},
"mouth_upper_lip_right_contour3": {
"y": 71.284167,
"x": 62.032292
},
"left_eye_left_corner": {
"y": 41.623,
"x": 22.466042
},
"mouth_right_corner": {
"y": 70.449333,
"x": 72.33625
},
"mouth_lower_lip_right_contour1": {
"y": 75.625667,
"x": 63.582708
},
"contour_right8": {
"y": 90.280167,
"x": 70.933958
},
"left_eyebrow_right_corner": {
"y": 33.2645,
"x": 40.150417
},
"right_eye_center": {
"y": 40.730667,
"x": 71.312917
},
"left_eye_upper_right_quarter": {
"y": 39.773333,
"x": 35.361667
},
"mouth_upper_lip_top": {
"y": 69.256833,
"x": 51.340625
},
"nose_left": {
"y": 60.0965,
"x": 37.100625
},
"left_eye_upper_left_quarter": {
"y": 39.500833,
"x": 26.438542
},
"left_eye_center": {
"y": 41.167667,
"x": 30.930833
},
"left_eye_lower_right_quarter": {
"y": 42.8465,
"x": 35.399167
},
"right_eyebrow_left_corner": {
"y": 33.184833,
"x": 61.318958
},
"right_eye_left_corner": {
"y": 42.366333,
"x": 62.163958
},
"mouth_lower_lip_top": {
"y": 77.392833,
"x": 51.08625
},
"right_eyebrow_right_corner": {
"y": 32.929667,
"x": 84.607917
},
"mouth_lower_lip_left_contour1": {
"y": 75.426833,
"x": 40.790625
},
"left_eye_pupil": {
"y": 40.962,
"x": 32.3075
},
"mouth_left_corner": {
"y": 70.978333,
"x": 31.551458
},
"right_eyebrow_upper_left_quarter": {
"y": 29.9845,
"x": 67.1625
},
"right_eyebrow_upper_right_quarter": {
"y": 29.779167,
"x": 79.733125
},
"right_eye_lower_left_quarter": {
"y": 42.326333,
"x": 66.72625
},
"nose_tip": {
"y": 58.352833,
"x": 50.439375
},
"right_eye_upper_left_quarter": {
"y": 39.570333,
"x": 66.551458
},
"left_eyebrow_upper_middle": {
"y": 29.425833,
"x": 28.171667
},
"mouth_lower_lip_right_contour2": {
"y": 75.885167,
"x": 67.871875
},
"mouth_lower_lip_left_contour3": {
"y": 80.028667,
"x": 41.727292
},
"nose_contour_left2": {
"y": 54.835333,
"x": 41.098125
},
"nose_contour_left3": {
"y": 62.931167,
"x": 43.509375
},
"nose_contour_right1": {
"y": 42.119,
"x": 56.340625
},
"nose_contour_right2": {
"y": 54.3045,
"x": 60.037917
},
"mouth_lower_lip_left_contour2": {
"y": 75.988833,
"x": 36.259375
},
"right_eyebrow_upper_middle": {
"y": 29.119333,
"x": 73.216875
},
"left_eyebrow_lower_right_quarter": {
"y": 32.342667,
"x": 33.74875
},
"left_eye_top": {
"y": 38.792167,
"x": 30.875208
},
"left_eye_right_corner": {
"y": 42.65,
"x": 39.908958
},
"left_eyebrow_upper_right_quarter": {
"y": 29.944333,
"x": 34.1775
},
"right_eye_pupil": {
"y": 40.599833,
"x": 71.348542
},
"mouth_upper_lip_bottom": {
"y": 72.635667,
"x": 51.448125
}
},
"face_id": "4d78dafb9aec7f8f9e2c0c79bebebfc1"
}],
"session_id": "8d8947da289b4beda33882f4fc8fe680"
}
这是我的java代码，它在第18行之前工作正常，但不幸的是它在第19行给了我一个例外
package faceplus;
import org.json.JSONArray;
import org.json.JSONObject;
import java.io.File;
import org.apache.commons.io.FileUtils;
public class FacePlus {
@SuppressWarnings("unchecked")
public static void main(String[] args) {
try {
File file = new File("C:\\Users\\sandesh\\Documents\\NetBeansProjects\\FacePlusPlus\\src\\faceplusplus\\file1.json");
String s1 = FileUtils.readFileToString(file);
JSONObject root = new JSONObject(s1);
JSONArray sportsArray = root.getJSONArray("result");
JSONObject landmark = sportsArray.getJSONObject(0);
JSONObject mouth_upper_lip_left_contour2 = landmark.getJSONObject("mouth_upper_lip_left_contour2");
} catch (Exception e) {
e.printStackTrace();
}
}
}
这是个例外
`run:
org.json.JSONException: JSONObject["mouth_upper_lip_left_contour2"] not found.
