struts2的页面语言切换

页面语言切换用到的是I18nInterceptor拦截器

jsp页面

	<a href="testI18n.action?request_locale=en_US">English</a>    
	<a href="testI18n.action?request_locale=zh_CN">中文</a><br>
	<a href="index.jsp">index page</a>
	<br>
	<s:text name="time">
		<s:param value="date"/>
	</s:text>
	<br>
	<s:text name="password"></s:text>
	<s:form>
		<s:textfield label="%{getText('name')}"/>
		<s:textfield key="name"/>
		<s:textfield key="password"/>
		<s:submit key="submit"/>
	</s:form>

对应的action

public class TestI18nAction extends ActionSupport{
	private static final long serialVersionUID = 1L;
	private Date date;
	
	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}

	public String execute(){
		this.date = new Date();
		String name = getText("name");
		System.out.println(name);
		String time = getText("time", Arrays.asList(date));
		System.out.println(time);
		return Action.SUCCESS;
	}
}

至于URL的请求参数为什么是request_locale，这是由拦截器的源码决定的

public class I18nInterceptor extends AbstractInterceptor {
    private static final long serialVersionUID = 2496830135246700300L;

    protected static final Logger LOG = LoggerFactory.getLogger(I18nInterceptor.class);

    public static final String DEFAULT_SESSION_ATTRIBUTE = "WW_TRANS_I18N_LOCALE";
    public static final String DEFAULT_PARAMETER = "request_locale";
    public static final String DEFAULT_REQUESTONLY_PARAMETER = "request_only_locale";

    protected String parameterName = DEFAULT_PARAMETER;
    protected String requestOnlyParameterName = DEFAULT_REQUESTONLY_PARAMETER;
    protected String attributeName = DEFAULT_SESSION_ATTRIBUTE;

所以只要每次请求都经过拦截器，且请求参数有指定语言的话，就能显示指定的语言格式（从国际资源文件中找）