import java.io.BufferedReader;  import java.io.File;  import java.io.FileInputStream;  import java.io.FileOutputStream;  import java.io.IOException;  import java.io.InputStream;  import java.io.InputStreamReader;  import java.io.OutputStream;  import java.io.OutputStreamWriter;        public class Test {   public static void main(String[] args) throws IOException{    backup("d:\\d.sql");    recover("d:\\d.sql");   }   public static void backup(String path) throws IOException{    Runtime runtime = Runtime.getRuntime();    //-u后面是用户名，-p是密码-p后面最好不要有空格，-family是数据库的名字    Process process = runtime.exec("mysqldump -u root -p123456 family");    InputStream inputStream = process.getInputStream();//得到输入流，写成.sql文件    InputStreamReader reader = new InputStreamReader(inputStream);    BufferedReader br = new BufferedReader(reader);    String s = null;    StringBuffer sb = new StringBuffer();    while((s = br.readLine()) != null){     sb.append(s+"\r\n");    }    s = sb.toString();    System.out.println(s);    File file = new File(path);    file.getParentFile().mkdirs();    FileOutputStream fileOutputStream = new FileOutputStream(file);    fileOutputStream.write(s.getBytes());    fileOutputStream.close();    br.close();    reader.close();    inputStream.close();   }   public static void recover(String path) throws IOException{    Runtime runtime = Runtime.getRuntime();    //-u后面是用户名，-p是密码-p后面最好不要有空格，-family是数据库的名字，--default-character-set=utf8，这句话一定的加    //我就是因为这句话没加导致程序运行成功，但是数据库里面的内容还是以前的内容，最好写上完成的sql放到cmd中一运行才知道报错了    //错误信息：    //mysql: Character set 'utf-8' is not a compiled character set and is not specified in the '    //C:\Program Files\MySQL\MySQL Server 5.5\share\charsets\Index.xml' file ERROR 2019 (HY000): Can't    // initialize character set utf-8 (path: C:\Program Files\MySQL\MySQL Server 5.5\share\charsets\)，    //又是讨人厌的编码问题，在恢复的时候设置一下默认的编码就可以了。    Process process = runtime.exec("mysql -u root -p123456 --default-character-set=utf8 family");    OutputStream outputStream = process.getOutputStream();    BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(path)));    String str = null;    StringBuffer sb = new StringBuffer();    while((str = br.readLine()) != null){     sb.append(str+"\r\n");    }    str = sb.toString();    System.out.println(str);    OutputStreamWriter writer = new OutputStreamWriter(outputStream,"utf-8");    writer.write(str);    writer.flush();    outputStream.close();    br.close();    writer.close();   }  }