如何在数据库中保存类方法？

Question

Is it possible to read all the methods of a java class and save their names in the database?

@Entity
public class Action {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;

    public Action() {
    }

    public String methodA() {
        return "methodA";
    }

    public String methodB() {
        return "methodB";
    }
}

Answer 1

Use Java reflection:

Method[] methods = Action.class.getDeclaredMethods();

for (int i = 0; i < methods.length; i++) {
     saveToDB(methods[i].toString());
}

Answer 2

you can use the java.lang.Class.getDeclaredMethods() method which returns an array of Method objects including public, protected, default (package) access, and private methods, but excludes inherited methods.

Action  cls = new Action ();
Class c = cls.getClass();
Method[] methods = c.getDeclaredMethods();
for(int i = 0; i < methods.length; i++) {
    System.out.println(methods[i].toString());
}

your output will be something like that:

public java.lang.String methodA()
public java.lang.String methodB()

if you want to store only the name of your methods, you can use the getName() method. so if you do this:

for(int i = 0; i < methods.length; i++) {
    System.out.println(methods[i].toString());
}

you get this output:

methodA
methodB

Answer 3

You can use javassist as well to get all methods at runtime. Even if you don't know about class structure.

ClassPool pool = ClassPool.getDefault();
CtClass cc = pool.get("class Name");
CtMethod[] methods=cc.getDeclaredMethods();
for(CtMethod method:methods){
 System.out.println(method.toString());
}