public static void main(String[] args) {Map map=new HashMap();map.put("我","妹");map.put("擦","哇");map.put("你","呀");JSONObject json = JSONObject.fromObject(map);System.out.println(json);}輸出的結果 {
    "我":"妹","擦":"哇","你":"呀"} toBean();首先一个javabean对象public class Student {private int id ;private String name;private int age;public int getId() {return id;}public void setId(int id) {this.id = id;}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 String toString(){return this.id + ", " + this.name + ", " + this.age;}}然后测试toBean方法的类import net.sf.json.JSONObject;public class ToBeanTest {public static void main(String[] args) {String json = "{id:'1001',name:'张三',age:'22'}";Student stu = new Student();JSONObject obj = JSONObject.fromObject(json);stu = (Student)JSONObject.toBean(obj, Student.class);System.out.println(stu);}}输出结果为1001, 张三, 22 然后我们在修改修改import net.sf.json.JSONObject;public class ToBeanTest {public static void main(String[] args) {String json = "{id:'1001',name:'张三'}";Student stu = new Student();JSONObject obj = JSONObject.fromObject(json);stu = (Student)JSONObject.toBean(obj, Student.class);System.out.println(stu);}}把年龄给去掉age为int型，输出结果为：1001, 张三, 0 然后再做小小改动import net.sf.json.JSONObject;public class ToBeanTest {public static void main(String[] args) {String json = "{id:'1001',age:'22'}"; Student stu = new Student();JSONObject obj = JSONObject.fromObject(json);stu = (Student)JSONObject.toBean(obj, Student.class);System.out.println(stu);}}把姓名给去掉name为String型，输出结果为：1001, null, 22 再改动一下：import net.sf.json.JSONObject;public class ToBeanTest {public static void main(String[] args) {String json = "{id:'1001',name:'张三',age:'nn'}";Student stu = new Student();JSONObject obj = JSONObject.fromObject(json);stu = (Student)JSONObject.toBean(obj, Student.class);System.out.println(stu);}}把age改成非整形，输出结果为：1001, 张三, 0 再改动一下：import net.sf.json.JSONObject;public class ToBeanTest {public static void main(String[] args) {String json = "{id:'1001',name:'张三',age:'22',sex:'男'}";Student stu = new Student();JSONObject obj = JSONObject.fromObject(json);stu = (Student)JSONObject.toBean(obj, Student.class);System.out.println(stu);}}加了一个sex:'男'的一对键值，输出结果为：1001, 张三, 22