add thread stream

src/main/java/com/example/demo/controller/StreamController.java

+package com.example.demo.controller;
+
+import org.springframework.web.bind.annotation.*;
+import org.springframework.web.multipart.MultipartFile;
+
+import java.io.*;
+
+/**
+ * 数据流
+ */
+@RestController
+@RequestMapping("/")
+public class StreamController {
+
+    /**
+     * 字符数据流
+     */
+    @GetMapping("/character")
+    public void characterDemo() throws IOException {
+        //CharArrayWriter用来接收数据
+        CharArrayWriter charArrayWriter = new CharArrayWriter();
+        charArrayWriter.write("cat1"); //可以是字符串或者下面的字节数组
+        char[] char01 = {'c','a','t','2'};
+        charArrayWriter.write(char01);
+
+        char[] char02 = charArrayWriter.toCharArray(); //转字符数组
+        System.out.print(char02);
+        System.out.print("\r\n");
+        CharArrayReader charArrayReader = new CharArrayReader(char02);
+        CharArrayReader reader = new CharArrayReader(char02);
+        while (charArrayReader.read() != -1){ //读数据
+            System.out.print((char) reader.read());
+        }
+        System.out.print("\r\n");
+
+        //推荐使用
+        BufferedReader bufferedReader = new BufferedReader(new CharArrayReader(char02));
+        System.out.print(bufferedReader.readLine());
+    }
+
+
+    /**
+     * 字节数据流&文件流
+     */
+    @PostMapping("/byte")
+    public void byteDemo(@RequestPart @RequestParam("file") MultipartFile file) throws IOException {
+        String filename = file.getOriginalFilename(); //获取文件名
+        byte[] fileContent = file.getBytes();
+        FileOutputStream fileOutputStream = new FileOutputStream("test.txt");
+        fileOutputStream.write(fileContent); //写入
+        fileOutputStream.close(); //关闭
+
+        File file2 = new File("test2.txt");
+        File file2rename = new File("test2rename.txt");
+        file2.renameTo(file2rename);
+
+        if(file2.createNewFile() == false){
+            System.out.print("文件新建失败");
+        }
+        file2.delete(); //删除
+    }
+
+}

src/main/java/com/example/demo/controller/ThreadController.java

+package com.example.demo.controller;
+
+import com.example.demo.tool.Task;
+import com.example.demo.tool.TaskRunnable;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+/**
+ * 多线程
+ */
+@RestController
+@RequestMapping("/")
+public class ThreadController {
+
+    @GetMapping("/thread")
+    public void threadDemo(){
+        Task thread1 = new Task();
+        Task thread2 = new Task();
+        Task thread3 = new Task();
+        thread1.setName("task1");
+        thread2.setName("task2");
+        thread3.setName("task3");
+
+        thread1.start();
+        thread2.start();
+        thread3.start();
+    }
+
+    @GetMapping("/runnable")
+    public void runnableDemo(){
+        TaskRunnable taskRunnable = new TaskRunnable();
+        Thread thread1 = new Thread(taskRunnable,"task1");
+        Thread thread2 = new Thread(taskRunnable,"task2");
+        Thread thread3 = new Thread(taskRunnable,"task3");
+
+        thread1.start();
+        thread2.start();
+        thread3.start();
+    }
+
+}

src/main/java/com/example/demo/tool/Task.java

+package com.example.demo.tool;
+
+import lombok.SneakyThrows;
+
+public class Task extends Thread {
+
+    int count = 0;
+
+    @SneakyThrows
+    @Override
+    public  void run() {
+        while (true){
+            if(count > 5){
+                break;
+            }
+            System.out.print(this.getName() + ":" + String.valueOf(count) + "\r\n");
+            count ++;
+            Thread.sleep(500);
+        }
+        super.run();
+    }
+}

src/main/java/com/example/demo/tool/TaskRunnable.java

+package com.example.demo.tool;
+
+import lombok.SneakyThrows;
+
+/**
+ * 实现了Runnable接口
+ */
+public class TaskRunnable implements Runnable {
+
+    int count = 0;
+
+    @SneakyThrows
+    @Override
+    public synchronized void run() {
+        while (true){
+            if(count > 5){
+                break;
+            }
+            System.out.print(String.valueOf(count) + "\r\n");
+            count ++;
+            wait(500);
+        }
+    }
+}