应用国际化（2） -欧洲杯足彩官网

介绍了应用国际化需要考虑的问题，本篇介绍后端如何实现提示语的国际化。

先说说系统框架，本项目采用react spring mybatis rabbitmq redis等主流框架组合搭建而成，前后端分离。不得不说，在spring framework的加持下，做什么事情都方便的多。

1、添加langcookiefilter，拦截参数中带有lang的请求，并将语言标识存入cookie。

import java.io.ioexception;
import javax.servlet.filter;
import javax.servlet.filterchain;
import javax.servlet.filterconfig;
import javax.servlet.servletexception;
import javax.servlet.servletrequest;
import javax.servlet.servletresponse;
import javax.servlet.http.cookie;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import org.apache.commons.lang3.stringutils;
public class langcookiefilter implements filter {
    // 默认参数名称
    public static final string default_param_name = "lang";
    
	@override
	public void init(filterconfig filterconfig) throws servletexception {}
	@override
	public void dofilter(servletrequest arg0, servletresponse arg1, filterchain chain)
			throws ioexception, servletexception {
		
		httpservletrequest request = (httpservletrequest)arg0;
		httpservletresponse response = (httpservletresponse)arg1;
		
		string lang = request.getparameter(default_param_name);
		if(stringutils.isnotempty(lang)){
			cookie[] cookies = request.getcookies();
			boolean flag = false;
			if(cookies != null){
				for (cookie cookie : cookies) {
					if(cookie.getname().equals(default_param_name)){
						cookie.setvalue(lang);
						flag = true;
					}				
				}				
			}
			if(!flag){
				cookie cookie = new cookie(default_param_name, lang);
				cookie.sethttponly(true);
				response.addcookie(cookie);
			}			
		}
		chain.dofilter(arg0, arg1); 
	}
	@override
	public void destroy() {}
}

2、配置web.xml  将langcookiefilter添加到web.xml中。另外还需配置requestcontextlistener监听，方便在messagesourceutils中使用。

	
	
		langcookiefilter
		com.rongdu.framework.core.common.cookie.langcookiefilter
	
	
		langcookiefilter
		*.htm
	
	

        org.springframework.web.context.request.requestcontextlistener  

   后来看了requestcontextlistener代码，感觉langcookiefilter的做法有些多余，后续再研究。

3、springmvc配置文件中添加i18n支持

	  
	
		
	  
	
	  
	  
	      
	          
	              
	            classpath:i18n/message  
	            classpath:org/hibernate/validator/validationmessages  
	          
	      
	      
	      
	      
	

4、添加messagesourceutils工具类，获取国际化文件中国际化字段信息

import java.util.locale;
import javax.servlet.http.cookie;
import javax.servlet.http.httpservletrequest;
import org.springframework.web.context.request.requestcontextholder;
import org.springframework.web.context.request.servletrequestattributes;
import com.rongdu.framework.core.common.context.constant;
import com.rongdu.framework.core.common.cookie.langcookiefilter;
/**
 * 国际化语言工具类
 * @author lh@erongdu.com
 * @version 2.0
 * @since 2018-12-26
 *
 */
public class langutil {
	
	public static string get(){
		httpservletrequest request = ((servletrequestattributes) requestcontextholder.getrequestattributes()).getrequest();
    	cookie[] cookies = request.getcookies();
    	if(cookies != null){    		
	    	for (cookie cookie : cookies) {
				if(cookie.getname().equals(langcookiefilter.default_param_name)){
					return cookie.getvalue();
				}
	    	}
		}
    	return constant.default_lang;		
	}
	public static locale getlocale(){
    	return new locale(get());
    }
}

import java.util.locale;
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import org.springframework.beans.factory.annotation.autowired;
import org.springframework.context.messagesource;
import org.springframework.stereotype.component;
/**
 * 资源国际化工具类
 * @author lh@erongdu.com
 * @version 2.0
 * @since 2018-12-24
 */
@component
public class messagesourceutils {
    // 日志
    private static final logger logger = loggerfactory.getlogger(messagesourceutils.class);
    
    private static messagesource messagesource;
    
    @autowired
    public void setmessagesource(messagesource messagesource) {
		messagesourceutils.messagesource = messagesource;
	}
    /**
     * 获取国际化文件中国际化字段信息
     * @param key	国际化参数
     * @param args	动态参数
     * @return
     */
    public static string getmessage(string key, object[] args) {
    	try {
    		return messagesource.getmessage(key, args, key, langutil.getlocale());
    	} catch (exception e) {
    		logger.error(e.getmessage());
    	}
    	return key;
    }
    
    /**
     * 可供后台使用
     * 获取国际化文件中中文字段信息
     * @param key	国际化参数
     * @param args	动态参数
     * @return
     */
    public static string getchinesemessage(string key, object[] args) {
    	try {
    		return messagesource.getmessage(key, args, key, locale.chinese);
    	} catch (exception e) {
    		logger.error(e.getmessage());
    	}
    	return key;
    }
    
//	/**
//     * 获取国际化文件中国际化字段信息
//     * @param key	国际化key
//     * @param args	动态参数
//     * @return
//     */
//    public static string getmessage(string key, object[] args) {
//        try {
//            locale locale = localecontextholder.getlocale();
//            return messagesource.getmessage(key, args, key, locale);
//        } catch (exception e) {
//        	logger.error(e.getmessage());
//        }
//        return key;
//    }
}

5、在controller、service等层使用messagesourceutils工具类

import org.springframework.stereotype.controller;
import org.springframework.ui.model;
import org.springframework.web.bind.annotation.requestmapping;
import com.rongdu.framework.core.common.util.messagesourceutils;
@controller
public class indexcontroller{
	/**
	 * 凯发推荐首页
	 * @return
	 * @throws exception
	 */
	@requestmapping(value = "/home.htm")
	public string home(model model){
		model.addattribute("title", messagesourceutils.getmessage("title", null));
		return "home";
	}
	
}