Go语言视频零基础入门到精通

javalearner

主文件:index.jsp
<%@ page language="java" %>
<%@ page import="java.io.OutputStream" %>
<%@ page import="java.awt.image.BufferedImage" %>
<%@ page import="java.awt.*" %>
<%@ page import="com.sun.image.codec.jpeg.*" %>  

<%@ include file = "graphBG.jsp"%>

<%  

//Data arrays
String datanames[] =
    {"Apples", "Oranges", "Peaches", "Lemons", "Grapefruit"}; int datavalues[] = {11, 62, 33, 102, 50};
  
  
   
   
     
   
                    
     
   
  

//current y position
int y_pos = 0;

//y offset to cater for header space
int headerOffset = 50;   

//inner padding to make sure bars never touch the outer border
int innerOffset = 20;

//height of bar, text and total
int barHeight = 10;
int textHeight = 20;
int displayHeight = barHeight + textHeight;

//Color used for the bars
Color barColor = new Color(153,19,19);

//Set the graph"s outer width
int WIDTH  = 300;

//Set the graph"s outer height
int HEIGHT = (datavalues.length * displayHeight) + headerOffset + innerOffset;

//Width of the graphable area
int innerWIDTH = WIDTH - (innerOffset * 2);

//Calculate average
int average = 0;
for(int i=0; i<datavalues.length; i++)
{
average += datavalues;
}
average = average / datavalues.length;

//Calculate maximum
int maximum = 0;
for(int i=0; i<datavalues.length; i++)
{
if(datavalues > maximum)
{
maximum = datavalues;
}
}




///////////////////////////////////////////////////////////////////////////////////////
//Draw Graph Background and Header:
///////////////////////////////////////////////////////////////////////////////////////

response.setContentType("image/jpeg");
BufferedImage bi = new BufferedImage(WIDTH, HEIGHT, BufferedImage.TYPE_INT_RGB);
Graphics2D biContext = bi.createGraphics();
graphBG gr = new graphBG();
gr.draw(biContext, WIDTH, HEIGHT, "Farm Produce", "Overall Average: " + average);



/////////////////////////////////////////////////////////////////////////////////////
//Draw data onto the graph:
/////////////////////////////////////////////////////////////////////////////////////


//Loop through & draw the bars

for(int i=0; i<datavalues.length; i++)
{
int currentValue = datavalues;

//Set y position for bar
y_pos = i * displayHeight + headerOffset;

//Set bar width
int barWidth = (innerWIDTH * currentValue) / maximum;

//Display the current value
String display = datanames + " (" + currentValue + ")";
biContext.setColor(Color.black);
biContext.drawString(display, 20, y_pos);

//Set dimensions of the bar
biContext.setColor(barColor);
Dimension bar = new Dimension(barWidth , barHeight);
Dimension barBorder = new Dimension(barWidth - 3 , barHeight - 3);
Rectangle barRect = new Rectangle(bar);
Rectangle barRectBorder = new Rectangle(barBorder);

//Draw bar and border:
barRect.setLocation(21, 5 + y_pos);
barRectBorder.setLocation(22, 6 + y_pos);
biContext.setColor(barColor);
biContext.fill(barRect);
biContext.setColor(Color.white);
biContext.draw(barRectBorder);
}



/////////////////////////////////////////////////////////////////////////////////////
//Display the graph
/////////////////////////////////////////////////////////////////////////////////////

//Encode:
OutputStream output = response.getOutputStream();
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(output);
encoder.encode(bi);
output.close();

%>

下面是graphBG.jsp
<%!
public class graphBG
{

Font font = new Font("ARIAL", Font.BOLD , 11);
Color headerColor = new Color(20,50,100);

public Graphics2D draw(Graphics2D biContext, int WIDTH, int HEIGHT, String headerText, String averageText)
{
//Grey color for the drop shadow
Color dropShadow = new Color(200,200,200);

//Graph and header dimensions
Dimension dim = new Dimension(WIDTH,HEIGHT);
Dimension dimGraph = new Dimension(WIDTH-21,HEIGHT-51);
Dimension dimHeader = new Dimension(WIDTH-21,20);

//Define Rectangles:
Rectangle area = new Rectangle(dim);
Rectangle graphArea = new Rectangle(dimGraph);
Rectangle headerArea = new Rectangle(dimHeader);

/////////////////////////////////////////////////////////////////////////////////////
//Set up the graph:
/////////////////////////////////////////////////////////////////////////////////////

//Set background color to white:
biContext.setColor(Color.white);
biContext.fill(area);

//Drop shadow for the graph area:
graphArea.setLocation(18, 42);   //This is the drop shadow"s location
biContext.setColor(dropShadow);
biContext.fill(graphArea);

//Fill the graph area (white):
graphArea.setLocation(11, 36);
biContext.setColor(Color.white);
biContext.fill(graphArea);

//Draw the graph border (black):
biContext.setColor(Color.black);
biContext.draw(graphArea);


//Header Drop Shadow:
headerArea.setLocation(18, 12);   //This is the drop shadow"s location
biContext.setColor(dropShadow);
biContext.fill(headerArea);

//Fill the header (blue):
headerArea.setLocation(11, 5);
biContext.setColor(headerColor);
biContext.fill(headerArea);

//Draw the header border (white):
biContext.setColor(Color.white);
biContext.draw(headerArea);

//Insert Header Text:
biContext.setFont(font);
biContext.setColor(Color.white);
biContext.drawString(headerText, 21, 18);

//Display the average
biContext.setColor(Color.white);
biContext.drawString(averageText, 150, 18);


return biContext;
}
}
%>



  
  
   
   

     
   

     
   
  


  



                        function TempSave(ElementID)
                        {
                                CommentsPersistDiv.setAttribute("CommentContent",document.getElementById(ElementID).value);
                                CommentsPersistDiv.save("CommentXMLStore");
                        }
                        function Restore(ElementID)
                        {
                                CommentsPersistDiv.load("CommentXMLStore");
                                document.getElementById(ElementID).value=CommentsPersistDiv.getAttribute("CommentContent");
                        }
               
                  











源码下载：http://file.javaxxz.com/2014/10/1/070254156.zip