判断答题正确与错误（第八天）

第八天;
答题嘛，最重要的就是答案的正确与否了

思路：
1.把题号和答案通过ajax传到后台
2.拿到题号后去数据库查询答案，进行对比，进行错误次数记录；然后把数据传达前台

onepage.jsp

这个页面里面要添加一段ajax

    //检验答案
    function checkResult(sid){
        var choiceval = "";
        $("input[name='"+sid+"']").each(function() { 
            if($(this).attr("checked"))
            {
                choiceval=choiceval+$(this).val();
            }
        });
        $.ajax({
            type:"post",//请求方式
            url:"answer/check.action",//请求路径
            data:{//传参
                subjectid:sid,
                choice:choiceval
            },
            success:function(data){
                $("#"+sid).html(data);
            }
            
        });     
    };

struts.xml

对应的配置文件也发生了变化,要添加一段action

<action name="check" class="subjectAction" method="check"/>

SubjectAction.java

一个个来

    /**
     * 答案检测
     * 
     * @throws IOException
     */
    @Autowired
    ErrorsubjectService errorsubjectService;
    String choice;

    Long subjectid;
    public String getChoice() {
        return choice;
    }

    public void setChoice(String choice) {
        this.choice = choice;
    }

    public Long getSubjectid() {
        return subjectid;
    }

    public void setSubjectid(Long subjectid) {
        this.subjectid = subjectid;
    }

    public void check() throws IOException {

        PrintWriter out = ServletActionContext.getResponse().getWriter();
        String outputstr = "";
        boolean result = subjectService.check(subjectid, choice);
        if (result) {
            outputstr = "success";

        } else {
            errorsubjectService.errorsubjectSaveOrUpdate(subjectid);
            outputstr = "error>>正确答案是："
                    + subjectService.findById(subjectid).getResulter();
        }
        // 强制刷新
        out.write(outputstr);
        out.flush();
        out.close();
    }

SubjectService.java

添加判断答案的代码
    public Subject findById(Long subjectid){
        return subjectDAO.findById(subjectid);
    }
    /**
     * 答案校准
     * 
     * @param subjectid
     * @param choice
     * @return
     */
    public boolean check(Long subjectid, String choice) {
        Subject sub = findById(subjectid);
        if (sub.getResulter().equals(choice)) {
            return true;
        } else {
            return false;
        }
    }

ErrorsubjectService.java

添加如下代码

    Userinfo userinfo = (Userinfo) ServletActionContext.getRequest()
            .getSession().getAttribute("userinfo");
    public void errorsubjectSaveOrUpdate(Long subjectid) {
        Errorsubject errorsubject = new Errorsubject();

        errorsubject.setUserinfo(userinfo);
        
        Subject sb = new Subject();
        sb.setSubjectid(subjectid);
        errorsubject.setSubject(sb);
        long userid = userinfo.getUserid();
        List<Errorsubject> list =  errorsubjectDAO.findByUidSid(userid,subjectid);
        errorsubject.setErrordate(new Date());
        long degree = 1;
        if(list.size() > 0){
            Errorsubject es = (Errorsubject) list.get(0);
            degree = es.getErrordegree();
            degree = degree+1;
            errorsubject.setErrordegree(degree++);
            errorsubject.setErrorid(es.getErrorid());//区分更新与保存的重要信息
            errorsubjectDAO.merge(errorsubject);//更新错误信息
        }else{
            errorsubject.setErrordegree(degree);
            errorsubjectDAO.save(errorsubject);//保存错误信息
        }
    }

ErrorsubjectDAO.java

添加如下代码

    public List<Errorsubject> findByUidSid(Long userid, Long subjectid) {
        String queryString = "from Errorsubject as e where e.userinfo.userid='"+userid+"' and e.subject.subjectid = '"+subjectid+"'";
        return getHibernateTemplate().find(queryString);
    }