Java代码实现MySQL数据库的备份与导入

Java代码实现MySQL数据库的备份与导入

首先，设置mysql的环境变量（在path中添加%MYSQL_HOME%\bin），重启电脑。
完整代码：
  
    public static void main(String[] args) {
      
        backup();
        load();
    }

  
    public static void backup() {
        try {
            Runtime rt = Runtime.getRuntime();

            // 调用 mysql 的 cmd:
            Process child = rt
                    .exec("mysqldump -u root --set-charset=utf8 bjse act_obj");// 设置导出编码为utf8。这里必须是utf8
          
            // 把进程执行中的控制台输出信息写入.sql文件，即生成了备份文件。注：如果不对控制台信息进行读出，则会导致进程堵塞无法运行
            InputStream in = child.getInputStream();// 控制台的输出信息作为输入流
                      
            InputStreamReader xx = new InputStreamReader(in, "utf8");// 设置输出流编码为utf8。这里必须是utf8，否则从流中读入的是乱码
          
            String inStr;
            StringBuffer sb = new StringBuffer("");
            String outStr;
            // 组合控制台输出信息字符串
            BufferedReader br = new BufferedReader(xx);
            while ((inStr = br.readLine()) != null) {
                sb.append(inStr + "\r\n");
            }
            outStr = sb.toString();
          
            // 要用来做导入用的sql目标文件：
            FileOutputStream fout = new FileOutputStream(
                    "e:/mysql-5.0.27-win32/bin/bjse22.sql");
            OutputStreamWriter writer = new OutputStreamWriter(fout, "utf8");
            writer.write(outStr);
            // 注：这里如果用缓冲方式写入文件的话，会导致中文乱码，用flush()方法则可以避免
            writer.flush();

            // 别忘记关闭输入输出流
            in.close();
            xx.close();
            br.close();
            writer.close();
            fout.close();

            System.out.println("");

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

    }

  
    public static void load() {
        try {
            String fPath = "e:/mysql-5.0.27-win32/bin/bjse22.sql";
            Runtime rt = Runtime.getRuntime();

            // 调用 mysql 的 cmd:
            Process child = rt.exec("mysql -u root bjse ");
            OutputStream out = child.getOutputStream();//控制台的输入信息作为输出流
            String inStr;
            StringBuffer sb = new StringBuffer("");
            String outStr;
            BufferedReader br = new BufferedReader(new InputStreamReader(
                    new FileInputStream(fPath), "utf8"));
            while ((inStr = br.readLine()) != null) {
                sb.append(inStr + "\r\n");
            }
            outStr = sb.toString();

            OutputStreamWriter writer = new OutputStreamWriter(out, "utf8");
            writer.write(outStr);
            // 注：这里如果用缓冲方式写入文件的话，会导致中文乱码，用flush()方法则可以避免
            writer.flush();
            // 别忘记关闭输入输出流
            out.close();
            br.close();
            writer.close();

            System.out.println("");

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

    }