15、关于String,File,InputStream之间的相互转换

喜欢ヅ旅行 2022-07-16 05:54 223阅读 0赞

1、介绍了关于String,File,InputStream之间的相互转换

1.1  String2InputStream

/**
    	 * String2InputStream(String str)的工具方法
    	 * 
    	 * @param str
    	 *            需要转换的字符串str
    	 * @return 返回的是字符串str转换为inputstream的结果
    	 */
    	public static InputStream String2InputStream(String str) {
    		ByteArrayInputStream stream = new ByteArrayInputStream(str.getBytes());
    		return stream;
    	}

1.2  inputStream2String(InputStream is)  ;  String inputStream2String(InputStream is, String charset)

/**
    	 * inputStream2String(InputStream is)
    	 * 
    	 * @param is
    	 *            输入流InputStream is
    	 * @return 输入流InputStream is转换为的String
    	 */
    	public static String inputStream2String(InputStream is) {
    		StringBuffer buffer = null;
    		BufferedReader in = null;
    		try {
    			in = new BufferedReader(new InputStreamReader(is));
    			buffer = new StringBuffer();
    			String line = "";
    			while ((line = in.readLine()) != null) {
    				buffer.append(line);
    			}
    		} catch (Exception e) {
    			throw new RuntimeException(
    					"在调用Utils.inputStream2String(InputStream is)发生异常！！！");
    		}
    		return buffer.toString();
    	}
    
    	/**
    	 * inputStream2String(InputStream is, String charset)
    	 * 
    	 * @param is
    	 *            输入流InputStream is
    	 * @param charset
    	 *            字符集String charset
    	 * @return 输入流InputStream is,字符集String charset转换为的String
    	 */
    	public static String inputStream2String(InputStream is, String charset) {
    		ByteArrayOutputStream baos = null;
    		try {
    			baos = new ByteArrayOutputStream();
    			byte data[] = new byte[1024];
    			int len = -1;
    			while ((len = is.read(data)) != -1) {
    				baos.write(data, 0, len);
    			}
    			String a = baos.toString(charset);
    			return baos.toString(charset);
    		} catch (IOException e) {
    			throw new RuntimeException(
    					"在调用Utils.inputStream2String(InputStream is,String charset)发生异常！！！");
    		} finally {
    			if (null != baos) {
    				try {
    					baos.close();
    				} catch (IOException e) {
    					throw new RuntimeException(
    							"在调用Utils.inputStream2String(InputStream is, String charset)发生异常！！！");
    				}
    				baos = null;
    			}
    		}
    	}

1.3  file2InputStream

/**
    	 * file2InputStream(File file)
    	 * 
    	 * @param file
    	 *            文件 File file
    	 * @return 文件File转换为的InputStream
    	 */
    	public static InputStream file2InputStream(File file) {
    		InputStream in = null;
    		try {
    			in = new FileInputStream(file);
    			return in;
    		} catch (FileNotFoundException e) {
    			throw new RuntimeException(
    					"在调用Utils.file2InputStream(File file)发生异常！！！");
    		}
    
    	}
    
    	/**
    	 * file2InputStream(String filenPath)
    	 * 
    	 * @param filenPath
    	 *            文件 File的具体路径
    	 * @return 文件File转换为的InputStream
    	 */
    
    	public static InputStream file2InputStream(String filenPath) {
    		InputStream in = null;
    		File file = null;
    		try {
    			file = new File(filenPath);
    			in = new FileInputStream(file);
    			return in;
    		} catch (FileNotFoundException e) {
    			throw new RuntimeException(
    					"在调用Utils.file2InputStream(String filenPath)发生异常！！！");
    		}
    
    	}

1.4  inputstreamtofile

/**
    	 * inputstreamtofile(InputStream ins, File file)
    	 * 
    	 * @param ins
    	 *            输入流InputStream ins
    	 * @param file
    	 *            输入流InputStream ins转换的文件
    	 */
    	public static void inputstreamtofile(InputStream ins, File file) {
    		OutputStream os = null;
    		try {
    			os = new FileOutputStream(file);
    			int bytesRead = 0;
    			byte[] buffer = new byte[1024];
    			while ((bytesRead = ins.read(buffer)) != -1) {
    				os.write(buffer, 0, bytesRead);
    			}
    		} catch (Exception e) {
    			throw new RuntimeException(
    					"在调用Utils.inputstreamtofile(InputStream ins, File file)发生异常！！！");
    		} finally {
    			try {
    				if (os != null)
    					os.close();
    				if (ins != null) {
    					ins.close();
    				}
    			} catch (IOException e) {
    				throw new RuntimeException(
    						"在调用Utils.inputstreamtofile(InputStream ins, File file)发生异常！！！");
    			}
    
    		}
    
    	}
    
    	public static void inputstreamtofile(InputStream ins, String filePath) {
    		OutputStream os = null;
    		File file = null;
    		try {
    			file = new File(filePath);
    			os = new FileOutputStream(file);
    			int bytesRead = 0;
    			byte[] buffer = new byte[1024];
    			while ((bytesRead = ins.read(buffer)) != -1) {
    				os.write(buffer, 0, bytesRead);
    			}
    		} catch (Exception e) {
    			throw new RuntimeException(
    					"在调用Utils.inputstreamtofile(InputStream ins, File file)发生异常！！！");
    		} finally {
    			try {
    				if (os != null)
    					os.close();
    				if (ins != null) {
    					ins.close();
    				}
    			} catch (IOException e) {
    				throw new RuntimeException(
    						"在调用Utils.inputstreamtofile(InputStream ins, File file)发生异常！！！");
    			}
    
    		}
    
    	}