• Java实现bt文件下载、制作、解析、磁力链接

    首先torrent里面肯定携带的有一些信息，所以就需要我们来解析这些信息。

         我们这里做多文件制作torrent，所以首先要针对每一个文件建一个实体类

    [java] view plain copy
     
    1. import java.util.List;  
    2.   
    3. public class Info {  
    4.     private String name;  
    5.     private byte[] pieces;  
    6.     private long piecesLength;  
    7.     private long length;  
    8.     private String md5sum;  
    9.     private List<Files> files;  
    10.   
    11.     public Info() {  
    12.     }  
    13.   
    14.     public Info(String name, byte[] pieces, long piecesLength, long length, String md5sum, List<Files> files) {  
    15.         super();  
    16.         this.name = name;  
    17.         this.pieces = pieces;  
    18.         this.piecesLength = piecesLength;  
    19.         this.length = length;  
    20.         this.md5sum = md5sum;  
    21.         this.files = files;  
    22.     }  
    23.   
    24.     public String getName() {  
    25.         return name;  
    26.     }  
    27.   
    28.     public void setName(String name) {  
    29.         this.name = name;  
    30.     }  
    31.   
    32.     public byte[] getPieces() {  
    33.         return pieces;  
    34.     }  
    35.   
    36.     public void setPieces(byte[] pieces) {  
    37.         this.pieces = pieces;  
    38.     }  
    39.   
    40.     public long getPiecesLength() {  
    41.         return piecesLength;  
    42.     }  
    43.   
    44.     public void setPiecesLength(long piecesLength) {  
    45.         this.piecesLength = piecesLength;  
    46.     }  
    47.   
    48.     public long getLength() {  
    49.         return length;  
    50.     }  
    51.   
    52.     public void setLength(long length) {  
    53.         this.length = length;  
    54.     }  
    55.   
    56.     public String getMd5sum() {  
    57.         return md5sum;  
    58.     }  
    59.   
    60.     public void setMd5sum(String md5sum) {  
    61.         this.md5sum = md5sum;  
    62.     }  
    63.   
    64.     public List<Files> getFiles() {  
    65.         return files;  
    66.     }  
    67.   
    68.     public void setFiles(List<Files> files) {  
    69.         this.files = files;  
    70.     }  

          而对于每一个File,又存在了一些信息,所以我们针对File建立一个实体类

          

    [java] view plain copy
     
    1. import java.util.List;  
    2.   
    3. public class Files {  
    4.     private long length;  
    5.     private String md5sum;  
    6.     private List<String> path;  
    7.   
    8.     public Files() {  
    9.     }  
    10.     //getter and setter  and tostring  
    11.       
    12.     public long getLength() {  
    13.         return length;  
    14.     }  
    15.   
    16.     public Files(long length, String md5sum, List<String> path) {  
    17.         super();  
    18.         this.length = length;  
    19.         this.md5sum = md5sum;  
    20.         this.path = path;  
    21.     }  
    22.   
    23.     public void setLength(long length) {  
    24.         this.length = length;  
    25.     }  
    26.   
    27.     public String getMd5sum() {  
    28.         return md5sum;  
    29.     }  
    30.   
    31.     public void setMd5sum(String md5sum) {  
    32.         this.md5sum = md5sum;  
    33.     }  
    34.   
    35.     public List<String> getPath() {  
    36.         return path;  
    37.     }  
    38.   
    39.     public void setPath(List<String> path) {  
    40.         this.path = path;  
    41.     }  
    42. }  

