指定行数读取log文件

package ocm.axb.cheney.collection;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;
public class ReadLog {
//将文本读取到List中并返回,path - 文件路径,List<String> - 返回读取文件行的集合
public static List<String> getFileContent(String path) {
List<String> strList = new ArrayList<String>();
try {
File file = new File(path);
InputStreamReader read = new InputStreamReader(new FileInputStream(
file), "UTF-8");
BufferedReader reader = new BufferedReader(read);
String line;
while ((line = reader.readLine()) != null) {
strList.add(line);
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return strList;
}

//获取指定行的值, path - 文件路径,row - 指定行, String - 返回指定行的数据,没有指定行时数据返回空字符串
public static String listFileByRow(String path, Integer row) {
List<String> strList = getFileContent(path);
int size = strList.size();
if (size >= (row - 1)) {
return strList.get(row - 1);
} else {
return "";
}
}

public static void main(String[] args) {
int startLine = 45;
System.out.println("第" + startLine + "行："
+ listFileByRow("E:\\db\\log4j_iws.log", startLine));
}
}

package ocm.axb.cheney.collection;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

public class ReadLog {
// 将文本读取到List中并返回,path - 文件路径,List<String> - 返回读取文件行的集合
public static List<String> getFileContent(String path) {
List<String> strList = new ArrayList<String>();
try {
File file = new File(path);
InputStreamReader read = new InputStreamReader(new FileInputStream(
file), "UTF-8");
BufferedReader reader = new BufferedReader(read);
String line;
while ((line = reader.readLine()) != null) {
strList.add(line);
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return strList;
}

public static List<String> listFileByRegionRow(String path,
Integer startLine, Integer endLine) {
List<String> strList = getFileContent(path);
// 指定区间的值存到regionList
List<String> regionList = new ArrayList<String>();
int size = strList.size();
// 次方法获取的是第几行到第几行的数据
if (size >= (endLine - 1)) {
for (int i = startLine; i <= endLine; i++)
regionList.add(strList.get(i - 1));
}
return regionList;
}

public static void main(String[] args) {
//读取log文件第65行到70行的数据
int startLine = 65, endLine = 70;
List<String> regionList = listFileByRegionRow("E:\\db\\log4j_iws.log",
startLine, endLine);
if (!regionList.isEmpty()) {
for (String strLine : regionList) {
System.out.println("第" + startLine + "行：" + strLine);
startLine++;
}
}

}
}

package ocm.axb.cheney.collection;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.ArrayList;
import java.util.List;

public class ReadLog {
// 将文本读取到List中并返回,path - 文件路径,List<String> - 返回读取文件行的集合
public static List<String> getFileContent(String path) {
List<String> strList = new ArrayList<String>();
try {
File file = new File(path);
InputStreamReader read = new InputStreamReader(new FileInputStream(
file), "UTF-8");
BufferedReader reader = new BufferedReader(read);
String line;
while ((line = reader.readLine()) != null) {
strList.add(line);
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return strList;
}

public static List<String> listFileByRegionRow(String path, Integer endLine) {
List<String> strList = getFileContent(path);
// 指定区间的值存到regionList
List<String> regionList = new ArrayList<String>();
int size = strList.size();
// 此处获取的是log最后多少行数据
if (size >= endLine) {
for (int i = size - endLine - 1; i < size; i++) {
regionList.add(strList.get(i));
}
}
return regionList;
}

public static void main(String[] args) {
// 读取log文件最后5行数据
int lastLine = 5;
List<String> regionList = listFileByRegionRow("E:\\db\\log4j_iws.log",
lastLine);
if (!regionList.isEmpty()) {
for (String strLine : regionList) {
System.out.println(strLine);
}
}

}
}