1 | package org.expressolivre.cte.common; |
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2 | |
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3 | import java.io.BufferedWriter; |
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4 | import java.io.File; |
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5 | import java.io.FileReader; |
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6 | import java.io.FileWriter; |
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7 | import java.io.IOException; |
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8 | import java.io.InputStream; |
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9 | import java.io.InputStreamReader; |
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10 | import java.io.Reader; |
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11 | import java.net.URL; |
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12 | |
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13 | /** |
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14 | * @author L.F.Estivalet (Serpro) |
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15 | * |
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16 | * Created on May 9, 2011 at 2:43:28 PM |
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17 | * |
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18 | */ |
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19 | public class IOUtil { |
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20 | |
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21 | /** |
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22 | * Open and write contents to a file. |
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23 | * |
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24 | * @param fileName |
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25 | * the name of the file. |
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26 | * @param contents |
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27 | * contents to be written. |
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28 | * @param append |
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29 | * if <code>true</code> contents will be appended to previous |
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30 | * contents of the file. If <code>false</code> a brand new file |
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31 | * is created to write the contents. |
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32 | * @throws IOException |
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33 | * Thrown whenever a problem in the underlying file system |
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34 | * happens. |
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35 | */ |
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36 | public static void writeFile(String fileName, String contents, |
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37 | Boolean append) throws IOException { |
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38 | BufferedWriter out = new BufferedWriter( |
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39 | new FileWriter(fileName, append)); |
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40 | out.write(contents); |
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41 | out.close(); |
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42 | } |
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43 | |
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44 | /** |
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45 | * Read the entire contents of the specified file and return a single String |
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46 | * object containing the contents of the file. |
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47 | * |
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48 | * @param fileName |
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49 | * the name of the file from which to read |
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50 | * |
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51 | * @return a String containing the contents of the input file |
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52 | * |
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53 | * @throws IOException |
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54 | * if the specified file cannot be opened, or if an I/O error |
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55 | * occurs while reading the file |
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56 | */ |
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57 | public static String readFully(String fileName) throws IOException { |
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58 | return readFully(new File(fileName)); |
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59 | } |
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60 | |
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61 | /** |
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62 | * Read the entire contents of the specified file and return a single String |
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63 | * object containing the contents of the file. This method does not return |
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64 | * until the end of the input file is reached. |
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65 | * |
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66 | * @param file |
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67 | * a File from which to read |
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68 | * |
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69 | * @return a String containing the contents of the input file |
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70 | * |
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71 | * @throws IOException |
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72 | * if the specified file cannot be opened, or if an I/O error |
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73 | * occurs while reading the file |
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74 | */ |
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75 | public static String readFully(File file) throws IOException { |
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76 | return readFully(new FileReader(file)); |
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77 | } |
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78 | |
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79 | /** |
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80 | * Read the entire contents of the specified URL and return a single String |
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81 | * object containing the contents of the URL. This method does not return |
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82 | * until an end of stream is reached for the URL. |
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83 | * |
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84 | * @param url |
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85 | * a URL from which to read |
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86 | * |
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87 | * @return a String containing the contents of the input URL |
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88 | * |
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89 | * @throws IOException |
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90 | * if the specified URL cannot be opened, or if an I/O error |
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91 | * occurs while reading the URL |
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92 | */ |
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93 | public static String readFully(URL url) throws IOException { |
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94 | return readFully(url.openStream()); |
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95 | } |
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96 | |
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97 | /** |
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98 | * Read the entire contents of the specified InputStream and return a single |
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99 | * String object containing the contents of the InputStream. This method |
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100 | * does not return until the end of the input stream is reached. |
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101 | * |
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102 | * @param stream |
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103 | * an InputStream from which to read |
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104 | * |
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105 | * @return a String containing the contents of the input stream |
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106 | * |
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107 | * @throws IOException |
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108 | * if an I/O error occurs while reading the input stream |
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109 | */ |
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110 | public static String readFully(InputStream stream) throws IOException { |
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111 | return readFully(new InputStreamReader(stream)); |
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112 | } |
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113 | |
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114 | /** |
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115 | * Read the entire contents of the specified Reader and return a single |
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116 | * String object containing the contents of the InputStream. This method |
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117 | * does not return until the end of the input file or stream is reached. |
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118 | * |
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119 | * @param reader |
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120 | * a Reader from which to read |
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121 | * |
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122 | * @return a String containing the contents of the stream |
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123 | * |
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124 | * @throws IOException |
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125 | * if an I/O error occurs while reading the input stream |
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126 | */ |
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127 | public static String readFully(Reader reader) throws IOException { |
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128 | char[] arr = new char[8 * 1024]; // 8K at a time |
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129 | StringBuffer buf = new StringBuffer(); |
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130 | int numChars; |
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131 | |
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132 | while ((numChars = reader.read(arr, 0, arr.length)) > 0) { |
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133 | buf.append(arr, 0, numChars); |
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134 | } |
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135 | |
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136 | return buf.toString(); |
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137 | } |
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138 | |
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139 | /** |
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140 | * Do not construct an instance of this class. |
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141 | */ |
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142 | private IOUtil() { |
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143 | } |
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144 | } |
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