java

response.setheader(“pragma”,”no-cache”);
response.setheader(“cache-control”,”no-cache”);
response.setdateheader(“expires”, 0);
/*
* Created on 2005-5-26
*
* TODO To change the template for this generated file go to
* Window – Preferences – Java – Code Style – Code Templates
*/
package com.test;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.image.*;
import com.sun.image.codec.jpeg.*;
/**
*

Title:通用web控件

*

Description: 生成随机验证码

*

Copyright: Copyright (c) 2003

*

Company:

* @author tomzc
* @version 1.0
*/
public class AuthenCode
   extends HttpServlet {
 private static final String CONTENT_TYPE = “image/jpeg”; // 输出的文件格式是jpeg ,关于HTTP输出类型的定义可参考相关文档说明
 private static final int WIDTH = 40;
 private static final int HEIGHT = 18;
 private static final int LENGTH = 4;
 public static final String SESSION_AUTHEN_CODE = “session_authen_code”;  //设置保存的session对象,用户用户提交时进行匹配的操作。
 //Initialize global variables
 public void init() throws ServletException {
 }
 //Process the HTTP Get request
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws
     ServletException, IOException {
   response.setContentType(CONTENT_TYPE);  //定义输出的文件格式。
   OutputStream out = response.getOutputStream();
   int width = WIDTH;
   int height = HEIGHT;
   int length = LENGTH;
   String sessionName = request.getParameter(“authenName”);
   if (sessionName == null) {
     sessionName = SESSION_AUTHEN_CODE;
   }
   try {
     width = Integer.parseInt(request.getParameter(“width”));
   }
   catch (Exception ex) {
     width = WIDTH;
   }
   try {
     height = Integer.parseInt(request.getParameter(“heigth”));
   }
   catch (Exception ex) {
     height = HEIGHT;
   }
   try {
     length = Integer.parseInt(request.getParameter(“length”));
   }
   catch (Exception ex) {
     length = LENGTH;
   }
   //取得随机整数
   Random ran = new Random(System.currentTimeMillis());
   //取除第一位后的指定几位
   String seed = (ran.nextInt() + “”).substring(1, 1 + length);
   //将取得的保存在session中
   request.getSession().setAttribute(sessionName, seed);
   //生成缓冲图象
   BufferedImage image = new BufferedImage(width, height,
                                           BufferedImage.TYPE_INT_RGB);
   //取得绘图对象
   Graphics g = image.getGraphics();
   g.setColor(new Color(245, 245, 245));
   //填充背景色
   g.fillRect(0, 0, width, height);
   //设置字体颜色
   g.setColor(Color.DARK_GRAY);
   //设置字体样式
   g.setFont(new Font(“Arial”, Font.BOLD, 12));
   //写入指定文字
   g.drawString(seed, 4, 13);
   g.dispose();
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
   encoder.encode(image);
   out.close();
 }
 //Clean up resources
 public void destroy() {
 }
1   package util;
2  
3   import javax.imageio.ImageIO;
4   import javax.servlet.ServletException;
5   import javax.servlet.http.HttpServlet;
6   import javax.servlet.http.HttpServletRequest;
7   import javax.servlet.http.HttpServletResponse;
8   import java.awt.*;
9   import java.awt.image.BufferedImage;
10  import java.io.IOException;
11  import java.util.Random;
12  
13  
14  /**
15   * 描述:
16   *
17   * @author $author$
18   * @version $Revision$
19   */
20  public class PicCheckCode extends HttpServlet {
21  
22      private Font mFont     = new Font(“Arial Black”, Font.PLAIN, 15); //设置字体
23      private int  lineWidth = 2; //干扰线的长度=1.414*lineWidth
24      private int  width     = 60; //定义图形大小
25      private int  height    = 20; //定义图形大小
26      private int  count     = 200;
27  
28      /**
29       * 描述:
30       *
31       * @param fc 描述:
32       * @param bc 描述:
33       *
34       * @return 描述:
35       */
36      private Color getRandColor(int fc, int bc) { //取得给定范围随机颜色
37  
38          Random random = new Random();
39  
40          if (fc > 255) {
41  
42              fc = 255;
43          }
44  
45          if (bc > 255) {
46  
47              bc = 255;
48          }
49  
50          int r = fc + random.nextInt (bc – fc);
51          int g = fc + random.nextInt (bc – fc);
52          int b = fc + random.nextInt (bc – fc);
53  
54          return new Color(r, g, b);
55      }
56  
57      //处理post
58      public void doPost(HttpServletRequest request, HttpServletResponse response)
59          throws ServletException, IOException {
60  
61          doGet (request, response);
62      }
63  
64      /**
65       * 描述:
66       *
67       * @param request 描述:
68       * @param response 描述:
69       *
70       * @throws ServletException 描述:
71       * @throws IOException 描述:
72       */
73      public void doGet(HttpServletRequest request, HttpServletResponse response)
74          throws ServletException, IOException {
75  
76          //response.reset();
77          //设置页面不缓存
78          response.setHeader (“Pragma”, “No-cache”);
79          response.setHeader (“Cache-Control”, “no-cache”);
80          response.setDateHeader (“Expires”, 0);
81          response.setContentType (“image/gif”);
82  
83          // 在内存中创建图象
84          BufferedImage image = new BufferedImage(width, height,
85                  BufferedImage.TYPE_INT_RGB);
86  
87          // 获取图形上下文
88          Graphics2D g = (Graphics2D) image.getGraphics ();
89  
90          //生成随机类
91          Random random = new Random();
92  
93          // 设定背景色
94          g.setColor (getRandColor (200, 250)); //—1
95  
96          g.fillRect (0, 0, width, height);
97  
98          //设定字体
99          g.setFont (mFont);
100
101         //画边框
102         g.setColor (getRandColor (0, 20)); //—2
103         g.drawRect (0, 0, width – 1, height – 1);
104
105         //随机产生干扰线,使图象中的认证码不易被其它程序探测到
106         for (int i = 0; i < count; i++) {
107
108             g.setColor (getRandColor (150, 200)); //—3
109
110             int x  = random.nextInt (width – lineWidth – 1) +
/*
* Created on 2005-5-26
*
* TODO To change the template for this generated file go to
* Window – Preferences – Java – Code Style – Code Templates
*/
package com.test;

