使用snakeyaml（import junit library）将.yml文件加载到哈希映射 [英] Load .yml file into hashmaps using snakeyaml (import junit library)
问题描述
我正在尝试将opencv的.yml文件加载到arrayLists的意思，投影和标签中。我创建了这三个arraylists，我正在尝试将.yml文件中的元素解析为它们。我找到了 snakeYAML文档。但是我没有找到适当的方法。我正在尝试使用
I am trying to load opencv's .yml file into arrayLists mean, projection and labels. I ve create those three arraylists and I am trying to parse into them the elements from the .yml file. I ve found snakeYAML documentation . However I didnt find a way to do so properly. I am trying to use
final String fileName = "train.yml";
opencvmatrix mat = new opencvmatrix();
Yaml yaml = new Yaml();
try {
InputStream ios = new FileInputStream(new File(fileName));
// Parse the YAML file and return the output as a series of Maps and Lists
Map<String,Object> result = (Map<String,Object>)yaml.load(ios);
System.out.println(result.toString());
Collection<Object> file = result.values();
} catch (Exception e) {
e.printStackTrace();
}
}
我收到以下错误：
Exception in thread "main" while scanning a directive
in 'reader', line 1, column 1:
%YAML:1.0
^
expected alphabetic or numeric character, but found :(58)
in 'reader', line 1, column 6:
%YAML:1.0
^
at org.yaml.snakeyaml.scanner.ScannerImpl.scanDirectiveName(ScannerImpl.java:1269)
at org.yaml.snakeyaml.scanner.ScannerImpl.scanDirective(ScannerImpl.java:1221)
at org.yaml.snakeyaml.scanner.ScannerImpl.fetchDirective(ScannerImpl.java:614)
at org.yaml.snakeyaml.scanner.ScannerImpl.fetchMoreTokens(ScannerImpl.java:306)
at org.yaml.snakeyaml.scanner.ScannerImpl.checkToken(ScannerImpl.java:226)
at org.yaml.snakeyaml.parser.ParserImpl$ParseImplicitDocumentStart.produce(ParserImpl.java:195)
at org.yaml.snakeyaml.parser.ParserImpl.peekEvent(ParserImpl.java:158)
at org.yaml.snakeyaml.parser.ParserImpl.checkEvent(ParserImpl.java:143)
at org.yaml.snakeyaml.composer.Composer.getSingleNode(Composer.java:104)
at org.yaml.snakeyaml.constructor.BaseConstructor.getSingleData(BaseConstructor.java:120)
at org.yaml.snakeyaml.Yaml.loadFromReader(Yaml.java:481)
at org.yaml.snakeyaml.Yaml.load(Yaml.java:412)
at projectCV.main(projectCV.java:33)
Java Result: 1
EDIT1：我注意到我的问题代表assertEquals，这是类断言junit库的一部分的函数。我无法找到一种方法将库正确导入到我的类路径中。我正在尝试两件事，下载.jar文件和ADD / Jar文件夹，从项目属性 - > libraries-> compile tests-> add library - > Junit 4.10。但我仍有问题。
I ve noticed that my problems stands for assertEquals which is a function of the class assert part of junit library. I cant find a way to import properly the library to my classpath. I am trying two things, download .jar file and ADD/Jar folder and from project properties->libraries->compile tests-> add library -> Junit 4.10. But I am still having issues.
EDIT2：我将YAML 1.0更改为YAML 1.1，但没有任何变化。我仍在尝试找到一种合适的方法来读取yml文件。
I change the YAML 1.0 to YAML 1.1, but nothing changes. I am still trying to find a suitable way to read the yml file.
