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
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
import java.util.List;
public class Files {
private long length;
private String md5sum;
private List<String> path;
public Files() {
}
//getter and setter and tostring
public 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
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 tostring
public 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;
}
}
}
}
解析实体类
[java] view plain copy
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()+” “+info.getComment()+” “+info.getCreateBy()+” “+GetDate.LongConvetDateTime(info.getCreationDate()));
Info it=info.getInfo();
System.out.println(“信息:”+it.getName()+” “+it.getPiecesLength()+” “+it.getLength()+” “+it.getMd5sum()+” “+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()+” “+file.getMd5sum());
if(file.getPath().size()>0){
for(String str:file.getPath()){
System.out.println(“信息4：”+str);
}
}
}
}
}
}
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