dynMusic sentrandomvalues ajaxtest.SentRandomValues sentrandomvalues /sentrandomvalues 2----------------------------------------------- index.jsp -- %> index width="100%" height="100%"> 3,------------------" />

java画直方图_java 实现直方图

发布于:2021-06-14 06:20:11

1----------------------------------------------------


web.xml


/p>


PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd">


dynMusic


sentrandomvalues


ajaxtest.SentRandomValues


sentrandomvalues


/sentrandomvalues


2-----------------------------------------------


index.jsp


--


%>


index



width="100%"


height="100%">


3,----------------------------------------------------------------


musicRec.svg


/p>


PUBLIC "-//W3C//DTD SVG 1.0//EN"


"http://www.w3.org/TR/2001/REC-SVG-20010904/DTD/svg10.dtd">



width="100%" height="100%" xmlns="http://www.w3.org/2000/svg"


οnlοad="timeEvent()">


function


timeEvent(){


showCustomer();


setTimeout("timeEvent()",1000);


}


function showCustomer()


{


xmlHttp=GetXmlHttpObject();


if


(xmlHttp==null)


{


alert ("Your browser does not support AJAX!");


return;


}


var


url="sentrandomvalues";


xmlHttp.onreadystatechange=stateChanged;


xmlHttp.open("GET",url,true);


xmlHttp.send(null);


}


function stateChanged()


{


if


(xmlHttp.readyState==4)


{


var


xmlDoc=xmlHttp.responseXML.documentElement;


random1=xmlDoc.getElementsByTagName("para")[0].childNodes[0].nodeValue;


random2=xmlDoc.getElementsByTagName("para")[2].childNodes[0].nodeValue;


random3=xmlDoc.getElementsByTagName("para")[1].childNodes[0].nodeValue;


random4=xmlDoc.getElementsByTagName("para")[3].childNodes[0].nodeValue;


create_a(random1,random2,random3,random4);


}


}


function GetXmlHttpObject()


{


var xmlHttp=null;


try


{


// Firefox, Opera 8.0+, Safari


xmlHttp=new XMLHttpRequest();


}


catch (e)


{


// Internet Explorer


try


{


xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");


}


catch (e)


{


xmlHttp=new


ActiveXObject("Microsoft.XMLHTTP");


}


}


return


xmlHttp;


}


function create_a(random1,random2,random3,random4)


{


var


rect1=document.getElementById("rect1");


var


rect2=document.getElementById("rect2");


var


rect3=document.getElementById("rect3");


var


rect4=document.getElementById("rect4");


var


text1=document.getElementById("text1");


var


text2=document.getElementById("text2");


var


text3=document.getElementById("text3");


var


text4=document.getElementById("text4");


rect1.setAttribute("height",250-random1);


rect1.setAttribute("y",2+eval(random1));


rect2.setAttribute("height",250-random2);


rect2.setAttribute("y",2+eval(random2));//如果写成2+random2时,会出现字符串相加


rect3.setAttribute("height",250-random3);


rect3.setAttribute("y",2+eval(random3));


rect4.setAttribute("height",250-random4);


rect4.setAttribute("y",2+eval(random4));


}



height="250"


fill="none" stroke="blue" stroke-width="2" />


//


y="50">


//


y="75">


//


y="100">


//


y="125">



fill="yellow" stroke="red" stroke-width="1">



x="125" y="2" height="250" width="15"/>



y="2" height="250" width="15"/>



height="250" width="15"/>



height="250" width="15"/>


4,----------------------------------------------------------


SerntRandomValues.java


package ajaxtest;


import javax.servlet.*;


import javax.servlet.http.*;


import


java.io.*;


import java.util.*;


public class SentRandomValues extends HttpServlet {


private


static final String CONTENT_TYPE = "text/html;


charset=GBK";


//Initialize global variables


public void init() throws ServletException


{


}


//Process the HTTP Get request


public void doGet(HttpServletRequest


request, HttpServletResponse response) throws ServletException, IOException


{


response.setContentType("text/xml");


response.setHeader("Cache-Control","no-cache");


StringBuffer sb=new


StringBuffer("");


sb.append("");


sb.append(((Math.random()*250)));


sb.append("");


sb.append("");


sb.append(((Math.random()*250)));


sb.append("");


sb.append("");


sb.append(((Math.random()*250)));


sb.append("");


sb.append("");


sb.append(((Math.random()*250)));


sb.append("");


sb.append("");


PrintWriter out =


response.getWriter();


System.out.println(sb.toString());


out.print(sb.toString());


out.flush();


}


//Process the HTTP Post request


public void doPost(HttpServletRequest


request, HttpServletResponse response) throws ServletException, IOException


{


doGet(request, response);


}


//Clean up resources


public void destroy() {


}


}







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