amcharts java另存圖（servlet）

最後更新：2018-12-04 來源：互聯網

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package servlet;

import java.awt.Graphics2D;
import java.awt.RenderingHints;
import java.awt.image.BufferedImage;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

/**
* 這個Servlet處理圖表頁面傳來的匯出圖片請求
*
* @author 廖瀚卿
*
*/
@SuppressWarnings("serial")
public class ExportImage extends HttpServlet {

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

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // 頁面flash的寬度和高度
        int width = Integer.parseInt(request.getParameter("width"));
        int height = Integer.parseInt(request.getParameter("height"));

        BufferedImage result = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        // 頁面是將一個個像素作為參數傳遞進來的,所以如果圖表越大,處理時間越長
        for (int y = 0; y < height; y++) {
            int x = 0;
            String[] row = request.getParameter("r" + y).split(",");
            for (int c = 0; c < row.length; c++) {
                String[] pixel = row[c].split(":"); // 十六進位顏色數組
                int repeat = pixel.length > 1 ? Integer.parseInt(pixel[1]) : 1;
                for (int l = 0; l < repeat; l++) {
                    result.setRGB(x, y, Integer.parseInt(pixel[0], 16));
                    x++;
                }
            }
        }
        response.setContentType("image/jpeg");
        response.addHeader("Content-Disposition",
                "attachment; filename=/"amchart.jpg/"");
        Graphics2D g = result.createGraphics();
        // 處理圖形平滑度
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g.drawImage(result, 0, 0, width, height, null);
        g.dispose();

        ServletOutputStream f = response.getOutputStream();
        JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(f);
        JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(result);
        param.setQuality((float) (100 / 100.0), true);// 設定圖片品質,100最大,預設70
        encoder.encode(result, param);
        ImageIO.write(result, "JPEG", response.getOutputStream());// 輸出圖片
        f.close();
    }


    public static void main(String[] a){
    System.out.println("aaa");
    }
}

//--------------------------------------------------------------------------------------------

//------------頁面代碼--------------------------------------------------------------------

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" />
<title>ampie</title>

<body>


<script type="text/javascript" src="../ampie/swfobject.js"></script>
<div id="flashcontent">
<strong>You need to upgrade your Flash Player</strong>
</div>

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amcharts java另存圖（servlet）

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