Question

我正在面对这个Java.lang.nosuchFeildExecption 在执行代码时谁能帮助我，如何解决这个问题？提前致谢我正在面对这个Java.lang.nosuchFeildExecption 在执行代码时..

    public class Validation {
    public void readJSON() throws Exception {
            File file = new File("myJSONFile.txt");
            String content = FileUtils.readFileToString(file, "utf-8");

            // Convert JSON string to JSONObject
            JSONObject tomJsonObject = new JSONObject(content);
            System.out.println(tomJsonObject);
            System.out.println(tomJsonObject.getString("age"));
            validateByType(tomJsonObject, "age", null);
        }

        public void validateByType(JSONObject jsonString, String pathString, String typeString)
                throws JSONException, ClassNotFoundException, NoSuchFieldException, SecurityException {
            String jsonField = jsonString.getString(pathString);
            // pathString = "age";
            // typeString ="number";

            Class<?> c = Class.forName("Validation");
            Field f = c.getField(jsonField);
            System.out.format("Type: %s%n", f.getType());
            System.out.format("GenericType: %s%n", f.getGenericType());

        }

        public static void main(String[] args) {
            // TODO Auto-generated method stub
            System.out.println("Test");
            Validation v = new Validation();
            try {
                v.readJSON();

            } catch (Exception e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }

    }

Answer 1

给定路径例如：File file = new File（“ D：\ myJSONFile.txt”）; 或根据您的要求给出路径在Windows机器字符串absoluteFilePath = fileSeparator +“用户” + fileSeparator +“ roopesh” + fileSeparator +“ myJSONFile.txt”; 文件文件=新文件（absoluteFilePath）;

Answer 2

可以将文件添加（假设可以）到 src / main / resources 文件夹中，然后使用java.nio包读取文件：

 Path path = Path.get(getClass().getClassLoader().getResource("myJSONFile.txt").toURI());
 byte[] fileBytes = Files.readAllBytes(path);
 String theString = new String(fileBytes, "UTF-8");

现在要阅读课程和领域：

 Class<?> c = Class.forName("<give class name with package>");

 //whatever field is attempted to be read
 Field f = c.getDeclaredField("fieldName");

该字段应该出现在班级中。

示例：

 private String fieldName;

我在执行时面临Java.lang.nosuchFeildExecption

2 个答案: