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

public class Test {

  /**
   * 去掉bean中所有屬性為字符串的前后空格
   *
   * @param bean
   * @throws Exception
   */
  public static void beanAttributeValueTrim(Object bean) throws Exception {
    if (bean != null) {
      //獲取所有的字段包括public,private,protected,private
      Field[] fields = bean.getClass().getDeclaredFields();
      for (int i = 0; i < fields.length; i++) {
        Field f = fields[i];
        if (f.getType().getName().equals("java.lang.String")) {
          String key = f.getName();
          //獲取字段名
          Object value = getFieldValue(bean, key);

          if (value == null)
            continue;

          setFieldValue(bean, key, value.toString().trim());
        }
      }
    }
  }

  /**
   * 利用反射通過get方法獲取bean中字段fieldName的值
   *
   * @param bean
   * @param fieldName
   * @return
   * @throws Exception
   */
  private static Object getFieldValue(Object bean, String fieldName)
      throws Exception {
    StringBuffer result = new StringBuffer();
    String methodName = result.append("get")
        .append(fieldName.substring(0, 1).toUpperCase())
        .append(fieldName.substring(1)).toString();

    Object rObject = null;
    Method method = null;

    @SuppressWarnings("rawtypes")
    Class[] classArr = new Class[0];
    method = bean.getClass().getMethod(methodName, classArr);
    rObject = method.invoke(bean, new Object[0]);

    return rObject;
  }

  /**
   * 利用發射調用bean.set方法將value設置到字段
   *
   * @param bean
   * @param fieldName
   * @param value
   * @throws Exception
   */
  private static void setFieldValue(Object bean, String fieldName, Object value)
      throws Exception {
    StringBuffer result = new StringBuffer();
    String methodName = result.append("set")
        .append(fieldName.substring(0, 1).toUpperCase())
        .append(fieldName.substring(1)).toString();

    //利用反射調用bean.set方法將value設置到字段
    @SuppressWarnings("rawtypes")
    Class[] classArr = new Class[1];
    classArr[0] = "java.lang.String".getClass();
    Method method = bean.getClass().getMethod(methodName, classArr);
    method.invoke(bean, value);
  }

}