异常信息国际化

JAVA代码

package com.ce.common.util;

import java.util.HashMap;
import java.util.Locale;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.springframework.context.MessageSourceResolvable;
import org.springframework.context.NoSuchMessageException;
import org.springframework.context.support.ResourceBundleMessageSource;

public class I18N {

	private static Map<String, I18N> i18nMap = new HashMap<String, I18N>();
	private String namespace = "default_i18n";
	private String[] basenames = new String[0];
	private ResourceBundleMessageSource resourceBundleMessageSource = null;

	public I18N() {
		i18nMap.put("default_i18n", this);
	}

	public static I18N getI18N(String namespace) {
		return i18nMap.get(namespace);
	}

	public String getNamespace() {
		return namespace;
	}

	public void setNamespace(String namespace) {
		this.namespace = namespace;
		if (i18nMap.containsKey(namespace)) {
			throw new IllegalArgumentException("duplicated namespace: "
					+ namespace);
		}
		i18nMap.put(namespace, this);
	}

	public String[] getBasenames() {
		return basenames;
	}

	public void setBasenames(String[] basenames) {
		this.basenames = basenames;
	}

	public ResourceBundleMessageSource getResourceBundleMessageSource() {
		if (resourceBundleMessageSource == null) {
			resourceBundleMessageSource = new ResourceBundleMessageSource();
			resourceBundleMessageSource.setBasenames(getBasenames());
		}
		return resourceBundleMessageSource;
	}

	public void setResourceBundleMessageSource(
			ResourceBundleMessageSource resourceBundleMessageSource) {
		this.resourceBundleMessageSource = resourceBundleMessageSource;
	}

	public String getMessage(String code, Object[] args, String defaultMessage,
			Locale locale) {
		String message = code;
		try {
			message = getResourceBundleMessageSource().getMessage(code,
					praseArgs(args, locale, this), defaultMessage, locale);
		} catch (Exception e) {
		}
		return message;
	}

	public String getMessage(String code, Locale locale)
			throws NoSuchMessageException {
		String message = code;
		try {
			message = getResourceBundleMessageSource().getMessage(code, null,
					locale);
		} catch (Exception e) {
		}
		return message;
	}

	public String getMessage(String code, Object[] args, Locale locale)
			throws NoSuchMessageException {
		String message = code;
		try {
			message = getResourceBundleMessageSource().getMessage(code,
					praseArgs(args, locale, this), locale);
		} catch (Exception e) {
		}
		return message;
	}

	public String getMessage(MessageSourceResolvable resolvable, Locale locale)
			throws NoSuchMessageException {
		return getResourceBundleMessageSource().getMessage(resolvable, locale);
	}

	private static Pattern p = Pattern.compile("\\$\\{([\\w.]+)\\}");

	private static Object[] praseArgs(Object[] args, Locale locale, I18N i18n) {
		if (args == null || args.length == 0) {
			return args;
		}
		StringBuffer sb = new StringBuffer(128);
		for (int i = 0; i < args.length; i++) {
			try {
				if (!(args[i] != null && (args[i] instanceof String))) {
					continue;
				}
				String str = (String) args[i];
				if (!(str.indexOf("${") > -1)) {
					continue;
				}
				sb.setLength(0);
				Matcher matcher = p.matcher(str);
				while (matcher.find()) {
					String replace = matcher.group();
					try {
						replace = i18n.getMessage(matcher.group(1), locale);
					} catch (Exception e) {
						e.printStackTrace();
					}
					matcher.appendReplacement(sb, replace);
				}
				matcher.appendTail(sb);
				args[i] = sb.toString();
			} catch (Exception e) {
			}
		}
		return args;
	}
}

异常信息国际化
1.在Spring配置文件中配置异常信息国际化

	<bean class="com.ce.common.util.I18N" lazy-init="false">
		<property name="namespace" value="ATMS" />
		<property name="resourceBundleMessageSource">
			<bean
				class="org.springframework.context.support.ResourceBundleMessageSource"
				lazy-init="false">
				<property name="basenames">
					<list>
						<value>i18n.atms.atms</value>
						<value>i18n.atms.messages</value>
					</list>
				</property>
			</bean>
		</property>
	</bean>

其中namespace中必需的，不同的项目其namespace需要不同，重复的namespace会出错
2.结合Action使用

	public String getMessage(HttpServletRequest request, String code,
			String defaultMessage, Object[] args) {
		return getI18N().getMessage(code, args, defaultMessage, request.getLocale());
	}

	public String getMessage(HttpServletRequest request, String code) {
		return getI18N().getMessage(code, request.getLocale());
	}

	public String getMessage(HttpServletRequest request, String code,
			Object[] args) {
		return getI18N().getMessage(code, args, request.getLocale());
	}

	public I18N getI18N() {
		return I18N.getI18N("ATMS");
	}

3.使用效果示例

error.a=添加 {0} 出错
error.b=实体B
error.c=实体C
getMessage(request, "error.a") --> 添加 {0} 出错
getMessage(request, "error.a", new Object[]{"Test"}) --> 添加 Test 出错
getMessage(request, "error.a", new Object[]{"${error.b}"}) --> 添加 实体B 出错