java类编译为class文件

Question

我的java类由myeclipse自动编译为class文件，然后我用反编译工具打开class文件，为什么java类和反编译的class文件有区别 

Answer 1

这个是java类里面的方法：
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest req, HttpServletResponse res) {
        Locale localeStruts = null;
        localeStruts = (Locale) req.getSession().getAttribute(Globals.LOCALE_KEY);
        String locale = "en";
        if (localeStruts != null && Locale.CHINA.equals(localeStruts)) {
            locale = "zh";
        }
        String email = req.getParameter("email");
        String userNme = req.getParameter("names");
        System.out.println("UserName = " + userNme); 
        String cmpyNme = req.getParameter("company_name");
        Context initial = null;
        try {
            initial = new InitialContext();
            GuestSubscripeHome home = null;
            home = (GuestSubscripeHome) initial.lookup("java:comp/env/ejb/GuestSubscripeBean");
            System.out.println("home");
            GuestSubscripe sl = home.create();
            System.out.println("create    "+sl.toString()+"end");
            GssUserVO gssUserVO = sl.isEmailExist(email.trim());
            System.out.println("gssUserVO"+gssUserVO);
            if (gssUserVO != null) {
/*                  if("U".equalsIgnoreCase( gssUserVO.getUserStatus())){
                        req.setAttribute("unsub","Y");
                        gssUserVO.setUserStatus("C");
                        sl.sendConfirmEmail(gssUserVO);
                        return mapping.findForward("emailexist");
                  }
                  gssUserVO.setUserStatus("U");
                  sl.sendConfirmEmail(gssUserVO);
                  return mapping.findForward("emailexist");*/
                req.setAttribute("trueUser", "Y");
                req.setAttribute("laststatus", gssUserVO.getUserStatus());
                req.setAttribute("action", "subscribe");
                String status = gssUserVO.getUserStatus();
                if ("C".equalsIgnoreCase(status))
                    gssUserVO.setUserStatus("U");
                else
                    gssUserVO.setUserStatus("C");
                sl.sendConfirmEmail(gssUserVO, locale);
                return mapping.findForward("emailexist");
            }
            System.out.println("===========");
            List serviceTypeID = sl.getAllServiceTypeID();
            System.out.println(serviceTypeID.size()+"size");
            List templateUuids = new ArrayList();
            System.out.println("hservices:"+req.getParameter("hservices"));
            String hservices = req.getParameter("hservices");
            if (serviceTypeID != null) {
//                String s = null;
//                String[] ss = null;
                String service[] = new String[]{hservices};
                for (int i = 0; i < serviceTypeID.size(); i++) {
                 if(service!=null&&!"".equals(service)){
                 for (int j = 0; j < service.length; j++) {
                 System.out.println("service[j]===="+service[j]);
//                 String templateUuid = sl.findTemplateUuidByLoopAbbrv(service[j]);
// templateUuids.add(templateUuid);
                 templateUuids.add(service[j]);
}
                 }
//                    s = "h_" + ((String) serviceTypeID.get(i)).trim();
//                    ss = req.getParameterValues(s);
//                    if (ss != null) {
//                        for (int j = 0; j < ss.length; j++) {
//                            templateUuids.add(ss[j]);
//                            System.out.println("GssTempldateUuid:"+ss[j]);//getGssTempldateUuid()
//                        }
//                    }
                }               
            }
            gssUserVO = new GssUserVO();
            gssUserVO.setUserStatus("C");
            gssUserVO.setUserEmail(email);
            gssUserVO.setUserNme(userNme);
            gssUserVO.setCmpyNme(cmpyNme);
            String userUuid = sl.createGuestSubScripe(email, userNme, cmpyNme, "N", templateUuids);
            gssUserVO.setGssUserUuid(userUuid);
            sl.sendConfirmEmail(gssUserVO, locale);
        } catch (NamingException e) {
            req.setAttribute("exception",e);
            logger.error(e.toString());
            return mapping.findForward("error");
        } catch (RemoteException e) {
            req.setAttribute("exception",e);
            logger.error(e.toString());
            return mapping.findForward("error");
        } catch (CreateException e) {
            req.setAttribute("exception",e);
            logger.error(e.toString());
            return mapping.findForward("error");
        }
        return mapping.findForward("result");
    }

