基于SSM框架的实验室设备管理系统.zip

package com.testcase; import com.testcase.user01.Main; import org.springframework.util.ResourceUtils; import java.io.*; import java.text.SimpleDateFormat; import java.util.Date; /** * @Author WangZeng * @Date 2021-04-26 23:18 */ public class FileStreamTest { /** * 测试从classpath（resources)下加载资源 **/ public static void readFileAsStream() { // getContextClassLoader().getResourceAsStream()默认从classpath中找文件，文件放在resources目录下，name不能带“/”，否则会抛空指针 InputStream stream = Thread.currentThread().getContextClassLoader().getResourceAsStream("mybatis-config.xml"); BufferedInputStream bufferedInputStream = new BufferedInputStream(stream); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream)); try { String line = null; while ((line = bufferedReader.readLine()) != null) { System.out.println(line); } } catch (IOException e) { e.printStackTrace(); } } public static void writeProjectResourceTest() { String basePath = Thread.currentThread().getContextClassLoader().getResource("images").getPath(); try { String fileName = "hello.txt"; String filePath = basePath + "/" + fileName; System.out.println("path=" + basePath); //E:/GitSpace/github_space/devicemanage/target/classes/images BufferedWriter bufferedWriter = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(basePath + "/" + fileName))); //bufferedWriter.write("覆盖写入一行字符串"); bufferedWriter.write("覆盖方式写入一行字符串123456"); bufferedWriter.flush(); bufferedWriter.close(); } catch (FileNotFoundException e) { e.printStackTrace(); } catch (IOException e) { e.printStackTrace(); } } public static void appendWriteFileByBufferedWriter() { String filePath = "E:\\GitSpace\\github_space\\devicemanage\\src\\main\\resources\\images\\test.txt"; try { BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(filePath, true));//true,则追加写入text文本 String date = new SimpleDateFormat("yyyy-MM-dd HH-mm-ss.SSS").format(new Date()); bufferedWriter.write(date + " 追加写入一行记录"); //bufferedWriter.write("\r\n");//换行 bufferedWriter.newLine(); bufferedWriter.flush(); bufferedWriter.close(); } catch (IOException e) { e.printStackTrace(); } } public static void randomAccessFileTest() { String filePath = "C:\\Users\\Lenovo\\Desktop\\test\\text.txt"; try { RandomAccessFile randomAccessFile = new RandomAccessFile(filePath, "rw"); long fileLength = randomAccessFile.length(); randomAccessFile.seek(fileLength); String content = new Date().toString()+"追加写入一行数据\n"; randomAccessFile.writeUTF(content); randomAccessFile.close(); } catch (Exception e) { e.printStackTrace(); } try { RandomAccessFile randomAccessFile = new RandomAccessFile(filePath, "r"); String line = null; try { //写入时使用writeUTF，读取时就需要使用readUTF，否则乱码 line = randomAccessFile.readUTF(); } catch (IOException e) { e.printStackTrace(); } System.out.println("读取一行数据："+line); try { randomAccessFile.close(); } catch (IOException e) { e.printStackTrace(); } } catch (FileNotFoundException e) { e.printStackTrace(); } } public static void readProjectResourcesTest() { InputStream inputStream = Thread.currentThread().getContextClassLoader().getResourceAsStream("images/test.txt"); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream)); String line = null; try { line = bufferedReader.readLine(); System.out.println(line); } catch (IOException e) { e.printStackTrace(); } } public static void getProjectPathTest() { String classesPath = Main.class.getResource("/").getPath(); System.out.println("classesPath=" + classesPath); //输出：classesPath=/E:/GitSpace/github_space/devicemanage/target/classes/ try { String path = ResourceUtils.getURL("classpath:").getPath(); System.out.println("classesPath-2=" + path); //输出：classesPath-2=/E:/GitSpace/github_space/devicemanage/target/classes/ File file = new File(path).getParentFile().getParentFile(); System.out.println("projectRootPath=" + file.getAbsolutePath()); //输出：projectRootPath=E:\GitSpace\github_space\devicemanage } catch (FileNotFoundException e) { e.printStackTrace(); } } /** * 测试从当前包下加载资源 **/ public static void readFileAsStreamTest() { // class.getResourceAsStream()指定一个文件名，用于读取当前包下的一个文件 InputStream stream = Main.class.getResourceAsStream("user-mapper.xml"); BufferedInputStream bufferedInputStream = new BufferedInputStream(stream); BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(stream)); try { String line = null; while ((line = bufferedReader.readLine()) != null) { System.out.println(line); } } catch (IOException e) { e.printStackTrace(); } } public static void fileStreamTest() { // 创建文件对象 File file = new File("io_file/temp.txt"); if (!file.exists()) { //不存在则创建,不要使用file.mkdirs(),不然创建的temp.txt就变成文件夹了 ////默认项目根目录下 file.getParentFile().mkdirs(); System.out.println("创建文件夹"); } try { //文件写入：创建文件输出流，追加写入 FileOutputStream out = new FileOutputStream(file,true); String text = "梦想天空：dream of flying the sky"; // 创建byte型数组，text.getBytes("utf-8")设置所用文件的编码 byte bytes[] = text.getBytes(); // 将数组中信息写入到文件中 out.write(bytes); out.close(); } catch (Exception e) { e.printStackTrace(); } try { //读取文件： 创建文件输入流 FileInputStream in = new FileInputStream(file); byte byt[] = new byte[1024]; int len = -1; // 将文件中信息输出 while((len = in.read(byt))!= -1){ System.out.println(new String(byt, 0, len)); } in.close(); } catch (Exception e) { e.printStackTrace(); } } public static void outputStreamWriterAndReaderTest() { File file = new File("C:\\Users\\Lenovo\\Desktop\\test\\text.txt"); //文件写入 try { OutputStreamWriter outputStreamWriter = null; outputStreamWriter = new OutputStreamWriter(new FileOutputStream(file), "utf-8"); BufferedWriter bufferedWriter = new BufferedWriter(outputStreamWriter); try { String content = "文本中的一行记录"; bufferedWriter.write(content); System.out.println("正在写入：" + content); //buffered