blocks|key|704089|text|+//+Get+the+Class+object+associated+with+this+class.
++++MyClass+myClass=+new+MyClass+();
++++Class+objClass=+myClass.getClass();

++++//+Get+the+public+methods+associated+with+this+class.
++++Method[]+methods+=+objClass.getMethods();
++++for+(Method+method:methods)
++++{
++++++++System.out.println("Public+method+found:+"+%2B++method.toString());
++++}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|704090|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code> // Get the Class object associated with this class.
 MyClass myClass= new MyClass ();
 Class objClass= myClass.getClass();

 // Get the public methods associated with this class.
 Method[] methods = objClass.getMethods();
 for (Method method:methods)
 {
 System.out.println("Public method found: " + method.toString());
 }
</code></pre>

blocks|key|704122|text|为此，您可以使用Reflections框架|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|704123|import+org.reflections.ReflectionUtils.*;
Set<Method>+getters+=+ReflectionUtils.getAllMethods(someClass,
++++++ReflectionUtils.withModifier(Modifier.PUBLIC),+ReflectionUtils.withPrefix("get"));|code-block|syntax|javascript|704124|entityMap|0|LINK|mutability|MUTABLE|url|https://code.google.com/p/reflections/^0|8|B|0|0|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@$A|R|B|S|1|T]]|C|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]]]

You can use <a href="https://code.google.com/p/reflections/">Reflections</a> framework for this

<pre><code>import org.reflections.ReflectionUtils.*;
Set&lt;Method&gt; getters = ReflectionUtils.getAllMethods(someClass,
 ReflectionUtils.withModifier(Modifier.PUBLIC), ReflectionUtils.withPrefix("get"));
</code></pre>

blocks|key|488537|text|Spring为Bean自省提供了一个简单的BeanUtil+method：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|488538|PropertyDescriptor+pd+=+BeanUtils.getPropertyDescriptor(clazz,+property);
Method+getter+=+pd.getReadMethod();|code-block|syntax|javascript|488539|entityMap|0|LINK|mutability|MUTABLE|url|http://spring.ip/|1|http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/beans/BeanUtils.html#getPropertyDescriptor-java.lang.Class-java.lang.String-^0|0|6|0|L|F|1|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]|$A|W|B|X|1|Y]]|C|$]]|$1|D|3|E|5|F|7|Z|8|@]|9|@]|C|$G|H]]|$1|I|3|-4|5|6|7|10|8|@]|9|@]|C|$]]]|J|$K|$5|L|M|N|C|$O|P]]|Q|$5|L|M|N|C|$O|R]]]]

<a href="http://spring.ip" rel="noreferrer">Spring</a> offers an easy <a href="http://docs.spring.io/spring/docs/current/javadoc-api/org/springframework/beans/BeanUtils.html#getPropertyDescriptor-java.lang.Class-java.lang.String-" rel="noreferrer">BeanUtil method</a> for Bean introspection:

<pre><code>PropertyDescriptor pd = BeanUtils.getPropertyDescriptor(clazz, property);
Method getter = pd.getReadMethod();
</code></pre>

blocks|key|704234|text|这段代码测试正常。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|704235|private+void+callAllGetterMethodsInTestModel(TestModel+testModelObject)+{
++++++++try+{
++++++++++++Class+testModelClass+=+Class.forName("com.example.testreflectionapi.TestModel");
++++++++++++Method[]+methods+=+testModelClass.getDeclaredMethods();
++++++++++++ArrayList<String>+getterResults+=+new+ArrayList<>();
++++++++++++for+(Method+method+:
++++++++++++++++++++methods)+{
++++++++++++++++if+(method.getName().startsWith("get")){
++++++++++++++++++++getterResults.add((String)+method.invoke(testModelObject));
++++++++++++++++}
++++++++++++}
++++++++++++Log.d("sayanReflextion",+"==>:+"%2BgetterResults.toString());
++++++++}+catch+(ClassNotFoundException+%7C+IllegalAccessException+%7C+InvocationTargetException+e)+{
++++++++++++e.printStackTrace();
++++++++}
++++}|code-block|syntax|javascript|704236|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

This code is tested OK.

