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);}

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