gson | 易学教程

GSON throwing “Expected BEGIN_OBJECT but was BEGIN_ARRAY”?

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问题 I'm trying to parse a JSON string like this one [ { "updated_at":"2012-03-02 21:06:01", "fetched_at":"2012-03-02 21:28:37.728840", "description":null, "language":null, "title":"JOHN", "url":"http://rus.JOHN.JOHN/rss.php", "icon_url":null, "logo_url":null, "id":"4f4791da203d0c2d76000035", "modified":"2012-03-02 23:28:58.840076" }, { "updated_at":"2012-03-02 14:07:44", "fetched_at":"2012-03-02 21:28:37.033108", "description":null, "language":null, "title":"PETER", "url":"http://PETER.PETER.lv

Converting JSON data to Java object

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问题 I want to be able to access properties from a JSON string within my Java action method. The string is available by simply saying myJsonString = object.getJson() . Below is an example of what the string can look like: { 'title': 'ComputingandInformationsystems', 'id': 1, 'children': 'true', 'groups': [{ 'title': 'LeveloneCIS', 'id': 2, 'children': 'true', 'groups': [{ 'title': 'IntroToComputingandInternet', 'id': 3, 'children': 'false', 'groups': [] }] }] } In this string every JSON object

了解Spring Boot的自动配置

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摘自： https://www.jianshu.com/p/ddb6e32e3faf Spring Boot的自动配置给开发者带来了很大的便利，当开发人员在pom文件中添加starter依赖后，maven或者gradle会自动下载很多jar包到classpath中。当Spring Boot检测到特定类的存在，就会针对这个应用做一定的配置，自动创建和织入需要的spring bean到程序上下文中。在之前的文章中，我们只是在pom文件中增加各种starter的依赖，例如： spring-boot-starter-data-jpa, spring-boot-starter-web, spring-boot-starter-data-test 等等。接下来将在之前的工程的基础上，观察在程序的引导启动过程中，Spring Boot通过自动配置机制帮我们做了哪些工作。 How Do Spring Boot启动时将自动配置的信息通过DEBUG级别的日志打印到控制台。可以通过设置环境变量（DEBUG）或者程序属性（--debug）设置程序的日志输出级别。在项目目录下运行 DEBUG=true mvn spring-boot:run 启动应用程序；在后台可以看到DEBUG级别的日志输出，在启动日志的最后，可以看到类似 AUTO-CONFIGURATION REPORT 的字样。

如何在Java中解析JSON

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【推荐】2019 Java 开发者跳槽指南.pdf(吐血整理) >>> 我有以下JSON文本。如何解析它以获得 pageName ， pagePic ， post_id 等的值？ { "pageInfo": { "pageName": "abc", "pagePic": "http://example.com/content.jpg" }, "posts": [ { "post_id": "123456789012_123456789012", "actor_id": "1234567890", "picOfPersonWhoPosted": "http://example.com/photo.jpg", "nameOfPersonWhoPosted": "Jane Doe", "message": "Sounds cool. Can't wait to see it!", "likesCount": "2", "comments": [], "timeOfPost": "1234567890" } ] } #1楼 quick-json解析器非常简单，灵活，快速且可自定义。试试吧特征：符合JSON规范（RFC4627）高性能JSON解析器支持灵活/可配置的解析方法可配置验证任何JSON层次结构的键/值对易于使用＃占地面积小提高开发人员友好性并易于跟踪异常

How use database in Javascript and JSF?

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问题 I'm trying to follow the @BalusC advice here. (I'm writing here now because it's unrelated with previous question). So I need to get data from my database and show in chart using JavaScript, this is an example. I'm just doing this sample so I can understand how to show some data from the server side to the client side. My bean: @ManagedBean(name="reportc") @ViewScoped public class ReportControl implements Serializable { private static final long serialVersionUID = 3269125738504434502L;

Using GSON to parse Json into a JAVA Object where the Json Elements may vary

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问题 I am trying to parse a JSON .txt file into a JAVA object using GSON. The JSON file has the following structure: { "event0" : { "a" : "abc", "b" : "def" }, "event1" : { "a" : "ghi", "b" : "jkl", "c" : "mno" } } I have read the text file into a String called dataStr. I want to use the fromJson method to capture the events into the following JAVA class: public class Event { private String a; private String b; private String c; public Event() {} } The problem is that the JSON might have one extra

How to use Gson to parse a list of json objects with nested arrays

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问题 I am new to Gson and not very experienced with java. I have a list of json objects and then lists inside each object like this: [ { "A": 358584, "B": "Apache", "C": [ "Ethnicity", "Ethnicity in fiction", "American Indian group" ], "D": 23.647824738317627, "E": "Ethnicity", "F": "Apache" }, { "A": 19283806, "B": "San Jose", "C": [ "Location", "Employer", "Region", "Transit Service Area" ], "D": 11.184500611578535, "E": "Location", "F": "San Francisco Bay Area" } ] I would appreciate a detailed

Flatten a JSON string to Map<String, String> using Gson or Jackson

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问题 For example: { "id" : "123", "name" : "Tom", "class" : { "subject" : "Math", "teacher" : "Jack" } } I want to get the Map<String, String> : "id" : "123", "name" : "Tom", "subject" : "Math", "teacher" : "Jack" 回答1: I'm not sure if something exists out of the box (speaking about Gson). However you could write a custom recursive deserializer: Type t = new TypeToken<Map<String, String>>(){}.getType(); Gson gson = new GsonBuilder().registerTypeAdapter(t, new FlattenDeserializer()).create(); Map

Expected BEGIN_ARRAY but was BEGIN_OBJECT | ArrayList issue

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问题 I'm using the Gson library to save and retrieve an ArrayList of Players Objects. My onStop() @Override protected void onStop() { super.onStop(); SharedPreferences prefs = getSharedPreferences("X", MODE_PRIVATE); SharedPreferences.Editor editor = prefs.edit(); Gson gson = new Gson(); String guardJSON = gson.toJson(playersNoGuard); editor.putString(GUARD, guardJSON); editor.putString("lastActivity", getClass().getName()); editor.apply(); } My onCreate important part ArrayList<Player>

JSON parser read an entry by entry from large JSON file

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问题 I have a huge JSON file (1GB) which is basically an array of objects in the below format [{"x":"y", "p":"q"}, {"x1":"y1", "p1":"q1"},....] I want to parse this file such the all the data is not loaded in memory. Basically I want to get for eg: first 1000 objects in the array to memory process it and then get the next 1000 objects into the memory process it and so on util all data is read. Is there any JSON library that supports this use case? I currently use Gson . However it loads all the