? ? ?首先torrent里面肯定攜帶的有一些信息，所以就需要我們來解析這些信息。

? ? ?我們這里做多文件制作torrent，所以首先要針對每一個文件建一個實體類

import java.util.List;public class Info {private String name;private byte[] pieces;private long piecesLength;private long length;private String md5sum;private List<Files> files;public Info() {}public Info(String name, byte[] pieces, long piecesLength, long length, String md5sum, List<Files> files) {super();this.name = name;this.pieces = pieces;this.piecesLength = piecesLength;this.length = length;this.md5sum = md5sum;this.files = files;}public String getName() {return name;}public void setName(String name) {this.name = name;}public byte[] getPieces() {return pieces;}public void setPieces(byte[] pieces) {this.pieces = pieces;}public long getPiecesLength() {return piecesLength;}public void setPiecesLength(long piecesLength) {this.piecesLength = piecesLength;}public long getLength() {return length;}public void setLength(long length) {this.length = length;}public String getMd5sum() {return md5sum;}public void setMd5sum(String md5sum) {this.md5sum = md5sum;}public List<Files> getFiles() {return files;}public void setFiles(List<Files> files) {this.files = files;}? ? ? 而對于每一個File,又存在了一些信息,所以我們針對File建立一個實體類

? ? ??

import java.util.List;public class Files {private long length;private String md5sum;private List<String> path;public Files() {}//getter and setter and tostringpublic long getLength() {return length;}public Files(long length, String md5sum, List<String> path) {super();this.length = length;this.md5sum = md5sum;this.path = path;}public void setLength(long length) {this.length = length;}public String getMd5sum() {return md5sum;}public void setMd5sum(String md5sum) {this.md5sum = md5sum;}public List<String> getPath() {return path;}public void setPath(List<String> path) {this.path = path;} } 而我們在制作torrent文件時，填寫了很多信息，比如要web seeds等等。所以此時也需要一個實體類

import java.util.Arrays; import java.util.List;import org.jeecgframework.core.util.StringUtil;public class BitTorrentInfo {public static List<String> keyList;static{String[] keys = {"announce", "announce-list", "creation date", "comment", "created by","info", "length", "md5sum", "name", "piece length","pieces", "files", "path"};keyList = Arrays.asList(keys);}private String announce;private List<String> announceList;private long creationDate;private String comment;private String createBy;private Info info;public BitTorrentInfo() {}//getter and setter and tostringpublic BitTorrentInfo(String announce, List<String> announceList, long creationDate, String comment,String createBy, Info info) {super();this.announce = announce;this.announceList = announceList;this.creationDate = creationDate;this.comment = comment;this.createBy = createBy;this.info = info;}public static List<String> getKeyList() {return keyList;}public static void setKeyList(List<String> keyList) {BitTorrentInfo.keyList = keyList;}public String getAnnounce() {return announce;}public void setAnnounce(String announce) {this.announce = announce;}public List<String> getAnnounceList() {return announceList;}public void setAnnounceList(List<String> announceList) {this.announceList = announceList;}public long getCreationDate() {return creationDate;}public void setCreationDate(long creationDate) {this.creationDate = creationDate;}public String getComment() {return comment;}public void setComment(String comment) {this.comment = comment;}public String getCreateBy() {return createBy;}public void setCreateBy(String createBy) {this.createBy = createBy;}public Info getInfo() {return info;}public void setInfo(Info info) {this.info = info;}public void setValue(String key, Object value) throws Exception {if(!keyList.contains(key)){throw new Exception("not contains this key: " + key);}else{switch (key){case "announce":this.setAnnounce(value.toString());break;case "announce-list":this.getAnnounceList().add(value.toString());break;case "creation date":if(StringUtil.isNumeric(value.toString())){this.setCreationDate(Long.parseLong(value.toString()));}else{this.setCreationDate(0);}break;case "comment":this.setComment(value.toString());break;case "created by":this.setCreateBy(value.toString());break;case "length":List<Files> filesList1 = this.getInfo().getFiles();if(filesList1 != null){Files files = this.getInfo().getFiles().get(filesList1.size()-1);files.setLength(Long.parseLong(value.toString()));}else {this.getInfo().setLength(Long.parseLong(value.toString()));}break;case "md5sum":List<Files> filesList2 = this.getInfo().getFiles();if(filesList2 != null){Files files = this.getInfo().getFiles().get(filesList2.size()-1);files.setMd5sum(value.toString());}else {this.getInfo().setMd5sum(value.toString());}break;case "name":this.getInfo().setName(value.toString());break;case "piece length":this.getInfo().setPiecesLength(Long.parseLong(value.toString()));break;case "pieces":if(StringUtil.isNumeric(value.toString())){this.getInfo().setPieces(null);}else{this.getInfo().setPieces((byte[])value);}break;case "path":List<Files> filesList3 = this.getInfo().getFiles();Files files3 = filesList3.get(filesList3.size()-1);files3.getPath().add(value.toString());break;}}} }解析實體類

