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();

}

}