java动态生成图片 并把当前时间写在图片上
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servlet：
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package timeImage;
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics2D;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.sun.image.codec.jpeg.ImageFormatException;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGEncodeParam;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
@SuppressWarnings("serial")
public class CreateImageServlet extends HttpServlet {
?public void doGet(HttpServletRequest request, HttpServletResponse response)
???throws ServletException, IOException {
??response.setContentType("image/jpeg");
??createImage(response.getOutputStream());
?}
?@SuppressWarnings("unused")
?private void createImage(OutputStream out){
??SimpleDateFormat?? formatter?? =?? new?? SimpleDateFormat?? ("yyyy年MM月dd日?? HH:mm:ss???? ");?????
???? Date?? curDate?? =?? new?? Date(System.currentTimeMillis());//获取当前时间??
???? String s = "岱嘉："+formatter.format(curDate); //转化为字符串
???? Font font = new Font("Serif", Font.BOLD, 10); //设置字体 及大小
??int width = 250;? //图片的大小
??int height = 200;
??BufferedImage bi=new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);
??Graphics2D g=bi.createGraphics();
??g.setBackground(Color.green);
??g.clearRect(0, 0, width, height);
??g.setColor(Color.red);
??FontRenderContext context = g.getFontRenderContext();?
//??g.drawLine(0, 0, 99, 199);
??Rectangle2D bounds = font.getStringBounds(s, context);???
??????? double x = (width - bounds.getWidth()) / 2;???
??????? double y = (height - bounds.getHeight()) / 2;
??????? double ascent = -bounds.getY();???
??????? double baseY = y + ascent;???
??g.drawString(s, (int)x, (int)y);
??g.dispose();
??bi.flush();
??JPEGImageEncoder encoder=JPEGCodec.createJPEGEncoder(out);
??JPEGEncodeParam param=encoder.getDefaultJPEGEncodeParam(bi);
??param.setQuality(1, false);
??encoder.setJPEGEncodeParam(param);
??
??try {
???encoder.encode(bi);
??} catch (ImageFormatException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??} catch (IOException e) {
???// TODO Auto-generated catch block
???e.printStackTrace();
??}
?}
}
?
jsp：
<img alt="java动态生成图片 并把当前时间写在图片下" src="CreateImage" align="middle">
