FileTools.java

package com.antbrains.crf.hadoop;

import java.io.*;
import java.util.*;

public class FileTools {
  public static void appendLine(String filePath, String line) throws IOException {
    try {
      BufferedWriter bw = new BufferedWriter(new FileWriter(filePath, true));
      bw.write(line + "\n");
      bw.close();
    } catch (IOException e) {
      throw e;
    }
  }

  public static void writeFile(String filePath, String content) throws Exception {
    BufferedWriter bw = null;
    try {
      bw = new BufferedWriter(new FileWriter(filePath));
      bw.write(content);
    } catch (Exception e) {
      throw e;
    } finally {
      try {
        if (bw != null)
          bw.close();
      } catch (IOException e) {

      }
    }
  }

  public static void writeCollections(String filePath, Collection<String> list, String encoding)
      throws IOException {
    BufferedWriter bw = null;
    try {
      bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath), encoding));
      for (String line : list) {
        bw.write(line + "\n");
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (bw != null)
          bw.close();
      } catch (IOException e) {
      }
    }
  }

  public static void writeList(String filePath, List<String> list, String encoding)
      throws IOException {
    BufferedWriter bw = null;
    try {
      bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath), encoding));
      for (String line : list) {
        bw.write(line + "\n");
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (bw != null)
          bw.close();
      } catch (IOException e) {
      }
    }
  }

  public static void writeFile(String filePath, String content, String encoding) throws IOException {
    BufferedWriter bw = null;
    try {
      bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(filePath), encoding));
      bw.write(content);
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (bw != null)
          bw.close();
      } catch (IOException e) {
      }
    }
  }

  public static String getFileName(String shortName) {
    if (shortName == null)
      return null;
    int index = shortName.lastIndexOf(".");
    if (index == -1)
      return shortName;
    return shortName.substring(0, index);
  }

  public static String getFileName(File file) {
    return getFileName(file.getName());
  }

  public static String readFile(String filePath) throws IOException {
    StringBuilder sb = new StringBuilder("");
    BufferedReader br = null;
    try {
      br = new BufferedReader(new FileReader(filePath));
      String line;
      while ((line = br.readLine()) != null) {
        sb.append(line + "\n");
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }

    }
    return sb.toString();
  }

  public static List<String> read2List(InputStream in) throws Exception {
    BufferedReader br = null;
    List<String> lines = new ArrayList<String>();
    try {
      String line;
      br = new BufferedReader(new InputStreamReader(in));
      while ((line = br.readLine()) != null) {
        lines.add(line);
      }
    } catch (Exception e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }
    }
    return lines;
  }

  public static List<String> read2List(InputStream in, String encoding) throws Exception {
    BufferedReader br = null;
    List<String> lines = new ArrayList<String>();
    try {
      String line;
      br = new BufferedReader(new InputStreamReader(in, encoding));
      while ((line = br.readLine()) != null) {
        lines.add(line);
      }
    } catch (Exception e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }
    }
    return lines;
  }

  public static List<String> readFile2List(String filePath) throws IOException {
    List<String> lines = new ArrayList<String>();
    BufferedReader br = null;
    try {
      br = new BufferedReader(new FileReader(filePath));
      String line;
      while ((line = br.readLine()) != null) {
        lines.add(line);
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }

    }
    return lines;
  }

  public static Map<String, Double> readFile2StringDoubleMap(String filePath, String encoding,
      String sep, boolean keyToLowercase) throws IOException {
    Map<String, Double> result = new HashMap<String, Double>();
    BufferedReader br = null;
    try {
      br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), encoding));
      String line;
      while ((line = br.readLine()) != null) {
        String[] arr = line.split(sep);
        if (keyToLowercase) {
          result.put(arr[0].toLowerCase().trim(), Double.valueOf(arr[1]));
        } else {
          result.put(arr[0].trim(), Double.valueOf(arr[1]));
        }
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }

    }
    return result;
  }

  public static List<String> readFile2List(String filePath, String encoding) throws IOException {
    List<String> lines = new ArrayList<String>();
    BufferedReader br = null;
    try {
      br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), encoding));
      String line;
      while ((line = br.readLine()) != null) {
        lines.add(line);
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }

    }
    return lines;
  }

  public static String readFile(String filePath, String encoding) throws IOException {
    StringBuilder sb = new StringBuilder("");
    BufferedReader br = null;
    try {
      br = new BufferedReader(new InputStreamReader(new FileInputStream(filePath), encoding));
      String line;
      while ((line = br.readLine()) != null) {
        sb.append(line + "\n");
      }
    } catch (IOException e) {
      throw e;
    } finally {
      try {
        if (br != null)
          br.close();
      } catch (IOException e) {
      }

    }
    return sb.substring(0, sb.length() - 1);
  }

  public static void makeDirs(String path) {
    File dir = new File(path);
    dir.mkdirs();
  }
}