package com.xgt.util; import java.io.*; public class VideoEncodeUtil {
</span><span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span> main(String[] args) <span style="color: rgba(0, 0, 255, 1)">throws</span><span style="color: rgba(0, 0, 0, 1)"> Exception { encrypt(</span>"D:\py交易\11.mp4","fuckyourself"<span style="color: rgba(0, 0, 0, 1)">); decrypt(</span>"D:\py交易\11.mp4","D:\py交易\22.mp4",4<span style="color: rgba(0, 0, 0, 1)">); System.out.println(readFileLastByte(</span>"D:\py交易\11.mp4",12<span style="color: rgba(0, 0, 0, 1)">)); } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * 文件file进行加密 * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> fileUrl 文件路径 * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> key 密码 * </span><span style="color: rgba(128, 128, 128, 1)">@throws</span><span style="color: rgba(0, 128, 0, 1)"> Exception </span><span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span> encrypt(String fileUrl, String key) <span style="color: rgba(0, 0, 255, 1)">throws</span><span style="color: rgba(0, 0, 0, 1)"> Exception { File file </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> File(fileUrl); String path </span>=<span style="color: rgba(0, 0, 0, 1)"> file.getPath(); </span><span style="color: rgba(0, 0, 255, 1)">if</span>(!<span style="color: rgba(0, 0, 0, 1)">file.exists()){ </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)">; } </span><span style="color: rgba(0, 0, 255, 1)">int</span> index = path.lastIndexOf("\"<span style="color: rgba(0, 0, 0, 1)">); String destFile </span>= path.substring(0, index)+"\"+"abc"<span style="color: rgba(0, 0, 0, 1)">; File dest </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> File(destFile); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">获取待加密文件的输入流</span> InputStream in = <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> FileInputStream(fileUrl); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">创建中转文件输出流</span> OutputStream out = <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> FileOutputStream(destFile); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">待加密文件的流</span> <span style="color: rgba(0, 0, 255, 1)">byte</span>[] buffer = <span style="color: rgba(0, 0, 255, 1)">new</span> <span style="color: rgba(0, 0, 255, 1)">byte</span>[1024<span style="color: rgba(0, 0, 0, 1)">]; </span><span style="color: rgba(0, 0, 255, 1)">int</span><span style="color: rgba(0, 0, 0, 1)"> r; </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">加密之后的文件的流</span> <span style="color: rgba(0, 0, 255, 1)">byte</span>[] buffer2=<span style="color: rgba(0, 0, 255, 1)">new</span> <span style="color: rgba(0, 0, 255, 1)">byte</span>[1024<span style="color: rgba(0, 0, 0, 1)">]; </span><span style="color: rgba(0, 0, 255, 1)">while</span> (( r= in.read(buffer)) > 0<span style="color: rgba(0, 0, 0, 1)">) { </span><span style="color: rgba(0, 0, 255, 1)">for</span>(<span style="color: rgba(0, 0, 255, 1)">int</span> i=0;i<r;i++<span style="color: rgba(0, 0, 0, 1)">) { </span><span style="color: rgba(0, 0, 255, 1)">byte</span> b=<span style="color: rgba(0, 0, 0, 1)">buffer[i]; </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">buffer2[i]=b==255?0:++b; </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">每个字节加2加密</span> b+=2<span style="color: rgba(0, 0, 0, 1)">; buffer2[i] </span>=<span style="color: rgba(0, 0, 0, 1)"> b; } out.write(buffer2, </span>0<span style="color: rgba(0, 0, 0, 1)">, r); out.flush(); } in.close(); out.close(); file.delete(); dest.renameTo(</span><span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> File(fileUrl)); appendMethodA(fileUrl, key); System.out.println(</span>"加密成功"<span style="color: rgba(0, 0, 0, 1)">); } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> fileName * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> content 密钥 </span><span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> <span style="color: rgba(0, 0, 255, 1)">void</span><span style="color: rgba(0, 0, 0, 1)"> appendMethodA(String fileName, String content) { </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 打开一个随机访问文件流，按读写方式</span> RandomAccessFile randomFile = <span style="color: rgba(0, 0, 255, 1)">new</span> RandomAccessFile(fileName, "rw"<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 文件长度，字节数</span> <span style="color: rgba(0, 0, 255, 1)">long</span> fileLength =<span style="color: rgba(0, 0, 0, 1)"> randomFile.length(); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">将写文件指针移到文件尾。</span> randomFile.seek(fileLength);
randomFile.writeBytes(content); randomFile.close(); } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (IOException e) { e.printStackTrace(); } } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * 解密 * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> fileUrl 源文件 * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> tempUrl 临时文件 * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> keyLength 密码长度 * </span><span style="color: rgba(128, 128, 128, 1)">@return</span><span style="color: rgba(0, 128, 0, 1)"> * </span><span style="color: rgba(128, 128, 128, 1)">@throws</span><span style="color: rgba(0, 128, 0, 1)"> Exception </span><span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> String decrypt(String fileUrl, String tempUrl, <span style="color: rgba(0, 0, 255, 1)">int</span> keyLength) <span style="color: rgba(0, 0, 255, 1)">throws</span><span style="color: rgba(0, 0, 0, 1)"> Exception{ File file </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> File(fileUrl); </span><span style="color: rgba(0, 0, 255, 1)">if</span> (!<span style="color: rgba(0, 0, 0, 1)">file.exists()) { </span><span style="color: rgba(0, 0, 255, 1)">return</span> <span style="color: rgba(0, 0, 255, 1)">null</span><span style="color: rgba(0, 0, 0, 1)">; } File dest </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> File(tempUrl); </span><span style="color: rgba(0, 0, 255, 1)">if</span> (!<span style="color: rgba(0, 0, 0, 1)">dest.getParentFile().exists()) { dest.getParentFile().mkdirs(); } </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">获取待解密的文件输入流</span> InputStream is = <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> FileInputStream(fileUrl); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">创建目标文件输出流，用来生成解密后的文件</span> OutputStream out = <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> FileOutputStream(tempUrl); </span><span style="color: rgba(0, 0, 255, 1)">byte</span>[] buffer = <span style="color: rgba(0, 0, 255, 1)">new</span> <span style="color: rgba(0, 0, 255, 1)">byte</span>[1024<span style="color: rgba(0, 0, 0, 1)">]; </span><span style="color: rgba(0, 0, 255, 1)">byte</span>[] buffer2=<span style="color: rgba(0, 0, 255, 1)">new</span> <span style="color: rgba(0, 0, 255, 1)">byte</span>[1024<span style="color: rgba(0, 0, 0, 1)">]; </span><span style="color: rgba(0, 0, 255, 1)">byte</span> bMax=(<span style="color: rgba(0, 0, 255, 1)">byte</span>)255<span style="color: rgba(0, 0, 0, 1)">; </span><span style="color: rgba(0, 0, 255, 1)">long</span> size = file.length() -<span style="color: rgba(0, 0, 0, 1)"> keyLength; </span><span style="color: rgba(0, 0, 255, 1)">int</span> mod = (<span style="color: rgba(0, 0, 255, 1)">int</span>) (size%1024<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 0, 255, 1)">int</span> div = (<span style="color: rgba(0, 0, 255, 1)">int</span>) (size>>10<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 0, 255, 1)">int</span> count = mod==0?div:(div+1<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 0, 255, 1)">int</span> k = 1<span style="color: rgba(0, 0, 0, 1)">, r; </span><span style="color: rgba(0, 0, 255, 1)">while</span> ((k <= count && ( r = is.read(buffer)) > 0<span style="color: rgba(0, 0, 0, 1)">)) { </span><span style="color: rgba(0, 0, 255, 1)">if</span>(mod != 0 && k==<span style="color: rgba(0, 0, 0, 1)">count) { r </span>=<span style="color: rgba(0, 0, 0, 1)"> mod; } </span><span style="color: rgba(0, 0, 255, 1)">for</span>(<span style="color: rgba(0, 0, 255, 1)">int</span> i = 0;i < r;i++<span style="color: rgba(0, 0, 0, 1)">) { </span><span style="color: rgba(0, 0, 255, 1)">byte</span> b=<span style="color: rgba(0, 0, 0, 1)">buffer[i]; </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">buffer2[i]=b==0?bMax:--b; </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">每个字节减2解码</span> b-=2<span style="color: rgba(0, 0, 0, 1)">; buffer2[i] </span>=<span style="color: rgba(0, 0, 0, 1)"> b; } out.write(buffer2, </span>0<span style="color: rgba(0, 0, 0, 1)">, r); k</span>++<span style="color: rgba(0, 0, 0, 1)">; } out.close(); is.close(); </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> tempUrl; } </span><span style="color: rgba(0, 128, 0, 1)">/</span><span style="color: rgba(0, 128, 0, 1)"> * 判断文件是否加密 * </span><span style="color: rgba(128, 128, 128, 1)">@param</span><span style="color: rgba(0, 128, 0, 1)"> fileName * </span><span style="color: rgba(128, 128, 128, 1)">@return</span><span style="color: rgba(0, 128, 0, 1)"> * * 加密成功返回key * 加密失败返回非key的字符串 </span><span style="color: rgba(0, 128, 0, 1)">*/</span> <span style="color: rgba(0, 0, 255, 1)">public</span> <span style="color: rgba(0, 0, 255, 1)">static</span> String readFileLastByte(String fileName, <span style="color: rgba(0, 0, 255, 1)">int</span><span style="color: rgba(0, 0, 0, 1)"> keyLength) { File file </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> File(fileName); </span><span style="color: rgba(0, 0, 255, 1)">if</span>(!file.exists())<span style="color: rgba(0, 0, 255, 1)">return</span> "没有文件"<span style="color: rgba(0, 0, 0, 1)">; StringBuffer str </span>= <span style="color: rgba(0, 0, 255, 1)">new</span><span style="color: rgba(0, 0, 0, 1)"> StringBuffer(); </span><span style="color: rgba(0, 0, 255, 1)">try</span><span style="color: rgba(0, 0, 0, 1)"> { </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 打开一个随机访问文件流，按读写方式</span> RandomAccessFile randomFile = <span style="color: rgba(0, 0, 255, 1)">new</span> RandomAccessFile(fileName, "rw"<span style="color: rgba(0, 0, 0, 1)">); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)"> 文件长度，字节数</span> <span style="color: rgba(0, 0, 255, 1)">long</span> fileLength =<span style="color: rgba(0, 0, 0, 1)"> randomFile.length(); </span><span style="color: rgba(0, 128, 0, 1)">//</span><span style="color: rgba(0, 128, 0, 1)">将写文件指针移到文件尾。</span> <span style="color: rgba(0, 0, 255, 1)">for</span>(<span style="color: rgba(0, 0, 255, 1)">int</span> i = keyLength ; i>=1 ; i--<span style="color: rgba(0, 0, 0, 1)">){ randomFile.seek(fileLength</span>-<span style="color: rgba(0, 0, 0, 1)">i); str.append((</span><span style="color: rgba(0, 0, 255, 1)">char</span><span style="color: rgba(0, 0, 0, 1)">)randomFile.read()); } randomFile.close(); </span><span style="color: rgba(0, 0, 255, 1)">return</span><span style="color: rgba(0, 0, 0, 1)"> str.toString(); } </span><span style="color: rgba(0, 0, 255, 1)">catch</span><span style="color: rgba(0, 0, 0, 1)"> (IOException e) { e.printStackTrace(); } </span><span style="color: rgba(0, 0, 255, 1)">return</span> "异常"<span style="color: rgba(0, 0, 0, 1)">; } }
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