requestloader.java

Jodd是一个开源的公用Java基础类库

package jodd.bean.loaders;

import java.util.Enumeration;

import javax.servlet.http.HttpServletRequest;

import jodd.bean.BeanUtil;

/**
 * Populates java bean from HttpServletRequest objects.
 * <p>
 *
 * Names of requests parameters represents the names of bean properties.
 * Values of requests parameters represents values of bean properties.
 * <p>
 *
 * By java servlet specifications, parameter values are always String arrays
 * (String[]).  That is how they are sent to BeanUtil.setProperty(),
 * except in case when this array contains just one String element. In that
 * case it is sent as a single String.
 * <p>
 *
 * BeanUtil.setProperty() will populate correctly target property.
 */
public class RequestLoader implements jodd.bean.Loader {

	public void load(Object bean, Object request) {
		if (request instanceof HttpServletRequest) {
			Enumeration paramNames = ((HttpServletRequest)request).getParameterNames();
			while (paramNames.hasMoreElements()) {
				String paramName = (String) paramNames.nextElement();
				String[] paramValues = ((HttpServletRequest)request).getParameterValues(paramName);
				if (paramValues == null) {
					continue;
				}
				if (paramValues.length == 0) {
					continue;
				}
				if (paramValues.length == 1) {
					// send just String
					BeanUtil.setProperty(bean, paramName, paramValues[0]);
				} else {
					// send String array
					BeanUtil.setProperty(bean, paramName, paramValues);
				}
			}
		}
		return;
	}
}