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| 1 | +package org.example; |
| 2 | + |
| 3 | +import java.io.*; |
| 4 | +import java.util.Scanner; |
| 5 | + |
| 6 | +/** |
| 7 | + * @author Whoopsunix |
| 8 | + */ |
| 9 | +public class FileRead { |
| 10 | + /** |
| 11 | + * abstract java.io.Reader |
| 12 | + * java.io.InputStreamReader |
| 13 | + * 自带的 read() |
| 14 | + */ |
| 15 | + public String read_InputStreamReader(String filePath) throws Exception { |
| 16 | + FileInputStream fileInputStream = new FileInputStream(filePath); |
| 17 | + InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream); |
| 18 | + int character; |
| 19 | + StringBuilder content = new StringBuilder(); |
| 20 | + while ((character = inputStreamReader.read()) != -1) { |
| 21 | + // 处理读取到的字符 |
| 22 | + char charValue = (char) character; |
| 23 | + content.append(charValue); |
| 24 | + } |
| 25 | + inputStreamReader.close(); |
| 26 | + |
| 27 | + return content.toString(); |
| 28 | + } |
| 29 | + |
| 30 | + /** |
| 31 | + * abstract java.io.Reader |
| 32 | + * java.io.InputStreamReader |
| 33 | + * java.io.BufferedReader |
| 34 | + */ |
| 35 | + public String read_InputStreamReader_BufferedReader(String filePath) throws Exception { |
| 36 | + FileInputStream fileInputStream = new FileInputStream(filePath); |
| 37 | + InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream); |
| 38 | + BufferedReader bufferedReader = new BufferedReader(inputStreamReader); |
| 39 | + String line; |
| 40 | + StringBuilder content = new StringBuilder(); |
| 41 | + while ((line = bufferedReader.readLine()) != null) { |
| 42 | + content.append(line).append("\n"); |
| 43 | + } |
| 44 | + bufferedReader.close(); |
| 45 | + return content.toString(); |
| 46 | + } |
| 47 | + |
| 48 | + public String read_InputStreamReader_CharArrayReader(String filePath) throws Exception { |
| 49 | + FileInputStream fileInputStream = new FileInputStream(filePath); |
| 50 | + InputStreamReader inputStreamReader = new InputStreamReader(fileInputStream); |
| 51 | + char[] charArray = new char[1024]; |
| 52 | + int bytesRead = inputStreamReader.read(charArray); |
| 53 | + CharArrayReader charArrayReader = new CharArrayReader(charArray, 0, bytesRead); |
| 54 | + |
| 55 | + int character; |
| 56 | + StringBuilder content = new StringBuilder(); |
| 57 | + while ((character = charArrayReader.read()) != -1) { |
| 58 | + // 处理读取到的字符 |
| 59 | + content.append((char) character); |
| 60 | + } |
| 61 | + charArrayReader.close(); |
| 62 | + return content.toString(); |
| 63 | + } |
| 64 | + |
| 65 | + |
| 66 | + /** |
| 67 | + * 对照组 |
| 68 | + */ |
| 69 | + public String read_InputStreamReader_text(String str) throws Exception { |
| 70 | + InputStream inputStream = new ByteArrayInputStream(str.getBytes()); |
| 71 | + |
| 72 | + InputStreamReader inputStreamReader = new InputStreamReader(inputStream); |
| 73 | + BufferedReader bufferedReader = new BufferedReader(inputStreamReader); |
| 74 | + String line; |
| 75 | + StringBuilder content = new StringBuilder(); |
| 76 | + while ((line = bufferedReader.readLine()) != null) { |
| 77 | + content.append(line).append("\n"); |
| 78 | + } |
| 79 | + bufferedReader.close(); |
| 80 | + return content.toString(); |
| 81 | + } |
| 82 | + |
| 83 | + // java.io.FileInputStream |
| 84 | + public String read_FileInputStream(String filePath) { |
| 85 | + String content = ""; |
| 86 | + try { |
| 87 | + FileInputStream fileInputStream = new FileInputStream(filePath); |
| 88 | + byte[] data = new byte[fileInputStream.available()]; |
| 89 | + fileInputStream.read(data); |
| 90 | + fileInputStream.close(); |
| 91 | + content = new String(data, "UTF-8"); |
| 92 | + System.out.println(content); |
| 93 | + } catch (Exception e) { |
| 94 | + |
| 95 | + } |
| 96 | + return content; |
| 97 | + } |
| 98 | + |
| 99 | + /** |
| 100 | + * FileReader |
| 101 | + */ |
| 102 | + // java.io.BufferedReader.readLine() |
| 103 | + public String read_FileReader_bufferedReader1(String filePath) throws Exception { |
| 104 | + StringBuilder content = new StringBuilder(); |
| 105 | + FileReader reader = new FileReader(filePath); |
| 106 | + BufferedReader bufferedReader = new BufferedReader(reader); |