final String fileName = "train.yml";
opencvmatrix mat = new opencvmatrix();
Yaml yaml = new Yaml();
try {
InputStream ios = new FileInputStream(new File(fileName));
// Parse the YAML file and return the output as a series of Maps and Lists
Map<String,Object> result = (Map<String,Object>)yaml.load(ios);
System.out.println(result.toString());
Collection<Object> file = result.values();
} catch (Exception e) {
e.printStackTrace();
}
}
当我试图运行此代码时，我收到：
WHen I am trying to run this code I am receiving:
Exception in thread "main" Can't construct a java object for tag:yaml.org,2002:opencv-
matrix; exception=Class not found: opencv-matrix
in 'reader', line 3, column 7:
mean: !!opencv-matrix
^
EDIT3：我创建了一个类opencvmatrix（类似于.yml属性的名称），其属性为rows，cols，dt，ArrayList数据。 .yml文件类似于：
I ve created a class opencvmatrix (like the name of .yml properties), with the properties rows, cols, dt, ArrayList data. The .yml file is like:
num_components: 19
num_components: 19
mean: !!opencvmatrix
rows: 1
cols: 3600
dt: d
data: [ 9.6842105263157890e+01, 1.0257894736842104e+02,
1.0557894736842104e+02, 1.0794736842105263e+02,
1.1752631578947367e+02, 1.1631578947368421e+02,
1.1084210526315789e+02, 1.0373684210526315e+02,
1.0052631578947368e+02, 9.5263157894736835e+01,
9.0421052631578945e+01, 8.5631578947368411e+01,
7.8684210526315780e+01, 7.2105263157894740e+01,
6.9315789473684205e+01, 6.9105263157894740e+01,
7.1052631578947370e+01, 7.9631578947368411e+01,
9.0894736842105260e+01, 1.0121052631578947e+02,
....]
projections:
- !!opencvmatrix
rows: 1
cols: 19
dt: d
data: [ 1.6852352677811423e+03, -1.0112905042030820e+03,
-1.3152188243875064e+03, 4.8298990155435700e+02,
9.1980535900698968e+01, 6.5624763621018792e+02,
-1.2380244625181117e+03, -1.8800931631152707e+02,
-4.1473232893431384e+02, 5.7197035514178856e+02,
4.9990276749703435e+02, 4.9062987890888604e+02,
6.1928710580829818e+02, -1.2842392693864540e+03,
2.4907719466932619e+01, 8.0299588479341844e+02,
1.1621501008120421e+02, 1.0410492864645674e+02,
8.5302163830384785e+01 ]
- !!opencvmatrix
rows: 1
cols: 19
dt: d
data: [ -1.0313663745467784e+03, 1.9900404646205566e+03,
-1.2844533156050284e+02, -4.3700867528097513e+02,
6.6145551346834259e+02, -2.0562483671734990e+03,
-1.9643774942432364e+02, 4.9329679854416281e+02,
-2.0003326324501427e+02, 1.0737995038485865e+03,
5.4161214984553695e+01, 4.7932826490658994e+02,
8.6307152262273064e+02, 6.7413046532276610e+02,
6.3835284527337114e+02, 4.1663169960066972e+02,
3.5883912817427905e+01, -1.2935687563770381e+02,
-1.6471877227400194e+03 ]
...
labels: !!opencvmatrix
rows: 1
cols: 19
dt: i
data: [ 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3 ]
现在没有更改主代码我收到以下错误：
Now without changing the main code I am receiving the following error:
Can't construct a java object for tag:yaml.org,2002:opencvmatrix; exception=No single
argument constructor found for class opencvmatrix
in 'reader', line 1, column 7:
mean: !!opencvmatrix
^
推荐答案
我终于尝试了上面的代码：
I am finally trying the above code:
public static void main(String[] args) {
// The path of your YAML file.