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.image.*;
import com.sun.image.codec.jpeg.*;
/**
*

Title:通用web控件

*

Description: 生成随机验证码

*

Copyright: Copyright (c) 2003

*

Company:

* @author tomzc
* @version 1.0
*/
public class AuthenCode
   extends HttpServlet {
 private static final String CONTENT_TYPE = “image/jpeg”; // 输出的文件格式是jpeg ,关于HTTP输出类型的定义可参考相关文档说明
 private static final int WIDTH = 40;
 private static final int HEIGHT = 18;
 private static final int LENGTH = 4;
 public static final String SESSION_AUTHEN_CODE = “session_authen_code”;  //设置保存的session对象,用户用户提交时进行匹配的操作。
 //Initialize global variables
 public void init() throws ServletException {
 }
 //Process the HTTP Get request
 public void doGet(HttpServletRequest request, HttpServletResponse response) throws
     ServletException, IOException {
   response.setContentType(CONTENT_TYPE);  //定义输出的文件格式。
   OutputStream out = response.getOutputStream();
   int width = WIDTH;
   int height = HEIGHT;
   int length = LENGTH;
   String sessionName = request.getParameter(“authenName”);
   if (sessionName == null) {
     sessionName = SESSION_AUTHEN_CODE;
   }
   try {
     width = Integer.parseInt(request.getParameter(“width”));
   }
   catch (Exception ex) {
     width = WIDTH;
   }
   try {
     height = Integer.parseInt(request.getParameter(“heigth”));
   }
   catch (Exception ex) {
     height = HEIGHT;
   }
   try {
     length = Integer.parseInt(request.getParameter(“length”));
   }
   catch (Exception ex) {
     length = LENGTH;
   }
   //取得随机整数
   Random ran = new Random(System.currentTimeMillis());
   //取除第一位后的指定几位
   String seed = (ran.nextInt() + “”).substring(1, 1 + length);
   //将取得的保存在session中
   request.getSession().setAttribute(sessionName, seed);
   //生成缓冲图象
   BufferedImage image = new BufferedImage(width, height,
                                           BufferedImage.TYPE_INT_RGB);
   //取得绘图对象
   Graphics g = image.getGraphics();
   g.setColor(new Color(245, 245, 245));
   //填充背景色
   g.fillRect(0, 0, width, height);
   //设置字体颜色
   g.setColor(Color.DARK_GRAY);
   //设置字体样式
   g.setFont(new Font(“Arial”, Font.BOLD, 12));
   //写入指定文字
   g.drawString(seed, 4, 13);
   g.dispose();
   JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
   encoder.encode(image);
   out.close();
 }
 //Clean up resources
 public void destroy() {
 }
}
 <%@ page contentType="image/jpeg" import="java.awt.*,java.awt.image.*,java.util.*,javax.imageio.*" %>
  <%!
  //create by smallnest
  //email: smallnest@gmail.com
  //website:www.kuaff.com
  
