前后台数据交换，printwriter、jsonobject、jsonarray、ajax请求，数据交换

　　后台代码：

public void findByIDEquipment() {
        getResponse().setCharacterEncoding("UTF-8");
        getResponse().setContentType("text/html;charset=UTF-8");
        PrintWriter out;
        JSONObject obj = new JSONObject();
        JSONArray jarr = new JSONArray();
        ArrayList<Equipment> eq_array_list = new ArrayList<Equipment>();
        SimpleDateFormat sdf = new SimpleDateFormat();
        try {
            out = getResponse().getWriter();

            System.out.println(eq_id);

            long id = Long.valueOf(getRequest().getParameter("eq_id"));
            System.out.println("id is" + id);
            Equipment eq = eq_service.findEquipmentById(id);
            Equipment eq1 = eq;
            eq_array_list.add(eq);
            if (eq != null) {
                /*
                 * getSession().setAttribute("eq_name", eq.getName());
                 * getSession().setAttribute("eq_comment", eq.getComment());
                 * getSession().setAttribute("eq_pn", eq.getPn());
                 * getSession().setAttribute("eq_sn", eq.getSn());
                 * getSession().setAttribute("eq_inDate", eq.getInDate());
                 * getSession().setAttribute("eq_alarmDay",
                 * eq.getAlarmTimeDay());
                 * getSession().setAttribute("eq_overTime", eq.getOverTime());
                 * getSession().setAttribute("eq_username",
                 * eq.getEq_user().getUsername());
                 */
                obj.put("eq1", eq1);
                obj.put("indate", sdf.format(eq1.getInDate()));
                obj.put("overdate", sdf.format(eq1.getOverTime()));
                jarr.add(obj);

                out.print(jarr);
                out.flush();

            } else {
                out.println(false);
            }

        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }

前台代码：

/* 详情动作 */
	$('.action_div')
			.click(
					function() {
						var click_num = $('.action_div').index(this)
						console.log(click_num)
						var eq_id = $('.action_div').eq(click_num).attr('org')
						console.log("select item id is" + eq_id)

						$.ajax({
							type : "POST",
							url : "findByIDEquipmentAction?fresh="
									+ Math.random(),
							data : {
								"eq_id" : eq_id
							},
							cache : false,
							async : true,
							dataType : "json",
							success : function(res) {
								console.log(res)
								console.log(res[0].eq1.name)

								if (res) {

									$('.getname').text(res[0].eq1.name)
									$('.getcomment').text(res[0].eq1.comment)
									$('.getpn').text(res[0].eq1.pn)
									$('.getsn').text(res[0].eq1.sn)
									$('.getindate').text(
											res[0].indate.toString().substring(
													0, 8))
									$('.getalarmday').text(
											res[0].eq1.alarmTimeDay)
									$('.getoverdate').text(
											res[0].overdate.toString()
													.substring(0, 8))
									$('.getusername').text(
											res[0].eq1.eq_user.username)

								} else {
									alert("请求异常1");
								}

							},
							error : function(json) {
								alert("请求异常2");
							}
						})

						$('#mask2')
								.css(
										{
											"opacity" : "1",
											"z-index" : "100",
											'-webkit-transition' : 'opacity 2s ease-in,z-index 1s ease-in',
											'-moz-transition' : 'opacity 2s ease-in,z-index 1s ease-in',
											'-ms-transition' : 'opacity 2s ease-in,z-index 1s ease-in',
											'-o-transition' : 'opacity 2s ease-in,z-index 1s ease-in',
											'transition' : 'opacity 2s ease-in,z-index 1s ease-in'

										})

					})

　　

public void findByIDEquipment() {getResponse().setCharacterEncoding("UTF-8");getResponse().setContentType("text/html;charset=UTF-8");PrintWriter out;JSONObject obj = new JSONObject();JSONArray jarr = new JSONArray();ArrayList<Equipment> eq_array_list = new ArrayList<Equipment>();SimpleDateFormat sdf = new SimpleDateFormat();try {out = getResponse().getWriter();
System.out.println(eq_id);
long id = Long.valueOf(getRequest().getParameter("eq_id"));System.out.println("id is" + id);Equipment eq = eq_service.findEquipmentById(id);Equipment eq1 = eq;eq_array_list.add(eq);if (eq != null) {/* * getSession().setAttribute("eq_name", eq.getName()); * getSession().setAttribute("eq_comment", eq.getComment()); * getSession().setAttribute("eq_pn", eq.getPn()); * getSession().setAttribute("eq_sn", eq.getSn()); * getSession().setAttribute("eq_inDate", eq.getInDate()); * getSession().setAttribute("eq_alarmDay", * eq.getAlarmTimeDay()); * getSession().setAttribute("eq_overTime", eq.getOverTime()); * getSession().setAttribute("eq_username", * eq.getEq_user().getUsername()); */obj.put("eq1", eq1);obj.put("indate", sdf.format(eq1.getInDate()));obj.put("overdate", sdf.format(eq1.getOverTime()));jarr.add(obj);
out.print(jarr);out.flush();
} else {out.println(false);}
} catch (IOException e) {// TODO Auto-generated catch blocke.printStackTrace();}
}