final String fileName = "test.yml";
ArrayList<String> key = new ArrayList<String>();
ArrayList<String> value = new ArrayList<String>();
Yaml yaml = new Yaml();
try {
InputStream ios = new FileInputStream(new File(fileName));
// Parse the YAML file and return the output as a series of Maps and Lists
Map< String, Object> result = (Map< String, Object>) yaml.load(ios);
for (Object name : result.keySet()) {
key.add(name.toString());
value.add(result.get(name).toString());
}
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(key + " " + value); }
实际上读取.yml文件并返回文件的密钥和对应值。我的问题是值包含其他对象，由于yaml文件的顺序，这些对象包含其他映射。 Println在终端显示以上内容：
Which actually reads .yml file and returns the keys and the correspondant values of the file. My problem is that value contains other objects which with their turn contains others Maps due to the order of the yaml file. Println shows the above in terminal:
[mean, eigenvalues, eigenvectors, projections, labels] [opencvmatrix@16e70aa, opencvmatrix@1a6e106, opencvmatrix@ff8927, [opencvmatrix@859445, opencvmatrix@1c94782, opencvmatrix@175e958, opencvmatrix@2acdad, opencvmatrix@254927, opencvmatrix@1e5c67f, opencvmatrix@4ace42, opencvmatrix@12b710e, opencvmatrix@10b6d81, opencvmatrix@142691b, opencvmatrix@102985e, opencvmatrix@16168c4, opencvmatrix@25417f, opencvmatrix@1ef0642, opencvmatrix@183d912, opencvmatrix@1204e58, opencvmatrix@1f78fae, opencvmatrix@1f9fe08, opencvmatrix@194ddfb], opencvmatrix@7996db]
如何访问返回的嵌套对象???
How can I have access to the returned nested objects???
Edit2：实际上我必须将返回的对象从.yaml文件转换为我必须定义的新类。所以我的代码用于读取.yml元素（面部识别器训练元素）：
Actually I had to cast the returned objects from the .yaml file to a new class that I have to define. So my code for reading .yml elements (face recognizer trained elements):
ArrayList<String> key = new ArrayList<String>();
ArrayList<String> value = new ArrayList<String>();
ArrayList<Object> obj = new ArrayList<Object>();
ArrayList<Object> objected = new ArrayList<Object>();
opencvmatrix mean = new opencvmatrix();
opencvmatrix eigenValues = new opencvmatrix();
opencvmatrix eigenVectors = new opencvmatrix();
ArrayList<Object> opencvmatrix4 = new ArrayList<Object>();
opencvmatrix labels = new opencvmatrix();
opencvmatrix opencvmatrix6 = new opencvmatrix();
ArrayList<ArrayList<Double>> projections = new ArrayList<ArrayList<Double>>();
Yaml yaml = new Yaml();
try {
InputStream ios = new FileInputStream(new File(fileName));
// Parse the YAML file and return the output as a series of Maps and Lists
Map< String, Object> result = (Map< String, Object>) yaml.load(ios);
for (Object name : result.keySet()) {
key.add(name.toString());
obj.add(result.get(name));
}
} catch (Exception e) {
e.printStackTrace();
}
File file = new File("eigenvalues.txt");
// creates the file
file.createNewFile();
// creates a FileWriter Object
FileWriter writer = new FileWriter(file);
// Writes the content to the file
mean = (opencvmatrix) (obj.get(0));
eigenValues = (opencvmatrix) (obj.get(1));
eigenVectors = (opencvmatrix) (obj.get(2));
opencvmatrix4 = (ArrayList<Object>) obj.get(3);
for(int i=0; i<opencvmatrix4.size(); i++){
opencvmatrix6 = (opencvmatrix)opencvmatrix4.get(i);
projections.add(opencvmatrix6.data);
}
//System.out.println(projections.get(0).size());
labels = (opencvmatrix) (obj.get(4));
//System.out.println(obj3.data.size());
writer.write(eigenVectors.data.get(0) + " ");
temp.add(eigenVectors.data.get(0));
eigenMatrix.add(temp);
for (int i = 1; i < eigenVectors.data.size(); i++) {
if (i % 3600 == 0) {
writer.write("\n");
eigenMatrix.add(temp);
temp.clear();
}
writer.write(eigenVectors.data.get(i) + " ");
temp.add(eigenVectors.data.get(i));
}
writer.flush();
writer.close();
这篇关于使用snakeyaml（import junit library）将.yml文件加载到哈希映射的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
