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java面试题：读取文件中含有ERROR的行
public class LogsUtils {private static final String LOG_PATH = "foshan.log";public String readError() {StringBuilder build = new StringBuilder();InputStream is = null;InputStreamReader isReader = null;BufferedReader bufReader = null;try {// 读取相对路径下的文件is = Thread.currentThread().getContextClassLoader().getResourceAsStream(LOG_PATH);isReader = new InputStreamReader(is);bufReader = new BufferedReader(isReader);String line = null;while ((line=bufReader.readLine()) != null) {if (line.contains("ERROR") || line.contains("error")) {build.append(line).append("\n");}}} catch (FileNotFoundException e) {e.printStackTrace();} catch (IOException e) {e.printStackTrace();} catch (Exception e) {e.printStackTrace();} finally {closeIO(bufReader, isReader, is);}return build.toString();}public void closeIO(BufferedReader bufReader, InputStreamReader isReader,InputStream is) {if (null != bufReader) {try {bufReader.close();} catch (IOException e) {e.printStackTrace();}bufReader = null;}if (null != isReader) {try {isReader.close();} catch (IOException e) {e.printStackTrace();}isReader = null;}if (null != is) {try {is.close();} catch (IOException e) {e.printStackTrace();}is = null;}}public static void main(String[] args) {String error = new LogsUtils().readError();System.out.println(error);}
}
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