| 107 | + String line; |
| 108 | + while ((line = bufferedReader.readLine()) != null) { |
| 109 | + content.append(line).append("\n"); |
| 110 | + } |
| 111 | + bufferedReader.close(); |
| 112 | + |
| 113 | + return content.toString(); |
| 114 | + } |
| 115 | + |
| 116 | + // java.io.BufferedReader.read() |
| 117 | + public String read_FileReader_bufferedReader2(String filePath) throws Exception { |
| 118 | + StringBuilder content = new StringBuilder(); |
| 119 | + FileReader reader = new FileReader(filePath); |
| 120 | + BufferedReader bufferedReader = new BufferedReader(reader); |
| 121 | + int character; |
| 122 | + while ((character = bufferedReader.read()) != -1) { |
| 123 | + // 处理读取到的字符 |
| 124 | + char charValue = (char) character; |
| 125 | + content.append(charValue); |
| 126 | + } |
| 127 | + bufferedReader.close(); |
| 128 | + |
| 129 | + return content.toString(); |
| 130 | + } |
| 131 | + |
| 132 | + // java.io.FileReader.read() |
| 133 | + // 不套其他 直接通过 FileReader 读取 |
| 134 | + public String read_FileReader(String filePath) throws Exception { |
| 135 | + StringBuilder content = new StringBuilder(); |
| 136 | + FileReader reader = new FileReader(filePath); |
| 137 | + int character; |
| 138 | + while ((character = reader.read()) != -1) { |
| 139 | + // 处理读取到的字符 |
| 140 | + char charValue = (char) character; |
| 141 | + content.append(charValue); |
| 142 | + } |
| 143 | + reader.close(); |
| 144 | + |
| 145 | + return content.toString(); |
| 146 | + } |
| 147 | + |
| 148 | + // java.io.LineNumberReader.read() |
| 149 | + public String read_FileReader_LineNumberReader(String filePath) throws Exception { |
| 150 | + StringBuilder content = new StringBuilder(); |
| 151 | + FileReader reader = new FileReader(filePath); |
| 152 | + LineNumberReader lineNumberReader = new LineNumberReader(reader); |
| 153 | + String line; |
| 154 | + while ((line = lineNumberReader.readLine()) != null) { |
| 155 | + content.append(line).append("\n"); |
| 156 | + } |
| 157 | + lineNumberReader.close(); |
| 158 | + |
| 159 | + return content.toString(); |
| 160 | + } |
| 161 | + |
| 162 | + // java.io.CharArrayReader.read() |
| 163 | + public String read_FileReader_CharArrayReader(String filePath) throws Exception { |
| 164 | + StringBuilder content = new StringBuilder(); |
| 165 | + |
| 166 | + FileReader reader = new FileReader(filePath); |
| 167 | + char[] charArray = new char[1024]; |
| 168 | + int bytesRead = reader.read(charArray); |
| 169 | + CharArrayReader charArrayReader = new CharArrayReader(charArray, 0, bytesRead); |
| 170 | + |
| 171 | + int character; |
| 172 | + while ((character = charArrayReader.read()) != -1) { |
| 173 | + // 处理读取到的字符 |
| 174 | + char charValue = (char) character; |
| 175 | + content.append(charValue); |
| 176 | + } |
| 177 | + |
| 178 | + return content.toString(); |
| 179 | + } |
| 180 | + |
| 181 | + // java.io.PushbackReader |
| 182 | + public String read_PushbackReader(String filePath) throws Exception { |
| 183 | + StringBuilder content = new StringBuilder(); |
| 184 | + FileReader reader = new FileReader(filePath); |
| 185 | + PushbackReader pushbackReader = new PushbackReader(reader); |
| 186 | + int character; |
| 187 | + while ((character = pushbackReader.read()) != -1) { |
| 188 | + // 处理读取到的字符 |
| 189 | + char charValue = (char) character; |
| 190 | + content.append(charValue); |
| 191 | + } |
| 192 | + pushbackReader.close(); |
| 193 | + |
| 194 | + return content.toString(); |
| 195 | + } |
| 196 | + |
| 197 | + /** |
| 198 | + * Files |
| 199 | + */ |
| 200 | + // java.nio.file.Files.readAllBytes() |
| 201 | + public String read_Files_readAllBytes(String filePath) throws Exception { |
| 202 | + byte[] data = java.nio.file.Files.readAllBytes(java.nio.file.Paths.get(filePath)); |
| 203 | + return new String(data, "UTF-8"); |
| 204 | + } |
| 205 | + |
| 206 | + // java.nio.file.Files.readAllLines() |
| 207 | + public String read_Files_readAllLines(String filePath) throws Exception { |
| 208 | + StringBuilder content = new StringBuilder(); |
| 209 | + java.util.List<String> lines = java.nio.file.Files.readAllLines(java.nio.file.Paths.get(filePath)); |
| 210 | + for (String line : lines) { |
