net.sf.json

骑猪看日落 2023-01-03 01:44 5阅读 0赞

### 文章目录 ###

*  net.sf.json
 *   *  pom依赖
     *  JSONObject
     *  JSONArray
     *  JavaBean和JSON字符串互转
     *  List与JSON字符串互转
     *  Map与JSON字符串互转
     *  JSONArray与List互转
     *  JSONArray与数组互转

# net.sf.json #

在Java中较为常见的Json解析工具有阿里巴巴的fastjson，但由于项目中自带有net.sf.json包。因此使用该包进行Json的构建和解析。

## pom依赖 ##

## JSONObject ##

import net.sf.json.JSONArray;  
    import net.sf.json.JSONObject;  
      
    public class Test {   
        public static void main(String[] args) {   
            // 创建JSONObject 
            JSONObject jsonObject = new JSONObject();  
            jsonObject.put("username", "abc");  
            jsonObject.put("password", "123");  
            // 打印:1 
            System.out.println(jsonObject);  
            //{"username":"abc","password":"123"} 
      
            // 增加属性,打印:2 
            jsonObject.element("sex", "男");  
            System.out.println(jsonObject);
            //{"username":"abc","password":"123","sex":"男"} 
              
            // 根据key返回,打印:3 
            System.out.println(jsonObject.get("sex"));  
            //男
      
            // 判读输出对象的类型 
            boolean isArray = jsonObject.isArray();  
            boolean isEmpty = jsonObject.isEmpty();  
            boolean isNullObject = jsonObject.isNullObject();  
            // 打印:4 
            System.out.println("是否数组:" + isArray + " 是否空:" + isEmpty + " 是否空对象:"  
                    + isNullObject);  
            //是否为数组:false 是否为空:false 是否为空对象:false
              
            
            // 把JSONArray增加到JSONObject中 
            JSONArray jsonArray = new JSONArray();  
            jsonArray.add(0, "111");  
            jsonArray.add(1, "222");  
            // 开始增加 
            jsonObject.element("student", jsonArray);  
            // 打印:5 
            System.out.println(jsonObject);  
            //{"username":"abc","password":"123","sex":"男","student":["111","222"]} 
        }  
    }

## JSONArray ##

import net.sf.json.JSONArray;  
    import net.sf.json.JSONObject;  
      
    public class Test {   
        public static void main(String[] args) {   
            //创建JSONArray 
            JSONArray jsonArray = new JSONArray();  
            jsonArray.add(0, "111");     
            jsonArray.add(1, "222");  
            jsonArray.element("333");  
            //打印:1 
            System.out.println(jsonArray);  
            //["111","222","333"] 
              
            //根据下标返回,打印:2 
            System.out.println(jsonArray.get(0));  
            //111
              
            //根据下标设置新值,打印:3 
            jsonArray.set(0, "it111");  
            System.out.println(jsonArray);  
            //["it111","222","333"] 
              
            //把JSONObject放入到JSONArray中 
            JSONObject jsonObject = new JSONObject();  
            jsonObject.put("username", "lyh");  
            jsonObject.put("password", "123");  
            //开始增加,打印:4 
            jsonArray.add(jsonObject);  
            System.out.println(jsonArray);  
            //["it111","222","333",{"username":"lyh","password":"123"}]
              
            //遍历,打印:5 
            for(int i=0;i<jsonArray.size();i++){   
                System.out.print(jsonArray.get(i)+"\t");  
            }  
            //it111 222 333 {"username":"lyh","password":"123"}
        }  
    }

## JavaBean和JSON字符串互转 ##

public class Test {   
        public static void main(String[] args) {   
            // JavaBean对象转json字符串 
            Student stu1 = new Student("lyh", "111111");  
            JSONObject jsonObject = JSONObject.fromObject(stu1);  
            System.out.println(jsonObject);  
            //{"password":"111111","username":"lyh"} 
      
