SpringMVC基于session存储注解的值 (全局使用)

用户网站 有一个中英文切换的地方，会把切换后的language的属性值l, 存入session

这个值language在多个控制器参数里面会被调用，现在将其声明为注解 利用拦截器

再切换语言的时候 修改language的值

利用aop思想 一处修改多处直接拿到该值 不需要每次都在从session中获得该值 稍微方便一下下。。

1.注解声明

@Target(ElementType.PARAMETER)

@Retention(RetentionPolicy.RUNTIME)

@Documented

public @interface Language {

String value() default "language";

}

2 . 拦截器

public class LanguageValueInterceptor implements HandlerMethodArgumentResolver {

@Override

public boolean supportsParameter(MethodParameter parameter) {

return parameter.getParameterAnnotation(Language.class) != null;

}

@Override

public Object resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer,

NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception {

Language parameterAnnotation = parameter.getParameterAnnotation(Language.class);

if (parameterAnnotation != null) {

String attributeKey = parameterAnnotation.value();

HttpServletRequest nativeRequest = (HttpServletRequest) webRequest.getNativeRequest();

return nativeRequest.getSession().getAttribute(attributeKey);//现在是从session中获取

}

return null;

}

}

3 拦截器配置文件

<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"

xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task" xmlns:tx="http://www.springframework.org/schema/tx"

xmlns:util="http://www.springframework.org/schema/util" xmlns:jaxws="http://cxf.apache.org/jaxws" xmlns:flex="http://www.springframework.org/schema/flex"

xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.1.xsd //注意这里是3.1 3.0会报错
http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-3.0.xsd
http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd
http://cxf.apache.org/jaxws http://cxf.apache.org/schemas/jaxws.xsd http://www.springframework.org/schema/flex http://www.springframework.org/schema/flex/spring-flex-1.0.xsd">
<context:component-scan base-package="com.bimatrix.revit.controller" />

<!-- <mvc:annotation-driven conversion-service="conversionService" /> -->

<mvc:annotation-driven conversion-service="conversionService">

<mvc:argument-resolvers>

<bean class="com.bimatrix.revit.interceptor.LanguageValueInterceptor" />

</mvc:argument-resolvers>

</mvc:annotation-driven>

<mvc:default-servlet-handler />

4.中英文切换的地方 写入session

@RequestMapping(value = "changeLanguage", method = RequestMethod.GET)

public String changeLanguage(HttpServletRequest request, HttpServletResponse response,String locale,

@Language String language) {

List<RevitNewEntity> hotRevitList = revitNewEntityService.getHotRevit();

request.setAttribute("hotRevitList", hotRevitList);

List<RevitAddInShowDto> nowDownList = revitNewEntityService.getDownLoadNowRevit();

request.setAttribute("nowDownList", nowDownList);

System.out.println("0 当前language :"+language );

System.out.println("1 当前lan :"+request.getSession().getAttribute("language") );

String langType = locale;

if(langType==null||langType.equals("")){

return "/index";

}else{

if (langType.equals("zh")) {

Locale locale1 = new Locale("zh", "CN");

request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, locale1);

request.getSession().setAttribute("language", "zh");

} else if (langType.equals("en")) {

Locale locale1 = new Locale("en", "US");

request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, locale1);

request.getSession().setAttribute("language", "en");

} else {

request.getSession().setAttribute(SessionLocaleResolver.LOCALE_SESSION_ATTRIBUTE_NAME, LocaleContextHolder.getLocale());

}

}

System.out.println("2 当前lan :"+request.getSession().getAttribute("language") );

return "/index";

}

切换输出效果

0 当前language :null

1 当前lan :null

2 当前lan :zh

0 当前language :zh

1 当前lan :zh

2 当前lan :zh

说明language 已经写入session

这样其他地方 控制器 就可以直接获得 注解的值了。。

@RequestMapping(value = "list", method = RequestMethod.GET)

public ModelAndView list(SearchRevitVO vo, Integer sortType , HttpServletRequest request,@Language String language) throws Exception {

5. jsp页面的直接使用 实现数据库级别的网站国际化，对于小网站可以对该表增加英文字段 减少开发周期

<c:if test="${sessionScope.language eq 'en' }">

${tag.nameEn}

</c:if>

<c:if test="${sessionScope.language eq 'zh' || sessionScope.language eq null}"> //null是初始化时候防止显示为空

${tag.name}

</c:if>

这么看 其实第四步可能没有必要 第五步才是需求使用的 只需要存到session也可以