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package cn.itcast.response; import java.awt.Color; import java.awt.Font; import java.awt.Graphics; import java.awt.image.BufferedImage; import java.io.IOException; import java.io.PrintWriter; import java.util.Random; import javax.imageio.ImageIO; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class ResponseDemo5 extends HttpServlet { private int WIDTH = 120; private int HEIGHT = 25; public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { BufferedImage image = new BufferedImage(WIDTH , HEIGHT , BufferedImage.TYPE_INT_RGB); Graphics graphics = image.getGraphics(); //设置背景色 setBackgroundColor(graphics); //设置边框 setBorder(graphics); //绘制随机线 drawRandomLine(graphics); //绘制随机数字 drawRandomNum(graphics); response.setContentType("image/jpeg"); ImageIO.write(image, "jpg", response.getOutputStream()); } private void drawRandomNum(Graphics graphics) { // TODO Auto-generated method stub graphics.setColor(Color.RED); graphics.setFont(new Font("楷体", Font.BOLD, 20)); String base="\u96d5\u864e\u7684\u4e00\u4e86\u662f\u6211\u4e0d\u5728\u4eba\u4eec\u6709\u6765\u4ed6\u8fd9\u4e0a\u7740\u4e2a\u5730\u5230\u5927\u91cc\u8bf4\u5c31\u53bb\u5b50" + "\u5f97\u4e5f\u548c\u90a3\u8981\u4e0b\u770b\u5929\u65f6\u8fc7\u51fa\u5c0f\u4e48\u8d77\u4f60\u90fd\u628a\u597d\u8fd8\u591a\u6ca1\u4e3a\u53c8\u53ef\u5bb6\u5b66\u53ea" + "\u4ee5\u4e3b\u4f1a\u6837\u5e74\u60f3\u751f\u540c\u8001\u4e2d\u5341\u4ece\u81ea\u9762\u524d\u5934\u9053\u5b83\u540e\u7136\u8d70\u5f88\u50cf\u89c1\u4e24\u7528\u5979" + "\u56fd\u52a8\u8fdb\u6210\u56de\u4ec0\u8fb9\u4f5c\u5bf9\u5f00\u800c\u5df1\u4e9b\u73b0\u5c71\u6c11\u5019\u7ecf\u53d1\u5de5\u5411\u4e8b\u547d\u7ed9\u957f\u6c34\u51e0" + "\u4e49\u4e09\u58f0\u4e8e\u9ad8\u624b\u77e5\u7406\u773c\u5fd7\u70b9\u5fc3\u6218\u4e8c\u95ee\u4f46\u8eab\u65b9\u5b9e\u5403\u505a\u53eb"; int x = 10; for(int i = 0; i < 4; i++) { String str = base.charAt(new Random().nextInt(base.length())) + ""; graphics.drawString(str, x, 21); x += 28; } } private void drawRandomLine(Graphics graphics) { // TODO Auto-generated method stub graphics.setColor(Color.GREEN); for(int i = 0; i < 5; i++) { int x1 = new Random().nextInt(WIDTH); int y1 = new Random().nextInt(HEIGHT); int x2 = new Random().nextInt(WIDTH); int y2 = new Random().nextInt(HEIGHT); graphics.setColor(Color.GREEN); graphics.drawLine(x1, y1, x2, y2); } } private void setBorder(Graphics graphics) { // TODO Auto-generated method stub graphics.setColor(Color.BLACK); graphics.drawRect(0, 0, WIDTH, HEIGHT); } private void setBackgroundColor(Graphics graphics) { // TODO Auto-generated method stub graphics.setColor(Color.WHITE); graphics.fillRect(0, 0, WIDTH - 1, HEIGHT - 1); } }
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原文地址:http://www.cnblogs.com/mengfanrong/p/4283764.html