  //生成随机颜色
  Color getRandColor(Random random,int fc,int bc)
  {
  if(fc>255) fc=255;
  if(bc>255) bc=255;
  int r=fc+random.nextInt(bc-fc);
  int g=fc+random.nextInt(bc-fc);
  int b=fc+random.nextInt(bc-fc);
  return new Color(r,g,b);
  }
  %>
  <%
  //设置页面不缓存
  response.setHeader(“Pragma”,”No-cache”);
  response.setHeader(“Cache-Control”,”no-cache”);
  response.setDateHeader(“Expires”, 0);
  
  // 设置图片的长宽
  int width=176, height=30;
  //设置备选汉字,剔除一些不雅的汉字
  String base = “\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\u5f53\u4f4f\u542c\u9769\u6253\u5462\u771f\u5168\u624d\u56db\u5df2\u6240\u654c\u4e4b\u6700\u5149\u4ea7\u60c5\u8def\u5206\u603b\u6761\u767d\u8bdd\u4e1c\u5e2d\u6b21\u4eb2\u5982\u88ab\u82b1\u53e3\u653e\u513f\u5e38\u6c14\u4e94\u7b2c\u4f7f\u5199\u519b\u5427\u6587\u8fd0\u518d\u679c\u600e\u5b9a\u8bb8\u5feb\u660e\u884c\u56e0\u522b\u98de\u5916\u6811\u7269\u6d3b\u90e8\u95e8\u65e0\u5f80\u8239\u671b\u65b0\u5e26\u961f\u5148\u529b\u5b8c\u5374\u7ad9\u4ee3\u5458\u673a\u66f4\u4e5d\u60a8\u6bcf\u98ce\u7ea7\u8ddf\u7b11\u554a\u5b69\u4e07\u5c11\u76f4\u610f\u591c\u6bd4\u9636\u8fde\u8f66\u91cd\u4fbf\u6597\u9a6c\u54ea\u5316\u592a\u6307\u53d8\u793e\u4f3c\u58eb\u8005\u5e72\u77f3\u6ee1\u65e5\u51b3\u767e\u539f\u62ff\u7fa4\u7a76\u5404\u516d\u672c\u601d\u89e3\u7acb\u6cb3\u6751\u516b\u96be\u65e9\u8bba\u5417\u6839\u5171\u8ba9\u76f8\u7814\u4eca\u5176\u4e66\u5750\u63a5\u5e94\u5173\u4fe1\u89c9\u6b65\u53cd\u5904\u8bb0\u5c06\u5343\u627e\u4e89\u9886\u6216\u5e08\u7ed3\u5757\u8dd1\u8c01\u8349\u8d8a\u5b57\u52a0\u811a\u7d27\u7231\u7b49\u4e60\u9635\u6015\u6708\u9752\u534a\u706b\u6cd5\u9898\u5efa\u8d76\u4f4d\u5531\u6d77\u4e03\u5973\u4efb\u4ef6\u611f\u51c6\u5f20\u56e2\u5c4b\u79bb\u8272\u8138\u7247\u79d1\u5012\u775b\u5229\u4e16\u521a\u4e14\u7531\u9001\u5207\u661f\u5bfc\u665a\u8868\u591f\u6574\u8ba4\u54cd\u96ea\u6d41\u672a\u573a\u8be5\u5e76\u5e95\u6df1\u523b\u5e73\u4f1f\u5fd9\u63d0\u786e\u8fd1\u4eae\u8f7b\u8bb2\u519c\u53e4\u9ed1\u544a\u754c\u62c9\u540d\u5440\u571f\u6e05\u9633\u7167\u529e\u53f2\u6539\u5386\u8f6c\u753b\u9020\u5634\u6b64\u6cbb\u5317\u5fc5\u670d\u96e8\u7a7f\u5185\u8bc6\u9a8c\u4f20\u4e1a\u83dc\u722c\u7761\u5174\u5f62\u91cf\u54b1\u89c2\u82e6\u4f53\u4f17\u901a\u51b2\u5408\u7834\u53cb\u5ea6\u672f\u996d\u516c\u65c1\u623f\u6781\u5357\u67aa\u8bfb\u6c99\u5c81\u7ebf\u91ce\u575a\u7a7a\u6536\u7b97\u81f3\u653f\u57ce\u52b3\u843d\u94b1\u7279\u56f4\u5f1f\u80dc\u6559\u70ed\u5c55\u5305\u6b4c\u7c7b\u6e10\u5f3a\u6570\u4e61\u547c\u6027\u97f3\u7b54\u54e5\u9645\u65e7\u795e\u5ea7\u7ae0\u5e2e\u5566\u53d7\u7cfb\u4ee4\u8df3\u975e\u4f55\u725b\u53d6\u5165\u5cb8\u6562\u6389\u5ffd\u79cd\u88c5\u9876\u6025\u6797\u505c\u606f\u53e5\u533a\u8863\u822c\u62a5\u53f6\u538b\u6162\u53d4\u80cc\u7ec6”;
  //备选汉字的长度
  int length = base.length();
  
