java中实现map与对象相互转换的几种实现

最近，研究map与java对象之间的相互转换，总结了5种方法：

第一种：使用org.apache.commo本文来源[email protected]搞@^&代*@码2网ns.beanutils转换

用到的主要jar包：commons-beanutils-1.9.3.jar

//map转java对象
public static Object mapToObject(Map<String, Object> map, Class<?> beanClass)
  throws Exception {
 if (map == null) {
  return null;
 }
 Object obj = beanClass.newInstance();
 BeanUtils.populate(obj, map);
 return obj;
 }
 
//java对象转map
public static Map<?, ?> objectToMap(Object obj) {
 if (obj == null)
  return null;
 return new BeanMap(obj);
 }

在使用该方法进行java对象转map时，可能会发生以下错误：

Exception in thread “main” java.lang.NoClassDefFoundError: org/apache/commons/collections/Transformer
 at java.lang.ClassLoader.defineClass1(Native Method)
 at java.lang.ClassLoader.defineClass(ClassLoader.java:621)
 at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
 at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
 at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
 at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 at org.apache.commons.beanutils.BeanMap.createTypeTransformers(BeanMap.java:132)
 at org.apache.commons.beanutils.BeanMap.<clinit>(BeanMap.java:68)
 at com.example2.pojo.PojoToMap.objectToMap(PojoToMap.java:23)
 at com.example2.pojo.PojoToMap.main(PojoToMap.java:16)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.collections.Transformer
 at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
 at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 … 16 more

解决方法见本人的另一篇文章：https://www.gaodaima.com/article/190471.htm

第二种：使用Introspector转换

//map转java对象
public static Object mapToObject(Map<String, Object> map, Class<?> beanClass) throws Exception {
    if (map == null)
      return null;
    Object obj = beanClass.newInstance();
    BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
    PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
    for (PropertyDescriptor property : propertyDescriptors) {
      Method setter = property.getWriteMethod();
      if (setter != null) {
        setter.invoke(obj, map.get(property.getName()));
      }
    }
    return obj;
  }
 
//java对象转map
public static Map<String, Object> objectToMap(Object obj) throws Exception {
 if (obj == null) {
 return null;
 }
 Map<String, Object> map = new HashMap<String, Object>();
 BeanInfo beanInfo = Introspector.getBeanInfo(obj.getClass());
 PropertyDescriptor[] propertyDescriptors = beanInfo
  .getPropertyDescriptors();
 for (PropertyDescriptor property : propertyDescriptors) {
 String key = property.getName();
 if (key.compareToIgnoreCase("class") == 0) {
  continue;
 }
 Method getter = property.getReadMethod();
 Object value = getter != null ? getter.invoke(obj) : null;
 map.put(key, value);
 }
 return map;
}

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