urleditor.java

一个关于Spring框架的示例应用程序,简单使用,可以参考.

/*
 * Copyright 2002-2004 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */ 

package org.springframework.beans.propertyeditors;

import java.beans.PropertyEditorSupport;
import java.io.IOException;
import java.net.URL;

import org.springframework.core.io.Resource;
import org.springframework.core.io.ResourceEditor;

/**
 * Editor for java.net.URL, to directly feed a URL property
 * instead of using a String property.
 * @author Juergen Hoeller
 * @since 15.12.2003
 * @see java.net.URL
 */
public class URLEditor extends PropertyEditorSupport {

	private final ResourceEditor resourceEditor;

	/**
	 * Create a new URLEditor,
	 * using the default ResourceEditor underneath.
	 */
	public URLEditor() {
		this.resourceEditor = new ResourceEditor();
	}

	/**
	 * Create a new URLEditor,
	 * using the given ResourceEditor underneath.
	 * @param resourceEditor the ResourceEditor to use
	 */
	public URLEditor(ResourceEditor resourceEditor) {
		this.resourceEditor = resourceEditor;
	}

	public void setAsText(String text) throws IllegalArgumentException {
		this.resourceEditor.setAsText(text);
		Resource resource = (Resource) this.resourceEditor.getValue();
		try {
			setValue(resource != null ? resource.getURL() : null);
		}
		catch (IOException ex) {
			throw new IllegalArgumentException(
					"Could not retrieve URL for " + resource + ": " + ex.getMessage());
		}
	}

	public String getAsText() {
		if (getValue() != null) {
			return ((URL) getValue()).toExternalForm();
		}
		else {
			return "";
		}
	}

}