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JSON字符串与java对象的转换

2024-07-12 13:41:10   223人阅读

所需的jar包： 

1、commons-lang.jar 2、commons-beanutils.jar 3、commons-collections.jar 4、commons-logging.jar 5、ezmorph.jar 6、json-lib-2.2.2-jdk15.jar

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);


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