JSON 字符串 与 java 对象的转换

jsonLib 经典文章：http://json-lib.sourceforge.net/xref-test/net/sf/json/TestJSONObject.html
// 引入相应的包 json-lib-2.2.3.jar

对象转json：

IorderIssue iorderIssue = new IorderIssue();

SegmentInfo segmentInfo = new SegmentInfo();
segmentInfo.setIorderIssue(iorderIssue);
List<SegmentInfo> list = new ArrayList<SegmentInfo>();
list.add(segmentInfo);
iorderIssue.setSegmentInfos(list);

List<ReqPassenger> list1 = new ArrayList<ReqPassenger>();
ReqPassenger reqPassenger = new ReqPassenger();
reqPassenger.setBusinessNo("111");
reqPassenger.setIorderIssue(iorderIssue);
list1.add(reqPassenger);
iorderIssue.setReqPassengers(list1);

JsonConfig conf = new JsonConfig();
conf.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);
JSONObject object = JSONObject.fromObject(iorderIssue,conf);

其中conf.setCycleDetectionStrategy(CycleDetectionStrategy.LENIENT);可防止hibernate模式下的关联关系子对象中包含父对象造成死循环。

json转对象：

1.这个方法 JSONSerializer.toJava();

/**
* 创建订单
* @param request
* @param response
* @return
* @throws Exception
*/
public ModelAndView createOrder(HttpServletRequest request,
HttpServletResponse response) throws Exception {
String requestStr = MyString.inputStream2String(request.getInputStream());

JsonConfig filterNullConfig = new JsonConfig();//先把为null的属性过滤掉，防止下边的日期转换报错
filterNullConfig.setJsonPropertyFilter(new PropertyFilter() {

public boolean apply(Object clazz, String name, Object value) {
boolean isFilter = false;
if(value==null||"".equals(value)){
isFilter = true;
}
return isFilter;
}
});
JSONObject requestJson = JSONObject.fromObject(requestStr,filterNullConfig);

try{
//日期转换
String[] dateFormats = new String[] {"yyyy-MM-dd HH:mm:ss","yyyy-MM-dd","yyyy-MM-dd HH:mm"};
JSONUtils.getMorpherRegistry().registerMorpher(new DateMorpher(dateFormats));

JsonConfig jsonConfig = new JsonConfig();
jsonConfig.setRootClass(IorderIssue.class);
Map<String, Class> classMap = new HashMap<String, Class>();
classMap.put("iordersegments", IorderSegment.class);
classMap.put("iorderpassengers", IorderPassenger.class);
jsonConfig.setClassMap(classMap);

IorderIssue iorderIssue = (IorderIssue)JSONSerializer.toJava(requestJson,jsonConfig);
iorderIssue.setCreateTime(new Date());

iorderIssue.setOrderType("01");//出票订单
String isAduting = iorderIssue.getIsAduting();
if("1".equals(isAduting)){
iorderIssue.setOrderStatus("000");//待审核
}else if("0".equals(isAduting)){
iorderIssue.setOrderStatus("001");//待支付
}

IorderPriceIssue iorderPriceIssue = iorderIssue.getIorderPriceIssue();

String orderId = iorderIssueManager.saveIorderIssue(iorderIssue, iorderPriceIssue,user);

if(MyString.isNoEmpty(orderId)){//如果返回id，保存行程单信息
IorderJourneyInfo iorderJourneyInfo = iorderIssue.getIorderJourneyInfo();
iorderJourneyInfo.setBusinessId(orderId);
this.universalManager.save(iorderJourneyInfo);
}

MyJSONTools.responseWriteData(response, "OKφ"+orderId);
}catch(Exception e){
e.printStackTrace();
MyJSONTools.responseWriteData(response, "error:"+e.getMessage());
}
return null;
}

2.

jsonWorkflowBean是json字符串

// 转换成Json对象
JSONObject jsonObj = JSONObject.fromObject(jsonWorkflowBean);/*
* 在JSONObject.toBean的时候如果转换的类中有集合,可以先定义Map<String, Class> classMap
* = new HashMap<String,
* Class>();在classMap中put你要转换的类中的集合名,像:classMap.put("teachers",
* Teacher.class);然后在toBean()的时候把参数加上, 像:Student student=(Student)
* JSONObject.toBean(str, Student.class, classMap);
*/
Map<String, Class> classMap = new HashMap<String, Class>();
classMap.put("inputDataList", InputDataBean.class);
classMap.put("imageList", ImageBean.class);
//将json转换成workflowBean
WorkflowBean workflow = (WorkflowBean) JSONObject.toBean(jsonObj,
WorkflowBean.class, classMap);

jsonarray转list：

JSONObject requestJson = JSONObject.fromObject(requestStr);

String reqPassengers = requestJson.getString("reqPassengers");

Map<String, Class> classMap = new HashMap<String, Class>();
classMap.put("reqPassengers", ReqPassenger.class);

JSONArray jsonArray = JSONArray.fromObject(reqPassengers);

List<ReqPassenger> list = (List<ReqPassenger>)JSONArray.toCollection(jsonArray);