java 读写文件

   读写文件是最常用的操作之一，每次将相应的代码片段复制过来不仅麻烦，还会影响整体的美观。为此我单独写了一个文件操作的类，需要时先把这个类的代码粘过去，再调用就方便多了。

import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class FileManager {
    public static String read(String fileName, String encoding) {
        StringBuffer fileContent = new StringBuffer();
        try {
            FileInputStream fis = new FileInputStream(fileName);
            InputStreamReader isr = new InputStreamReader(fis, encoding);
            BufferedReader br = new BufferedReader(isr);
            String line = null;
            while ((line = br.readLine()) != null) {
                fileContent.append(line);
                fileContent.append(System.getProperty("line.separator"));
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
        return fileContent.toString();
    }

    public static void write(String fileContent, String fileName, String encoding) {
        try {
            FileOutputStream fos = new FileOutputStream(fileName);
            OutputStreamWriter osw = new OutputStreamWriter(fos, encoding);
            osw.write(fileContent);
            osw.flush();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

调用示例：
写入 FileManager.write("Hello, World!", "D:\\test.txt", "UTF-8");
读取 System.out.println(FileManager.read("D:\\test.txt", "UTF-8"));