tomcat启动方式不同导致代码无法运行？解决办法

try {            System.out.println("runtime");            String cmd = "cmd.exe /c start " + "D:\\SLDDataCenter\\Postgresql\\backup.bat" ;                    Process p = Runtime.getRuntime().exec(cmd);            BufferedReader br = new BufferedReader( new InputStreamReader(p.getInputStream()));            System.out.println("waiting for password...");            while((br.readLine())!=null){                System.out.println("br: "+br.readLine());            }            while (true){                if(p.waitFor() == 0)break;             }            p.destroy();        } catch (Exception e1) {            // TODO Auto-generated catch block            e1.printStackTrace();        }

       //==========================数据库备份代码 开始===========================//        BufferedWriter mBufWriter = null;                //建立一个BackupDb.bat文件        FileWriter fileWriter = new FileWriter("BackupDb.bat");        mBufWriter = new BufferedWriter(fileWriter);        //转到PostgreSQL安装的根目录        String batLine1=getText("database.postgresPath1");                //转到PostgreSQL下pg_dump.exe文件的路径        String batLine2="cd " + getText("database.postgresPath2");        String batLine4="CLS";                //设置数据库密码，为了跳过后面输入密码的过程        String batLine3="set PGPASSWORD=" + getText("database.postgresdbPwd");                /* *********************************************************         * pg_dump：命令执行备份         * -c：输出在创建数据库创建命令之前先清理（删除）该数据库对象的命令。         * -d：将数据输出为的INSERT命令（而不是 COPY）。（PostgreSQL8.4上无效，暂时不添加）         * -h：主机名         * **********************************************************/        String batLine501="pg_dump -c -h " + getText("database.postgresdbHost");                //-U 数据库用户名        String batLine502=" -U " + getText("database.postgresusername");                //-p数据库端口        String batLine503=" -p " + getText("database.postgresdbPort");                 //-E导出文件字符编码        String batLine504=" -E " + getText("database.bakupcode");         //要备份的数据库名称        String batLine505=" -D " + getText("database.postgresdbName") +" > ";        batLine505=" " + getText("database.postgresdbName") +" > ";        //取系统时间        Date NowTimes = new Date();        //将时间格式化成yyMMddhhmmss(年月日时分秒)        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMddhhmmssms");        String BackupDbName = StringUtils.getPath(getText("database.bakupPath"))+ sdf.format(NowTimes) + ".backup";        BackupDbName = getText("database.bakupPath")+ sdf.format(NowTimes) + ".backup";        mBufWriter.write(batLine1);        mBufWriter.newLine();        mBufWriter.write(batLine2);        mBufWriter.newLine();        mBufWriter.write(batLine3);        mBufWriter.newLine();        mBufWriter.write(batLine4);        mBufWriter.newLine();        mBufWriter.write(batLine501);        mBufWriter.write(batLine502);        mBufWriter.write(batLine503);        mBufWriter.write(batLine504);        mBufWriter.write(batLine505);        mBufWriter.write(BackupDbName);        mBufWriter.newLine();        mBufWriter.flush();        mBufWriter.close();        try {                        // 执行BackupDb.bat文件进行备份数据库            Runtime.getRuntime().exec("BackupDb.bat");                     } catch (Exception e) {            e.printStackTrace();                           setErrMes("文件备份失败！");              // 画面刷新处理                return init();        }        // ==========================数据库备份代码 结束===========================//