io

demo1/src/test/java/cn/freemud/demo/HomeworkTests.java

@@ -2,6 +2,7 @@ package cn.freemud.demo;
 
 import org.junit.Test;
 
+import java.io.*;
 import java.util.*;
 
 public class HomeworkTests {
@@ -63,4 +64,43 @@ public class HomeworkTests {
             System.out.print(a+" ");
     }
 
+    /**
+     * io 字节流
+     */
+    @Test
+    public void ioDemo(){
+        File file = new File("D:\\a.text");
+        try {
+            OutputStream os = new FileOutputStream(file);
+            String ts ="hello world!";
+            byte[] data =ts.getBytes();
+            os.write(data);
+        } catch (FileNotFoundException e) {
+            System.out.println("找不到文件");
+            e.printStackTrace();
+        } catch (IOException e) {
+            System.out.println("字节流输入文件错误");
+            e.printStackTrace();
+        }
+    }
+
+    /**
+     * 字符流
+     */
+    @Test
+    public void ioDemo1(){
+        File file = new File("D:\\b.text");
+        try {
+            FileWriter fs = new FileWriter(file);
+            String ts ="hello world,b.text!";
+            fs.write(ts);
+            /**
+             * 字符流的文件会存入到缓冲池里，要随用随关闭
+             */
+            fs.close();
+        } catch (IOException e) {
+            System.out.println("字符流输入文件错误");
+            e.printStackTrace();
+        }
+    }
 }