下载文件的servlet为什么会执行两遍？

[xiaomineer]

代码如下：
package office.servlet;


import javax.servlet.http.*;
import javax.servlet.*;

import java.sql.*;
import java.io.*;
import office.notify.*;

public class showNotify extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response){
service(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response){
service(request,response);
}

public void service(HttpServletRequest request, HttpServletResponse response){

try{


NotifyExec NotifyExec = new NotifyExec();
String notifyid="";
String strExt="";
String sql = "";
notifyid=request.getParameter("notifyid");
strExt=NotifyExec.getOneNotifyExt(notifyid);
System.out.println(strExt);
sql = "select affix from of_notify where notifyid="+ notifyid ;
System.out.println(sql);
cscec.database.sysdbcon DB = new cscec.database.sysdbcon();
ResultSet rs = DB.executeQuery(sql);
while(rs.next())
{
response.reset();
if(strExt.equalsIgnoreCase("doc"))
{
response.setContentType("application/msword");
}
else if(strExt.equalsIgnoreCase("xls"))
{
response.setContentType("application/vnd.ms-excel");
}
else if(strExt.equalsIgnoreCase("jpg"))
{
response.setContentType("image/jpeg");
}
else if(strExt.equalsIgnoreCase("txt")) {
response.setContentType("text/plain");
}
else if(strExt.equalsIgnoreCase("jpeg"))
{
response.setContentType("image/jpeg");
}
else if(strExt.equalsIgnoreCase("gif"))
{
response.setContentType("image/gif");
}
else if(strExt.equalsIgnoreCase("bmp"))
{
response.setContentType("image/bmp");
}
else
{
response.setContentType("application/octet-stream");
String fileName = "";
fileName = rs.getString("affix");
response.setHeader("Content-Disposition", "filename=" + new String(fileName.getBytes(),"ISO-8859-1"));
}

OutputStream sos = response.getOutputStream();
InputStream in = null;
in = rs.getBinaryStream("affix");

int len = 0;
byte[] b = new byte[1024];
while((len = in.read(b)) > 0)
{
sos.write(b,0,len);
}
b=null;
in.close();
sos.close();
}
rs.close();
DB.close();

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

}

[xiaomineer]

修改后代码如下：
package office.servlet;


import javax.servlet.http.*;
import javax.servlet.*;

import java.sql.*;
import java.io.*;
import office.notify.*;

public class showNotify extends HttpServlet{

public void doGet(HttpServletRequest request, HttpServletResponse response){
dosometing(request,response);
}

public void doPost(HttpServletRequest request, HttpServletResponse response){
dosometing(request,response);
}


public void dosometing(HttpServletRequest request, HttpServletResponse response){
try{


NotifyExec NotifyExec = new NotifyExec();
String notifyid="";
String strExt="";
String sql = "";
notifyid=request.getParameter("notifyid");
strExt=NotifyExec.getOneNotifyExt(notifyid);
System.out.println(strExt);
sql = "select affix from of_notify where notifyid="+ notifyid ;
System.out.println(sql);
cscec.database.sysdbcon DB = new cscec.database.sysdbcon();
ResultSet rs = DB.executeQuery(sql);
while(rs.next())
{
response.reset();

if(strExt.equalsIgnoreCase("doc"))
{
response.setContentType("application/msword");
}
else if(strExt.equalsIgnoreCase("xls"))
{
response.setContentType("application/vnd.ms-excel");
}
else if(strExt.equalsIgnoreCase("jpg"))
{
response.setContentType("image/jpeg");
}
else if(strExt.equalsIgnoreCase("txt")) {
response.setContentType("text/plain");
}
else if(strExt.equalsIgnoreCase("jpeg"))
{
response.setContentType("image/jpeg");
}
else if(strExt.equalsIgnoreCase("gif"))
{
response.setContentType("image/gif");
}
else if(strExt.equalsIgnoreCase("bmp"))
{
response.setContentType("image/bmp");
}
else
{
response.setContentType("application/octet-stream");
String fileName = "";
fileName = rs.getString("affix");
response.setHeader("Content-Disposition", "filename=" + new String(fileName.getBytes(),"ISO-8859-1"));
}

OutputStream sos = response.getOutputStream();
InputStream in = null;
in = rs.getBinaryStream("affix");

int len = 0;
byte[] b = new byte[1024];
while((len = in.read(b)) > 0)
{
sos.write(b,0,len);
}
b=null;
in.close();
//sos.flush();//
sos.close();
}
rs.close();
DB.close();
}catch(Exception ee){
ee.printStackTrace();
}
}

}

[cyicecream]

嘿嘿，解决了，就给分哈

[xiaomineer]

servlet的执行顺序是，执行完了service方法后执行doget或dopost，
因此直接把要执行的代码写到service方法里，然后再由doget或dopost调用，这样就执行了两遍service方法里面的代码。
多谢 cyicecream(为了升仙（星）到处UP) 指点！在下感激不尽！