根据pda传入矢量图的base64，还原成适量图

根据pda传入矢量图的base64，还原成适量图
package com.ibm.bgs.util;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;
import com.ibm.bgs.test.JeruGraphics;
import com.sun.image.codec.jpeg.JPEGCodec;
import com.sun.image.codec.jpeg.JPEGImageEncoder;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

public class Base64 {


private BufferedImage image; 

    /** 
     * 创建jpg文件到指定路径下 
     * @param path
     */  
    public void createJpg(String path)   {   
        try{   
            FileOutputStream   fos   =   new   FileOutputStream(path);   
            BufferedOutputStream   bos   =   new   BufferedOutputStream(fos);   
            JPEGImageEncoder   encoder   =   JPEGCodec.createJPEGEncoder(bos);   
            encoder.encode(image);   
            bos.close();     
        }catch(FileNotFoundException   fnfe)   {   
            System.out.println(fnfe);   
        }catch(IOException   ioe)   {   
            System.out.println(ioe);   
        }   
    } 
    
    /**
     * 根据矢量图的base64码生成byte，格式化标准：每位4个长度，为负正
     * @param strBase64 ：适量图坐标位的BASE64
     * @return
     */
    public String getByteFromBase64(String strBase64){
     //String strBase64="CQAAAHNpZ25hdHVyZfAAAACTAAAAAgAAAAoAAAAFAAAABAAAAAkAAAAGAAAADwAAAAsAAAATAAAADwAAABcAAAASAAAAGAAAABYAAAAaAAAAGgAAABsAAAAeAAAAGwAAACIAAAAbAAAAIgAAAAYAAADZAAAAegAAAN4AAAB8AAAA4gAAAIEAAADnAAAAhQAAAOoAAACJAAAA6gAAAIkAAAA=";
  BASE64Decoder based = new BASE64Decoder();
  String strByteReture = "";
   try {
    byte[] b =  based.decodeBuffer(strBase64);
    for (int j = 0; j < b.length; j++) {
     String strByte = Byte.toString(b[j]);
     if(!strByte.contains("-")){
      switch (strByte.length()) {
      case 1:
       strByte = "000"+strByte;break;
      case 2:
       strByte = "00"+strByte;break;
      case 3:
       strByte = "0"+strByte;break;
      }
     }else{
      int lessZore = Integer.parseInt(strByte);
      strByte = lessZore + 256+"";
      switch (strByte.length()) {
      case 1:
       strByte = "000"+strByte;break;
      case 2:
       strByte = "00"+strByte;break;
      case 3:
       strByte = "0"+strByte;break;
      }
     }
     strByteReture = strByteReture + strByte;
    }
   } catch (IOException e) {
    e.printStackTrace();
   }
     
     return strByteReture.trim();
    }
    
/**
  * 根据byte位生成矢量图，前13*4 位是验证码，
  * 17*4-13*4 位是宽度码
  * 21*4-17*4 位是高度码
  * 25*4-21*4 位是图片上线条数量 n
  * 29*4-25*4 位是各跳线由多少各点组成（x1，y1，x2，y2）
  * @param strImgPah
  * @param strByte
  */
    public void bulidBitImg(String strImgPah,String strByte){
     strByte = strByte.substring(13*4);//去掉验证码
     //宽
     String strWidth = strByte.substring(0,4);//0240 0000 0000 0000
     int width = Integer.parseInt(strWidth);//240
     strByte = strByte.substring(4*4);
     //高
     String strHeigth = strByte.substring(0,4);//0147 0000 0000 0000
     int height = Integer.parseInt(strHeigth);//147
     strByte = strByte.substring(4*4);
//     //线条数量
     String strLineCount = strByte.substring(0,4);//0002 0000 0000 0000
     int lineCount = Integer.parseInt(strLineCount);//2
     strByte = strByte.substring(4*4);
     image = new BufferedImage(width,height,BufferedImage.TYPE_INT_RGB);     
     Graphics g = image.getGraphics();   
     g.setColor(Color.yellow); 
     g.fillRect(0, 0, width, height); 
     g.setColor(Color.BLACK); 
     for (int n = 0; n < lineCount; n++) {
      String strFirstPointCount = strByte.substring(0,4);//0010 0000 0000 0000
         int firstPointCount = Integer.parseInt(strFirstPointCount);//10
         strByte = strByte.substring(4*4);
         //各条线上的点坐标位
         String strPoints = strByte.substring(0 , 4*8*firstPointCount);//两个点决定一个坐标
         strByte = strByte.substring(4*8*firstPointCount);
         List<Integer> firstPointList = new ArrayList<Integer>();
         for (int i = 0; i < strPoints.length(); i=i+4) {
          if((i+4) < strPoints.length()){
           String strFirstPoint = strPoints.substring(i, i+4);
           int intFirstPoint = Integer.parseInt(strFirstPoint);
           if(intFirstPoint > 0){
            firstPointList.add(intFirstPoint);
           }
          }
      }
         
