〔Picture.java〕
package creator.common.attachLogin;
import java.io.*;
public class Picture{
final int key=1;
final String error_format_int= "format of color is not rgb.sample \"212|232|0\"";
final String error_color_input="format of color(num|num|num): num in 0-255";
/**格式化输出数据**/
public String manage(String temp){
String returnStr="";
temp = encrypt(temp);
byte[] by =temp.getBytes();
for(int i=0;i<by.length;i++){
returnStr=returnStr+(byte)by[i]+"|";
}
return returnStr;
}
/**格式化输入数据**/
public byte[] disManage(String temp){
int len=0,index=0,i=0,first=0;
while(( i=temp.indexOf("|",first))>-1){
len++;
first=i+1;
}
byte[] by=new byte[len];
first=0;
while(( i=temp.indexOf("|",first))>-1){
by[index]=Byte.parseByte(temp.substring(first,i));
index++;
first=i+1;
}
return by;
}
/**随机生成四位的附加码**/
public String getRandom(){
int i1 = (int)(java.lang.Math.random()*10);
int i2 = (int)(java.lang.Math.random()*10);
int i3 = (int)(java.lang.Math.random()*10);
int i4 = (int)(java.lang.Math.random()*10);
return String.valueOf(i1)+String.valueOf(i2)+String.valueOf(i3)+String.valueOf(i4);
}
/**加密1：错位处理**/
public String encrypt(String randomStr){
String para=random()+randomStr.substring(0,1)+random()+random()+randomStr.substring(1,2);
para= para+random()+randomStr.substring(2);
return jiaMi(para);
}
/**得到随机数0-9之间**/
private String random(){
String temp = String.valueOf((int)(java.lang.Math.random()*10));
return temp;
}
/**加密2：加密处理，此方法可以自己修改**/
private String jiaMi(String str){
byte[] by = str.getBytes();
ByteArrayInputStream in = new ByteArrayInputStream(by);
int ch;
int index=0;
byte[] temp = new byte[in.available()];
while((ch=in.read())!=-1){
temp[index]=(byte)(ch-key);
index++;
}
ByteArrayInputStream ins = new ByteArrayInputStream(temp);
BufferedReader fReader = new BufferedReader(new InputStreamReader(ins));
try{ return fReader.readLine();}catch(Exception e){return "";}
}
/**从给的数字里得到正确的数字**/
public String discrypt(String temp){
String para = jieMi(disManage(temp));
return para.substring(1,2)+para.substring(4,5)+ para.substring(6,8);
}
/**解密处理**/
private String jieMi(byte[] by){
ByteArrayInputStream in = new ByteArrayInputStream(by);
int ch;
int index=0;
byte[] temp = new byte[in.available()];
while((ch=in.read())!=-1){
temp[index]=(byte)(ch+key);
index++;
}
ByteArrayInputStream ins = new ByteArrayInputStream(temp);
BufferedReader fReader = new BufferedReader(new InputStreamReader(ins));
try{ return fReader.readLine();}catch(Exception e){return "";}
}
/**分解rgb格式的颜色 num|num|num**/
public int[] masterData(String temp){
int index_len=0,index=0,next_index=0;
int[] return_arr=new int[3];
boolean break_error=false;
if(getMax(temp,"|")==2){
while((index_len=temp.indexOf("|",next_index))>-1){
if(getInt(temp.substring(next_index,index_len))==256){
break_error = true;
}else{
return_arr[index]=getInt(temp.substring(next_index,index_len));
next_index=index_len+1;
index++;
}
if(break_error) break;
}
if(break_error){
return null;
}else{
return_arr[index] = getInt(temp.substring(next_index));
return return_arr;
}
}else{
System.out.println(error_format_int+":"+temp);
return null;
}
}
private int getMax(String temp,String temp2){
int index=0,index_len=0,index_next=0;
while((index=temp.indexOf(temp2,index_next))>-1){
index_len++;
index_next=index+1;
}
return index_len;
}
private int getInt(String temp){
try{
return Integer.parseInt(temp);
}catch(Exception e){
System.out.println(error_color_input+":"+temp);
return 256;
}
}
}
〔CreateImage.java〕
package creator.common.attachLogin;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.awt.*;
import java.awt.image.*;
import java.awt.image.BufferedImage;
import com.sun.image.codec.jpeg.*;
import com.sun.image.codec.jpeg.JPEGCodec;
public class CreateImage extends HttpServlet {
static final private String CONTENT_TYPE = "text/html; charset=gb2312";
final String input_back_color_error="input rgb backcolor is error";
final String input_fore_color_error="input rgb forecolor is error";
private Picture pic = new Picture();
//Initialize global variables
public void init() throws ServletException {
}
//Process the HTTP Get request
public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//生成图片
try{
int imageWidth = 60;
int imageHeight = 20;
BufferedImage image = new BufferedImage(imageWidth, imageHeight, BufferedImage.TYPE_INT_RGB);
Graphics graphics = image.getGraphics();
graphics.setColor(Color.white);
graphics.fillRect(0,0,imageWidth,imageHeight);
graphics.setColor(Color.white);
FileOutputStream fos = new FileOutputStream("attach.jpg?http://www.xvna.com");
BufferedOutputStream bos = new BufferedOutputStream(fos);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
encoder.encode(image);
bos.close();
}catch(Exception e){
System.out.println("生成图片出错！");
}
String queryNum = request.getParameter("Image");
String queryRgb="";
if(request.getParameter("Rgb")!=null){
queryRgb = request.getParameter("Rgb");
}
response.setHeader("Cache-Control","no-store");
response.setContentType("image/jpeg");
ServletOutputStream out=response.getOutputStream();
//jpg格式的背景色图片（于页面风格一样），宽3.6毫米，高1.8毫米
InputStream imageIn = new FileInputStream(new File("attach.jpg?http://www.xvna.com"));
JPEGImageDecoder decoder = JPEGCodec.createJPEGDecoder(imageIn);
BufferedImage image4 = decoder.decodeAsBufferedImage();
queryNum = pic.discrypt(queryNum);
Graphics g = image4.getGraphics();
if(queryRgb.length()>1){
if(pic.masterData(queryRgb)!=null){
int[] arg = pic.masterData(queryRgb);
g.setColor(new Color(arg[0],arg[1],arg[2]));
}
}else{
g.setColor(new Color(255,0,0));
}
g.drawString(queryNum,0,13);
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out);
encoder.encode(image4);
out.close();
}
}
〔web.xml〕
<servlet>
<servlet-name>CreateImage</servlet-name>
<servlet-class>javabean.com.CreateImage</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>CreateImage</servlet-name>
<url-pattern>/servlet/CreateImage</url-pattern>
</servlet-mapping>
〔index.jsp〕
<%@page contentType="text/html; charset=gb2312" %>
<%@page import="javabean.com.Picture"%>
<%
Picture pic = new Picture();
String random =pic.getRandom();
String encryRandom= pic.manage(random );
%>
<html>
<head>
<title>登陆窗口</title>
</head>
<body>
<div align="center">
<p align="center">附加码：<input type="attach" size="4">
<img align=absbottom vspace=2 border=0 src="servlet/CreateImage?Image=<%=encryRandom%>&Rgb=255|0|0" title="验证码图片"></p>
<input type="hidden" name="get_attach" value="<%=random%>">
</div>
</body>
</html>
