JAVA对象JSON数据互相转换的四种常见情况
1. 把java 对象列表转换为json对象数组，并转为字符串
代码如下:
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 代码如下:
JSONObject object = JSONObject.fromObject(invite); String str=object.toString());
3.把JSON字符串转换为JAVA 对象数组 代码如下:
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 代码如下:
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\"}]}";
相关的jar包：
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