JSON与Javabean转换的几种形式 -

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JSON与Javabean转换的几种形式

JSON与Javabean转换

JSON格式的数据传递是最常用的方法之一，以下列出了常用的几种形态以及与Javabean之间的转换：

　　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}";

首先，此处的转化依赖两个JAR包

 
   <!-- (官网：www.fhadmin.org) 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> 

其次，封装的Javabean代码如下(官网：www.fhadmin.org)

 
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;
       }
       
       
   }
   
} 

1、普通的json4格式的JSON解析(官网：www.fhadmin.org)：

 
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、数组形式的JSON解析以及GSON解析：

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(官网：www.fhadmin.org)
    */
   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());
       }
   } 

3、内嵌JSON形式的JSON与GSON解析：

 
/**
    * 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(官网：www.fhadmin.org)
    */
   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);
           }
       }
   } 

4、Map形式的JSON的GSON解析：

 
   /**
    * 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());
       }
   } 

5、将一个JavaBean对象封装成JSON格式

 
   /**
    * 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;
   }

} 