详谈JSON与Javabean转换的几种形式

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

<!-- 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

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：

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
  */
 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
  */
 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;
 }

}

仅供参考，如有雷同，纯属巧合^_^

以上这篇详谈json与javabean转换的几种形式就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。