JSON 字符串 与 java 对象的转换
//json-lib-2.2-jdk15.jar
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
1. //把java 对象列表转换为json对象数组,并转为字符串
JSONArray array = JSONArray.fromObject(userlist);
String jsonstr = array.toString();
2.//把java对象转换成json对象,并转化为字符串
JSONObject object = JSONObject.fromObject(invite);
Log4jInit.ysulogger.debug(object.toString());
3.//把JSON字符串转换为JAVA 对象数组
String
personstr = getRequest().getParameter("persons");
JSONArray json =
JSONArray.fromObject(personstr);
List<InvoidPerson> persons =
(List<InvoidPerson>)JSONArray.toCollection(json, nvoidPerson.class);
4.//把JSON字符串转换为JAVA 对象
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\"}]}";
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);