import java.io.File;
import java.io.FileNotFoundException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.channels.FileChannel;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;
import java.util.Observable;
public class ReadFile extends Observable {
private int bufSize = 1024;
// 换行符
private byte key = "\n".getBytes()[0];
// 当前行数
private long lineNum = 0;
// 文件编码,默认为gb2312
private String encode = "gb2312";
// 具体业务逻辑监听器
private ReaderFileListener readerListener;
public static int tmpNum = 0;
public static int serverNum = 0;
public static List<String> create = new ArrayList<>();
public static List<String> destory = new ArrayList<>();
long beforeTmp = System.currentTimeMillis();
public void setEncode(String encode) {
this.encode = encode;
}
public void setReaderListener(ReaderFileListener readerListener) {
this.readerListener = readerListener;
}
/**
* 获取准确开始位置
* @param file
* @param position
* @return
* @throws Exception
*/
public long getStartNum(File file, long position) throws Exception {
long startNum = position;
FileChannel fcin = new RandomAccessFile(file, "r").getChannel();
fcin.position(position);
try {
int cache = 1024;
ByteBuffer rBuffer = ByteBuffer.allocate(cache);
// 每次读取的内容
byte[] bs = new byte[cache];
// 缓存
byte[] tempBs = new byte[0];
String line = "";
while (fcin.read(rBuffer) != -1) {
int rSize = rBuffer.position();
rBuffer.rewind();
rBuffer.get(bs);
rBuffer.clear();
byte[] newStrByte = bs;
// 如果发现有上次未读完的缓存,则将它加到当前读取的内容前面
if (null != tempBs) {
int tL = tempBs.length;
newStrByte = new byte[rSize + tL];
System.arraycopy(tempBs, 0, newStrByte, 0, tL);
System.arraycopy(bs, 0, newStrByte, tL, rSize);
}
// 获取开始位置之后的第一个换行符
int endIndex = indexOf(newStrByte, 0);
if (endIndex != -1) {
return startNum + endIndex;
}
tempBs = substring(newStrByte, 0, newStrByte.length);
startNum += 1024;
}
} catch (Exception e) {
e.printStackTrace();
} finally {
fcin.close();
}
return position;
}
/**
* 从设置的开始位置读取文件，一直到结束为止。如果 end设置为负数,刚读取到文件末尾
* @param fullPath
* @param start
* @param end
* @throws Exception
*/
public void readFileByLine(String fullPath, long start, long end) throws Exception {
File fin = new File(fullPath);
if (fin.exists()) {
FileChannel fcin = new RandomAccessFile(fin, "r").getChannel();
fcin.position(start);
try {
ByteBuffer rBuffer = ByteBuffer.allocate(bufSize);
// 每次读取的内容
byte[] bs = new byte[bufSize];
// 缓存
byte[] tempBs = new byte[0];
String line = "";
// 当前读取文件位置
long nowCur = start;
while (fcin.read(rBuffer) != -1) {
nowCur += bufSize;
int rSize = rBuffer.position();
rBuffer.rewind();
rBuffer.get(bs);
rBuffer.clear();
byte[] newStrByte = bs;
// 如果发现有上次未读完的缓存,则将它加到当前读取的内容前面
if (null != tempBs) {
int tL = tempBs.length;
newStrByte = new byte[rSize + tL];
System.arraycopy(tempBs, 0, newStrByte, 0, tL);
System.arraycopy(bs, 0, newStrByte, tL, rSize);
}
// 是否已经读到最后一位
boolean isEnd = false;
// 如果当前读取的位数已经比设置的结束位置大的时候，将读取的内容截取到设置的结束位置
if (end > 0 && nowCur > end) {
// 缓存长度 - 当前已经读取位数 - 最后位数
int l = newStrByte.length - (int) (nowCur - end);
newStrByte = substring(newStrByte, 0, l);
isEnd = true;
}
int fromIndex = 0;
int endIndex = 0;
// 每次读一行内容，以 key（默认为\n） 作为结束符
while ((endIndex = indexOf(newStrByte, fromIndex)) != -1) {
byte[] bLine = substring(newStrByte, fromIndex, endIndex);
line = new String(bLine, 0, bLine.length, encode);
lineNum++;
// 输出一行内容，处理方式由调用方提供
outLine(line.trim());
fromIndex = endIndex + 1;
}
// 将未读取完成的内容放到缓存中
tempBs = substring(newStrByte, fromIndex, newStrByte.length);
if (isEnd) {
break;
}
}
// 将剩下的最后内容作为一行，输出，并指明这是最后一行
String lineStr = new String(tempBs, 0, tempBs.length, encode);
outLine(lineStr.trim());
long afterTmp = System.currentTimeMillis();
long serverTimeAll = 0;
long serverAveTime = 0;
for (int s = 0;s<create.size();s++){
serverTimeAll = serverTimeAll + timeCalculate(create.get(s),destory.get(s));
}
System.out.println(serverNum);
serverAveTime = serverTimeAll / serverNum;
long afterServer = System.currentTimeMillis();
String tmpRes = "tmp/*/test*,"+"count:"+tmpNum+",运行用时 "+(afterTmp-beforeTmp);
String serverRes = "请求（开始：appServer-create task 结束：appServer-destory task），"+"count"+serverNum+",平均性能 "+serverAveTime+",运行用时"+(afterServer-beforeTmp);
System.out.println(tmpRes);
System.out.println(serverRes);
} catch (Exception e) {
e.printStackTrace();
} finally {
fcin.close();
}
} else {
throw new FileNotFoundException("没有找到文件：" + fullPath);
}
// 通知观察者,当前工作已经完成
setChanged();
notifyObservers(start+"-"+end);
}
/**
* 查找一个byte[]从指定位置之后的一个换行符位置
*
* @param src
* @param fromIndex
* @return
* @throws Exception
*/
private int indexOf(byte[] src, int fromIndex) throws Exception {
for (int i = fromIndex; i < src.length; i++) {
if (src[i] == key) {
return i;
}
}
return -1;
}
/**
* 从指定开始位置读取一个byte[]直到指定结束位置为止生成一个全新的byte[]
*
* @param src
* @param fromIndex
* @param endIndex
* @return
* @throws Exception
*/
private byte[] substring(byte[] src, int fromIndex, int endIndex) throws Exception {
int size = endIndex - fromIndex;
byte[] ret = new byte[size];
System.arraycopy(src, fromIndex, ret, 0, size);
return ret;
}
public void outLine(String lineStr){
System.out.println(lineStr);
String[] logArray = lineStr.split(" ");
if (logArray.length >= 4 && logArray[3] != null && logArray[3].equals("appServer-create")){
serverNum++;
create.add(logArray[1]);
System.out.println(serverNum);
System.out.println(create.get(0));
}else if (logArray.length >= 4 && logArray[3] != null && logArray[3].equals("appServer-destroy")){
destory.add(logArray[1]);
}
if (logArray.length>=5){
for (int i = 4;i<logArray.length;i++){
if (!logArray[i].equals("/") && Utils.StringFilter(logArray[i])){
tmpNum++;
}
}
}
}
public static long timeCalculate(String str1, String str2) throws ParseException {
SimpleDateFormat formatter = new SimpleDateFormat( "hh:mm:ss.SSS");
long date1 = formatter.parse(str1).getTime();
long date2 = formatter.parse(str2).getTime();
return date2 - date1;
}
}
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