<pre><code>private void callAllGetterMethodsInTestModel(TestModel testModelObject) {
 try {
 Class testModelClass = Class.forName("com.example.testreflectionapi.TestModel");
 Method[] methods = testModelClass.getDeclaredMethods();
 ArrayList&lt;String&gt; getterResults = new ArrayList&lt;&gt;();
 for (Method method :
 methods) {
 if (method.getName().startsWith("get")){
 getterResults.add((String) method.invoke(testModelObject));
 }
 }
 Log.d("sayanReflextion", "==&gt;: "+getterResults.toString());
 } catch (ClassNotFoundException | IllegalAccessException | InvocationTargetException e) {
 e.printStackTrace();
 }
 }
</code></pre>

blocks|key|704269|text|为什么不使用简单的Java呢？|type|unstyled|depth|inlineStyleRanges|entityRanges|data|704270|public+static+Map<String,+Object>+beanProperties(final+Object+bean)+{
++++final+Map<String,+Object>+result+=+new+HashMap<String,+Object>();

++++try+{
++++++++final+PropertyDescriptor[]+propertyDescriptors+=+Introspector.getBeanInfo(bean.getClass(),+Object.class).getPropertyDescriptors();
++++++++for+(PropertyDescriptor+propertyDescriptor+:+propertyDescriptors)+{
++++++++++++final+Method+readMethod+=+propertyDescriptor.getReadMethod();
++++++++++++if+(readMethod+!=+null)+{
++++++++++++++++result.put(propertyDescriptor.getName(),+readMethod.invoke(bean,+(Object[])+null));
++++++++++++}
++++++++}
++++}+catch+(Exception+ex)+{
++++++++//+ignore
++++}

++++return+result;
}|code-block|syntax|javascript|704271|..。|704272|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Why not use simple Java?
...

<pre><code>public static Map&lt;String, Object&gt; beanProperties(final Object bean) {
 final Map&lt;String, Object&gt; result = new HashMap&lt;String, Object&gt;();

 try {
 final PropertyDescriptor[] propertyDescriptors = Introspector.getBeanInfo(bean.getClass(), Object.class).getPropertyDescriptors();
 for (PropertyDescriptor propertyDescriptor : propertyDescriptors) {
 final Method readMethod = propertyDescriptor.getReadMethod();
 if (readMethod != null) {
 result.put(propertyDescriptor.getName(), readMethod.invoke(bean, (Object[]) null));
 }
 }
 } catch (Exception ex) {
 // ignore
 }

 return result;
}
</code></pre>

...

blocks|key|704294|text|public+static+void+retrieveAndExecuteBeanGetterMethods(Object+bean)+throws+IntrospectionException+{
++++List<PropertyDescriptor>+beanGettersList+=+Arrays.asList(
++++++++++++Introspector.getBeanInfo(bean.getClass(),+Object.class)
++++++++++++++++++++.getPropertyDescriptors());

++++beanGettersList.stream()
++++++++++++.filter(pd+->+Objects.nonNull(pd.getReadMethod()))
++++++++++++.collect(Collectors.toMap(PropertyDescriptor::getName,
++++++++++++++++++++pd+->+{
++++++++++++++++++++++++try+{
++++++++++++++++++++++++++++return+pd.getReadMethod().invoke(bean);
++++++++++++++++++++++++}+catch+(Exception+e)+{
++++++++++++++++++++++++++++return+null;
++++++++++++++++++++++++}
++++++++++++++++++++}));
}|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|704295|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>public static void retrieveAndExecuteBeanGetterMethods(Object bean) throws IntrospectionException {
 List&lt;PropertyDescriptor&gt; beanGettersList = Arrays.asList(
 Introspector.getBeanInfo(bean.getClass(), Object.class)
 .getPropertyDescriptors());

 beanGettersList.stream()
 .filter(pd -&gt; Objects.nonNull(pd.getReadMethod()))
 .collect(Collectors.toMap(PropertyDescriptor::getName,
 pd -&gt; {
 try {
 return pd.getReadMethod().invoke(bean);
 } catch (Exception e) {
 return null;
 }
 }));
}
</code></pre>

I write a java class which has many getters..now I want to get all getter methods and invoke them sometime..I know there are methods such as getMethods() or getMethod(String name, Class... parameterTypes) ,but i just want to get the getter indeed..., use regex? anyone can tell me ?Thanks!

Java Reflection: How can I get the all getter methods of a java class and invoke them

Java

我写了一个有许多getters..now的java类，我想获取所有的getter方法并在某个时候调用它们。我知道有一些方法，比如getMethods()或getMethod(String name，Class...parameterTypes)，但我真的只想得到getter ...，使用正则表达式？有人能告诉我吗?谢谢...

问Java反射:如何获取java类的所有getter方法并调用它们
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Java反射:如何获取java类的所有getter方法并调用它们EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问Java反射:如何获取java类的所有getter方法并调用它们
EN