add Tests

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

@@ -11,6 +11,8 @@ import org.junit.Assert;
 import org.junit.Test;
 
 import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
 import java.io.IOException;
 import java.nio.charset.Charset;
 import java.util.List;
@@ -23,21 +25,15 @@ public class IOTests {
     public void Test(){
 
         String content = "this is test file.";
-        String fileName = "D:/java-traning/test1.md";
+        String fileName = "D:/java-training/test1.md";
         checkNotNull(fileName,"test fileName must not be null.");
 
         File testFile = new File(fileName);
         try {
-
-            // write file.
-            if(testFile.isDirectory()){
+            Files.createParentDirs(testFile);
             if(testFile.exists()){
                 testFile.delete();
             }
-            }
-            else{
-                testFile.mkdirs();
-            }
             Files.write(content,testFile, Charsets.UTF_8);
 
             // read file
@@ -45,6 +41,83 @@ public class IOTests {
             String readFileContent = Joiner.on("\r\n").join(Files.readLines(testFile,Charsets.UTF_8));
 
             Assert.assertEquals(content,readFileContent);
+
+            // read file use fileInputStream
+            FileInputStream fileInputStream = null;
+            String fileInputStreamContent = "";
+            try {
+                fileInputStream = new FileInputStream(testFile);
+                byte bytes[]=new byte[1024];
+                int n=0;//中间变量，记录实际读入的字节总数
+                //循环读取
+                while((n=fileInputStream.read(bytes))!=-1) {
+                    //read方法：read(byte[] b),最多读取b.length个字节，返回值是实际读入缓冲区的字节总数，
+                    //当没有更多的数据时。返回-1
+
+                    fileInputStreamContent=new String(bytes,0,n);//表示从0~读入的总字节数
+                    System.out.println(fileInputStreamContent);
+                }
+            } catch (Exception e) {
+                e.printStackTrace();
+            }finally {
+                //关闭文件流，必须放在这里。
+                try {
+                    fileInputStream.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            Assert.assertEquals(fileInputStreamContent,content);
+
+            String copyFileName = "D:/java-training/test1_copy.md";
+            String copyFileName2 = "D:/java-training/test1_copy2.md";
+            File copyFile = new File(copyFileName);
+            File copyFile2 = new File(copyFileName2);
+            copyFile.delete();
+            copyFile2.delete();
+
+            FileOutputStream fileOutputStream = null;
+            try {
+                Files.createParentDirs(copyFile);
+                fileOutputStream = new FileOutputStream(copyFile);
+                fileOutputStream.write(content.getBytes());
+                fileOutputStream.flush();
+            }catch (IOException e){
+                e.printStackTrace();
+            }finally {
+                //关闭文件流
+                try {
+                    fileOutputStream.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            FileOutputStream fos = null;
+            try {
+                FileInputStream fis = new FileInputStream(testFile);
+                fos = new FileOutputStream(copyFileName2);
+                byte[] buf = new byte[fis.available()];
+                fis.read(buf);
+
+                fos.write(buf);
+                fos.flush();
+            } catch (Exception e) {
+                e.printStackTrace();
+            }finally {
+                //关闭文件流
+                try {
+                    fos.close();
+                } catch (IOException e) {
+                    e.printStackTrace();
+                }
+            }
+
+            Assert.assertTrue(new File(copyFileName).exists());
+            Assert.assertTrue(new File(copyFileName2).exists());
+
+
         }
         catch (IOException fileIoEx){
             String ss = fileIoEx.toString();