messagetag.java

Tomcat与Java.Web开发技术详解源代码

package mypack;
import javax.servlet.jsp.JspException;
import javax.servlet.jsp.JspTagException;
import javax.servlet.jsp.tagext.TagSupport;
import javax.servlet.http.HttpSession;
import java.util.*;
import java.io.*;

public class MessageTag extends TagSupport
{
     private String key=null;

    public  MessageTag() {
    }
    public String getKey(){
      return this.key;
    }

    public void setKey(String key){
      this.key=key;
    }

    // Method called when the closing hello tag is encountered
    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"),"GB2312");
            }	
            else
              message=(String)ps.get(key);
            pageContext.getOut().print(message);
        }
        catch (Exception e) {
            throw new JspTagException(e.getMessage());
        }
        // We want to return SKIP_BODY because this Tag does not support
        // a Tag Body
        return SKIP_BODY;
    }

    public void release() {
        super.release();
    }

}