Introduction to several forms of Javabean and JSON conversion

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JSON format data transfer is one of the most commonly used methods. The following lists several commonly used forms and conversions with Javabeans:

String json1="{'name':'zhangsan','age':23,'interests':[{'interest':'篮球','colors':['绿色','黄色']},{'interest':'足球','colors':['红色','蓝色']}]}"; String json2="[{'name':'zhangsan'},{'name':'lisi'},{'name':'王五'}]"; String json3="{'1':{'name':'zhangsan'},'3':{'name':'lisi'},'4':{'name':'wangwu'}}";//map String json4="{'name':'zhangsan','age':23}";

First of all, the transformation here relies on two JAR packages

  com.google.code.gson gson 2.8.1    org.json json 20170516 

Secondly, the encapsulated Javabean code is as follows

import java.util.List; public class UserBean { private String name; private Integer age; private List interests; public String getName() { return name; } public void setName(String name) { this.name = name; } public Integer getAge() { return age; } public void setAge(Integer age) { this.age = age; } public List getInterests() { return interests; } public void setInterests(List interests) { this.interests = interests; } class InterestBean{ private String interest; private List colors; public String getInterest() { return interest; } public void setInterest(String interest) { this.interest = interest; } public List getColors() { return colors; } public void setColors(List colors) { this.colors = colors; } } }

1. JSON parsing in ordinary json4 format:

public void testParseJson(){ JSONObject jsonObj = new JSONObject(json4); String name = jsonObj.getString("name"); int age = jsonObj.getInt("age"); System.out.println(name); System.out.println(age); UserBean user = new UserBean(); user.setAge(age); user.setName(name); }

2. JSON parsing in array form and GSON parsing:

public void testJsonArray(){ JSONArray jsonArray = new JSONArray(json2); for (int i = 0; i < jsonArray.length(); i++) { JSONObject jsonObj = jsonArray.getJSONObject(i); String name = jsonObj.getString("name"); System.out.println(name); } }

/** * 解析json数组 */ public void testParseListJson(){ Gson gson = new Gson(); Type type = new TypeToken>(){}.getType(); List users = gson.fromJson(json2, type); for(UserBean user:users){ System.out.println(user.getName()); } }

3. JSON and GSON parsing in embedded JSON form:

/** * 内嵌JSON解析 */ public void testParseJson1(){ JSONObject rootJson = new JSONObject(json1); JSONArray jsonInterestArray = rootJson.getJSONArray("interests"); for (int i = 0; i < jsonInterestArray.length(); i++) { JSONObject interestJsonObj = jsonInterestArray.getJSONObject(i); String interest = interestJsonObj.getString("interest"); System.out.println(interest); Object obj = interestJsonObj.get("colors"); System.out.println(obj); } }

/** * 内嵌GSON解析 */ public void testSimpleJson(){ Gson gson = new Gson(); UserBean user = gson.fromJson(json1, UserBean.class); System.out.println(user.getName()); System.out.println(user.getAge()); System.out.println(user.getInterests().size()); List list = user.getInterests(); for(InterestBean bean:list) { System.out.println(bean.getInterest()); List colors = bean.getColors(); for(String color:colors){ System.out.println(color); } } }

4. GSON parsing of JSON in Map form:

/** * 解析一个map类型的json */ public void testParseMapJson(){ Gson gson = new Gson(); Type type = new TypeToken>(){}.getType(); Map map = gson.fromJson(json3, type); Set keys = map.keySet(); for(String key:keys){ UserBean bean = map.get(key); System.out.println(key); System.out.println(bean.getName()); } }

5. Encapsulate a JavaBean object into JSON format

/** * 将一个JavaBean对象封装成JSON格式 */ public String testJavaBean2Json(){ UserBean userBean = new UserBean(); userBean.setName("zhangsan"); userBean.setAge(33); List list = new ArrayList(); InterestBean bean1 = new UserBean().new InterestBean(); bean1.setInterest("篮球1"); InterestBean bean2 = new UserBean().new InterestBean(); bean2.setInterest("篮球2"); list.add(bean1); list.add(bean2); userBean.setInterests(list); //将User Bean转换成Json Gson gson = new Gson(); String jsonStr = gson.toJson(userBean); System.out.println(jsonStr); return jsonStr; } }

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