jspdatabasebackup.txt

jsp备份恢复oracle数据库,很简单的几条语句

package org.liuxuan.jsp;

import java.io.*;
import java.text.SimpleDateFormat;
import javax.servlet.*;
import javax.servlet.http.*;


public class Backup extends HttpServlet ...{
    

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException ...{
        SimpleDateFormat dateFm = new SimpleDateFormat("yyyy-MM-dd"); // 格式化当前系统日期
        String dateTime = dateFm.format(new java.util.Date());
        File file = null;
        InputStream is = null;
        String fileName = null;
        int fileSize = 0;
        String mysql = "mysqldump -uroot -p123456 rudisc > c:\" + dateTime+ ".sql";//mysql备份语句
        try ...{
            Process p=java.lang.Runtime.getRuntime().exec("cmd /c " + mysql);
             while(true)...{       
                                                               if(p.waitFor()==0)       break;   //直到进程结束，才退出循环
                                          }           

        } catch (Exception e) ...{
            e.printStackTrace();
        }

        file = new File("c:\"+dateTime+".sql");
        is = new FileInputStream(file);
        fileName = file.getName();
        fileSize = (int) file.length();

        fileName = toUTF8String(fileName);
        // 设置下载文件使用的报头域。
        response.setContentType("application/x-msdownload");
        String str = "attachment; filename=" + fileName;
        response.setHeader("Content-Disposition", str);
        response.setContentLength(fileSize);

        // 得到响应对象的输出流，用于向客户端输出二进制数据。
        ServletOutputStream sos = response.getOutputStream();
        byte[] data = new byte[2048];
        int len = 0;
        while ((len = is.read(data)) > 0) ...{
            sos.write(data, 0, len); // 向浏览器输出文件数据
        }
        is.close(); // 关闭输入流
        sos.close();// 关闭输出流

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException ...{
        doGet(request, response);
    }
                      
    public static String toUTF8String(String str) ...{
        StringBuffer sb = new StringBuffer();
        int len = str.length();

        for (int i = 0; i < len; i++) ...{
            char c = str.charAt(i);
            if (c >= 0 && c <= 255) ...{
                sb.append(c);
            } else ...{
                byte[] b;
                try ...{
                    b = Character.toString(c).getBytes("UTF-8");
                } catch (UnsupportedEncodingException ex) ...{
                    System.err.println(ex);
                    b = null;
                }
                for (int j = 0; j < b.length; j++) ...{
                    int k = b[j];
                    if (k < 0) ...{
                        k &= 255;
                    }
                    sb.append("%" + Integer.toHexString(k).toUpperCase());
                }
            }
        }
        return sb.toString();
    }
}