如何快速熟悉一个项目

import com.google.common.reflect.TypeToken;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.reflect.FieldUtils;
import org.apache.commons.lang3.reflect.MethodUtils;
import org.springframework.beans.BeansException;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationContextAware;
import org.springframework.util.CollectionUtils;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.*;

@RestController
public class EchoController implements ApplicationContextAware {

private static final Gson GSON = new GsonBuilder().disableHtmlEscaping().create();
private ApplicationContext applicationContext;

@Override
public void setApplicationContext(ApplicationContext applicationContext) throws BeansException {
    this.applicationContext = applicationContext;
}

//applicationContext中的对象反射调用，data为请求参数(LinkedHashMap的json格式，其中key为类型的全限定名)
@RequestMapping(method = RequestMethod.POST, value = "/invoke")
public String invoke(String obj, String methodName, @RequestParam(value = "data", required = false) String data) {
try {
Object object = getObj(applicationContext, obj);
LinkedHashMap linkedHashMap = StringUtils.isBlank(data) ?
new LinkedHashMap<>() : GSON.fromJson(data, new TypeToken>() {
}.getType());
Object[] args = linkedMap2args(linkedHashMap);
try {
Object invoke = MethodUtils.invokeMethod(object, methodName, args);
return GSON.toJson(invoke);
} catch (Exception e) {
Method[] declaredMethods = object.getClass().getDeclaredMethods();
for (Method m : declaredMethods) {
if (m.getName().equals(methodName)) {
m.setAccessible(true);
Object invoke = m.invoke(object, args);
return GSON.toJson(invoke);
}
}
for (Class parentClass = object.getClass().getSuperclass(); parentClass != null; parentClass = parentClass.getSuperclass()) {
Method[] parentMethods = parentClass.getDeclaredMethods();
for (Method m : parentMethods) {
if (m.getName().equals(methodName)) {
m.setAccessible(true);
Object invoke = m.invoke(object, args);
return GSON.toJson(invoke);
}
}
}
throw new RuntimeException("未找到方法：" + methodName);
}
} catch (Exception e) {
return e.getMessage();
}
}

private Object[] linkedMap2args(LinkedHashMap linkedHashMap) {
    if (CollectionUtils.isEmpty(linkedHashMap)) {
        return null;
    } else {
        List