常用类型 类型一：JavaBean 类型二：List<JavaBean> 类型三:List<String> 类型四:List<Map<String,Object>> 将上面的四种数据对象转换成json字符串的方法都是一样的 String jsonString = JSON.toJSONString(obj); 方法/步骤 1 将json字符串转化成JavaBean对象 Person person = new Person("1","fastjson",1); //这里将javabean转化成json字符串 String jsonString = JSON.toJSONString(person); //这里将json字符串转化成javabean对象,person =JSON.parSEObject(jsonString,Person.class); 2 将json字符串转化成List<JavaBean>对象 Person person1 = new Person("1","fastjson1",1); Person person2 = new Person("2","fastjson2",2); List<Person> persons = new ArrayList<Person>(); persons.add(person1); persons.add(person2); String jsonString = JSON.toJSONString(persons); System.out.println("json字符串:"+jsonString); //解析json字符串 List<Person> persons2 = JSON.parseArray(jsonString,Person.class); 3 将json字符串转化成List<String>对象 List<String> list = new ArrayList<String>(); list.add("fastjson1"); list.add("fastjson2"); list.add("fastjson3"); String jsonString = JSON.toJSONString(list); System.out.println("json字符串:"+jsonString); //解析json字符串 List<String> list2 = JSON.parSEObject(jsonString,new TypeReference<List<String>>(){}); 4 将json字符串转化成List<Map<String,Object>>对象 Map<String,Object> map = new HashMap<String,Object>(); map.put("key1","value1"); map.put("key2","value2"); Map<String,Object> map2 = new HashMap<String,Object>(); map2.put("key1",1); map2.put("key2",2); List<Map<String,Object>> list = new ArrayList<Map<String,Object>>(); list.add(map); list.add(map2); String jsonString = JSON.toJSONString(list); System.out.println("json字符串:"+jsonString); //解析json字符串 List<Map<String,Object>> list2 = JSON.parSEObject(jsonString,new TypeReference<List<Map<String,Object>>>(){});