Java基础之FastJson详解
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
@Test public 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
@Test public 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
@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<String,Object>集合
@Test public 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
@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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