org.springframework.util.FileCopyUtils

输入

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// 从文件中读入到字节数组中 File file = new File("D:\\project\\intellij-git\\testgit\\src\\main\\webapp\\test-temporary\\test.txt"); byte[] bytes = FileCopyUtils.copyToByteArray(file); System.out.println(new String(bytes));//123 // 从输入流中读入到字节数组中 InputStream inputStream = new FileInputStream(file); byte[] bytes1 = FileCopyUtils.copyToByteArray(inputStream); System.out.println(new String(bytes1));//123 // 从输入流中读入到字符串中 Reader reader = new FileReader(file); String copyToString = FileCopyUtils.copyToString(reader); System.out.println(copyToString);//123

　　

输出

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// 从字节数组到文件 FileCopyUtils.copy("1234".getBytes(), file); // 从文件到文件 File file2 = new File("D:\\project\\intellij-git\\testgit\\src\\main\\webapp\\test-temporary\\test2.txt"); int copy = FileCopyUtils.copy(file, file2); System.out.println(copy);//4 // 从字节数组到输出流 OutputStream outputStream = new FileOutputStream(file2); FileCopyUtils.copy("1234".getBytes(), outputStream); // 从输入流到输出流 InputStream inputStream2 = new FileInputStream(file); OutputStream outputStream2 = new FileOutputStream(file2); int copy2 = FileCopyUtils.copy(inputStream2, outputStream2); System.out.println(copy2);//4 // 从输入流到输出流 Reader reader1 = new InputStreamReader(inputStream2); Writer writer = new OutputStreamWriter(outputStream2); int copy3 = FileCopyUtils.copy(reader1, writer); System.out.println(copy3);//4 // 从字符串到输出流 FileCopyUtils.copy("12345", writer);