SSM框架下如何实现数据从后台传输到前台

<fORM action="TestDemo.do" method="post">
<input type="text" name="username" value="${requestScope.textname}">
<input type="submit" value="提交">
</form>

@RequestMapping(value="/TestDemo",method=RequestMethod.POST)
    public String TestDemo(Model model, member mbr,HttpServletRequest request) 
    {
        String text = "";
        request.setAttribute("textname", text); 
        return "";
    }

@RequestMapping(value="/TestDemo")
    public ModelAndView TestDemo() 
    {
        String text = "hello!";
        //ModelAndView中三个参数，跳转页面，接收返回数据的属性，返回的数据
        ModelAndView modelAndView = new ModelAndView("Demo","textname",text); 
        return modelAndView;
    }

@RequestMapping(value="/TestDemo")
    public String TestDemo(Model model) 
    {
        String text = "hello!";
        model.addAttribute("textname", text);
        return "Demo";
    }

<div class="table-box">
			<table>
				<thead>
					<tr>
						<th class="num">序号</th>
						<th class="time">住院号</th>
						<th class="process">姓名</th>
						<th class="num">性别</th>
						<th class="node">科室</th>
						<th class="num">病房</th>
						<th class="num">床位号</th>
						<th class="num">入院情况</th>
						<th class="time">入院时间</th>
					</tr>
				</thead>
				<tbody id="show">
				</tbody>
			</table>
		</div>

var list;
var $tbody = $("#show");
var start = 0;
var end = 15;
function patientQuery() {
	var queryData = $("#patientFindForm").serialize();
	$.ajax({
		url : 'patient/patientQuery.do',
		type : 'post',
		data : queryData,
		dataType : 'JSON',
		success : function(result) {
			if (result.state == 0) {
				var lists = result.data;
				$tbody.empty();
				// 分页
				if (lists.length > 0) {
					$('.pagination').pagination(lists.length, {
						callback : function(page) {
							start = page * this.items_per_page;
							end = (page + 1) * this.items_per_page;
							$tbody.empty();
							showList(lists, start, end);
							return true;
						},
						display_msg : true, // 是否显示记录信息
						setPageNo : true
					// 是否显示跳转第几页
					});
					$("#showbuttom").show();
				} else {
					alert("未找到信息！");
					$("#showbuttom").hide();
					$(".clear").click();
				}
				showList(lists, start, end);
			}
		}
	});
}

	@RequestMapping(value = "/patientQuery.do", produces = "application/json;charset=utf-8")
	@ResponseBody
	public String patientQuery(HttpServletRequest request) throws ParseException {
		PatientCode patientCode = new PatientCode();
		String patientId = BaseUtils.toString(request.getParameter("patientId"));
		String name = BaseUtils.toString(request.getParameter("name"));
		patientCode.setPatientId(patientId);
		patientCode.setDepartmentNo(BaseUtils.toInteger(request.getParameter("departmentNo")));
		// patientCode.setDocid(BaseUtils.toInteger(request.getParameter("Docid")));
		patientCode.setName(name);
		patientCode.setWardNo(BaseUtils.toInteger(request.getParameter("wardNo")));
		patientCode.setBedNo(BaseUtils.toInteger(request.getParameter("bedNo")));
		patientCode.setStart(BaseUtils.toDate(request.getParameter("start")));
		patientCode.setEnd(BaseUtils.toDate(request.getParameter("end")));
		patientCode.setOutStatus(0);// 设置出院状态为未出院
		// System.out.println("当前患者码为:" + patientCode);
		List<Map<String, Object>> list = patientService.patientQuery(patientCode);
		log.info("患者查询");
		for (Map<String, Object> map : list) {// 此处不对从库中取出的时间做toString转化会报java.lang.IllegalArgumentException
			String admissionTime = map.get("admissionTime").toString();
			map.put("admissionTime", admissionTime);
			String birth = map.get("birth").toString();
			map.put("birth", birth);
		}
		JSON json = JSONSerializer.toJSON(new JsonResult<List<Map<String, Object>>>(list));
		return json.toString();
	}

@Repository("patientMapper")
public interface PatientMapper {
	
	void patientAdd(Patient patient);
	
	List<Map<String, Object>> patientQuery(PatientCode patientCode);
	

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.qut.mapper.PatientMapper">
	<insert id="patientAdd" parameterType="com.qut.pojo.Patient">
		insert into
		patient
		(patientId,patientName,gender,nation,birth,department,certificateNo,workUnit,maritalStatus,doctorId,admissionTime,homeAddress,homePhone,contacts,contactsPhone,admissionStatus,roomType,roomNo,bedNo,state)
		values
		(#{patientId},#{name},#{gender},#{nation},#{birth},#{department},#{cerificateNo},#{workUnit},#{maritalStatus},#{doctorId},NOW(),#{homeAddress},#{homePhone},#{contacts},#{contactsPhone},#{admissionStatus},#{roomType},#{roomNo},#{bedNo},#{state})
	</insert>
	<select id="patientQuery"
		parameterType="com.qut.pojo.PatientCode" resultType="map">
		select
		a.id as
		"id",
		a.patientId as "patientId",
		a.patientName as "name",
		a.gender as
		"gender",
		a.nation as "nation",
		a.birth as "birth",
		a.department as
		"department",
		g.`name` as "departmentName",
		a.certificateNo as
		"cerificateNo",
		a.workUnit as "workUnit",
		a.doctorId as "doctorId",
		b.`name` as "doctorName",
		a.admissionTime as "admissionTime",
		a.homeAddress as "homeAddress",
		a.homePhone as "homePhone",
		a.contacts
		as "contacts",
		a.contactsPhone as "contactsPhone",
		a.admissionStatus as
		"admissionStatus",
		a.roomType as "roomType",
		c.`name` as "roomTypeName",
		a.roomNo as "roomNo",
		a.bedNo as "bedNo",
		a.state as "state",
		a.settlementState as "settlementState",
		a.leaveTime as "leaveTime"
		from
		patient a LEFT JOIN doctor b ON
		a.doctorId = b.doctorId
		LEFT JOIN
		cateGory c ON a.roomType = c.type
		LEFT JOIN (
		SELECT e.parameter_values
		"value",e.parameter_name "name"
		from
		parameter d LEFT JOIN paracode e ON
		d.`code` = e.`code`
		where
		d.name="科室"
		) g ON a.department = g.`value`
		where
		1=1
		and
		if(#{patientId}
		is null,0=0,patientId=#{patientId})
		and
		if(#{name} is null,0=0,
		patientName like CONCAT('%',#{name},'%'))
		and
		if(#{departmentNo} is
		null,0=0,department=#{departmentNo})
		and
		if(#{Docid} is
		null,0=0,a.doctorId=#{Docid})
		and
		if(#{start} is
		null,0=0,admissionTime &gt;= #{start})
		and
		if(#{end} is
		null,0=0,admissionTime &lt;= #{end})
		and
		if(#{wardNo} is
		null,0=0,roomNo=#{wardNo})
		and
		if(#{bedNo} is null,0=0,bedNo=#{bedNo})
		and
		if(#{outStart} is null,0=0,leaveTime &gt;= #{outStart})
		and
		if(#{outEnd} is null,0=0, leaveTime &lt;= #{outEnd})
		and
		if(#{outStatus} is null,0=0,leaveState = #{outStatus})
		and
		if(#{cerificateNo} is null,0=0,certificateNo = #{cerificateNo})
		order
		by
		id,admissionTime
	</select>