import java.io.File; import java.io.FileInputStream; import java.io.InputStream; import java.util.LinkedList; import java.util.List;public class BitTorrents {public static BitTorrentInfo parse(File btFile) throws Exception {return new BitTorrents().analyze(new FileInputStream(btFile));}public static BitTorrentInfo parse(String btFilePath) throws Exception {return new BitTorrents().analyze(new FileInputStream(btFilePath));}private BitTorrentInfo analyze(InputStream is) throws Exception {BitTorrentInfo btInfo = new BitTorrentInfo();String key = null;StringBuilder strLengthBuilder = new StringBuilder();int tempByte;while ((tempByte = is.read()) != -1) {char temp = (char) tempByte;switch (temp) {case 'i':StringBuilder itempBuilder = new StringBuilder();char iTemp;while ((iTemp = (char) is.read()) != 'e') {itempBuilder.append(iTemp);}btInfo.setValue(key, itempBuilder.toString());break;case '0': case '1': case '2': case '3': case '4': case '5': case '6': case '7': case '8': case '9':strLengthBuilder.append(temp);break;case ':':int strLen = Integer.parseInt(strLengthBuilder.toString());strLengthBuilder = new StringBuilder();byte[] tempBytes = new byte[strLen];is.read(tempBytes);if (key != null && key.equals("pieces")) {btInfo.setValue(key, tempBytes);} else {String tempStr = new String(tempBytes);if (BitTorrentInfo.keyList.contains(tempStr)) {key = tempStr;if (tempStr.equals("announce-list")) {btInfo.setAnnounceList(new LinkedList<String>());} else if (tempStr.equals("info")) {btInfo.setInfo(new Info());} else if (tempStr.equals("files")) {btInfo.getInfo().setFiles(new LinkedList<Files>());btInfo.getInfo().getFiles().add(new Files());} else if (tempStr.equals("length")) {List<Files> tempFiles = btInfo.getInfo().getFiles();if (tempFiles != null) {if (tempFiles.isEmpty() || tempFiles.get(tempFiles.size() - 1).getLength() != 0) {tempFiles.add(new Files());}}} else if (tempStr.equals("md5sum")) {List<Files> tempFiles = btInfo.getInfo().getFiles();if (tempFiles != null) {if (tempFiles.isEmpty() || tempFiles.get(tempFiles.size() - 1).getMd5sum() != null) {tempFiles.add(new Files());}}} else if (tempStr.equals("path")) {List<Files> tempFilesList = btInfo.getInfo().getFiles();if (tempFilesList.isEmpty()) {Files files = new Files();files.setPath(new LinkedList<String>());tempFilesList.add(files);} else {Files files = tempFilesList.get(tempFilesList.size() - 1);if (files.getPath() == null) {files.setPath(new LinkedList<String>());}}}} else {btInfo.setValue(key, tempStr);}}break;}}return btInfo;}public static void main(String[] args) throws Exception {BitTorrentInfo info=parse("E://xx/xx.torrent");System.out.println("信息:"+info.getAnnounce()+"\t"+info.getComment()+"\t"+info.getCreateBy()+"\t"+GetDate.LongConvetDateTime(info.getCreationDate()));Info it=info.getInfo();System.out.println("信息:"+it.getName()+"\t"+it.getPiecesLength()+"\t"+it.getLength()+"\t"+it.getMd5sum()+"\t"+it.getPieces());if(info.getAnnounceList().size()>0){for(String str:info.getAnnounceList()){System.out.println("信息2:"+str);}}if(it.getFiles().size()>0){for(Files file: it.getFiles()){System.out.println("信息3:"+file.getLength()+"\t"+file.getMd5sum());if(file.getPath().size()>0){for(String str:file.getPath()){System.out.println("信息4："+str);}}}}} }

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