//取得
标签中的文本内容[jquery对象->dom对象，方法二]var $div = $(“#divID”);//jQuery对象
var divElement = $div.get(0);//DOM对象
var html = divElement.html();
alert(html);
Dom原生Ajax请求
function getHTTPObject(){
if(typeof XMLHttpRequest == “undefined”){
XMLHttpRequest = new ActiveXObject(“MSXML2.XMLHTTP”); //兼容IE
}
return new XMLHttpRequest();
}
//获取服务端数据
function getContent(){
var request = getHTTPObject();
if(request){
//第一个参数是访问请求类型GET POST SEND,
//第二个参数是数据来源地址，一般指服务器接口
//第三个参数代表是否异步方式发送和处理
request.open(“GET”, “data.json”, true);
request.onreadystatechange = function(){
//readyState有5种值，0是未初始化 1是正在加载 2是加载完毕 3是正在交互 4是完成
if(request.readyState == 4){
console.log(request.responseText);
}
};
request.send(null);
}else{
alert(“Sorry, Error”);
}
}
jquery的Ajax请求
function findAllDepts() {
$.ajax({
async : false, //表示请求是否异步处理
type : “post”, //请求类型
url : “/getDepts”,//请求的 URL地址
dataType : “json”,//返回的数据类型
success: function (data) {
console.log(data); //在控制台打印服务器端返回的数据
for(var i=0;i<data.length;i++){
console.log(data[i].deptId+" "+data[i].deptName);
}
$(“select[name=‘depertmentId’]”).empty();
$(“select[name=‘depertmentId’]”).append(‘——请选择——’);
for(var i=0;i<data.length;i++){
var html =‘’;
html +=data[i].deptName + ‘’;
$(“select[name=‘departmentId’]”).append(html); //将数据显示在html页面
}
},
error:function (data) {
alert(data.result);
}
});
};
$(document).ready(function () {
findAllDepts(); //页面加载完成就执行该方法
});
服务端原生代码：
//Java代码：后台获取单个数控定位器的历史表格的数据
//请求路径看get(),post()里面的逻辑分配
public void getHistorySingleData() throws IOException{
HttpServletRequest request = ServletActionContext.getRequest();
HttpServletResponse response = ServletActionContext.getResponse();
response.setHeader(“Content-type”, “text/html;charset=UTF-8”);
response.setContentType(“text/html;charset=utf-8”);
String deviceName = request.getParameter(“deviceName”);
String startDate= request.getParameter(“startDate”);
String endDate = request.getParameter(“endDate”);
SingleHistoryData[] singleHistoryData = chartService.getHistorySingleData(deviceName,startDate, endDate);
System.out.println(singleHistoryData.length);
System.out.println(JSONArray.fromObject(singleHistoryData).toString());
//打印：[{“time”:“2016-11-11 10:00:00”,“state”:“运行”,“ball”:“锁紧”,…},{“time”:“2016-11-11 10:00:05”,“state”:“运行”,“ball”:“锁紧”,…},{},{}…]查到几条singleHistoryData对象就打印几个对象的信息{“time”:“2016-11-11 10:00:05”,“state”:“运行”,“ball”:“锁紧”,…}
//将json数据回传给回调函数
response.getWriter().print(JSONArray.fromObject(singleHistoryData).toString());
}
SSM代码：
msg类：
package com.xiaoyu.shop.bean;
import java.util.HashMap;
import java.util.Map;
/**
-
通知返回类
-
@author Administrator
*/
public class Msg {
//状态码 100-成功 200-失败
private int code;
//提示信息
private String msg;
//用户要返回给浏览器的数据
private Map<String, Object> extend = new HashMap<String, Object>();
public static Msg success(){
Msg result = new Msg();
result.setCode(100);
result.setMsg(“处理成功！”);
return result;
}
public static Msg fail(){
Msg result = new Msg();
result.setCode(200);
result.setMsg(“处理失败！”);
return result;
}
public Msg add(String key,Object value){
this.getExtend().put(key, value);
return this;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public Map<String, Object> getExtend() {
return extend;
}
public void setExtend(Map<String, Object> extend) {
this.extend = extend;
}
}
将json数据回传给回调函数的方法：
package com.xiaoyu.shop.controller;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import com.xiaoyu.shop.bean.Msg;
@Controller
public class AdminController {
/**
-
管理员登录
-
/adminlogin : 请求路径
*/
@RequestMapping(“/adminlogin”)
@ResponseBody
public Msg userLogin(@RequestParam(value = “adminName”) String adminName,
@RequestParam(value = “adminPassword”) String adminPassword) {
System.out.println(adminName + “+” + adminPassword);
if (adminName.equals(“admin”) && adminPassword.equals(“admin”)) {
return Msg.success().add(“msg”, “管理员登录成功”);
} else {
return Msg.fail().add(“msg”, “管理员登录失败”);
}
}
}
SpringBoot代码：
msg类参考ssm的msg类。