            // json字符串转JavaBean 
            String jsondata = "{\"password\":\"111111\",\"username\":\"lyh\"}";  
            JSONObject jsonObject1 = JSONObject.fromObject(jsondata);  
            Student stu2 = (Student) JSONObject.toBean(jsonObject1, Student.class);  
            System.out.println(stu2);  
            //用户: lyh 密码:111111 
        }  
    }

## List与JSON字符串互转 ##

public class Test {   
        public static void main(String[] args) {   
            // List转json字符串 
            List list = new ArrayList();  
            list.add(new Student("lyh", "111111"));  
            list.add(new Student("java", "222222"));  
            JSONArray jsonArray = JSONArray.fromObject(list);  
            System.out.println(jsonArray);  
            //[{"password":"111111","username":"lyh"},{"password":"222222","username":"java"}] 
      
            // json字符串转List 
            List list1 = new ArrayList();  
            String jsondata = "[{\"password\":\"111111\",\"username\":\"lyh\"},{\"password\":\"222222\",\"username\":\"java\"}]";  
            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);  
                list1.add(stu2);  
            }  
            System.out.println(list1);  
            //[用户: lyh 密码:111111, 用户: java 密码:222222]
        }  
    }

## Map与JSON字符串互转 ##

public class Test {   
        public static void main(String[] args) {   
            // Map转json字符串 
            Map map = new HashMap();  
            map.put("1", new Student("lyh", "111111"));  
            map.put("2", new Student("java", "222222"));  
            JSONObject jsonMap = JSONObject.fromObject(map);  
            System.out.println(jsonMap);  
            // {"2":{"password":"222222","username":"java"},"1":{"password":"111111","username":"lyh"}} 
      
            // json字符串转Map 
            String jsondata = "{\"2\":{\"password\":\"222222\",\"username\":\"java\"},\"1\":{\"password\":\"111111\",\"username\":\"lyh\"}}";  
            Map map1 = (Map) JSONObject.fromObject(jsondata);  
            Set set = map1.keySet();  
            Iterator ite = set.iterator();  
            while (ite.hasNext()) {   
                String key = (String) ite.next();  
                JSONObject jsonObject = JSONObject.fromObject(map1.get(key));  
                Student stu = (Student) JSONObject  
                        .toBean(jsonObject, Student.class);  
                System.out.println(key + " " + stu);  
                //2 用户: java 密码:222222 
        		//1 用户: lyh 密码:111111
            }  
      
        }  
    }

## JSONArray与List互转 ##

import java.util.ArrayList;  
    import java.util.Iterator;  
    import java.util.List;  
      
    import net.sf.json.JSONArray;  
    import net.sf.json.JsonConfig;  
      
    import com.itlwc.entity.Student;  
      
    public class Test {   
        public static void main(String[] args) {   
            //List转型JSONArray 
            List<Student> list = new ArrayList<Student>();    
            list.add(new Student("lyh", "111111"));  
            list.add(new Student("java", "222222"));   
            JSONArray jsonArray = JSONArray.fromObject(list);  
            System.out.println(jsonArray.toString());  
              
            //JSONArray转型List 
            List<Student> list2 = JSONArray.toList(jsonArray, new Student(), new JsonConfig());  
            Iterator<Student> ite =  list2.iterator();  
            while(ite.hasNext()){   
                Student stu =ite.next();  
                System.out.println(stu);  
            }  
        }  
    }  
    /* 打印结果 [{"password":"111111","username":"lyh"},{"password":"222222","username":"java"}] 用户: lyh 密码:111111 用户: java 密码:222222

## JSONArray与数组互转 ##

import net.sf.json.JSONArray;  
      
    public class Test {   
        public static void main(String[] args) {   
            // Java数组转JSONArray 
            boolean[] boolArray = new boolean[] {  true, false, true };  
            JSONArray jsonArray = JSONArray.fromObject(boolArray);  
            System.out.println(jsonArray.toString());  
      
            // JSONArray转Java数组 
            Object obj[] = jsonArray.toArray();  
            for (Object o : obj) {   
                System.out.print(o + " ");  
            }  
        }  
    }  
    /* 打印结果 : [true,false,true] true false true

net.sf.json

发表评论取消回复

还没有评论，来说两句吧...

相关阅读