at org.json.JSONObject.get(JSONObject.java:475)
at org.json.JSONObject.getJSONObject(JSONObject.java:640)
at faceplus.FacePlus.main(FacePlus.java:18)
BUILD SUCCESSFUL (total time: 0 seconds)`
香港专业教育学院印刷了看似很好的标志性物品，我也尝试输出属性＆＃34; face_id＆＃34;
String id = landmark.getString("face_id");
System.out.println(landmark.toString());
System.out.println(id);
这给出了输出：
{＆＃34; face_id＆＃34;：＆＃34; 4d78dafb9aec7f8f9e2c0c79bebebfc1＆＃34;＆＃34;界标＆＃34; {＆＃34; left_eyebrow_lower_left_quarter＆＃34; {＆＃34; X＆＃34;：21.760625， ＆＃34; Y＆＃34;：31.958833}＆＃34; left_eye_lower_right_quarter＆＃34; {＆＃34; X＆＃34;：35.399167，＆＃34; Y＆＃34;：42.8465}＆＃34; left_eye_top＆ ＃34; {＆＃34; X＆＃34;：30.875208，＆＃34; Y＆＃34;：38.792167}＆＃34; right_eye_left_corner＆＃34; {＆＃34; X＆＃34;：62.163958，＆ ＃34; Y＆＃34;：42.366333}＆＃34; left_eye_pupil＆＃34; {＆＃34; X＆＃34;：32.3075＆＃34; Y＆＃34;：40.962}＆＃34; right_eyebrow_lower_middle＆＃ 34;：{＆＃34; X＆＃34;：73.863333，＆＃34; Y＆＃34;：31.333167}＆＃34; left_eye_upper_right_quarter＆＃34; {＆＃34; X＆＃34;：35.361667，＆＃ 34; Y＆＃34;：39.773333}＆＃34; mouth_lower_lip_left_contour1＆＃34; {＆＃34; X＆＃34;：40.790625，＆＃34; Y＆＃34;：75.426833}＆＃34; right_eye_top＆＃34 ;：{＆＃34; X＆＃34;：71.181458，＆＃34; Y＆＃34;：38.7445}＆＃34; mouth_lower_lip_left_contour3＆＃34; {＆＃34; X＆＃34;：41.727292，＆＃34 ; Y＆＃34;：80.028667}＆＃34; mouth_lower_lip_left_contour2＆＃34; {＆＃34; X＆＃34;：36.259375，＆＃34; Y＆＃34;：75.988833}＆＃34; right_eye_bottom＆＃34; ：{＆＃34; X＆＃34 ;: 71.683333，＆＃34; Y＆＃34;：42.5745}＆＃34; nose_contour_right3＆＃34; {＆＃34; X＆＃34;：57.44375＆＃34; Y＆＃34;：62.9135}＆＃34 ; right_eye_upper_right_quarter＆＃34; {＆＃34; X＆＃34;：75.846042，＆＃34; Y＆＃34;：39.302}＆＃34; nose_contour_right1＆＃34; {＆＃34; X＆＃34;：56.340625 ＆＃34; Y＆＃34;：42.119}＆＃34; nose_contour_right2＆＃34; {＆＃34; X＆＃34;：60.037917，＆＃34; Y＆＃34;：54.3045}＆＃34; left_eye_right_corner＆＃34; {＆＃34; X＆＃34;：39.908958，＆＃34; Y＆＃34;：42.65}＆＃34; nose_tip＆＃34; {＆＃34; X＆＃34;：50.439375， ＆＃34; Y＆＃34;：58.352833}＆＃34; right_eyebrow_upper_middle＆＃34; {＆＃34; X＆＃34;：73.216875，＆＃34; Y＆＃34;：29.119333}＆＃34; mouth_lower_lip_right_contour1＆ ＃34; {＆＃34; X＆＃34;：63.582708，＆＃34; Y＆＃34;：75.625667}＆＃34; nose_contour_left3＆＃34; {＆＃34; X＆＃34;：43.509375，＆ ＃34; Y＆＃34;：62.931167}＆＃34; mouth_lower_lip_right_contour2＆＃34; {＆＃34; X＆＃34;：67.871875，＆＃34; Y＆＃34;：75.885167}＆＃34; nose_contour_left2＆＃ 34;：{＆＃34; X＆＃34;：41.098125，＆＃34; Y＆＃34;：54.835333}＆＃34; mouth_lower_lip_right_contour3＆＃34; {＆＃34; X＆＃34;：60.077292，＆＃ 34; Y＆＃34;：80.073667}＆＃34; mouth_upper_lip_left_contour 3＆＃34; {＆＃34; X＆＃34;：41.557292，＆＃34; Y＆＃34;：71.7415}＆＃34; nose_contour_left1＆＃34; {＆＃34; X＆＃34;：45.802083， ＆＃34; Y＆＃34;：42.271667}＆＃34; mouth_upper_lip_bottom＆＃34; {＆＃34; X＆＃34;：51.448125，＆＃34; Y＆＃34;：72.635667}＆＃34; left_eyebrow_lower_middle＆ ＃34; {＆＃34; X＆＃34;：27.828542，＆＃34; Y＆＃34;：31.549}＆＃34; right_eye_lower_left_quarter＆＃34; {＆＃34; X＆＃34;：66.72625，＆ ＃34; Y＆＃34;：42.326333}＆＃34; left_eyebrow_upper_left_quarter＆＃34; {＆＃34; X＆＃34;：21.247083，＆＃34; Y＆＃34;：30.283333}＆＃34; mouth_upper_lip_left_contour1＆＃ 34;：{＆＃34; X＆＃34;：47.247917，＆＃34; Y＆＃34;：69.0625}＆＃34; mouth_upper_lip_left_contour2＆＃34; {＆＃34; X＆＃34;：38.365625，＆＃ 34; Y＆＃34;：69.744333}＆＃34; contour_chin＆＃34; {＆＃34; X＆＃34;：51.339375，＆＃34; Y＆＃34;：96.31}＆＃34; right_eye_center＆＃34 ;：{＆＃34; X＆＃34;：71.312917，＆＃34; Y＆＃34;：40.730667}＆＃34; left_eye_center＆＃34; {＆＃34; X＆＃34;：30.930833，＆＃34 ; Y＆＃34;：41.167667}＆＃34; right_eyebrow_upper_right_quarter＆＃34; {＆＃34; X＆＃34;：79.733125，＆＃34; Y＆＃34;：29.779167}＆＃34; contour_right7＆＃34; ：{＆＃34; X＆＃34;：78.894583，＆＃34; Y＆＃34;：85.205167}，＆＃3 4; left_eye_lower_left_quarter＆＃34; {＆＃34; X＆＃34;：26.42125＆＃34; Y＆＃34;：42.6945}＆＃34; mouth_right_corner＆＃34; {＆＃34; X＆＃34 ;: 72.33625＆＃34; Y＆＃34;：70.449333}＆＃34; contour_right8＆＃34; {＆＃34; X＆＃34;：70.933958，＆＃34; Y＆＃34;：90.280167}＆＃34 ; contour_right9＆＃34; {＆＃34; X＆＃34;：63.012917，＆＃34; Y＆＃34;：94.413333}＆＃34; right_eyebrow_upper_left_quarter＆＃34; {＆＃34; X＆＃34;：67.1625 ＆＃34; Y＆＃34;：29.9845}＆＃34; right_eye_right_corner＆＃34; {＆＃34; X＆＃34;：78.832917，＆＃34; Y＆＃34;：41.363}＆＃34; left_eyebrow_lower_right_quarter＆＃34; {＆＃34; X＆＃34;：33.74875＆＃34; Y＆＃34;：32.342667}＆＃34; right_eyebrow_right_corner＆＃34; {＆＃34; X＆＃34;：84.607917， ＆＃34; Y＆＃34;：32.929667}＆＃34; nose_left＆＃34; {＆＃34; X＆＃34;：37.100625，＆＃34; Y＆＃34;：60.0965}＆＃34; mouth_lower_lip_top＆ ＃34; {＆＃34; X＆＃34;：51.08625＆＃34; Y＆＃34;：77.392833}＆＃34; right_eye_pupil＆＃34; {＆＃34; X＆＃34;：71.348542，＆ ＃34; Y＆＃34;：40.599833}＆＃34; mouth_upper_lip_right_contour2＆＃34; {＆＃34; X＆＃34;：63.850833，＆＃34; Y＆＃34;：69.407167}＆＃34; left_eyebrow_upper_middle＆＃ 34;：{＆＃34; X＆＃34;：28.171667，＆＃34; Y＆＃34;：29.42 5833}，＆＃34; mouth_upper_lip_right_contour3＆＃34; {＆＃34; X＆＃34;：62.032292，＆＃34; Y＆＃34;：71.284167}＆＃34; mouth_upper_lip_right_contour1＆＃34; {＆＃34; X＆＃34;：55.375625，＆＃34; Y＆＃34;：69.000667}＆＃34; mouth_upper_lip_top＆＃34; {＆＃34; X＆＃34;：51.340625，＆＃34; Y＆＃34;：69.256833 }，＆＃34; right_eye_lower_right_quarter＆＃34; {＆＃34; X＆＃34;：75.888542，＆＃34; Y＆＃34;：41.866667}＆＃34; mouth_left_corner＆＃34; {＆＃34; X＆ ＃34;：31.551458，＆＃34; Y＆＃34;：70.978333}＆＃34; left_eye_left_corner＆＃34; {＆＃34; X＆＃34;：22.466042，＆＃34; Y＆＃34;：41.623} ＆＃34; nose_contour_lower_middle＆＃34; {＆＃34; X＆＃34;：50.642083，＆＃34; Y＆＃34;：64.059167}＆＃34; right_eyebrow_left_corner＆＃34; {＆＃34; X＆＃ 34;：61.318958，＆＃34; Y＆＃34;：33.184833}＆＃34; right_eyebrow_lower_left_quarter＆＃34; {＆＃34; X＆＃34;：67.909583，＆＃34; Y＆＃34;：32.3125} ＆＃34; right_eyebrow_lower_right_quarter＆＃34; {＆＃34; X＆＃34;：80.055208，＆＃34; Y＆＃34;：31.311333}＆＃34; left_eyebrow_left_corner＆＃34; {＆＃34; X＆＃34 ;：16.962646，＆＃34; Y＆＃34;：33.749}＆＃34; contour_left4＆＃34; {＆＃34; X＆＃34;：10.959458，＆＃34; Y＆＃34;：64.880833}，＆ ＃34; contour_left5＆＃3 4;：{＆＃34; X＆＃34;：13.481042，＆＃34; Y＆＃34;：72.296667}＆＃34; left_eye_upper_left_quarter＆＃34; {＆＃34; X＆＃34;：26.438542，＆＃ 34; Y＆＃34;：39.500833}＆＃34; contour_left6＆＃34; {＆＃34; X＆＃34;：18.146583，＆＃34; Y＆＃34;：78.593667}＆＃34; contour_left7＆＃34 ;：{＆＃34; X＆＃34;：24.153542，＆＃34; Y＆＃34;：85.123167}＆＃34; contour_left8＆＃34; {＆＃34; X＆＃34;：31.56625＆＃34 ; Y＆＃34;：90.514667}＆＃34; contour_left9＆＃34; {＆＃34; X＆＃34;：40.728333，＆＃34; Y＆＃34;：94.546667}＆＃34; mouth_lower_lip_bottom＆＃34; ：{＆＃34; X＆＃34;：50.812708，＆＃34; Y＆＃34;：81.3855}＆＃34; left_eye_bottom＆＃34; {＆＃34; X＆＃34;：31.089375，＆＃34; ý＆＃34;：43.398167}＆＃34; left_eyebrow_right_corner＆＃34; {＆＃34; X＆＃34;：40.150417，＆＃34; Y＆＃34;：33.2645}＆＃34; right_eye_upper_left_quarter＆＃34 ;: {＆＃34; X＆＃34;：66.551458，＆＃34; Y＆＃34;：39.570333}＆＃34; contour_right1＆＃34; {＆＃34; X＆＃34;：92.211458，＆＃34; Y＆ ＃34;：41.189833}＆＃34; contour_right2＆＃34; {＆＃34; X＆＃34;：92.823542，＆＃34; Y＆＃34;：48.95}＆＃34; nose_right＆＃34;：{ ＆＃34; X＆＃34;：64.148125，＆＃34; Y＆＃34;：60.715333}＆＃34; contour_right3＆＃34; {＆＃34; X＆＃34;：92.1，＆＃34; Y＆＃ 34;：57.5375}＆＃34; contour_left1＆＃34; {＆＃34; X＆＃34;：9.503813，＆＃34; Y＆＃34;：41.911}＆＃34; contour_right4＆＃34; {＆＃34; X＆＃34;：90.749583， ＆＃34; Y＆＃34;：65.2235}＆＃34; contour_left2＆＃34; {＆＃34; X＆＃34;：8.638583，＆＃34; Y＆＃34;：50.2025}＆＃34; contour_right5＆ ＃34; {＆＃34; X＆＃34;：88.356458，＆＃34; Y＆＃34;：72.925333}＆＃34; contour_right6＆＃34; {＆＃34; X＆＃34;：84.246042，＆ ＃34; Y＆＃34;：79.771833}＆＃34; contour_left3＆＃34; {＆＃34; X＆＃34;：9.674896，＆＃34; Y＆＃34;：57.225667}＆＃34; left_eyebrow_upper_right_quarter＆＃ 34;：{＆＃34; X＆＃34;：34.1775＆＃34; Y＆＃34;：29.944333}}}
4d78dafb9aec7f8f9e2c0c79bebebfc1
答案 0 :(得分：3)
你可以尝试这个代码块：
try {
File file = new File("D:\\prectice\\JSONPrectice\\file.json");
String s1 = FileUtils.readFileToString(file);
JSONObject root = new JSONObject(s1);
JSONArray sportsArray = root.getJSONArray("result");
JSONObject arrayObject = sportsArray.getJSONObject(0);
JSONObject landmark = arrayObject.getJSONObject("landmark");
JSONObject mouth_upper_lip_left_contour2 = landmark.getJSONObject("mouth_upper_lip_left_contour2");
} catch (Exception e) {
e.printStackTrace();
}
你错过了JSONObject的标志性