json转换总结

@requestMapping的produces和consumes属性:

produces：它的作用是指定返回值类型，不但可以设置返回值类型还可以设定返回值的字符编码；

consumes：指定处理请求的提交内容类型（Content-Type），例如application/json, text/html;

前端请求json转换成Bean对象报错的解决:

@RequestMapping(value = "???", consumes = "application/json;charset=utf-8")

JSON.parseObject : 将Json字符串转化为相应的对象(fastjson)

String jsonString = "{name:'Antony',age:'12',sex:'male',telephone:'88888'}";
Staff staff = JSON.parseObject(jsonString, Staff.class);

JSON.toJSONString : 将对象转化为Json字符串(fastjson)

String jsonStr = JSON.toJSONString(staff);

java 对象列表转换为json对象数组，并转为字符串(json-lib)

JSONArray array = JSONArray.fromObject(userlist);
String jsonstr = array.toString();

java对象转换成json对象，并转化为字符串(json-lib)

JSONObject object = JSONObject.fromObject(invite);
String str=object.toString());

JSON字符串转换为JAVA 对象数组(json-lib)

String personstr = getRequest().getParameter("persons");
JSONArray json = JSONArray.fromObject(personstr);
List<InvoidPerson> persons = (List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);

JSON字符串转换为JAVA 对象(json-lib)

JSONObject jsonobject = JSONObject.fromObject(str);
PassportLendsEntity passportlends = null;
try {
   //获取一个json数组
   JSONArray array = jsonobject.getJSONArray("passports");
   //将json数组转换成 List<PassPortForLendsEntity>泛型
   List<PassPortForLendsEntity> list = new ArrayList<PassPortForLendsEntity>();
   for (int i = 0; i < array.size(); i++) {
            JSONObject object = (JSONObject)array.get(i);
            PassPortForLendsEntity passport = (PassPortForLendsEntity)JSONObject.toBean(object,
              PassPortForLendsEntity.class);
            if(passport != null){
             list.add(passport);
            }
     }
   //转换PassportLendsEntity 实体类
passportlends = (PassportLendsEntity)JSONObject.toBean(jsonobject, PassportLendsEntity.class);

str = "{\"lendperson\":\"李四\",\"lendcompany\":\"有限公司\",\"checkperson\":\"李四\",

\"lenddate\":\"2010-07-19T00:00:00\",\"lendcounts\":4,\"
passports\":[{\"passportid\":\"d\",\"name\":\"李豫川\",\"passporttype\":\"K\"},
{\"passportid\":\"K9051\",\"name\":\"李平\",\"passporttype\":\"K\"},
{\"passportid\":\"K90517\",\"name\":\"袁寒梅\",\"passporttype\":\"K\"},
{\"passportid\":\"K905199\",\"name\":\"贺明\",\"passporttype\":\"K\"}]}";

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