1.java实体对象转化为json数据：

后台代码：

?? String id = request.getParameter("id");
???List<ServiceEntity> serviceList = channelService.serviceList(Integer.parseInt(id));//查询出一条实体对象

?? PrintWriter out = response.getWriter();
???JSONArray jsonArr = JSONArray.fromObject(serviceList);?????
???JSONObject json = new JSONObject();???????????
???System.out.println(jsonArr);??
???out.print(jsonArr);??
???json.put("jsonArr", jsonArr);

前台获取：

function changePDID(pdid){
??var htmlStr = "";
??var cnum=Math.ceil(Math.random()*100);
??????????? var param = {
????pdid : pdid,
????cnum : cnum
?????? }
??????????? var http_value = jQuery.param(param);
????? var url = "${pageContext.request.contextPath}/spServerAction/getServiceByPdID.do?pdid="+pdid;
?
???$.getJSON(url, http_value, function(data){
??????????????? document.getElementById("serviceid).options.length = 0;
??????????????? var htmlStr="<option>请选择</option>";
??????????????? for (i = 0; i < data.length; i++) {
??????????????????? htmlStr += "<option value='" + data[i].pdid+ "'>" + data[i].pdname+ "</option>";
??????????????? }
??????????????? $("#serviceid").append(htmlStr);
??????????? });
}

?

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2.json对象转化为java实体对象

前台代码：

function toJson(){
?var serviceid = document.getElementsByName("serviceid");
?var pdid = document.getElementsByName("pdid");
?var starttime = document.getElementsByName("starttime");
?var endtime = document.getElementsByName("endtime");
?legth=serviceid.length;
?var jsons="";
?for(var i=0;i<legth;i++){
??var serviceidvalue = serviceid[i].value;
??var pdidvalue = pdid[i].value;
??var starttimevalue = starttime[i].value;
??var endtimevalue = endtime[i].value;
??if(i==0)
???jsons+="[{serviceid:"+serviceidvalue+",pdid:"+pdidvalue+",starttime:"+starttimevalue+",endtime:"+endtimevalue+"}";
??else if(i==legth-1)
???jsons+=",{serviceid:"+serviceidvalue+",pdid:"+pdidvalue+",starttime:"+starttimevalue+",endtime:"+endtimevalue+"}]";
??else
???jsons+=",{serviceid:"+serviceidvalue+",pdid:"+pdidvalue+",starttime:"+starttimevalue+",endtime:"+endtimevalue+"}";
?}
?alert(jsons); //输出内容：[{"serviceid":5555,"pdid":135,"starttime":99,"endtime":99},{"serviceid":111,"pdid":137,"starttime":111,"endtime":111}]
?document.forms.frm_t.action="${pageContext.request.contextPath}/spServerAction/updateSpServer.do?jsons="+jsons;
?document.forms.frm_t.submit();
?
}

后台代码：

//解析json数据
???String jsons = request.getParameter("jsons");
???//JSONArray jtimesplit? = new JSONArray();
???JSONArray jtimesplit = new JSONArray().fromObject(new String(jsons));
???System.out.println(jtimesplit);
???List<SpServerServiceSplit> addSplitList = new ArrayList<SpServerServiceSplit>();
???for(int i=0;i<jtimesplit.size();i++){
????SpServerServiceSplit sptimeSplit = (SpServerServiceSplit)net.sf.json.JSONObject.toBean((net.sf.json.JSONObject) jtimesplit.get(i), SpServerServiceSplit.class);
????//sptimeSplit.setId(Integer.parseInt(id));
????sptimeSplit.setSpServer(spServer);//设一对多关系了，set一的表
????addSplitList.add(sptimeSplit);//循环加入到List集合中
????System.out.println(sptimeSplit.getPdid());
???}

spServer.setSpServerServiceSplit(addSplitList);//主表给子表赋值（List）
spServerService.insertSpServer(spServer);//只插入主表子表对应插入

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json数据转化为实体简单例子如下：

public class TestJson {

?public static void main(String args []) {
??/*
??Person p1 = new Person("张一", "23", "男","浦东张江");
??Person p2 = new Person("张二", "21", "女","宝山友谊路");
??Person p3 = new Person("张三", "26", "男","闸北");
??Person p4 = new Person("张四", "22", "女",