JAVA：附加码生成器（图片）

〔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"); 
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")); 

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>