Java工具库FastJson如何使用

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一、fastJson将json格式字符串转化成List集合

注：json格式字符串必须符合数组型格式如[{"a":a},{"b":b}]

场景一：前端向后台传递数组格式的json字符串，如何转化成List集合

List readJson2List =JSON.parseArray(json, AccountBean.class)注意这里是Bean.class而不是List.class

     @Test        public void readJson2ListBean() {                String json = "[{"address": "address2","name":"haha2","id":2,"email":"email2"},{"address":"address","name":"haha","id":1,"email":"email"}]";                List readJson2List =JSON.parseArray(json, AccountBean.class);                //输出测试                JsonUtils.beanToJson(readJson2List);        }

场景二：前端向后台传递数组格式的json字符串，如何转化成List>集合

      @Test        public void readJson2ListMap() {                String json = "[{"address": "address2","name":"haha2","id":2,"email":"email2"},{"address":"address","name":"haha","id":1,"email":"email"}]";                List readJson2List =JSON.parseArray(json,HashMap.class);                //输出测试                JsonUtils.beanToJson(readJson2List);        }

二、fastJson将json格式字符串转化成对象

场景一：前端向后台传递数组格式的json字符转化成Bean对象

@Test        public void readJson2Bean() {                String json = "{"address": "address2","name":"haha2","id":2,"email":"email2"}";                AccountBean accountBean  =JSON.parseObject(json,AccountBean.class);                //输出测试                JsonUtils.beanToJson(accountBean);        }

场景二：前端向后台传递数组格式的json字符串Map集合

@Test        public void readJson2Map() {                String json = "{"address": "address2","name":"haha2","id":2,"email":"email2"}";                HashMap accountBean  =JSON.parseObject(json,Map.class);                //输出测试                JsonUtils.beanToJson(accountBean);        }

三、FastJson将对象或集合转化成json格式字符串

@Test        public void beanAndCollectionTOJson() {                AccountBean     bean = new AccountBean();                bean.setAddress("china-Guangzhou");                bean.setEmail("hoojo_@126.com");                bean.setId(1);                bean.setName("hoojo");                String json  = JSON.toJSONString(bean);                System.out.println(json);        }

四、FastJson将json格式字符串转化成json对象

@Test        public void jsonStringTOJsonBean() {                String json = "{"address": "address2","name":"haha2","id":2,"email":"email2"}";                JSONObject parse = (JSONObject) JSON.parse(json);                String address = (String) parse.get("address");                System.out.println("输出address=="+address);        }

五、FastJson将json格式字符串转化成json数组

      @Test        public void jsonString2JsonArray() {                String json = "[{"address": "address2","name":"haha2","id":2,"email":"email2"},{"address":"address","name":"haha","id":1,"email":"email"}]";                JSONArray parseArray = JSON.parseArray(json);                //输出测试                JsonUtils.beanToJson(parseArray.get(0));        }

六、FastJson将java对象转化成json对象

@Test        public void beanAndCollectionTOJsonBean() {                AccountBean     bean = new AccountBean();                bean.setAddress("china-Guangzhou");                bean.setEmail("hoojo_@126.com");                bean.setId(1);                bean.setName("hoojo");                JSONObject json  = (JSONObject) JSON.toJSON(bean);                json.get("address");                System.out.println(json);        }

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