| 211 | + content.append(line).append("\n"); |
| 212 | + } |
| 213 | + return content.toString(); |
| 214 | + } |
| 215 | + |
| 216 | + /** |
| 217 | + * Scanner |
| 218 | + */ |
| 219 | + // java.util.Scanner |
| 220 | + public String read_Scanner_File(String filePath) throws Exception { |
| 221 | + StringBuilder content = new StringBuilder(); |
| 222 | + Scanner scanner = new Scanner(new File(filePath)); |
| 223 | + while (scanner.hasNextLine()) { |
| 224 | + content.append(scanner.nextLine()).append("\n"); |
| 225 | + } |
| 226 | + scanner.close(); |
| 227 | + return content.toString(); |
| 228 | + } |
| 229 | + |
| 230 | + // java.util.Scanner |
| 231 | + public String read_Scanner_Path(String filePath) throws Exception { |
| 232 | + StringBuilder content = new StringBuilder(); |
| 233 | + Scanner scanner = new Scanner(java.nio.file.Paths.get(filePath)); |
| 234 | + while (scanner.hasNextLine()) { |
| 235 | + content.append(scanner.nextLine()).append("\n"); |
| 236 | + } |
| 237 | + scanner.close(); |
| 238 | + return content.toString(); |
| 239 | + } |
| 240 | + |
| 241 | + /** |
| 242 | + * java.io.RandomAccessFile |
| 243 | + * readLine() |
| 244 | + */ |
| 245 | + public String read_RandomAccessFile_readLine(String filePath) throws Exception { |
| 246 | + RandomAccessFile randomAccessFile = new RandomAccessFile(filePath, "r"); |
| 247 | + StringBuilder content = new StringBuilder(); |
| 248 | + String line; |
| 249 | + // read() |
| 250 | + while ((line = randomAccessFile.readLine()) != null) { |
| 251 | + content.append(line).append("\n"); |
| 252 | + } |
| 253 | + |
| 254 | + randomAccessFile.close(); |
| 255 | + return content.toString(); |
| 256 | + } |
| 257 | + |
| 258 | + /** |
| 259 | + * java.io.RandomAccessFile |
| 260 | + * read() |
| 261 | + */ |
| 262 | + public String read_RandomAccessFile_read(String filePath) throws Exception { |
| 263 | + RandomAccessFile randomAccessFile = new RandomAccessFile(filePath, "r"); |
| 264 | + StringBuilder content = new StringBuilder(); |
| 265 | + int character; |
| 266 | + // read() |
| 267 | + while ((character = randomAccessFile.read()) != -1) { |
| 268 | + // 处理读取到的字符 |
| 269 | + char charValue = (char) character; |
| 270 | + content.append(charValue); |
| 271 | + } |
| 272 | + |
| 273 | + randomAccessFile.close(); |
| 274 | + return content.toString(); |
| 275 | + } |
| 276 | + |
| 277 | + // java.nio.channels.FileChannel |
| 278 | + public String read_FileChannel(String filePath) throws Exception { |
| 279 | + StringBuilder content = new StringBuilder(); |
| 280 | + FileInputStream fileInputStream = new FileInputStream(filePath); |
| 281 | + java.nio.channels.FileChannel fileChannel = fileInputStream.getChannel(); |
| 282 | + java.nio.ByteBuffer byteBuffer = java.nio.ByteBuffer.allocate(1024); |
| 283 | + while (fileChannel.read(byteBuffer) > 0) { |
| 284 | + byteBuffer.flip(); |
| 285 | + content.append(new String(byteBuffer.array(), 0, byteBuffer.limit())); |
| 286 | + byteBuffer.clear(); |
| 287 | + } |
| 288 | + fileChannel.close(); |
| 289 | + fileInputStream.close(); |
| 290 | + return content.toString(); |
| 291 | + } |
| 292 | + |
| 293 | + // java.nio.channels.FileChannel.open |
| 294 | + public String read_FileChannel_open(String filePath) throws Exception { |
| 295 | + StringBuilder content = new StringBuilder(); |
| 296 | + java.nio.channels.FileChannel fileChannel = java.nio.channels.FileChannel.open(java.nio.file.Paths.get(filePath)); |
| 297 | + java.nio.ByteBuffer byteBuffer = java.nio.ByteBuffer.allocate(1024); |
| 298 | + while (fileChannel.read(byteBuffer) > 0) { |
| 299 | + byteBuffer.flip(); |
| 300 | + content.append(new String(byteBuffer.array(), 0, byteBuffer.limit())); |
| 301 | + byteBuffer.clear(); |
| 302 | + } |
| 303 | + fileChannel.close(); |
| 304 | + return content.toString(); |
| 305 | + } |
| 306 | + |
| 307 | + /** |
| 308 | + * org.apache.commons.io.FileUtils |
| 309 | + */ |
| 310 | + public String read_FileUtils(String filePath) throws Exception { |
| 311 | + return org.apache.commons.io.FileUtils.readFileToString(new File(filePath), "UTF-8"); |
| 312 | + } |
| 313 | +} |
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