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###Struts2更改浏览器默认的语言环境，导致“yyyy-MM-dd”格式日期无法转换问题解决。

##DateConverter.java
package com.tbc.app.rfs.Interceptor;


import com.opensymphony.xwork2.conversion.impl.DefaultTypeConverter;
import org.apache.commons.lang.time.DateUtils;
import org.apache.commons.lang3.StringUtils;

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

/**
 * @author Zelipe
 */
public class DateConverter extends DefaultTypeConverter {


	private static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";

	private static final String DATE_PATTERN = "yyyy-MM-dd";

	private static final String MONTH_PATTERN = "yyyy-MM";

	/**
	 * Convert value between types
	 */
	@SuppressWarnings("unchecked")
	public Object convertValue(Map ognlContext, Object value, Class toType) {
		Object result = null;
		if (toType == Date.class) {
			result = doConvertToDate(value);
		} else if (toType == String.class) {
			result = doConvertToString(value);
		}
		return result;
	}

	/**
	 * Convert String to Date
	 *
	 * @param value
	 * @return
	 */
	private Date doConvertToDate(Object value) {
		Date result = null;

		if (value instanceof String) {
			try {
				result = DateUtils.parseDate((String) value, new String[]{DATE_PATTERN, DATETIME_PATTERN, MONTH_PATTERN});
			} catch (ParseException e) {
				e.printStackTrace();
			}

			// all patterns failed, try a milliseconds constructor
			if (result == null && StringUtils.isNotEmpty((String) value)) {

				try {
					result = new Date(new Long((String) value).longValue());
				} catch (Exception e) {
					e.printStackTrace();
				}

			}

		} else if (value instanceof Object[]) {
			// let's try to convert the first element only
			Object[] array = (Object[]) value;

			if ((array != null) && (array.length >= 1)) {
				value = array[0];
				result = doConvertToDate(value);
			}

		} else if (Date.class.isAssignableFrom(value.getClass())) {
			result = (Date) value;
		}
		return result;
	}

	/**
	 * Convert Date to String
	 *
	 * @param value
	 * @return
	 */
	private String doConvertToString(Object value) {
		SimpleDateFormat simpleDateFormat = new SimpleDateFormat(DATETIME_PATTERN);
		String result = null;
		if (value instanceof Date) {
			result = simpleDateFormat.format(value);
		}
		return result;
	}

}


##2.classpath下建立xwork-conversion.properties文件
java.util.Date=com.tbc.app.rfs.Interceptor.DateConverter



###参考http://polaris.blog.51cto.com/1146394/315403/