压缩文件

package com.sf.dtx5.cache;

import java.io.ByteArrayOutputStream;
import java.nio.ByteBuffer;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.zip.DeflaterOutputStream;

import com.sf.dtx5.Config;
import com.sf.dtx5.db.ByteLength;
import com.sf.dtx5.db.ConnectionPool;
import com.sf.dtx5.db.DbConnect;
import com.sf.dtx5.domain.Dtx5ForceUpdate;
import com.sf.dtx5.util.ExpOutUtils;
import net.sf.json.JSONObject;
/**
 * dtx5版本号强制升级
 * 
 */
public class Dtx5ForceUpdateTask {
	/**
	 * 新增运单信息查询SQL语句
	 */
	private  String mSearchBillSql = " select t.version_number,t.deadline,sysdate from tm_dtx5_config t where id=(select max(id)from  tm_dtx5_config  where  type='1' and status='0' and deal_flg=0)";

	/**
	 * 从数据库中加载增量数据
	 */
	public byte[] loadIncrementData() {
		Connection con = null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		try {
			con = ConnectionPool.getInstance().getConnection();
			if (con == null) {
				Config.log.writeLog(2, "连接数据库失败");
				return new byte[0];
			}
			pstmt = con.prepareStatement(mSearchBillSql);
			rs = pstmt.executeQuery();
			if (rs.next()) {
/**			String str=rs.getString("version_number");
			StringBuilder version = new StringBuilder();
		    for(int i=0;i<str.indexOf('.');++i){
		    	if (Character.isDigit(str.charAt(i))){
		    		version.append(str.charAt(i));
		    		  }
		    }
		    version.append(".");
		    for(int i=str.indexOf('.')+1;i<str.length();++i){
		    	if (Character.isDigit(str.charAt(i))){
		    		version.append(str.charAt(i));
		    		  }else{
		    			  break;
		    		  }
		    }*/
				            Dtx5ForceUpdate	jsondao = new Dtx5ForceUpdate(rs.getString("version_number"),rs.getString("deadline"),rs.getString("sysdate"));
							JSONObject json = JSONObject.fromObject(jsondao);
							String jsonstr=json.toString();
							byte[]datas=jsonstr.getBytes("UTF-8");
							ByteBuffer buffer = ByteBuffer.allocate(4 + 2 + 12 + 12
									+ ((datas != null) ? datas.length : 0));
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put((byte)0);
							buffer.put(datas);
							ByteArrayOutputStream baos = new ByteArrayOutputStream();
							DeflaterOutputStream dos = new DeflaterOutputStream(baos);
							dos.write(buffer.array());
							dos.finish();
							
							
							
							int len = buffer.array().length;
							ByteBuffer temp = ByteBuffer
									.allocate(4 + baos.toByteArray().length);// 压缩前的数据长度
							temp.putInt(Integer.reverseBytes(len));
							temp.put(baos.toByteArray());
							return temp.array();
			}
		} catch (Exception e) {
			Config.log.writeLog(2, "巴枪版本强制升级>>查询运单失败：%s", ExpOutUtils.getStackTrace(e));
		} finally {
			DbConnect.closeOthers(pstmt, rs);
			ConnectionPool.getInstance().putConnection(con);
		}
		ByteLength bytelength=new ByteLength();
				return bytelength.length();

	}

}