         for (int k = 0; k < firstPointList.size(); k=k+4) {
             if(k+5 <= firstPointList.size()){
             g.drawLine(firstPointList.get(k), firstPointList.get(k+1), firstPointList.get(k+2), firstPointList.get(k+3));
                 g.drawLine(firstPointList.get(k+2), firstPointList.get(k+3), firstPointList.get(k+4), firstPointList.get(k+5)); 
             }
            } 
  }   
        createJpg(strImgPah);     
    }
    
/**
  * base64 to img
  * @param strBase64
  * @param strPath:ServletActionContext.getServletContext().getRealPath("/")/asd
  * @return
  */
public static boolean getImgFromBase64(String strBase64,String strPath){
  if(strBase64 == null)return false;
  BASE64Decoder based = new BASE64Decoder();
  try {
   byte[] b =  based.decodeBuffer(strBase64);
   //strPath = ServletActionContext.getServletContext().getRealPath("/")+"pda\\"+strPath;
   OutputStream out = new FileOutputStream(strPath); 
   out.write(b);
   out.flush();
   out.close();
  return true;
  } catch (IOException e) {
   e.printStackTrace();
   return false;
  }
}



/**
  * img to base64
  * @param strPath
  * @return
  */
public static String getBase64Img(String strPath){
  byte[] b =null;
  FileInputStream in =null;
  if(strPath == null) return null;
  try {
      in = new FileInputStream(strPath);
   b = new byte[in.available()];
   in.read(b);
   in.close();
  } catch (FileNotFoundException e) {
   e.printStackTrace();
  } catch (IOException e) {
   e.printStackTrace();
  }
  BASE64Encoder basee = new BASE64Encoder();
  return basee.encode(b);
}



/**
  * 
  * String to BASE64
  * @param str
  * @return
  */
public static String getBASE64Str(String str){
  String strBASE64Code = "" ;
  if(str == null) return null;
  BASE64Encoder base64 = new BASE64Encoder();
  strBASE64Code = base64.encode(str.getBytes());
  return strBASE64Code; 
}

/**
  * BASE64 to String
  * @param strBASE64
  * @return
  */
public static String getStrFromBASE64(String strBASE64){
  String strString = "" ;
  if(strBASE64 == null)return null;
  BASE64Decoder based = new BASE64Decoder();
  try {
   byte[] b = based.decodeBuffer(strBASE64);
   strString = new String(b);
   return strString;
  } catch (IOException e) {
   e.printStackTrace();
   return null;
  }
}


public static void main(String[] args) {  
  Base64 b = new Base64();
  String strBase64="CQAAAHNpZ25hdHVyZfAAAACTAAAAAgAAAAoAAAAFAAAABAAAAAkAAAAGAAAADwAAAAsAAAATAAAADwAAABcAAAASAAAAGAAAABYAAAAaAAAAGgAAABsAAAAeAAAAGwAAACIAAAAbAAAAIgAAAAYAAADZAAAAegAAAN4AAAB8AAAA4gAAAIEAAADnAAAAhQAAAOoAAACJAAAA6gAAAIkAAAA=";
  String strByte=b.getByteFromBase64(strBase64);
  String sPath="d:\\luojc.jpg";
  b.bulidBitImg(sPath,strByte);
   }