下边列举出了三种向文件中写入数据的方式，当然还有其他方式，帮助自己理解文件写入类的继承关系。类的关系：

file->fileoutputstream->outputstreamWriter(FileWriter继承outputstreamWriter对象)

测试代码：

import java.io.File;import java.io.FileOutputStream;import java.io.FileWriter;import java.io.IOException;import java.io.OutputStreamWriter;/** * 测试向文件中写文件 *  * @author lenovo *  */public class TestWirteFile {    /**     * @param args     * @throws IOException     */    public static void main(String[] args) throws IOException {        String sContent = "2015年的双十一真的是非常火爆!";        String sDestFile = "F:/myWrite.txt";        File destFile = new File(sDestFile);        if (!destFile.exists()) {            destFile.createNewFile();        }        // 1.向文件写入内容        // writeByFileWrite(sDestFile, sContent);        // 2.FileOutputStream向文件写入内容        // writeByFileWrite(sDestFile, sContent);        // 2.OutputStreamWriter向文件写入内容        writeByOutputStreamWrite(sDestFile, sContent);    }    /**     * 用FileWrite向文件写入内容     *      * @param _destFile     * @throws IOException     */    public static void writeByFileWrite(String _sDestFile, String _sContent)            throws IOException {        FileWriter fw = null;        try {            fw = new FileWriter(_sDestFile);            fw.write(_sContent);        } catch (Exception ex) {            ex.printStackTrace();        } finally {            if (fw != null) {                fw.close();                fw = null;            }        }    }    /**     * 用FileOutputStream向文件写入内容     *      * @param _destFile     * @throws IOException     */    public static void writeByFileOutputStream(String _sDestFile,            String _sContent) throws IOException {        FileOutputStream fos = null;        try {            fos = new FileOutputStream(_sDestFile);            fos.write(_sContent.getBytes());        } catch (Exception ex) {            ex.printStackTrace();        } finally {            if (fos != null) {                fos.close();                fos = null;            }        }    }    /**     * 用OutputStreamWrite向文件写入内容     *      * @param _destFile     * @throws IOException     */    public static void writeByOutputStreamWrite(String _sDestFile,            String _sContent) throws IOException {        OutputStreamWriter os = null;        FileOutputStream fos = null;        try {            fos = new FileOutputStream(_sDestFile);            os = new OutputStreamWriter(fos, "UTF-8");            os.write(_sContent);        } catch (Exception ex) {            ex.printStackTrace();        } finally {            if (os != null) {                os.close();                os = null;            }            if (fos != null) {                fos.close();                fos = null;            }        }    }}