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〔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，此方式可以自己修改**/ 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 "";} } /**从给的数字里得到准确的数字**/ 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（于页面风格相同），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> 返回类别: 教程 上一教程: 从Hibernate2到3移植的两点初体验 下一教程: 最简朴的java分页算法 您可以阅读与"JAVA：附加码生成器（图片）"相关的教程: · 怎样使用JAVA SERVLET动态生成图片详解 · 使用Java Servlet动态生成图片 · 将java代码生成html并且高亮显示 · 头文件生成器-JAVAH.EXE · Java Bean 生成器 |
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