Java 字符串与文件的相互转换 博客分类: SorLib java字符串文件
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2024-03-11 23:52:02
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package com.honda.dms.cdhp; import java.io.BufferedInputStream; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.File; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.io.OutputStream; import java.io.OutputStreamWriter; import java.util.Enumeration; import java.util.HashMap; import java.util.Map; import java.util.Properties; public class UtilTools { /** * change the content to a string. * * @param file * @return the content of file. */ public static final String file2String(File file) { BufferedReader br; StringBuilder strBlder = new StringBuilder(""); try { br = new BufferedReader(new InputStreamReader(new FileInputStream( file))); String line = ""; while (null != (line = br.readLine())) { strBlder.append(line + "\n"); } br.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return strBlder.toString(); } /** * change the content to a string. * * @param file * @return the content of file. */ public static final String fileInputStream2String(InputStream is) { BufferedReader br; StringBuilder strBlder = new StringBuilder(""); try { br = new BufferedReader(new InputStreamReader(is)); String line = ""; while (null != (line = br.readLine())) { strBlder.append(line + "\n"); } br.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } return strBlder.toString(); } /** * save string to a file(recover). * * @param file * @param content * @return success flag. */ public static final boolean saveString2File(File file, String content) { try { BufferedWriter bw = new BufferedWriter(new OutputStreamWriter( new FileOutputStream(file))); bw.write(content); bw.close(); return true; } catch (Exception e) { return false; } } public static final String changeFirstCharacterToLowerCase( String upperCaseStr) { char[] chars = new char[1]; chars[0] = upperCaseStr.charAt(0); String temp = new String(chars); if (chars[0] >= 'A' && chars[0] <= 'Z') { upperCaseStr = upperCaseStr.replaceFirst(temp, temp.toLowerCase()); } return upperCaseStr; } private final static String SYS_TEMP_FILE = System .getProperty("java.io.tmpdir") + "\\9884698793643198z.properties"; private static Map<String, String> fileNames = null; /** * get a file path from a system temp file. * * @param keyOfFileName * @return */ public static final String getAFilePathFromSysTempFile(String keyOfFileName) { if (null == fileNames) { fileNames = new HashMap<String, String>(); loadFilePathsFromSysTempFile(); } String path = fileNames.get(keyOfFileName); return null == path ? "" : path; } private static final boolean loadFilePathsFromSysTempFile() { try { if (!new File(SYS_TEMP_FILE).exists()) { new File(SYS_TEMP_FILE).createNewFile(); return true; } Properties props = new Properties(); InputStream in = new BufferedInputStream(new FileInputStream( SYS_TEMP_FILE)); props.load(in); Enumeration<?> en = props.propertyNames(); while (en.hasMoreElements()) { String key = (String) en.nextElement(); String prop = props.getProperty(key); fileNames.put(key, prop); } return true; } catch (Exception e) { e.printStackTrace(); return false; } } /** * save a file path to a system temp file. * * @param parameterName * @param parameterValue * @return */ public static final int saveAFilePathToSysTempFile(String parameterName, String parameterValue) { Properties prop = new Properties(); try { InputStream fis = new FileInputStream(SYS_TEMP_FILE); prop.load(fis); OutputStream fos = new FileOutputStream(SYS_TEMP_FILE); prop.setProperty(parameterName, parameterValue); prop.store(fos, "Update '" + parameterName + "' value"); fileNames.put(parameterName, parameterValue); return fileNames.size(); } catch (IOException e) { e.printStackTrace(); return -1; } } }
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