新增：文本文件的操作案例

Signed-off-by: BYSocket <qiangqiangli1993@gmail.com>

Author: JeffLi1993

src/org/javacore/io/TextFile.java

@@ -0,0 +1,120 @@
+package org.javacore.io;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.TreeSet;
+
+/*
+ * Copyright [2015] [Jeff Lee]
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @author Jeff Lee
+ * @since 2015-9-30 16:10:18
+ * 文本文件的操作案例
+ */
+public class TextFile extends ArrayList<String> {
+
+	private static final long serialVersionUID = -6710557138987846943L;
+
+	// 读取文件内容，返回内容字符串
+	public static String read(String fileName) {
+		StringBuilder sb = new StringBuilder();
+		try {
+			// 创建缓存字符输入流
+			BufferedReader in = new BufferedReader(new FileReader(// 创建读取字符文件类
+					new File(fileName).getAbsolutePath()));// 文件绝对路径地址
+			try {
+				String s;
+				// 读取一个文本行
+				while ((s = in.readLine()) != null) {
+					sb.append(s);
+					sb.append("\n");
+				}
+			} finally {
+				in.close();
+			}
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+		return sb.toString();
+	}
+	
+	// 将字符串写入一个文本文件
+	public static void write(String fileName,String text) {
+		try {
+			// 创建打印输出流
+			PrintWriter out = new PrintWriter(
+					new File(fileName).getAbsolutePath());
+			try {
+				// 写入字符流
+				out.write(text);
+			} finally {
+				out.close();
+			}
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+	}
+	
+	// 通过正则匹配，读取文件
+	public TextFile(String fileName,String splitter) {
+		super(Arrays.asList(read(fileName).split(splitter)));
+		// 移除一个空格位置
+		if (get(0).equals("")) remove(0);
+	}
+	
+	public TextFile(String fileName) {
+		this(fileName, "\n");
+	}
+	
+	// 写入一个文本文件
+	public void write(String fileName) {
+		try {
+			// 创建打印输出流
+			PrintWriter out = new PrintWriter(
+					new File(fileName).getAbsolutePath());
+			try {
+				for (String  item : this)
+					out.write(item);
+			} finally {
+				out.close();
+			}
+		} catch (IOException e) {
+			throw new RuntimeException(e);
+		}
+		
+	}
+	
+	public static void main(String[] args) {
+		// 读取文件
+		String file = read("src/org/javacore/io/TextFile.java");
+		// 写入到test.txt
+		write("test.txt", file);
+		
+		TextFile text = new TextFile("test.txt");
+		text.write("test2.txt");
+		
+		TreeSet<String> words = new TreeSet<>(
+				new TextFile("src/org/javacore/io/TextFile.java","\\W+"));
+		System.out.println(words.headSet("a"));
+		
+	}
+}