全部代码：
import net.sf.json.JSONArray;
import net.sf.json.JSONObject;
public class Json {
public static void main(String[] args) {
//创建JSONArray
JSONArray jsonArray = new JSONArray();
//添加
jsonArray.add(0, "张三");
jsonArray.add(1, "123");
jsonArray.element("男");
System.out.println(jsonArray);
//根据下标返回输出
System.out.println(jsonArray.get(0));
//根据下标设置新值，修改
jsonArray.set(0, "李四");
System.out.println(jsonArray);
//把JSONObject放入到JSONArray中
JSONObject jsonObject = new JSONObject();
jsonObject.put("username", "张三");
jsonObject.put("password", "123");
jsonArray.add(jsonObject);
System.out.println(jsonArray);
//循环输出
for(int i = 0; i < jsonArray.size(); i++) {
System.out.println(jsonArray.get(i));
}
}
}
运行结果
JavaBean与json字符串互转
student类：
public class Student {
private String username;
private String password;
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public Student(String username, String password) {
super();
this.username = username;
this.password = password;
}
public Student() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "Student [username=" + username + ", password=" + password + "]";
}
}
定义对象，JavaBean对象转json字符串
//定义对象
Student stu = new Student("张三", "123456");
//JavaBean对象转json字符串
JSONObject jsonObject = JSONObject.fromObject(stu);
System.out.println(jsonObject);
json字符串转为javaBean
//json字符串转为javaBean
//定义json字符串
String jsondata = "{\"username\":\"李四\", \"password\":\"123\"}";
//转为json对象
JSONObject json = JSONObject.fromObject(jsondata);
//转为JavaBean对象
Student stu2 = (Student)JSONObject.toBean(json, Student.class);
System.out.println(stu2.toString());
全部代码：
import net.sf.json.JSONObject;
public class Json {
public static void main(String[] args) {
//定义对象
Student stu = new Student("张三", "123456");
//JavaBean对象转json字符串
JSONObject jsonObject = JSONObject.fromObject(stu);
System.out.println(jsonObject);
//json字符串转为javaBean
//定义json字符串
String jsondata = "{\"username\":\"李四\", \"password\":\"123\"}";
//转为json对象
JSONObject json = JSONObject.fromObject(jsondata);
//转为JavaBean对象
Student stu2 = (Student)JSONObject.toBean(json, Student.class);
System.out.println(stu2.toString());
}
}
List与json字符串互转
先定义list集合，list转json字符串
//定义list集合
List list = new ArrayList();
list.add(new Student("张三", "123"));
list.add(new Student("李四", "456"));
//list转json字符串
JSONArray jsonArray = JSONArray.fromObject(list);
System.out.println(jsonArray);
json字符串转list
//json字符串转list
List list2 = new ArrayList();
String jsondata = "[{\"password\":\"123\",\"username\":\"张三\"},{\"password\":\"456\",\"username\":\"李四\"}]";
JSONArray jsonArray1 = JSONArray.fromObject(jsondata);
for(int i = 0; i < jsonArray1.size(); i++) {
JSONObject jsonObject2 = jsonArray1.getJSONObject(i);
Student stu2 = (Student)JSONObject.toBean(jsonObject2, Student.class);
list2.add(stu2);
}
System.out.println(list2);
Map与json字符串互转
定义map集合，Map转json字符串
//定义map集合
Map map = new HashMap();
map.put("1", new Student("张三", "123"));
map.put("2", new Student("李四", "456"));
//Map转json字符串
JSONObject jsonMap = JSONObject.fromObject(map);
System.out.println(jsonMap);
定义字符串map集合，map集合字符串转为map
//定义字符串map集合
String jsondata = "{\"1\":{\"password\":\"123\",\"username\":\"张三\"},\"2\":{\"password\":\"456\",\"username\":\"李四\"}}";
//map集合字符串转为map
Map map2 = (Map)JSONObject.fromObject(jsondata);
Set set = map2.keySet();
//定义迭代器，迭代输出
Iterator ite = set.iterator();
while(ite.hasNext()) {
//取出一个字符串对象
String key = (String)ite.next();
//转为json格式
JSONObject jsonObject = JSONObject.fromObject(map2.get(key));
//转为对象
Student stu = (Student)JSONObject.toBean(jsonObject, Student.class);
System.out.println(key+" "+stu);
}
JSONArray与List互转
定义list集合，List转型JSONArray
//定义list集合
List
list.add(new Student("张三", "123"));
list.add(new Student("李四", "456"));
//List转型JSONArray
JSONArray jsonArray = JSONArray.fromObject(list);
System.out.println(jsonArray.toString());
JSONArray转型List，JSONArray是用的上面的那个jsonArray变量
//JSONArray转型List
List
Iterator
while(ite.hasNext()) {
Student stu = ite.next();
System.out.println(stu);
}
JSONArray与数组互转
定义数组，数组转JSONArray
//定义数组
boolean[] boolArray = {true, false, true};
//java数组转JSONArray
JSONArray jsonArray = JSONArray.fromObject(boolArray);
System.out.println(jsonArray.toString());
JSONArray转java数组
//JSONArray转java数组
Object obj[] = jsonArray.toArray();
for(Object o : obj) {
System.out.print(o+"\t");
}
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