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import javax.imageio.ImageIO;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.font.FontRenderContext;
import java.awt.geom.Rectangle2D;
import java.awt.image.BufferedImage;
import java.awt.image.ImageConsumer;
import java.io.IOException;
import java.io.OutputStream;
import java.text.SimpleDateFormat;
import java.util.Date;
/**
* Created by lin on 2016-01-27-027.
*/
@WebServlet(name = "IPServlet", value = "/ip.png")
public class IPServlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置文件类型
response.setContentType("image/png");
//获取参数
String w = request.getParameter("w");
String h = request.getParameter("h");
String s = request.getParameter("s");
String c = request.getParameter("c");
int width = 300, height = 60, size = 18;
if (s != null) {
try {//使用try-catch块防止出错
size = Integer.parseInt(s);
} catch (Exception e) {
}
}
Font font = new Font("微软雅黑", Font.PLAIN, size);
BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
Graphics2D gd = img.createGraphics();
gd.setFont(font);
String ip = getIp(request);
//ip = "1234::1234::1234::1234::1234::1234::1234::1234";
Date date = new Date();
//Java String和Date的转换
//http://www.cnblogs.com/bmbm/archive/2011/12/06/2342264.html
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss (z) E");
String d = sdf.format(date);
String me = "Powered By Youth．霖";
double ipW = getWidth(font, ip, gd.getFontRenderContext()),
ipH = getHeight(font, ip, gd.getFontRenderContext()),
dateW = getWidth(font, d, gd.getFontRenderContext()),
dateH = getHeight(font, d, gd.getFontRenderContext()),
meW = getWidth(font, me, gd.getFontRenderContext()),
meH = getHeight(font, me, gd.getFontRenderContext());
width = (int) ipW;
if (dateW > width) width = (int) dateW;
if (meW > width) width = (int) meW;
width += 2;//留一点点边距
height = (int) (ipH + dateH + meH + 2);
if (w != null) {
width = Integer.parseInt(w);
}
if (h != null) {
height = Integer.parseInt(h);
}
//Java生成透明背景图片
//http://snkcxy.iteye.com/blog/1872229
img = gd.getDeviceConfiguration().createCompatibleImage(width, height, Transparency.TRANSLUCENT);
gd = img.createGraphics();
gd.setFont(font);
//随机颜色
Color color = new Color(
(new Double(Math.random() * 128)).intValue() + 128,
(new Double(Math.random() * 128)).intValue() + 128,
(new Double(Math.random() * 128)).intValue() + 128);
if (c != null) {
try {
//Java中颜色的String和Color对象之间的互相转换
//http://winhack.iteye.com/blog/1843781
color = new Color(Integer.parseInt(c, 16));
} catch (Exception e) {
}
}
gd.setColor(color);
//画矩形框
gd.drawRect(0, 0, width - 1, height - 1);
//画字符串drawString(string,x,y)
//左起x像素,从上往下y像素这个(x,y)是字符串的左下角坐标(不是左上角)
gd.drawString(d, (float) ((width - dateW) / 2), (float) (height / 3));
gd.drawString(ip, (float) ((width - ipW) / 2), (float) (height / 3 * 2));
gd.drawString(me, (float) (width - meW) / 2, (float) (height - 3));
ImageIO.write(img, "png", response.getOutputStream());
}
/**
* //计算字符串的像素长度与高度
* //http://blog.chinaunix.net/uid-79084-id-97205.html
* Graphics2D g = (Graphics2D)Toolkit.getDefaultToolkit().getImage("imgname").getGraphics();
* //设置大字体
* Font font = new Font("楷体", Font.ITALIC | Font.BOLD, 72);
* g.setFont(font);
* FontRenderContext context = g.getFontRenderContext();
* //获取字体的像素范围对象
* Rectangle2D stringBounds = font.getStringBounds("text", context);
* double fontWidth = stringBounds.getWidth();
*/
private double getWidth(Font f, String str, FontRenderContext context) {
return f.getStringBounds(str, context).getWidth();
}
private double getHeight(Font f, String s, FontRenderContext c) {
return f.getStringBounds(s, c).getHeight();
}
//JSP 获取真实IP地址的代码
//http://www.jb51.net/article/21272.htm
public static String getIp(HttpServletRequest request) {
String ip = request.getHeader("x-forwarded-for");
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getHeader("WL-Proxy-Client-IP");
}
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
ip = request.getRemoteAddr();
}
return ip;
}
}
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