IO相关测试代码

qui910 · qui910 · commit e1ce8c8a0530 · 2020-07-20T00:26:59.000+08:00
diff --git a/pom.xml b/pom.xml
@@ -19,9 +19,10 @@
   <dependencies>
     <dependency>
       <groupId>junit</groupId>
+      <!-- JUnit入门-1.在IDEA创建JUnit测试用例 https://zhuanlan.zhihu.com/p/42453559-->
       <artifactId>junit</artifactId>
       <version>4.11</version>
-      <scope>test</scope>
+      <scope>compile</scope> <!-- IDEA下maven工程找不到@Test https://blog.csdn.net/seudongnan/article/details/78268508-->
     </dependency>
       <dependency>
         <groupId>org.projectlombok</groupId>
diff --git a/src/main/java/com/prd/io/nio/NIOFileCopyTest.java b/src/main/java/com/prd/io/nio/NIOFileCopyTest.java
@@ -51,8 +51,13 @@ public void  testNIOByTransferFrom() throws IOException {
         FileChannel inChannel = FileChannel.open(Paths.get("E:\\a.zip"), StandardOpenOption.READ);
         FileChannel outChennel = FileChannel.open(Paths.get("D:\\b.zip"),StandardOpenOption.WRITE,
                 StandardOpenOption.READ,StandardOpenOption.CREATE_NEW);
-        outChennel.transferFrom(inChannel,0,inChannel.size());
+//        outChennel.transferFrom(inChannel,0,inChannel.size());
 
+        // 加个while循环，保证全部数据都拷贝完成
+        long transferred = 0; //已拷贝的字节数
+        while (transferred!=inChannel.size()) {
+            transferred+=inChannel.transferTo(0,inChannel.size(),outChennel);
+        }
         long end = System.currentTimeMillis();
         // 复制文件所需的时间：29362
         System.out.println("复制文件所需的时间：" + (end - startTime));
@@ -108,7 +113,9 @@ public void testNIOByChannel()throws IOException {
         //将通道中的数据存入缓冲区
         while (inChannel.read(buf) != -1) {
             buf.flip();//切换读取数据的模式
-            outChanel.write(buf);
+            while(buf.hasRemaining()) {
+                outChanel.write(buf);
+            }
             buf.clear();
         }
         outChanel.close();
