摘要: 项目有需求实现让用户选择语言来切换不用语言的显示，这个Koala i18n组件默认是根据浏览器语言来显示，实现这个需求需要修改扩展代码
i18n组件中I18nTag类默认是通过request.getLocale().toString()来获取浏览器语言，实现用户自由切换语言需改动如下：
- 界面提供可切换的语言选择
- 把要切换的语言存入session
- 标签解析先从session获取语言
提供语言选择
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<%@ taglib uri="http://www.openkoala.org/i18n" prefix="koala" %>
<!DOCTYPE html>
<html>
<head>
<title>I18N</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="/lib/jquery-1.8.3.min.js" type="text/javascript"></script>
</head>
<body>
<select id="langSelect">
<option value="zh_CN">请选择</option>
<option value="zh_CN">中文</option>
<option value="en_US">English</option>
</select>
I18N:<koala:i18n key="test" />
<script type="text/javascript">
$(function(){
$("#langSelect").change(function ()
{
if (this.value)
{
$.post('${pageContext.request.contextPath}/international/switchLanguage.koala?locale=' + this.value).done(function(data){
if(data.result == 'success'){
window.location.reload();
}else{
alert("fail");
}
});
} else
{
}
});
});
</script>
</body>
</html>
选中语言存入Session
创建I18NController类
package com.xiaokaceng.demo.web.controller;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpSession;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
@Controller
@RequestMapping("/international")
public class I18NController {
@ResponseBody
@RequestMapping("/switchLanguage")
public Map<String, Object> switchLanguage(String locale, HttpSession session) {
if (locale == null || locale.isEmpty()) {
session.setAttribute("locale", "zh_CN");
} else {
session.setAttribute("locale", locale);
}
Map<String, Object> result = new HashMap<String, Object>();
result.put("result", "success");
return result;
}
}
扩展I18nTag类
package com.xiaokaceng.demo.web.tag;
import java.io.IOException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.PageContext;
import javax.servlet.jsp.tagext.SimpleTagSupport;
import org.openkoala.framework.i18n.I18NManager;
public class I18nTag extends SimpleTagSupport {
private String key;
private String locale;
public void setKey(String key) {
this.key = key;
}
public void setLocale(String locale) {
this.locale = locale;
}
public void doTag() throws JspException, IOException {
String message = null;
HttpServletRequest request = (HttpServletRequest) ((PageContext) getJspContext()).getRequest();
try {
if (this.locale == null) {
this.locale = (String) request.getSession().getAttribute("locale");
}
if (this.locale == null) {
message = I18NManager.getMessage(this.key, request.getLocale().toString());
} else {
message = I18NManager.getMessage(this.key, this.locale);
}
} catch (Exception e) {
message = this.key;
e.printStackTrace();
}
getJspContext().getOut().write(message);
}
}
效果
DEMO代码下载
http://pan.baidu.com/s/1jGn51wM
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