[4344] | 1 | package org.expressolivre.cte.common; |
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| 2 | |
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[4780] | 3 | import java.io.BufferedWriter; |
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[4344] | 4 | import java.io.File; |
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| 5 | import java.io.FileReader; |
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[4780] | 6 | import java.io.FileWriter; |
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[4344] | 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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[4780] | 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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[4344] | 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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