Struts2 compatible date type converter (yyyy-MM-dd or yyyy/MM/dd or yyyyMMdd)

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Reprinted source: Power Node-SSH from entry to master

package converter;

import java.util.Date;
import java.text.SimpleDateFormat;

import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.conversion.TypeConversionException;
import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Pattern;

public class MyDateConverter extends DefaultTypeConverter {

	@SuppressWarnings("unchecked")
	@Override // value：目标转换值；toType：目标转换类型
	public Object convertValue(Object value, Class toType) {
		SimpleDateFormat sdf = null; // 创建空的简单日期格式
		try {
			if (Date.class == toType) { // 前端页面到服务器端的数据转换
				String dateStr = ((String[]) value)[0];
				sdf = getSimpleDateFormat(dateStr); // 调用自定义简单日期格式转换函数
				ActionContext.getContext().getSession().put("sdf", sdf); // 将返回的日期格式存入Session会话
				return sdf.parse(dateStr); // 返回日期格式的解析结果
			} else if (String.class == toType) { // 服务器端到前端页面的数据转换
				Date date = (Date)value;
				// 从Session会话中获取存储的日期格式
				sdf = (SimpleDateFormat)ActionContext.getContext().getSession().get("sdf");
				return sdf.format(date);
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return super.convertValue(value, toType); // 返回最终的日期格式转换结果
	}

	/**
	 * 根据传入的参数生成指定的日期格式
	 * @param source
	 * @return
	 */
	private SimpleDateFormat getSimpleDateFormat(String source) {
		SimpleDateFormat sdf = null;
		if (Pattern.matches("^\\d{4}-\\d{2}-\\d{2}$", source)) {
			sdf = new SimpleDateFormat("yyyy-MM-dd");
		} else if (Pattern.matches("^\\d{4}/\\d{2}/\\d{2}$", source)) {
			sdf = new SimpleDateFormat("yyyy/MM/dd");
		} else if (Pattern.matches("^\\d{4}\\d{2}\\d{2}$", source)) {
			sdf = new SimpleDateFormat("yyyyMMdd");
		} else {
			throw new TypeConversionException(); 
		}
		return sdf;
	}
	
}

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