json数据的拼接与解析

json数据格式

 [{ "firstName": "Brett", "lastName":"McLaughlin", "email": "aaaa" },

{ "firstName": "Jason", "lastName":"Hunter", "email": "bbbb"},

{ "firstName": "Elliotte", "lastName":"Harold", "email": "cccc" }]

一、前台js代码（数据存储与json拼接）

以OutStoDetail类为例

var proDetail=[];//大的集合
var obj=new Object();

obj.outstodeid=outstodeid;  //对象属性
obj.proname=proname;
obj.proprice=proprice;
obj.procount=procount;
obj.proamount=proamount;
obj.storagenum=storagenum;
obj.localnum=localnum;
proDetail.push(obj );   //对象放入集合

$("#btnSave").click(function(){
    var jsonStr="[";
    for(i=0;i<proDetail.length;i++){
        jsonStr+="{";
        jsonStr+=""outstodeid":""+proDetail[i].outstodeid+"",";
        jsonStr+=""proname":""+proDetail[i].proname+"",";
        jsonStr+=""proprice":""+proDetail[i].proprice+"",";
        jsonStr+=""procount":""+proDetail[i].procount+"",";
        jsonStr+=""proamount":""+proDetail[i].proamount+"",";
        jsonStr+=""storagenum":""+proDetail[i].storagenum+"",";
        jsonStr+=""localnum":""+proDetail[i].localnum+""";
        jsonStr+="}";
        if(i!=proDetail.length-1) jsonStr+=",";
    }
    jsonStr+="]";
        $.ajax({
        type:"post",
        url:'<%=basePath%>outStore/updateOrAdd.action?jsonStr='+jsonStr,
        success:function(data,status){}
    });
});

拼接json串时注意引号的拼接。

二、后台java代码（json数据解析）

1、在maven项目pom.xml中添加如下依赖

<!-- https://mvnrepository.com/artifact/org.json/json -->
    <dependency>
        <groupId>org.json</groupId>
        <artifactId>json</artifactId>
        <version>20170516</version>
    </dependency>

或下载org.json的jar包

2、在controller中对json数据进行解析

引入包

import org.json.JSONArray;
import org.json.JSONObject;

List<OutStoDetail> outSDList=new ArrayList<OutStoDetail>();
JSONArray js = new JSONArray(jsonStr);
for (int i = 0; i < js.length(); i++) {
　　JSONObject ob = js.getJSONObject(i);
　　OutStoDetail outStoDetail=new OutStoDetail();
　　//outStoDetail.setOutstodeid(Integer.parseInt((String) ob.get("outstodeid")));
　　outStoDetail.setProname((String)ob.get("proname"));
　　outStoDetail.setProprice(Float.parseFloat((String)ob.get("proprice")));
　　outStoDetail.setProcount(Float.parseFloat((String)ob.get("procount")));
　　outStoDetail.setProamount(Float.parseFloat((String)ob.get("proamount")));
　　outStoDetail.setStoragenum((String)ob.get("storagenum"));
　　outStoDetail.setLocalnum((String)ob.get("localnum"));
　　outStoDetail.setOutstonum(outStor.getOutstonum());
　　outSDList.add(outStoDetail);
}

获取到OutStoDetail类型的集合就可以使用了。