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  • Struts2>I18N 小强斋

    一、国际化原理


     首先指定全局的国际化资源文件:在配置文件struts.xml中引入 

    <constant name="struts.custom.i18n.resources" value="app"></constant>

    或在src下面新建struts.properties文件中指定如下一行:struts.custom.i18n.resources=app
     指定的国家化资源文件即为 xxx_语言_国家.properties,如上例为app_en_US.properties  app_zh_CN.properties
    里面的内容分别为

    welcome.msg=hello,sir
welcome.msg=\u6B22\u8FCE\u4F60\uFF01
    ResourceBundle rs=ResourceBundle.getBundle("app",Locale.CHINA);
ResourceBundle rs=ResourceBundle.getBundle("app",Locale.US);
String welcome=rs.getString("welcome.msg");

    二、struts2的国际化 

    Struts2的国际化分三种情况：前台页面的国际化，Action类中的国际化，配置文件的国际化。
    2.1前台页面的国际化

    JSP页面上的国际化(使用struts2的<s:text .../>):

    <s:i18n name="app">
   <s:text name="hello">
     <s:param>${username}</s:param>
   </s:text>
 </s:i18n>

    表单元素的Label国际化,使用key:，值为properties文件中的key标签中key大多是和国际化相关的

    <s:textfield name="username" key="name"></s:textfield>
<s:textfield name="password" key="password"></s:textfield>

    2.2Action中的国际化

    String message=getText("password.error");
this.addFieldError("password", message);

    (3)配置文件的国际化

    Struts2基于XML配置方式实现对Action方法进行校验，并对校验信息国际化。参照http://blog.csdn.net/furongkang/article/details/6922046

    三、动态语言切换

    传递一个参数request_locale即可

    <s:url id="url" action="lang">
			<s:param name="request_locale">en_US</s:param>
		</s:url>
		<s:a href="%{url}" key="english">
			<s:text name="english" />
		</s:a>

		<s:url id="url1" action="lang">
			<s:param name="request_locale">ch_CN</s:param>
		</s:url>
		<s:a href="%{url1}">
			<s:text name="chinese" />
		</s:a>



		<a href="lang?request_locale=en_US"><s:text name="english"></s:text>
		</a>
		<a href="lang?request_locale=ch_CN"><s:text name="chinese"></s:text>

    Struts.xml配置action为lang时候跳到自身

    	<action name="lang">
			<result>/add.jsp</result>
		</action>

    四、国际化资源文件的分类

    当应用程序很大时，需要国际化的东西会很多，因此需要将国际化资源文件进行分类。在src中的properties文件是全局资源文件，另外还可以分为包级别的和类级别的

    4.1全局资源文件

    在src中的properties文件是全局资源文件

    4.1包级别

    命名规则为package_language_country.properties  如package_en_US.properties

    4.2类级别

    如RegisterAction_en_US.properties

    国际化资源文件的优先级

    全局<包级别<类级别

    另外要进行表单的国际化时，要去掉theme="simple"

                                                                                                                                                                               

    例子：

    login.jsp

    <%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
 String path = request.getContextPath();
 String basePath = request.getScheme() + "://"
   + request.getServerName() + ":" + request.getServerPort()
   + path + "/";
%>
<%@taglib uri="/struts-tags" prefix="s"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
  <base href="<%=basePath%>">

  <title>My JSP 'index.jsp' starting page</title>
  <meta http-equiv="pragma" content="no-cache">
  <meta http-equiv="cache-control" content="no-cache">
  <meta http-equiv="expires" content="0">
  <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
  <meta http-equiv="description" content="This is my page">
 </head>

 <body>
 <s:fielderror/>
  <s:form id="login" action="user!login">
   <s:text name="name" />
   <input name="name" />
   <br />
   <s:text name="password" />
   <input name="password" type="password" />
   <br />
   <s:submit key="login">
   </s:submit>
  </s:form>