    而我们在制作torrent文件时，填写了很多信息，比如要web seeds等等。所以此时也需要一个实体类

    [java] view plain copy
     
    1. import java.util.Arrays;  
    2. import java.util.List;  
    3.   
    4. import org.jeecgframework.core.util.StringUtil;  
    5.   
    6. public class BitTorrentInfo {  
    7.     public static List<String> keyList;  
    8.     static{  
    9.         String[] keys = {"announce", "announce-list", "creation date", "comment", "created by",  
    10.                 "info", "length", "md5sum", "name", "piece length","pieces", "files", "path"};  
    11.         keyList = Arrays.asList(keys);  
    12.     }  
    13.   
    14.     private String announce;  
    15.     private List<String> announceList;  
    16.     private long creationDate;  
    17.     private String comment;  
    18.     private String createBy;  
    19.     private Info info;  
    20.   
    21.     public BitTorrentInfo() {  
    22.     }  
    23.   
    24.     //getter and setter  and tostring  
    25.   
    26.     public BitTorrentInfo(String announce, List<String> announceList, long creationDate, String comment,  
    27.             String createBy, Info info) {  
    28.         super();  
    29.         this.announce = announce;  
    30.         this.announceList = announceList;  
    31.         this.creationDate = creationDate;  
    32.         this.comment = comment;  
    33.         this.createBy = createBy;  
    34.         this.info = info;  
    35.     }  
    36.   
    37.     public static List<String> getKeyList() {  
    38.         return keyList;  
    39.     }  
    40.   
    41.     public static void setKeyList(List<String> keyList) {  
    42.         BitTorrentInfo.keyList = keyList;  
    43.     }  
    44.   
    45.     public String getAnnounce() {  
    46.         return announce;  
    47.     }  
    48.   
    49.     public void setAnnounce(String announce) {  
    50.         this.announce = announce;  
    51.     }  
    52.   
    53.     public List<String> getAnnounceList() {  
    54.         return announceList;  
    55.     }  
    56.   
    57.     public void setAnnounceList(List<String> announceList) {  
    58.         this.announceList = announceList;  
    59.     }  
    60.   
    61.     public long getCreationDate() {  
    62.         return creationDate;  
    63.     }  
    64.   
    65.     public void setCreationDate(long creationDate) {  
    66.         this.creationDate = creationDate;  
    67.     }  
    68.   
    69.     public String getComment() {  
    70.         return comment;  
    71.     }  
    72.   
    73.     public void setComment(String comment) {  
    74.         this.comment = comment;  
    75.     }  
    76.   
    77.     public String getCreateBy() {  
    78.         return createBy;  
    79.     }  
    80.   
    81.     public void setCreateBy(String createBy) {  
    82.         this.createBy = createBy;  
    83.     }  
    84.   
    85.     public Info getInfo() {  
    86.         return info;  
    87.     }  
    88.   
    89.     public void setInfo(Info info) {  
    90.         this.info = info;  
    91.     }  
    92.   
    93.     public void setValue(String key, Object value) throws Exception {  
    94.         if(!keyList.contains(key)){  
    95.             throw new Exception("not contains this key: " + key);  
    96.         }else{  
    97.             switch (key){  
    98.                 case "announce":this.setAnnounce(value.toString());break;  
    99.                 case "announce-list":this.getAnnounceList().add(value.toString());break;  
    100.                 case "creation date":  
    101.                     if(StringUtil.isNumeric(value.toString())){  
    102.                         this.setCreationDate(Long.parseLong(value.toString()));  
    103.                     }else{  
    104.                         this.setCreationDate(0);  
    105.                     }  
    106.                     break;  
    107.                 case "comment":this.setComment(value.toString());break;  
    108.                 case "created by":this.setCreateBy(value.toString());break;  
    109.                 case "length":  
    110.                     List<Files> filesList1 = this.getInfo().getFiles();  
    111.                     if(filesList1 != null){  
    112.                         Files files = this.getInfo().getFiles().get(filesList1.size()-1);  
    113.                         files.setLength(Long.parseLong(value.toString()));  
    114.                     }else {  
    115.                         this.getInfo().setLength(Long.parseLong(value.toString()));  
    116.                     }  
    117.                     break;  
    118.                 case "md5sum":  
    119.                     List<Files> filesList2 = this.getInfo().getFiles();  
    120.                     if(filesList2 != null){  
    121.                         Files files = this.getInfo().getFiles().get(filesList2.size()-1);  
    122.                         files.setMd5sum(value.toString());  
    123.                     }else {  
    124.                         this.getInfo().setMd5sum(value.toString());  
    125.                     }  
    126.                     break;  
    127.                 case "name":  
    128.                     this.getInfo().setName(value.toString());  
    129.                     break;  
    130.                 case "piece length":  
    131.                     this.getInfo().setPiecesLength(Long.parseLong(value.toString()));  
    132.                     break;  
    133.                 case "pieces":  
    134.                     if(StringUtil.isNumeric(value.toString())){  
    135.                         this.getInfo().setPieces(null);  
    136.                     }else{  
    137.                         this.getInfo().setPieces((byte[])value);  
    138.                     }  
    139.                     break;  
    140.                 case "path":  
    141.                     List<Files> filesList3 = this.getInfo().getFiles();  
    142.                     Files files3 = filesList3.get(filesList3.size()-1);  
    143.                     files3.getPath().add(value.toString());  
    144.                     break;  
    145.             }  
    146.         }  
    147.     }      
    148. }  

