java io study

lsf921016 · lsf921016 · commit cb561b1dca7b · 2017-03-12T23:51:14.000-04:00
diff --git a/.idea/workspace.xml b/.idea/workspace.xml
diff --git a/out/production/javaStudy/DataStructure_Stack/Stack.class b/out/production/javaStudy/DataStructure_Stack/Stack.class
diff --git a/out/production/javaStudy/File/a.txt b/out/production/javaStudy/File/a.txt
@@ -0,0 +1,2 @@
+this is write by nio write
+ append something by nio
diff --git a/out/production/javaStudy/File/b.txt b/out/production/javaStudy/File/b.txt
@@ -0,0 +1,2 @@
+this is write by nio write
+ append something by nio
diff --git a/out/production/javaStudy/File/test.class b/out/production/javaStudy/File/test.class
diff --git a/out/production/javaStudy/javaIO/PrintStream.class b/out/production/javaStudy/javaIO/PrintStream.class
diff --git a/out/production/javaStudy/socket/aCopy.txt b/out/production/javaStudy/socket/aCopy.txt
@@ -0,0 +1 @@
+this is a test
diff --git a/out/production/javaStudy/test.class b/out/production/javaStudy/test.class
diff --git a/src/DataStructure_Stack/Stack.java b/src/DataStructure_Stack/Stack.java
@@ -0,0 +1,38 @@
+package DataStructure_Stack;
+
+import java.util.Arrays;
+
+/**
+ * Created by lenovo on 2017/3/12.
+ */
+public class Stack<T> {
+    private T[] elements;
+    private int len;
+    private int size;
+    Stack(int len){
+        this.len=len;
+
+    }
+
+    public boolean push(T value ){//压栈
+        if(len==elements.length) {
+//            elements = Arrays.copyOf(elements, newElements);
+            elements[len]=value;
+            ++len;
+        }
+        return true;
+    }
+    public T pop(){//弹出
+        --len;
+        return elements[len];
+
+    }
+    public T peek(){//返回栈顶
+        return elements[len];
+
+    }
+    public boolean empty(){//查空
+        return false;
+
+    }
+}
diff --git a/src/File/a.txt b/src/File/a.txt
@@ -1 +1,2 @@
-this is a test
+this is write by nio write
+ append something by nio
diff --git a/src/File/b.txt b/src/File/b.txt
@@ -0,0 +1,2 @@
+this is write by nio write
+ append something by nio
diff --git a/src/File/test.java b/src/File/test.java
@@ -3,18 +3,90 @@
 import java.io.File;
 import java.io.FileWriter;
 import java.io.IOException;
+import java.nio.charset.Charset;
+import java.nio.file.*;
+import java.util.List;
 
 /**
  * Created by lenovo on 2017/3/11.
  */
 public class test {
     public static void main(String[] args) throws IOException {
-        File f=new File("E:\\javaStudy\\src\\File\\a.txt");
-        FileWriter fw=new FileWriter(f);
-        fw.write("this is a test");
-        fw.close();
+        //Path类
+
+        //定义一个Path对象
+        Path path= Paths.get("E:\\javaStudy\\src\\File\\a.txt");
+        System.out.println(path.toString());
+        //获得path的父级路径
+        Path pParent=path.getParent();
+        System.out.println(pParent);
+        //使用path获得一个File对象
+        File f=path.toFile();
+        System.out.println(f.toString());
+
+
+
+
+
+        //使用Files类的静态方法读写：
+
+        //将文件以字符串的形式读出
+        byte[] bytes= Files.readAllBytes(path);
+        String content=new String(bytes);
+        System.out.println(content);
+
+        //将文件当作行序列读入
+        List<String> lines=Files.readAllLines(path);
+        System.out.println(lines);
+
+        //写出一个字符串到文件中
+        Files.write(path,"this is write by nio write".getBytes());
+
+        //向指定文件中追加内容,第三个参数规定了操作是append
+        Files.write(path, "\n append something by nio".getBytes(),StandardOpenOption.APPEND);
+
+        //将一个行的集合写出到文件
+        Path path2=Paths.get("E:\\javaStudy\\src\\File\\b.txt");
+        Files.write(path2,lines);
+
+
+
+
+//        //操作文件：
+//
+//        //移动文件
+//         Files.move(fromPath,toPath);
+//
+//         //复制文件
+//        Files.copy(fromPath,toPath);
+//
+//        //删除文件
+//        Files.delete(path);
+//
+//        //创建文件
+//        Files.createFile(path);
+//
+//        //创建目录
+//        Files.createDirectory(path);
+
+
+
+        //遍历路径下的文件
+        Path dir=Paths.get("E:\\javaStudy\\src\\File");
+        try (DirectoryStream<Path> files=Files.newDirectoryStream(dir)){
+            for (Path file:files){
+                System.out.println(file.getFileName());
+            }
+        }
+
+        //使用正则表达式过滤文件
+        try (DirectoryStream<Path> files=Files.newDirectoryStream(dir,"*.java")){
+            for (Path file:files){
+                System.out.println(file.getFileName());
+            }
+        }
+
 
-        System.out.println(f);
     }
 
 }
diff --git a/src/javaIO/PrintStream.java b/src/javaIO/PrintStream.java
@@ -0,0 +1,10 @@
+package javaIO;
+
+/**
+ * Created by lenovo on 2017/3/12.
+ */
+public class PrintStream {
+    public static void main(String[] args) {
+        PrintStream ps=new PrintStream();
+    }
+}
diff --git a/src/socket/aCopy.txt b/src/socket/aCopy.txt
@@ -0,0 +1 @@
+this is a test
diff --git a/src/test.java b/src/test.java
@@ -1,12 +1,21 @@
+import java.io.*;
 import java.util.Arrays;
 
 /**
  * Created by lenovo on 2017/3/9.
  */
 public class test {
-    public static void main(String[] args) {
-        int[] arr={1,2,3,4,4};
-        String s=Arrays.toString(arr);
-        System.out.println(s);
+    public static void main(String[] args) throws IOException {
+        FileInputStream fis=new FileInputStream("E:\\javaStudy\\src\\File\\a.txt");
+        FileOutputStream fos=new FileOutputStream("E:\\javaStudy\\src\\socket\\aCopy.txt");
+
+        byte[] buf=new byte[1024];
+        int len=0;
+        while ((len=fis.read(buf))!=-1){
+            fos.write(buf,0,len);
+            fos.flush();
+        }
+        fis.close();
+        fos.close();
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	`+this is write by nio write`
	`2`	`+ append something by nio`
Original file line number	Diff line number	Diff line change
`@@ -1 +1,2 @@`
`1`		`-this is a test`
	`1`	`+this is write by nio write`
	`2`	`+ append something by nio`