学习Java工具库FastJson的使用 |
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FastJson是Java中的一个工具库,可以把Java对象转换为Json格式,同样也可以吧Json格式转换为Java对象。下面,我们来一起学习FastJson工具库的具体使用内容。 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); }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("[email protected]"); 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("[email protected]"); 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工具库FastJson使用详解的文章就介绍到这了,更多相关Java其他工具库的内容,请搜索W3Cschool以前的文章或继续浏览下面的相关文章,也希望大家以后多多支持我们! |
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