一個用于選擇不同語言的JSP頁面
分別為中文和英文的Properties的文件
用于加載中英文靜態文本的Servelt類
一個標簽處理類
一個標簽庫
根據選擇 顯示不同語言的JSP頁面
web.xml配置信息：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<html>
<head>
<title>welcome to hello jsp</title>
</head>
<body>
<p><font size=7>Welcome to helloApp</font></p>
<p><a href="WelcomeLogin.jsp?language=English">English Page</a></p>
<p><a href="WelcomeLogin.jsp?language=Chinese">Chinese Page</a></p>
</body>
</html>
分別為中文和英文的Properties的文件
hello.title=helloapp
hello.hi=Nice to meet you
login.title=helloapp
login.user=Username
login.password=Password
login.submit=Submit
hello.title=helloapp
hello.hi=你好
login.title=helloapp的登錄頁面
login.user=用戶名
login.password= 密碼
login.submit=登錄
用于加載中英文靜態文本的Servelt類
package Tag1;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Properties;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
init();
PrintWriter pw =response.getWriter();
pw.println("The resouce file is reloaded");
}
public void init() throws ServletException {
Properties ps =new Properties();
Properties ps_ch=new Properties();
ServletContext context =getServletContext();
InputStream in=context.getResourceAsStream("/WEB-INF/message.properties");
InputStream in_ch=context.getResourceAsStream("/WEB-INF/message_ch.properties");
try {
ps.load(in);
ps_ch.load(in_ch);
in.close();
in_ch.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
context.setAttribute("ps", ps);
context.setAttribute("ps_ch", ps_ch);
}
}
一個標簽處理類
package Tag1;
import java.util.Properties;
import javax.servlet.http.HttpSession;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.tagext.TagSupport;
public class MessageTag extends TagSupport {
private String key =null;
public String getKey() {
return key;
}
public void setKey(String key) {
this.key = key;
}
@Override
public int doEndTag() throws JspException {
try{
Properties ps =(Properties)pageContext.getAttribute("ps", pageContext.APPLICATION_SCOPE);
Properties ps_ch=(Properties)pageContext.getAttribute("ps_ch", pageContext.APPLICATION_SCOPE);
HttpSession session=pageContext.getSession();
String language=(String)session.getAttribute("language");
String message=null;
if(language!=null&&language.equals("Chinese")){
message =(String)ps_ch.get(key);
message=new String(message.getBytes("ISO-8859-1"),"UTF-8");
}else{
message=(String)ps.get(key);
}
pageContext.getOut().println(message);
}catch(Exception e){
e.printStackTrace();
}
return EVAL_PAGE;
}
}
一個標簽庫
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE taglib PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>MyTag</short-name>
<uri>/MyTag</uri>
<tag>
<name>MyTag</name>
<tag-class>Tag1.MessageTag</tag-class>
<body-content>empty</body-content>
<attribute>
<name>key</name>
<required>true</required>
</attribute>
</tag>
</taglib>
根據選擇 顯示不同語言的JSP頁面
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/WEB-INF/MyTag.tld" prefix="cc"%>
<html>
<%
String language=request.getParameter("language");
if(language==null)
language="English";
session.setAttribute("language",language);
%>
<head>
<title><cc:MyTag key="login.title"/></title>
</head>
<body>
<br>
<form name="LoginForm" method="post" action="Welcomout.jsp">
<cc:MyTag key="login.user"/>:<br>
<input type="text" name="username"><br>
<cc:MyTag key="login.password"/>:<br>
<input type="password" name="password"/><br>
<input type="submit" value="<cc:MyTag key="login.submit"/>"/><br/>
</form>
</body>
</html>
web.xml配置信息：
<jsp-config>
<taglib>
<taglib-uri>/WEB-INF/MyTag.tld</taglib-uri>
<taglib-location>/WEB-INF/MyTag.tld</taglib-location>
</taglib>
</jsp-config>
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