Answer 2

这不是标准唯一的互相转化，就像给你一句中文A，你翻译成英文B，再拿去给你女朋友翻译成中文，结果她没有翻译成A。你不能打她一顿吧？

Answer 3

这个是class反编译出来的：
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest req, HttpServletResponse res)
    {
        String locale;
        String email;
        String userNme;
        String cmpyNme;
        Locale localeStruts = null;
        localeStruts = (Locale)req.getSession().getAttribute("org.apache.struts.action.LOCALE");
        locale = "en";
        if(localeStruts != null && Locale.CHINA.equals(localeStruts))
            locale = "zh";
        email = req.getParameter("email");
        userNme = req.getParameter("names");
        System.out.println("UserName = " + userNme);
        cmpyNme = req.getParameter("company_name");
        Context initial = null;
        GuestSubscripe sl;
        Context initial = new InitialContext();
        GuestSubscripeHome home = null;
        home = (GuestSubscripeHome)initial.lookup("java:comp/env/ejb/GuestSubscripeBean");
        System.out.println("home");
        sl = home.create();
        System.out.println("create    " + sl.toString() + "end");
        GssUserVO gssUserVO = sl.isEmailExist(email.trim());
        System.out.println("gssUserVO" + gssUserVO);
        if(gssUserVO == null)
            break MISSING_BLOCK_LABEL_302;
        req.setAttribute("trueUser", "Y");
        req.setAttribute("laststatus", gssUserVO.getUserStatus());
        req.setAttribute("action", "subscribe");
        String status = gssUserVO.getUserStatus();
        if("C".equalsIgnoreCase(status))
            gssUserVO.setUserStatus("U");
        else
            gssUserVO.setUserStatus("C");
        sl.sendConfirmEmail(gssUserVO, locale);
        return mapping.findForward("emailexist");
        try
        {
            System.out.println("===========");
            List serviceTypeID = sl.getAllServiceTypeID();
            System.out.println(serviceTypeID.size() + "size");
            List templateUuids = new ArrayList();
            System.out.println("hservices:" + req.getParameter("hservices"));
            String hservices = req.getParameter("hservices");
            if(serviceTypeID != null)
            {
                String service[] = {
                    hservices
                };
                for(int i = 0; i < serviceTypeID.size(); i++)
                    if(service != null && !"".equals(service))
                    {
                        for(int j = 0; j < service.length; j++)
                        {
                            System.out.println("service[j]====" + service[j]);
                            templateUuids.add(service[j]);
                        }                    }            }
            GssUserVO gssUserVO = new GssUserVO();
            gssUserVO.setUserStatus("C");
            gssUserVO.setUserEmail(email);
            gssUserVO.setUserNme(userNme);
            gssUserVO.setCmpyNme(cmpyNme);
            String userUuid = sl.createGuestSubScripe(email, userNme, cmpyNme, "N", templateUuids);
            gssUserVO.setGssUserUuid(userUuid);
            sl.sendConfirmEmail(gssUserVO, locale);
        }
        catch(NamingException e)
        {
            req.setAttribute("exception", e);
            logger.error(e.toString());
            return mapping.findForward("error");
        }
        catch(RemoteException e)
        {
            req.setAttribute("exception", e);
            logger.error(e.toString());
            return mapping.findForward("error");
        }
        catch(CreateException e)
        {
            req.setAttribute("exception", e);
            logger.error(e.toString());
            return mapping.findForward("error");
        }
        return mapping.findForward("result");
    }

Answer 4

看这行代码、
return mapping.findForward("emailexist");
class文件里面的直接在中间执行，那不是后面的代码都没得执行机会了