📄 admintemperature.java

📁 servlet初学者最好的例子……希望能对大家有所帮助

💻 JAVA

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package servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

@SuppressWarnings("serial")
public class AdminTemperature extends HttpServlet {

	protected void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		
		String temp=(String)getServletConfig().getServletContext().getAttribute("temp");
		if(temp==null)
		{ 			
			//初始化参数中拿
			temp=(String)getServletConfig().getInitParameter("temp");
			//放入应用上下文
			getServletConfig().getServletContext().setAttribute("temp", temp);
		}
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>气温更新</TITLE></HEAD>");
		out.println("  <BODY>");
		out.println("<TABLE border=\"0\" width=\"100%\"><TR>");
		out.println("<TD align=\"left\" valign=\"bottom\">");
		out.println("<H1>当前气温</H1></TD></TR></TABLE>");
		
		out.print("<FORM ACTION=\"");
		out.print(response.encodeURL("adminTemp"));
		out.println("\" METHOD=\"POST\">");
		out.println("当前气温（摄氏度）");
		out.println("<INPUT TYPE=\"text\" NAME=\"temp\""+" VALUE="+"temp"+">");
		out.println("<INPUT TYPE=\"Submit\" NAME=\"btn_submit\" VALUE=\"更新\">");
		out.println("  </FORM></BODY>");
		out.println("</HTML>");
		//out.flush();
		//out.close();
	}

	
	protected void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html;charset=gb2312");
		PrintWriter out = response.getWriter();
		
		String temp=request.getParameter("temp");
		//将更新后的气温放入上下文
		getServletConfig().getServletContext().setAttribute("temp", temp);
		out.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>气温更新</TITLE></HEAD>");
		out.println("  <BODY>");
		out.println("当前气温"+temp+"摄氏度");
		out.println("  </BODY>");
		out.println("</HTML>");
		
		//out.flush();
		//out.close();
	}

}

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