JavaBean 和 Map 之间互相转换

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;

/**
 * JavaBean and map converter.
 * 
 * 
 */
public final class BeanMapUtils { 
  
  /**
   * Converts a map to a JavaBean.
   * 
   * @param type type to convert
   * @param map map to convert
   * @return JavaBean converted
   * @throws IntrospectionException failed to get class fields
   * @throws IllegalAccessException failed to instant JavaBean
   * @throws InstantiationException failed to instant JavaBean
   * @throws InvocationTargetException failed to call setters
   */
  public static final Object toBean(Class<?> type, Map<String, ? extends Object> map) 
      throws IntrospectionException, IllegalAccessException,  InstantiationException, InvocationTargetException {
    BeanInfo beanInfo = Introspector.getBeanInfo(type);
    Object obj = type.newInstance();
    PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
    for (int i = 0; i< propertyDescriptors.length; i++) {
      PropertyDescriptor descriptor = propertyDescriptors[i];
      String propertyName = descriptor.getName();
      if (map.containsKey(propertyName)) {
        Object value = map.get(propertyName);
        Object[] args = new Object[1];
        args[0] = value;
        descriptor.getWriteMethod().invoke(obj, args);
      }
    }
    return obj;
  }
  
  /**
   * Converts a JavaBean to a map
   * 
   * @param bean JavaBean to convert
   * @return map converted
   * @throws IntrospectionException failed to get class fields
   * @throws IllegalAccessException failed to instant JavaBean
   * @throws InvocationTargetException failed to call setters
   */
  public static final Map<String, Object> toMap(Object bean)
      throws IntrospectionException, IllegalAccessException, InvocationTargetException {
    Map<String, Object> returnMap = new HashMap<String, Object>();
    BeanInfo beanInfo = Introspector.getBeanInfo(bean.getClass());
    PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
    for (int i = 0; i< propertyDescriptors.length; i++) {
      PropertyDescriptor descriptor = propertyDescriptors[i];
      String propertyName = descriptor.getName();
      if (!propertyName.equals("class")) {
        Method readMethod = descriptor.getReadMethod();
        Object result = readMethod.invoke(bean, new Object[0]);
        if (result != null) {
          returnMap.put(propertyName, result);
        } else {
          returnMap.put(propertyName, "");
        }
      }
    }
    return returnMap;
  }

<span style="white-space:pre">  public</span> static final Map<String, String> toStringMap(Object bean) {


<span style="white-space:pre">    if (bean == null) {return null;
<span style="white-space:pre">  </span><span style="white-space:pre"> </span></span>}

<span style="white-space:pre">    Map<String, String> returnMap = new HashMap<String, String>();</span>
<span style="white-space:pre">    BeanInfo beanInfo;
<span style="white-space:pre">    </span>try {</span>

}