String –> InputStream
InputStrem is = new ByteArrayInputStream(str.getBytes());ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes());InputStream–>String
inputStream input;StringBuffer out = new StringBuffer();byte[] b = new byte[4096];for (int n; (n = input.read(b)) != -1;) { out.append(new String(b, 0, n)); }out.toString();or
InputStream in ; BufferedReader br = null;try { br = new BufferedReader(new InputStreamReader(in)); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } StringBuffer sb = new StringBuffer(); String tmp;try {while ((tmp = br.readLine()) != null) { sb.append(tmp + "\n"); } br.close(); in.close(); } catch (IOException e) { e.printStackTrace(); }return sb.toString();Reader –>String
BufferedReader in = new BufferedReader(new InputStreamReader(is));StringBuffer buffer = new StringBuffer();String line = " ";while ((line = in.readLine()) != null){buffer.append(line);}return buffer.toString();String–>Reader
Reader reader = null;BufferedReader r = new BufferedReader(reader);StringBuilder b = new StringBuilder();String line;while((line=r.readLine())!=null) {b.append(line);b.append(“\r\n”);}b.toString();FileUtils
View Code public class FileUtils {private String SDPATH;private int FILESIZE = 4 * 1024;public String getSDPATH() {return SDPATH; }public FileUtils() {// 得到当前外部存储设备的目录( /SDCARD ) SDPATH = Environment.getExternalStorageDirectory() + "/"; }/** * 在SD卡上创建文件 * * @param fileName * @return * @throws IOException*/public File createSDFile(String fileName) throws IOException { File file = new File(SDPATH + fileName); file.createNewFile();return file; }/** * 在SD卡上创建目录 * * @param dirName * @return*/public File createSDDir(String dirName) { File dir = new File(SDPATH + dirName); dir.mkdir();return dir; }/** * 判断SD卡上的文件夹是否存在 * * @param fileName * @return*/public boolean isFileExist(String fileName) { File file = new File(SDPATH + fileName);return file.exists(); }/** * 将一个InputStream里面的数据写入到SD卡中 * * @param path * @param fileName * @param input * @return*/public File write2SDFromInput(String path, String fileName, InputStream input) { File file = null; OutputStream output = null;try { createSDDir(path); file = createSDFile(path + fileName); output = new FileOutputStream(file);byte[] buffer = new byte[FILESIZE];while ((input.read(buffer)) != -1) { output.write(buffer); } output.flush(); } catch (Exception e) { e.printStackTrace(); } finally {try { output.close(); } catch (IOException e) { e.printStackTrace(); } }return file; }/** * 在sd卡中读出文本文件 返回String * strFullPath 读取文件的完整路径*/public String ReadSDFiled(String strFullPath) { File file = new File(SDPATH + strFullPath); InputStream in = null;try { in = new BufferedInputStream(new FileInputStream(file)); } catch (FileNotFoundException e3) { e3.printStackTrace(); } BufferedReader br = null;try {/* 转换编码 */ br = new BufferedReader(new InputStreamReader(in, "gb2312"));/* 不转换编码 */// br = new BufferedReader(new InputStreamReader(in)); } catch (UnsupportedEncodingException e1) { e1.printStackTrace(); } StringBuffer sb = new StringBuffer(); String tmp;try {while ((tmp = br.readLine()) != null) { sb.append(tmp + "\n"); } br.close(); in.close(); } catch (IOException e) { e.printStackTrace(); }return sb.toString(); }}转载于:https://www.cnblogs.com/xiaobuild/archive/2011/08/24/2152140.html
