Java 语言 ArrayList 和 JSONArray 相互转换

Student 实体类

/*** @author Miracle Luna* @version 1.0* @date 2019/7/5 18:06*/
public class Student {private String name;     // 姓名private Integer age;     // 年龄private String gender;   // 性别public Student(String name, Integer age, String gender) {this.name = name;this.age = age;this.gender = gender;}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 String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}@Overridepublic String toString() {return "Student{" +"name='" + name + '\'' +", age=" + age +", gender='" + gender + '\'' +'}';}
}

ArrayList 转成 JSONArray

简单总结了 6 种 方法（推荐第5、6种），代码如下：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;import java.util.ArrayList;/*** @author Miracle Luna* @version 1.0* @date 2019/7/5 17:43*/
public class ArrayListToJSONArray {public static void main(String[] args) {ArrayList<Student> studentList = new ArrayList<Student>();JSONArray studentJsonArray = new JSONArray();Student John = new Student("John", 16,"boy");Student Lily = new Student("Lily", 17, "girl");Student Jack = new Student("Jack", 18, "boy");studentList.add(John);studentList.add(Lily);studentList.add(Jack);System.out.println("=============== studentList info ================");System.out.println(studentList.toString());// 方式 1studentJsonArray = JSON.parseArray(JSONObject.toJSONString(studentList));System.out.println("\n方式 1: " + studentJsonArray.toJSONString());// 方式 2studentJsonArray = JSON.parseArray(JSON.toJSONString(studentList));System.out.println("\n方式 2: " + studentJsonArray.toJSONString());// 方式 3studentJsonArray = JSONObject.parseArray(JSONObject.toJSONString(studentList));System.out.println("\n方式 3: " + studentJsonArray.toJSONString());// 方式 4studentJsonArray = JSONObject.parseArray(JSON.toJSONString(studentList));System.out.println("\n方式 4: " + studentJsonArray.toJSONString());// 方式 5studentJsonArray = JSONArray.parseArray(JSONObject.toJSONString(studentList));System.out.println("\n方式 5: " + studentJsonArray.toJSONString());// 方式 6studentJsonArray = JSONArray.parseArray(JSON.toJSONString(studentList));System.out.println("\n方式 6: " + studentJsonArray.toJSONString());System.out.println("\n============== Lambda 表达式 遍历 JSONArray ============");studentJsonArray.forEach(student -> System.out.println("student info: " + student));}
}

执行结果如下：

=============== studentList info ================
[Student{name='John', age=16, gender='boy'}, Student{name='Lily', age=17, gender='girl'}, Student{name='Jack', age=18, gender='boy'}]方式 1: [{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]方式 2: [{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]方式 3: [{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]方式 4: [{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]方式 5: [{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]方式 6: [{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]============== Lambda 表达式 遍历 JSONArray ============
student info: {"gender":"boy","name":"John","age":16}
student info: {"gender":"girl","name":"Lily","age":17}
student info: {"gender":"boy","name":"Jack","age":18}

JSONArray 转成 ArrayList

简单总结了 7 种 方法（推荐前 4种），代码如下：

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;import java.util.*;/*** @author Miracle Luna* @version 1.0* @date 2019/7/5 18:36*/
public class JSONArrayToArrayList {public static void main(String[] args) {JSONArray studentJSONArray = new JSONArray();List<Student> studentList = new ArrayList<Student>();Map<String, Object> JohnMap = new HashMap<String, Object>();JohnMap.put("name", "John");JohnMap.put("age", 16);JohnMap.put("gender", "boy");JSONObject John = new JSONObject(JohnMap);Map<String, Object> LilyMap = new HashMap<String, Object>();LilyMap.put("name", "Lily");LilyMap.put("age", 17);LilyMap.put("gender", "girl");JSONObject Lily = new JSONObject(LilyMap);Map<String, Object> JackMap = new HashMap<String, Object>();JackMap.put("name", "Jack");JackMap.put("age", 18);JackMap.put("gender", "boy");JSONObject Jack = new JSONObject(JackMap);studentJSONArray.add(John);studentJSONArray.add(Lily);studentJSONArray.add(Jack);System.out.println("\n=============== studentJSONArray info ================");System.out.println(studentJSONArray);System.out.println("\n=============== JSONArray to ArrayList(方式 1) ================");studentList = studentJSONArray.toJavaList(Student.class);studentList.forEach(student -> System.out.println("stundet info: " + student));System.out.println("\n=============== JSONArray to ArrayList(方式 2) ================");studentList = JSON.parseArray(studentJSONArray.toJSONString(), Student.class);studentList.forEach(student -> System.out.println("stundet info: " + student));System.out.println("\n=============== JSONArray to ArrayList(方式 3) ================");studentList = JSONObject.parseArray(studentJSONArray.toJSONString(), Student.class);studentList.forEach(student -> System.out.println("stundet info: " + student));System.out.println("\n=============== JSONArray to ArrayList(方式 4) ================");studentList = JSONArray.parseArray(studentJSONArray.toJSONString(), Student.class);studentList.forEach(student -> System.out.println("stundet info: " + student));System.out.println("\n=============== JSONArray to ArrayList(方式 5) ================");final ArrayList<Student> tmpList = new ArrayList<Student>();studentJSONArray.forEach(studentJson -> {JSONObject jsonObject = (JSONObject)studentJson;Student student = new Student(jsonObject.getString("name"), jsonObject.getInteger("age"), jsonObject.getString("gender"));tmpList.add(student);});studentList = tmpList;studentList.forEach(student -> System.out.println("stundet info: " + student));System.out.println("\n=============== JSONArray to ArrayList(方式 6) ================");studentList.clear();for (Object object : studentJSONArray) {JSONObject jsonObject = (JSONObject)object;Student student = new Student(jsonObject.getString("name"), jsonObject.getInteger("age"), jsonObject.getString("gender"));studentList.add(student);}studentList.forEach(student -> System.out.println("stundet info: " + student));System.out.println("\n=============== JSONArray to ArrayList(方式 7) ================");studentList.clear();for (int i = 0; i < studentJSONArray.size(); i++) {JSONObject jsonObject = (JSONObject)studentJSONArray.get(i);Student student = new Student(jsonObject.getString("name"), jsonObject.getInteger("age"), jsonObject.getString("gender"));studentList.add(student);}studentList.forEach(student -> System.out.println("stundet info: " + student));}
}

执行结果如下：

=============== studentJSONArray info ================
[{"gender":"boy","name":"John","age":16},{"gender":"girl","name":"Lily","age":17},{"gender":"boy","name":"Jack","age":18}]=============== JSONArray to ArrayList(方式 1) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}=============== JSONArray to ArrayList(方式 2) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}=============== JSONArray to ArrayList(方式 3) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}=============== JSONArray to ArrayList(方式 4) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}=============== JSONArray to ArrayList(方式 5) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}=============== JSONArray to ArrayList(方式 6) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}=============== JSONArray to ArrayList(方式 7) ================
stundet info: Student{name='John', age=16, gender='boy'}
stundet info: Student{name='Lily', age=17, gender='girl'}
stundet info: Student{name='Jack', age=18, gender='boy'}

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Java 语言 ArrayList 和 JSONArray 相互转换

Student 实体类

ArrayList 转成 JSONArray

JSONArray 转成 ArrayList

Java 语言 ArrayList 和 JSONArray 相互转换相关推荐

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