Introduction to several forms of Javabean and JSON conversion-javaTutorial-php.cn

Introduction to several forms of Javabean and JSON conversion

黄舟

Release： 2017-08-23 10:26:14

Original

1821 people have browsed it

The following editor will bring you an article that discusses several forms of JSON and Javabean conversion in detail. The editor thinks it’s pretty good, so I’ll share it with you now and give it as a reference. Let’s follow the editor and take a look.

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="{&#39;name&#39;:&#39;zhangsan&#39;,&#39;age&#39;:23,&#39;interests&#39;:[{&#39;interest&#39;:&#39;篮球&#39;,&#39;colors&#39;:[&#39;绿色&#39;,&#39;黄色&#39;]},{&#39;interest&#39;:&#39;足球&#39;,&#39;colors&#39;:[&#39;红色&#39;,&#39;蓝色&#39;]}]}";
String json2="[{&#39;name&#39;:&#39;zhangsan&#39;},{&#39;name&#39;:&#39;lisi&#39;},{&#39;name&#39;:&#39;王五&#39;}]";
String json3="{&#39;1&#39;:{&#39;name&#39;:&#39;zhangsan&#39;},&#39;3&#39;:{&#39;name&#39;:&#39;lisi&#39;},&#39;4&#39;:{&#39;name&#39;:&#39;wangwu&#39;}}";//map
String json4="{&#39;name&#39;:&#39;zhangsan&#39;,&#39;age&#39;:23}";

Copy after login

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

<!-- https://mvnrepository.com/artifact/com.google.code.gson/gson -->
 <dependency>
  <groupId>com.google.code.gson</groupId>
  <artifactId>gson</artifactId>
  <version>2.8.1</version>
 </dependency>
 <!-- https://mvnrepository.com/artifact/org.json/json -->
 <dependency>
  <groupId>org.json</groupId>
  <artifactId>json</artifactId>
  <version>20170516</version>
 </dependency>

Copy after login

Secondly, the encapsulated Javabean code is as follows

import java.util.List;

public class UserBean {

 private String name;
 
 private Integer age;
 
 private List<InterestBean> 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<InterestBean> getInterests() {
  return interests;
 }

 public void setInterests(List<InterestBean> interests) {
  this.interests = interests;
 }




  class InterestBean{
  private String interest;
  
  private List<String> colors;

  public String getInterest() {
   return interest;
  }

  public void setInterest(String interest) {
   this.interest = interest;
  }

  public List<String> getColors() {
   return colors;
  }

  public void setColors(List<String> colors) {
   this.colors = colors;
  }
  
  
 }
 
}

Copy after login

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);
  
 }

Copy after login

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);

  }
 }

Copy after login

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

Copy after login

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);
  }
 }

Copy after login

/**
  * 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<InterestBean> list = user.getInterests();
  for(InterestBean bean:list) {
   System.out.println(bean.getInterest());
   List<String> colors = bean.getColors();
   for(String color:colors){
    System.out.println(color);
   }
  }
 }

Copy after login

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<Map<String,UserBean>>(){}.getType();
  Map<String,UserBean> map = gson.fromJson(json3, type);
  Set<String> keys = map.keySet();
  for(String key:keys){
   UserBean bean = map.get(key);
   System.out.println(key);
   System.out.println(bean.getName());
  }
 }

Copy after login

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<InterestBean> list = new ArrayList<InterestBean>();
  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;
 }
}

Copy after login

The above is the detailed content of Introduction to several forms of Javabean and JSON conversion. For more information, please follow other related articles on the PHP Chinese website!