关于从数据库中取出来的数据在jsp页面上级联显示出来的问题，和ajax处理乱码

在这里我是用ajax来处理级联的，这里关注的问题是从数据库中取出数据在jsp页面中级联显示，下面是我写的一些代码：

在service中：

    //查找所有违章信息
    public List findAllInfor(){
        return informationDao.findAll();
    }
    
    //得到第一条违章记录
    public InformationTable findOneInfor(){
        List list=findAllInfor();
        return (InformationTable) list.get(0);
    }

在jsp页面中：

<input type="button" value="添加" onclick="abreak()">

                    <select name="acod" id="acod" onchange="aInforChange()">
                        <s:iterator value="#request.information" var="ainfor">
                            <option value="${ainfor.incode }" id="${ainfor.inid }">${ainfor.incode }</option>
                        </s:iterator>
                    </select>

    var acod=document.getElementById("acod");
    var aill=document.getElementById("aill");
    var abas=document.getElementById("abas");
    var arec=document.getElementById("arec");
    var amon=document.getElementById("amon");
    var apun=document.getElementById("apun");

//添加船舶
    function abreak(){
        showBreak.style.display="none";
        updateBreak.style.display="none"
        addBreak.style.display="block";
        //创建核心对象
        var request=null;
        try{
            request=new XMLHttpRequest();
        }catch(e){
            request=new ActiveXObject("microsoft.XMLHttp");
        }
        //打开并发送
        request.open("get","break!firstInfor.do");
        //处理乱码
        request.setRequestHeader("Content-Type","text/html;charset=gb2312");
        request.send(null);
        //接收
        request.onreadystatechange=function(){
            if(request.readyState==4&&request.status==200){
                txt=request.responseText;
                var arr=new Array();
                arr=txt.split("|||");
                aill.value=arr[0];
                abas.value=arr[1];
                arec.value=arr[2];
                amon.value=arr[3];
                apun.value=arr[4];
            }
        }
    }

                  //级联显示违章信息的内容(添加)
    function aInforChange(){
        var inid;
        for(var i=0;i<acod.options.length;i++){
            if(acod.options[i].selected){
                inid=acod.options[i].id;
            }
        }
        //创建核心对象
        var request=null;
        try{
            request=new XMLHttpRequest();
        }catch(e){
            request=new ActiveXObject("microsoft.XMLHttp");
        }
        //打开并发送
        request.open("get","break!jilianInfor.do?inid="+inid);
        //处理乱码
        request.setRequestHeader("Content-Type","text/html;charset=gb2312");
        request.send(null);
        //接收
        request.onreadystatechange=function(){
            if(request.readyState==4&&request.status==200){
                txt=request.responseText;
                arr=new Array;
                arr=txt.split("|||");
                aill.value=arr[0];
                abas.value=arr[1];
                arec.value=arr[2];
                amon.value=arr[3];
                apun.value=arr[4];
            }
        }
    }
    

在Action中：

    //级联显示第一条违章信息
    public void firstInfor(){
        HttpServletRequest request=ServletActionContext.getRequest();
        HttpServletResponse response=ServletActionContext.getResponse();
        
        InformationTable information=breakService.findOneInfor();
        String inill=information.getInillegal();
        String inbas=information.getInbasis();
        String inrec=information.getIngrade().toString();
        String inmon=information.getInmoney().toString();
        String inpun=information.getInpunish();
        StringBuffer sBuffer=new StringBuffer();
        sBuffer.append(inill);
        sBuffer.append("|||");
        sBuffer.append(inbas);
        sBuffer.append("|||");
        sBuffer.append(inrec);
        sBuffer.append("|||");
        sBuffer.append(inmon);
        sBuffer.append("|||");
        sBuffer.append(inpun);
        String string=sBuffer.toString();
        try {
            response.getWriter().print(string);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }
    
    //级联显示违章信息
    public void jilianInfor(){
        HttpServletRequest request=ServletActionContext.getRequest();
        HttpServletResponse response=ServletActionContext.getResponse();
        
        String strinid=request.getParameter("inid");
        if(strinid!=null){
            int inid=Integer.parseInt(strinid);
            InformationTable information=breakService.findInfor(inid);
            String inill=information.getInillegal();
            String inbas=information.getInbasis();
            String inrec=information.getIngrade().toString();
            String inmon=information.getInmoney().toString();
            String inpun=information.getInpunish();
            StringBuffer sBuffer=new StringBuffer();
            sBuffer.append(inill);
            sBuffer.append("|||");
            sBuffer.append(inbas);
            sBuffer.append("|||");
            sBuffer.append(inrec);
            sBuffer.append("|||");
            sBuffer.append(inmon);
            sBuffer.append("|||");
            sBuffer.append(inpun);
            String string=sBuffer.toString();
            try {
                response.getWriter().print(string);
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }else {
            try {
                response.getWriter().print("err");
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }