mysql备份与恢复

我写个了类。里面有个方法叫beifen。内容如下。。
public static void beifen() {

String user = "root"; // 数据库帐号
String password = "root"; // 登陆密码
String database = "studentsmanager"; // 需要备份的数据库名
String filepath = "d:\\databasecopy\\studentsmanager.sql"; // 备份的路径地址

String stmt1 = "mysqldump " + database + " -u " + user + " -p"
+ password + " >dump" + filepath;
try {
Runtime.getRuntime().exec(stmt1);
System.out.println("数据已导出到文件" + filepath + "中");
} catch (Exception e) {
e.printStackTrace();
}
}
然后再jsp中调用它，方法如下：
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";

Database.beifen(); 
%>


但只要运行就出现下面的错误：
java.io.IOException: Cannot run program "mysqldump": CreateProcess error=2, ?????????
at java.lang.ProcessBuilder.start(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at java.lang.Runtime.exec(Unknown Source)
at com.chen.studentManage.util.Database.beifen(Database