Java基础之FastJson详解

目录一、fastJson将json格式字符串转化成List集合二、fastJson将json格式字符串转化成对象三、FastJson将对象或集合转化成json格式字符串四、FastJson将json格式字符串转化成json对象五、FastJson将json格式字符串转化成json数组六、FastJson将java对象转化成json对象一、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<AccountBean> readJson2List =JSON.parseArray(json, AccountBean.class)注意这里是Bean.class而不是List.class

@Testpublic void readJson2ListBean() {String json = '[{'address': 'address2','name':'haha2','id':2,'email':'email2'},{'address':'address','name':'haha','id':1,'email':'email'}]';List<AccountBean> 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<HashMap<String,Object>>集合

@Testpublic void readJson2ListMap() {String json = '[{'address': 'address2','name':'haha2','id':2,'email':'email2'},{'address':'address','name':'haha','id':1,'email':'email'}]';List<HashMap> 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

@Testpublic 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<String,Object>集合

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

测试：

三、FastJson将对象或集合转化成json格式字符串

@Testpublic void beanAndCollectionTOJson() {AccountBeanbean = 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

@Testpublic 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

@Testpublic 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

@Testpublic void beanAndCollectionTOJsonBean() {AccountBeanbean = 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);}

到此这篇关于Java基础之FastJson详解的文章就介绍到这了,更多相关Java FastJson内容请搜索好吧啦网以前的文章或继续浏览下面的相关文章希望大家以后多多支持好吧啦网！