【0】README

1) springmvc sends or receives data by ajax request using json format;

【1】 ajax function

<script type="text/javascript">var checkoutUserlistIsAccess = false;$(document).ready(function(){	$("#first").hide();if(checkoutUserlistIsAccess==false) {checkoutUserlist(); // checkout user list.}/* bind event to input with id searched *//* $("#search").bind("click", function() {$("#second").hide();$("div[id^='first']").hide();});$("#search").bind("blur", function() {$("#second").show();$("div[id^='first']").hide();}); */});//ajax 访问函数var member;function checkoutUserlist(){checkoutUserlistIsAccess = true;var userid=1;// alert("request for user list by ajax.");var url = "<c:url value='/chat/userlist' />"; //请求的地址 $.post(url,{keyword:userid //[逗号 连接 ]},function(data){ // 回调函数 .member = data;for(var i=0; i<data.length; i++) {appendAIntoDiv("second_userlist", data[i]);}},"json"); }// append <a> into a div.function appendAIntoDiv(objId, value) {$("#"+objId).append("<a href='<c:url value='/chat/single?touser=" + value + "'/>' class='list-group-item'>    " + value +"</a>");}		</script>

【2】method sending data via json format defined in springmvc controller

// ajax requests for user list (by json format).@RequestMapping(value="/userlist", method=RequestMethod.POST, produces="application/json")public @ResponseBody String checkoutUserlist() {List<String> list = repository.checkoutUserlist();ObjectMapper mapper = new ObjectMapper();try {String json_result = mapper.writeValueAsString(list);System.out.println(json_result);return json_result;} catch (JsonProcessingException e) {e.printStackTrace();return null;}}

【3】method receiving data via json format defined in springmvc controller