Struts2 (13) internationalization-internationalization, struts2 internationalization

Struts2 (13) internationalization-internationalization, struts2 internationalization
I. What is internationalization-I18N

Internationalization

There are 18 letters between the first letter I-ending letter n

Feature: when the program is not modified, the corresponding content can be displayed according to different language environments.

Ii. Java built-in Internationalization

 

Message_en_US.properties

demo = hello world!userName = user namepassword = passwordwelcome = welcome!

Message_zh_CN.properties

demo = \u60A8\u597D\u4E16\u754C!userName = \u7528\u6237\u540Dpassword = \u5BC6\u7801welcome = \u6B22\u8FCE!

Message. properties

demo = \u60A8\u597D\u4E16\u754C!userName = \u7528\u6237\u540Dpassword = \u5BC6\u7801welcome = \u6B22\u8FCE!

Implementation Code

<% @ Page import = "java. util. resourceBundle "%> <% @ page import =" java. util. locale "%> <% @ page language =" java "contentType =" text/html; charset = UTF-8 "pageEncoding =" UTF-8 "%> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> Iii. Implementation of Struts2
Prepare a global resource file: usually at least three files
Naming rules: prefix name_ _ country. properties
Content format: key = value
Specify resource files (set constants)
1. In the struts. xml file:
    <constant name="struts.custom.i18n.resources" value="message" />
2. struts. properties:
struts.custom.i18n.resources=message
 
<s:text name="demo"></s:text><s:text name="userName" /><s:text name="password" /><s:text name="welcome" />
Change resource file
Message. properites
Demo = Hello world! UserName = userName password = password welcome = welcome! Submit = submit reset = reset
Message_zh_CN.properties
Demo = Hello world! UserName = userName password = password welcome = welcome! Submit = submit reset = reset
Message_en_US.properties
demo = hello world!userName = user namepassword = passwordwelcome = welcome!submit =submitreset=reset
<% @ Page language = "java" contentType = "text/html; charset = UTF-8 "pageEncoding =" UTF-8 "%> <% @ taglib prefix =" s "uri ="/struts-tags "%> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> 
Iv. Internationalization of Action
Message. properties
Demo = Hello world! UserName = userName password = password welcome = {0} welcome! {1} submit = submit reset = reset fail = Logon Failed usermsg = username cannot be blank usermsglength = username length is 2-16 bits pwdmsg = password cannot be blank pwdmsglength = password length is 2-16 bit
Message_zh_CN.properties is the same as above
Message_en_US.properties
demo = hello world!userName = user namepassword = passwordwelcome = {0}welcome!{1}submit =submitreset=resetfail=login failedusermsg=user name do not emptyusermsglength=user name length is 2 to 16!pwdmsg=password do not emptypwdmsglength=password length is 2 to 16!
Struts. xml
<struts>    <constant name="struts.enable.DynamicMethodInvocation" value="false" />    <constant name="struts.devMode" value="true" />    <constant name="struts.custom.i18n.resources" value="message" />    <package name="default" namespace="/" extends="struts-default">    <action name="login" class="action.LoginAction" method="login">    <result name="success">    /demo.jsp    </result>    <result name="input">    /demo.jsp    </result>    </action> </package></struts>
Demo. jsp
<% @ Page language = "java" contentType = "text/html; charset = UTF-8 "pageEncoding =" UTF-8 "%> <% @ taglib prefix =" s "uri ="/struts-tags "%> <! DOCTYPE html PUBLIC "-// W3C // dtd html 4.01 Transitional // EN" "http://www.w3.org/TR/html4/loose.dtd"> 
LogionAction
package action;import com.opensymphony.xwork2.ActionSupport;public class LoginAction extends ActionSupport {    private String username;    private String password;    public String login() {        if ("admin".equalsIgnoreCase(username)                && "admin".equalsIgnoreCase(password)) {            this.addActionMessage(this.getText("welcome", new String[] {                    username,password}));            return SUCCESS;        }        this.addActionMessage(this.getText("fail"));        return INPUT;    }    public String getUsername() {        return username;    }    public void setUsername(String username) {        this.username = username;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}
LogionAction. login () authentication File
LogionAction-login-validation.xml
 
<?xml version="1.0" encoding="UTF-8"?><!DOCTYPE validators PUBLIC "-//Apache Struts//XWork Validator 1.0.3//EN"        "http://struts.apache.org/dtds/xwork-validator-1.0.3.dtd"><validators><field name="username"><field-validator type="requiredstring"><param name="trim">true</param><message>${getText("usermsg")}</message></field-validator><field-validator type="stringlength"><param name="trim">true</param><param name="minLength">2</param><param name="maxLength">16</param><message>${getText("usermsglength")}</message></field-validator></field><field name="password"><field-validator type="requiredstring"><param name="trim">true</param><message>${getText("pwdmsg")}</message></field-validator><field-validator type="stringlength"><param name="trim">true</param><param name="minLength">2</param><param name="maxLength">16</param><message>${getText("pwdmsglength")}</message></field-validator></field></validators>
 
V. Jsp page international parameter transfer
<!-- First Example --><s:i18n name="struts.action.test.i18n.Shop">    <s:text name="main.title"/></s:i18n><!-- Second Example --><s:text name="main.title" /><!-- Third Examlpe --><s:text name="i18n.label.greetings">   <s:param >Mr Smith</s:param></s:text>
 
<s:text name="welcome"><s:param>admin</s:param><s:param>ffff</s:param></s:text>
6. resource search sequence
7. Use internationalization in JSP
When using the UI form flag, getText can be used to set the label attribute, for example, <s: textfield name = "name" label = "% {getText ('username')}"/>
8. Use OGNL expressions in resource files
In many cases, we need to insert some parameters for international characters in the dynamic runtime, for example, when entering the verification prompt information. In Struts 2.0, we can use ognl in the international string of the resource file to do this: The format is $ {expression}, for example:
validation.require=${fileName} is required
9. Resource file search sequence