详谈JSON与Javabean转换的几种形式

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}";

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

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;
  }
  
  
 }
 
}

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);
  
 }

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());
  }
 }

/**
  * 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);
   }
  }
 }

/**
  * 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());
  }
 }

/**
  * 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;
 }

}