abstracturlbasedview.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.web.servlet.view;

/**
 * Abstract base class for URL-based views. Provides a consistent way of
 * holding the URL that a View wraps, in the form of a "url" bean property.
 * @author Juergen Hoeller
 * @since 13.12.2003
 */
public abstract class AbstractUrlBasedView extends AbstractView {

	private String url;

	/**
	 * Set the URL of the resource that this view wraps.
	 * The URL must be appropriate for the concrete View implementation.
	 */
	public void setUrl(String url) {
		this.url = url;
	}

	/**
	 * Return the URL of the resource that this view wraps.
	 */
	public String getUrl() {
		return url;
	}

	/**
	 * Overridden lifecycle method to check that 'url' property is set.
	 */
	protected void initApplicationContext() {
		if (getUrl() == null) {
			throw new IllegalArgumentException("url is required");
		}
	}

	public String toString() {
		StringBuffer sb = new StringBuffer(super.toString());
		sb.append("; URL [").append(getUrl()).append("]");
		return sb.toString();
	}

}