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      java對本地日志文件的讀寫

       aaie_ 2016-01-13
      package mytools;
      import java.io.BufferedReader;
      import java.io.File;
      import java.io.FileNotFoundException;
      import java.io.FileReader;
      import java.io.FileWriter;
      import java.io.IOException;
      /**
       * 這是一個(gè)與日志讀寫有關(guān)的類,定義了一些通用的方法
       * @author Devon
       *
       */
      public class LogsReaderWriter {
           
          /**
           *
           * @param filePath      文件路徑的字符串表示形式
           * @param KeyWords      查找包含某個(gè)關(guān)鍵字的信息:非null為帶關(guān)鍵字查詢;null為全文顯示
           * @return      當(dāng)文件存在時(shí),返回字符串;當(dāng)文件不存在時(shí),返回null
           */
          public static String readFromFile(String filePath, String KeyWords){
              StringBuffer stringBuffer = null;
              File file = new File(filePath);
              if(file.exists()){
                  stringBuffer = new StringBuffer();
                  FileReader fileReader = null;
                  BufferedReader bufferedReader = null;
                  String temp = "";
                  try {
                      fileReader = new FileReader(file);
                      bufferedReader = new BufferedReader(fileReader);
                      while((temp = bufferedReader.readLine()) != null){
                          if(KeyWords ==null){
                              stringBuffer.append(temp + "\n");
                          }else{
                              if(temp.contains(KeyWords)){
                                  stringBuffer.append(temp + "\n");
                              }
                          }
                      }
                  } catch (FileNotFoundException e) {
                      //e.printStackTrace();
                  } catch (IOException e) {
                      //e.printStackTrace();
                  }finally{
                      try {
                          fileReader.close();
                      } catch (IOException e) {
                          //e.printStackTrace();
                      }
                      try {
                          bufferedReader.close();
                      } catch (IOException e) {
                          //e.printStackTrace();
                      }
                  }
              }
              if(stringBuffer == null){
                  return null;
              }else{
                  return stringBuffer.toString();
              }
               
               
          }
           
          /**
           * 將指定字符串寫入文件。如果給定的文件路徑不存在,將新建文件后寫入。
           * @param log       要寫入文件的字符串
           * @param filePath      文件路徑的字符串表示形式,目錄的層次分隔可以是“/”也可以是“\\”
           * @param isAppend      true:追加到文件的末尾;false:以覆蓋原文件的方式寫入
           */        
            
          public static boolean writeIntoFile(String log, String filePath, boolean isAppend){
              boolean isSuccess = true;
              //如有則將"\\"轉(zhuǎn)為"/",沒有則不產(chǎn)生任何變化
              String filePathTurn = filePath.replaceAll("\\\\", "/");
              //先過濾掉文件名
              int index = filePath.lastIndexOf("/");
              String dir = filePath.substring(0, index);
              //創(chuàng)建除文件的路徑
              File fileDir = new File(dir);
              fileDir.mkdirs();
              //再創(chuàng)建路徑下的文件
              File file = null;
              try {
                  file = new File(filePath);
                  file.createNewFile();
              } catch (IOException e) {
                  isSuccess = false;
                  //e.printStackTrace();
              }
              //將logs寫入文件
              FileWriter fileWriter = null;
              try {
                  fileWriter = new FileWriter(file, isAppend);
                  fileWriter.write(log);
                  fileWriter.flush();
              } catch (IOException e) {
                  isSuccess = false;
                  //e.printStackTrace();
              } finally{
                  try {
                      fileWriter.close();
                  } catch (IOException e) {
                      //e.printStackTrace();
                  }
              }
               
              return isSuccess;
          }
          /**
           * 創(chuàng)建文件,如果該文件已存在將不再創(chuàng)建(即不起任何作用)
           * @param filePath       要?jiǎng)?chuàng)建文件的路徑的字符串表示形式,目錄的層次分隔可以是“/”也可以是“\\”
           * @return      創(chuàng)建成功將返回true;創(chuàng)建不成功則返回false
           */
          public static boolean createNewFile(String filePath){
              boolean isSuccess = true;
              //如有則將"\\"轉(zhuǎn)為"/",沒有則不產(chǎn)生任何變化
              String filePathTurn = filePath.replaceAll("\\\\", "/");
              //先過濾掉文件名
              int index = filePathTurn.lastIndexOf("/");
              String dir = filePathTurn.substring(0, index);
              //再創(chuàng)建文件夾
              File fileDir = new File(dir);
              isSuccess = fileDir.mkdirs();
              //創(chuàng)建文件
              File file = new File(filePathTurn);
              try {
                  isSuccess = file.createNewFile();
              } catch (IOException e) {
                  isSuccess = false;
                  //e.printStackTrace();
              }
              return isSuccess;
          }
      }

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