  //创建内存图像
  BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
  // 获取图形上下文
  Graphics g = image.getGraphics();
  
  //创建随机类的实例
  Random random = new Random();
  
  // 设定图像背景色(因为是做背景,所以偏淡)
  g.setColor(getRandColor(random,200,250));
  g.fillRect(0, 0, width, height);
  
  //备选字体
  String[] fontTypes = {“\u5b8b\u4f53″,”\u65b0\u5b8b\u4f53″,”\u9ed1\u4f53″,”\u6977\u4f53″,”\u96b6\u4e66”};
  int fontTypesLength = fontTypes.length;
  
  //在图片背景上增加噪点
  g.setColor(getRandColor(random,160,200));
  g.setFont(new Font(“Times New Roman”,Font.PLAIN,14));
  for (int i=0;i<6;i++)
  {
  g.drawString(“*********************************************”,0,5*(i+2));
  }
  
  //取随机产生的认证码(6个汉字)
  
  //保存生成的汉字字符串
  String sRand=””;
  for (int i=0;i<6;i++)
  {
  int start = random.nextInt(length);
  String rand=base.substring(start,start+1);
  sRand+=rand;
  
  //设置字体的颜色
  g.setColor(getRandColor(random,10,150));
  //设置字体
  g.setFont(new Font(fontTypes[random.nextInt(fontTypesLength)],Font.BOLD,18 + random.nextInt(6)));
  //将此汉字画到图片上
  g.drawString(rand,24*i+ 10 + random.nextInt(8),24);
  }
  
  //将认证码存入session
  session.setAttribute(“rand”,sRand);
  
  g.dispose();
  
  //输出图象到页面
  ImageIO.write(image, “JPEG”, response.getOutputStream());
  
  %>
==================================================================
/*
* created on 2004-8-4
*
* to change the template for this generated file go to
* window>preferences>java>code generation>code and comments
*/
package myclass.test;

import java.awt.*;
import java.awt.image.*;
import java.util.*;

/**
* @author
*
* to change the template for this generated type comment go to
* window>preferences>java>code generation>code and comments
*/
public class image {

public string srand=””;

public color getrandcolor(int fc,int bc){//给定范围获得随机颜色
random random = new random();
if(fc>255) fc=255;
if(bc>255) bc=255;
int r=fc+random.nextint(bc-fc);
int g=fc+random.nextint(bc-fc);
int b=fc+random.nextint(bc-fc);
return new color(r,g,b);
}
public bufferedimage creatimage(){

// 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 g = image.getgraphics();

//生成随机类
random random = new random();

// 设定背景色
g.setcolor(getrandcolor(200,250));
g.fillrect(0, 0, width, height);

//设定字体
g.setfont(new font(“times new roman”,font.plain,18));

//画边框
//g.setcolor(new color());
//g.drawrect(0,0,width-1,height-1);

// 随机产生155条干扰线,使图象中的认证码不易被其它程序探测到
g.setcolor(getrandcolor(160,200));
for (int i=0;i<155;i++)
{
int x = random.nextint(width);
int y = random.nextint(height);
int xl = random.nextint(12);
int yl = random.nextint(12);
g.drawline(x,y,x+xl,y+yl);
}

// 取随机产生的认证码(4位数字)
//string rand = request.getparameter(“rand”);
//rand = rand.substring(0,rand.indexof(“.”));

for (int i=0;i<4;i++){
string rand=string.valueof(random.nextint(10));
srand+=rand;
// 将认证码显示到图象中
g.setcolor(new color(20+random.nextint(110),20+random.nextint(110),20+random.nextint(110)));//调用函数出来的颜色相同,可能是因为种子太接近,所以只能直接生成
g.drawstring(rand,13*i+6,16);
}
// 图象生效
g.dispose();
return image;
}
}
======================================================================
image.jsp(对bean的引用)

<%@ page contenttype="image/jpeg" import="javax.imageio.*" %>

<%
//设置页面不缓存
response.setheader(“pragma”,”no-cache”);
response.setheader(“cache-control”,”no-cache”);
response.setdateheader(“expires”, 0);

// 将认证码存入session
session.setattribute(“rand”,image.srand);

// 输出图象到页面
imageio.write(image.creatimage(), “jpeg”, response.getoutputstream());

%>

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