  <s:url id="url" action="lang">
   <s:param name="request_locale">en_US</s:param>
  </s:url>
  <s:a href="%{url}" key="english">
   <s:text name="english" />
  </s:a>

  <s:url id="url1" action="lang">
   <s:param name="request_locale">ch_CN</s:param>
  </s:url>
  <s:a href="%{url1}">
   <s:text name="chinese" />
  </s:a>

 

  <a href="lang?request_locale=en_US"><s:text name="english"></s:text>
  </a>
  <a href="lang?request_locale=ch_CN"><s:text name="chinese"></s:text>
  </a>
 </body>
</html>

    login_success.jsp

    package com.ncepu.struts2;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

 private static final long serialVersionUID = 1L;
 private String name;
 private String password; 

 

 public String getName() {
  return name;
 }

 public void setName(String name) {
  this.name = name;
 }

 public String getPassword() {
  return password;
 }

 public void setPassword(String password) {
  this.password = password;
 }

 public String login() {
  if ("".equals(name)) {
   String message=getText("username.error");
   this.addFieldError("name", message);
   return "error";
  }
  if ("".equals(password)) {
   String message=getText("password.error");
   this.addFieldError("password", message);
   return "error";
  }
  System.out.println("name=" + name + "password=" + password);
  return ("success");
 }

}

    LoginAction.java

    package com.ncepu.struts2;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {

	private static final long serialVersionUID = 1L;
	private String name;
	private String password; 

	

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public String login() {
		if ("".equals(name)) {
			String message=getText("username.error");
			this.addFieldError("name", message);
			return "error";
		}
		if ("".equals(password)) {
			String message=getText("password.error");
			this.addFieldError("password", message);
			return "error";
		}
		System.out.println("name=" + name + "password=" + password);
		return ("success");
	}

}

    struts.xml

    <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd">

<struts>

	<constant name="struts.devMode" value="true" />
	<constant name="struts.custom.i18n.resources" value="message"></constant>

	<package name="default" namespace="/" extends="struts-default">

		<action name="user" class="com.ncepu.struts2.LoginAction">
			<result name="success">
				/login_success.jsp
            </result>

			<result name="error">
				/login.jsp
            </result>
		</action>

		<action name="lang">
			<result>/login.jsp</result>
		</action>

	</package>
</struts>

    web.xml

    <?xml version="1.0" encoding="UTF-8"?>
<web-app id="WebApp_9" version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>Struts Blank</display-name>

    <filter>
        <filter-name>struts2</filter-name>
        <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
    </filter>

    <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <welcome-file-list>
        <welcome-file>login.jsp</welcome-file>
    </welcome-file-list>

</web-app>

    message_en_US.properties

    name=username
password=password
login=login
username.error = the username error !
password.error = the password error!
chinese=chinese
english=english
name.empty = the username should not be empty \!  
name.size = the size of username should be between 6 and 12 \! 
login.success=login success\!

    message_zh_CN.properties

    name=\u7528\u6237\u540D
password=\u5BC6\u7801
login=\u767B\u9646
username.error = \u7528\u6237\u540D\u9519\u8BEF
password.error = \u5BC6\u7801\u9519\u8BEF
english=\u82F1\u8BED
chinese=\u4E2D\u6587
name.empty=\u7528\u6237\u540D\u4E0D\u80FD\u4E3A\u7A7A
name.size=\u7528\u6237\u540D\u5FC5\u987B\u4E3A6-12\u4F4D
login.success=\u767B\u9646\u6210\u529F

    ps:   jsp页面少了<%@taglib uri="/struts-tags" prefix="s"%>，会导致国际化显示错误。

     

    文章：  http://www.blogjava.net/toby/archive/2009/03/19/260918.html

            http://www.cnblogs.com/langlang/archive/2010/01/14/1647627.html

            http://blog.csdn.net/furongkang/article/details/6922046

     

     

     
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  • 原文地址：https://www.cnblogs.com/xiaoqiangzhaitai/p/5637521.html
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