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.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
public class ImageRandom extends HttpServlet {
/**
* Constructor of the object.
*/
public ImageRandom() {
super();
}
public void processRequest(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {
response.setContentType("image/jpeg");
response.setHeader("Pragma","No-cache");
response.setHeader("Cache-Control","no-cache");
response.setDateHeader("Expires", 0);
HttpSession session=request.getSession();
// 在内存中创建图象
int width=60, height=20;
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
// 获取图形上下文
Graphics graphics = image.getGraphics();
//生成随机类
Random random = new Random();
// 设定背景色
//graphics.setColor(this.getRandColor(100,150));
graphics.setColor(Color.gray);
graphics.clipRect(0, 0, width, height);
//设定字体
graphics.setFont(new Font("Times New Roman",Font.PLAIN,18));
//画边框
//graphics.setColor(new Color());
//graphics.drawRect(0,0,width-1,height-1);
// 随机产生50条干扰线，使图象中的认证码不易被其它程序探测到
graphics.setColor(getRandColor(100,200));
for (int i=0;i<50;i++) {
int x = ran
今天本来想熟悉一下J2SE的内容，不想在编写过程中突然考虑到一个问题，JAVA算法的效率，大家先看我自己写的一个小例子：
public class NumSort {
public static void mian (String args[]) {
int a[] = new int[args.length];
for (int i=0;i<args.length;i++) {
......
