今天做了一個java物件轉Map的例子，執行的時候報錯了，如下：

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

先貼上本例的主要程式碼吧：

package com.example2.pojo;
 
import java.util.Map;
import java.util.Set;
 
import org.apache.commons.beanutils.BeanMap;
 
public class PojoToMap {
 
 /**
 * @param args
 */
 public static void main(String[] args) {
 Employee employee = new Employee();
 employee.setName("張三");
 employee.setAge(30);
 Map map;
 try {
  map = objectToMap(employee);
  Set<Map.Entry<String,Object>> set = map.entrySet();
  for (Map.Entry<String,Object> entry : set) {
  System.out.println(entry.getKey() + " : " + entry.getValue());
  }
 } catch (Exception e) {
  e.printStackTrace();
 }
 }
 
 public static Map<?,?> objectToMap(Object obj) {
 if (obj == null)
  return null;
 return new BeanMap(obj);
 }
}

Employee類：

package com.example2.pojo;
 
public class Employee {
 
 private String name;
 private Integer age;
 public String getName() {
 return name;
 }
 public void setName(String name) {
 this.name = name;
 }
 public Integer getAge() {
 return age;
 }
 public void setAge(Integer age) {
 this.age = age;
 }
}

從報錯資訊上看，是缺少了org.apache.commons.collections.Transformer類，網上下載了commons-collections-3.2.1.jar包，引入後，重新執行，成功。

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