ResourceBundle种

ResourceBundle类

package TestI18N;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.Locale;
import java.util.ResourceBundle;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class TestResourceBundle extends HttpServlet {


	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
          
		   
		    ResourceBundle resource=ResourceBundle.getBundle("resouce_ch");
		    String key="key";
		    String message =resource.getString(key);
		    System.out.println(message);
		    String key1="key1";
		    String message1 =resource.getString(key1);
	        System.out.println(message1);
	}

	
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
            doGet(request, response);
	}

}

在ResourceBundle加载的资源文件resource_ch.properties要放在WEB-INF的classes的目录下，一直存放在WEB-INF下会出错？  why?