SpringBoot项目:pom.xml添加依赖;

commons-beanutilscommons-beanutils1.9.3

commons-collectionscommons-collections3.2.1

commons-langcommons-lang2.6

commons-loggingcommons-logging1.1.1

net.sf.ezmorphezmorph1.0.6

net.sf.json-libjson-lib2.2.3jdk15

导包 : 切记不要导错包,
错误包 : import com.alibaba.fastjson.JSONObject;

正确的包如下:
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

Json字符串格式化 : www.bejson.com
网页版:Json字符串格式化链接

案例如下:直接上代码:

package com.itheima;import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
import java.util.ArrayList;
import java.util.List;/** 解析JSON字符串,json-->Object* 1.确定需要解析的JSON是对象还是数组;* 2.如果是对象,则使用JSONObject类;* 3.如果是数组,则使用JSONArray类;* */public class JsonTest {public static void main(String[] args) {//对象格式的json字符串String personStr = "{\"name\":\"小红\",\"age\":18,\"address\":\"西安\"}"; //对象格式的json字符串String fruits = "{\"苹果\",\"香蕉\",\"橘子\"}";//复杂的json格式String p = "{\"name\":\"小赖\",\"age\":18,\"books\":[{\"bookName\":\"Java从入门\",\"price\":29.90},{\"bookName\":\"MySQL入门\",\"price\":39.90}]}";//解析json对象字符串JSONObject jsonObject = JSONObject.fromObject(personStr);String name = jsonObject.getString("name");System.out.println(name);int age = jsonObject.getInt("age");System.out.println(age);String address = jsonObject.getString("address");System.out.println(address);//解析json数组字符串;JSONArray jsonArray = JSONArray.fromObject(fruits);for (int i = 0; i < jsonArray.size(); i++) {System.out.println()jsonArray.getString(i);}//复杂json解析方式一://解析复杂的json字符串;-->Person(nane,age,List)Person person = new Person();JSONObject json = JSONObject.fromObject(p); String name = json.getString("name");int age = json.getInt("age");person.setName(name);person.setAge(age);//解析图书List books = new ArrayList<>();JSONArray jsonArray = jsonObject.getJSONArray("books");for (int j = 0; j < jsonArray.size(); j++) {Book book = new Book();JSONObject bookObject = jsonArray.getJSONObject(j);String bookName = bookObject.getString("bookName");double price = bookObject.getDouble("price");book.setBookName(bookName);book.setPrice(price);//添加集合books.add(book);     }person.setBooks(books);   System.out.println(person);//复杂json解析方式二:反射实现;JSONObject json = JSONObject.fromObject(p); Person person = (Person)JSONObject.toBean(json,Person.class);System.out.println(person);String p2 = "[{\"name\":\"小婷\",\"age\":24},{\"name\":\"小桐\",\"age\":26}]";List persons = (List)JSONArray.toCollection(JSONArray.fromObject(p2),Person.class);System.out.println(persons);}
}

解析过程需创建的对象:Person

package com.itheima;import java.util.List;public class Person {private String name;private int age;private List books;public Person() {super();// TODO Auto-generated constructor stub}public Person(String name, int age, List books) {super();this.name = name;this.age = age;this.books = books;}public String getName() {return name;}public void setName(String name) {this.name = name;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public List getBooks() {return books;}public void setBooks(List books) {this.books = books;}@Overridepublic String toString() {return "Person [name=" + name + ", age=" + age + ", books=" + books + "]";}}

解析过程需创建的对象:Book

package com.itheima;public class Book {private String bookName;private double price;public Book() {super();}public Book(String bookName, double price) {super();this.bookName = bookName;this.price = price;}public String getBookName() {return bookName;}public void setBookName(String bookName) {this.bookName = bookName;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}@Overridepublic String toString() {return "Book [bookName=" + bookName + ", price=" + price + "]";}
}