    解析实体类

    [java] view plain copy
     
    1. import java.io.File;  
    2. import java.io.FileInputStream;  
    3. import java.io.InputStream;  
    4. import java.util.LinkedList;  
    5. import java.util.List;  
    6.   
    7. public class BitTorrents {  
    8.     public static BitTorrentInfo parse(File btFile) throws Exception {  
    9.         return new BitTorrents().analyze(new FileInputStream(btFile));  
    10.     }  
    11.   
    12.     public static BitTorrentInfo parse(String btFilePath) throws Exception {  
    13.         return new BitTorrents().analyze(new FileInputStream(btFilePath));  
    14.     }  
    15.   
    16.     private BitTorrentInfo analyze(InputStream is) throws Exception {  
    17.         BitTorrentInfo btInfo = new BitTorrentInfo();  
    18.         String key = null;  
    19.         StringBuilder strLengthBuilder = new StringBuilder();  
    20.         int tempByte;  
    21.         while ((tempByte = is.read()) != -1) {  
    22.             char temp = (char) tempByte;  
    23.             switch (temp) {  
    24.                 case 'i':  
    25.                     StringBuilder itempBuilder = new StringBuilder();  
    26.                     char iTemp;  
    27.                     while ((iTemp = (char) is.read()) != 'e') {  
    28.                         itempBuilder.append(iTemp);  
    29.                     }  
    30.                     btInfo.setValue(key, itempBuilder.toString());  
    31.                     break;  
    32.                 case '0': case '1': case  '2': case '3': case '4': case  '5': case '6': case '7': case '8': case '9':  
    33.                     strLengthBuilder.append(temp);  
    34.                     break;  
    35.                 case ':':  
    36.                     int strLen = Integer.parseInt(strLengthBuilder.toString());  
    37.                     strLengthBuilder = new StringBuilder();  
    38.                     byte[] tempBytes = new byte[strLen];  
    39.                     is.read(tempBytes);  
    40.                     if (key != null && key.equals("pieces")) {  
    41.                         btInfo.setValue(key, tempBytes);  
    42.                     } else {  
    43.                         String tempStr = new String(tempBytes);  
    44.                         if (BitTorrentInfo.keyList.contains(tempStr)) {  
    45.                             key = tempStr;  
    46.                             if (tempStr.equals("announce-list")) {  
    47.                                 btInfo.setAnnounceList(new LinkedList<String>());  
    48.                             } else if (tempStr.equals("info")) {  
    49.                                 btInfo.setInfo(new Info());  
    50.                             } else if (tempStr.equals("files")) {  
    51.                                 btInfo.getInfo().setFiles(new LinkedList<Files>());  
    52.                                 btInfo.getInfo().getFiles().add(new Files());  
    53.                             } else if (tempStr.equals("length")) {  
    54.                                 List<Files> tempFiles = btInfo.getInfo().getFiles();  
    55.                                 if (tempFiles != null) {  
    56.                                     if (tempFiles.isEmpty() || tempFiles.get(tempFiles.size() - 1).getLength() != 0) {  
    57.                                         tempFiles.add(new Files());  
    58.                                     }  
    59.                                 }  
    60.                             } else if (tempStr.equals("md5sum")) {  
    61.                                 List<Files> tempFiles = btInfo.getInfo().getFiles();  
    62.                                 if (tempFiles != null) {  
    63.                                     if (tempFiles.isEmpty() || tempFiles.get(tempFiles.size() - 1).getMd5sum() != null) {  
    64.                                         tempFiles.add(new Files());  
    65.                                     }  
    66.                                 }  
    67.                             } else if (tempStr.equals("path")) {  
    68.                                 List<Files> tempFilesList = btInfo.getInfo().getFiles();  
    69.                                 if (tempFilesList.isEmpty()) {  
    70.                                     Files files = new Files();  
    71.                                     files.setPath(new LinkedList<String>());  
    72.                                     tempFilesList.add(files);  
    73.                                 } else {  
    74.                                     Files files = tempFilesList.get(tempFilesList.size() - 1);  
    75.                                     if (files.getPath() == null) {  
    76.                                         files.setPath(new LinkedList<String>());  
    77.                                     }  
    78.                                 }  
    79.                             }  
    80.                         } else {  
    81.                             btInfo.setValue(key, tempStr);  
    82.                         }  
    83.                     }  
    84.                     break;  
    85.             }  
    86.         }  
    87.         return btInfo;  
    88.     }  
    89.   
    90.     public static void main(String[] args) throws Exception {  
    91.         BitTorrentInfo info=parse("E://xx/xx.torrent");  
    92.         System.out.println("信息:"+info.getAnnounce()+" "+info.getComment()+" "+info.getCreateBy()+" "+GetDate.LongConvetDateTime(info.getCreationDate()));  
    93.         Info it=info.getInfo();  
    94.         System.out.println("信息:"+it.getName()+" "+it.getPiecesLength()+" "+it.getLength()+" "+it.getMd5sum()+" "+it.getPieces());  
    95.         if(info.getAnnounceList().size()>0){  
    96.             for(String str:info.getAnnounceList()){  
    97.                 System.out.println("信息2:"+str);  
    98.             }  
    99.         }  
    100.         if(it.getFiles().size()>0){  
    101.             for(Files file: it.getFiles()){  
    102.                 System.out.println("信息3:"+file.getLength()+" "+file.getMd5sum());  
    103.                 if(file.getPath().size()>0){  
    104.                     for(String str:file.getPath()){  
    105.                         System.out.println("信息4："+str);  
    106.                     }  
    107.                 }  
    108.             }  
    109.         }  
    110.     }  
    111. }  
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  • 原文地址：https://www.cnblogs.com/happyday56/p/9024181.html
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