Java对象与JSON互相转换jsonlib以及手动创建JSON对象与数组——(二)

　　　　首先声明一下，jsonlib转换与GSON相比太差劲了，操作不是一般的繁琐。GSON可以直接转换成各种集合与对象类型。强烈推荐使用GSON。而且GSON一个方法就可以解决，jsonlib转来转去太繁琐了。

手动创建JSONObject与JSONArray有用，用于读取文件对字符串进行处理

-----------------------------jsonlib操作复杂，转换Map与list<map>更是复杂----------------

Jar包

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" alt="" />

User.java

 package TestJson_JSONlib;

 public class User {

     private String id;
     private String name;
     private Integer age;
     private String address;
     public String getId() {
         return id;
     }
     public int getAge() {
         return age;
     }

     public void setAge(Integer age) {
         this.age = age;
     }
     public String getAddress() {
         return address;
     }
     public void setAddress(String address) {
         this.address = address;
     }
     public void setId(String id) {
         this.id = id;
     }
     public String getName() {
         return name;
     }
     public void setName(String name) {
         this.name = name;
     }
     public User() {
     }
     public User(String id, String name, Integer age, String address) {
         super();
         this.id = id;
         this.name = name;
         this.age = age;
         this.address = address;
     }
     @Override
     public String toString() {
         return "User [id=" + id + ", name=" + name + ", age=" + age + ", address=" + address + "]";
     }

 }

1.Java对象转json(操作复杂)

对象类型用JSONObject，集合类型用JSONArray。

package TestJson_JSONlib;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import javax.xml.bind.UnmarshallerHandler;

import org.junit.Test;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class Bean2JSON {

//    测试单个对象转JSON,转单个对象用JSONObject
    @Test
    public void test1(){
        User user = new User("1", "QIAOZHI",25,"山西太原");
        JSONObject jsonObject =  JSONObject.fromObject(user);
        String json = jsonObject.toString();
        System.out.println(json);
        //{"id":"1","name":"QIAOZHI","age":25,"address":"山西太原"}
    }

//    测试list转JSON，转集合用JSONArray，会产生[]
    @Test
    public void test2(){
        List<User> list = new ArrayList<User>();
        list.add(new User("1", "QIAOZHI",25,"山西太原"));
        list.add(new User("2", "QIAOZHI",25,"山西太原"));
        list.add(new User("3", "QIAOZHI",25,"山西太原"));
        JSONArray jsonArray =  JSONArray.fromObject(list);
        String json = jsonArray.toString();
        System.out.println(json);
//        [{"id":"1","name":"QIAOZHI","age":25,"address":"山西太原"},{"id":"2","name":"QIAOZHI","age":25,"address":"山西太原"},{"id":"3","name":"QIAOZHI","age":25,"address":"山西太原"}]
    }

//    测试map对象转JSON,转单个对象用JSONObject
    @Test
    public void test3(){
        Map<String,User> map = new HashMap<String,User>();
        map.put("1", new User("1", "QIAOZHI",25,"山西太原"));
        map.put("2", new User("2", "QIAOZHI",25,"山西太原"));
        map.put("3", new User("3", "QIAOZHI",25,"山西太原"));
        JSONObject jsonObject=  JSONObject.fromObject(map);
        String json = jsonObject.toString();
        System.out.println(json);
//        {"3":{"address":"山西太原","age":25,"id":"3","name":"QIAOZHI"},"2":{"address":"山西太原","age":25,"id":"2","name":"QIAOZHI"},"1":{"address":"山西太原","age":25,"id":"1","name":"QIAOZHI"}}
    }

//    测试list<map>对象转JSON，转集合用JSONArray，会产生[]
    @Test
    public void test4(){
        List<Map<String,User>> list = new ArrayList<>();
        Map<String,User> map1 = new HashMap<String,User>();
        Map<String,User> map2 = new HashMap<String,User>();
        map1.put("map11", new User("1", "QIAOZHI",25,"山西太原"));
        map1.put("map12", new User("2", "QIAOZHI",25,"山西太原"));
        map2.put("21", new User("11", "QIAOZHI",25,"山西太原"));
        map2.put("22", new User("21", "QIAOZHI",25,"山西太原"));
        list.add(map1);
        list.add(map2);
        JSONArray jsonArray =  JSONArray.fromObject(list);
        String json = jsonArray.toString();
        System.out.println(json);
//        [{"map12":{"id":"2","name":"QIAOZHI","age":25,"address":"山西太原"},"map11":{"id":"1","name":"QIAOZHI","age":25,"address":"山西太原"}},{"21":{"id":"11","name":"QIAOZHI","age":25,"address":"山西太原"},"22":{"id":"21","name":"QIAOZHI","age":25,"address":"山西太原"}}]
    }

}

2.JSON字符串转Java对象与list(只测了转bean与list)

转出来的中间还有空格，使用时候还得去空格。太繁琐了。

在将 Json 形式的字符串转换为 JavaBean 的时候需要注意 JavaBean 中必须有无参构造函数，否则会报找不到初始化方法的错误。

package TestJson_JSONlib;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.junit.Test;

import com.google.gson.Gson;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class JSON2Bean {
//    测试json转单个对象
    @Test
    public void test1(){
        String json = "{\"id\":\"1\",\"name\":\"QIAOZHI\",\"age\":25,\"address\":\"山西太原\"}";
        JSONObject jsonObject = JSONObject.fromObject(json);
        System.out.println(jsonObject);  //产生一个json格式的json对象
//        {"id":"1","name":"QIAOZHI","age":25,"address":"山西太原"}
        User user = (User) JSONObject.toBean(jsonObject, User.class);
        System.out.println(user);
//        User [id=1, name=QIAOZHI, age=null, address=山西太原]
    }

//    测试JSON转list(太反复杂了)
    @SuppressWarnings("unchecked")
    @Test
    public void test2(){
        String json = "[{'id':'1','name':'QIAOZHI','age':25,'address':'山西太原'},{'id':'2','name':'QIAOZHI','age':25,'address':'山西太原'},{'id':'3','name':'QIAOZHI','age':25,'address':'山西太原'}]";
        List<User> list = new ArrayList<User>();
        JSONArray jsonArray = JSONArray.fromObject(json);
        System.out.println(jsonArray);   //产生一个JSON格式的数组
//        [{"id":"1","name":"QIAOZHI","age":25,"address":"山西太原"},{"id":"2","name":"QIAOZHI","age":25,"address":"山西太原"},{"id":"3","name":"QIAOZHI","age":25,"address":"山西太原"}]
        list = (List<User>) JSONArray.toList(jsonArray,User.class);
        System.out.println(list);
//        [User [id=1, name=QIAOZHI, age=null, address=山西太原], User [id=2, name=QIAOZHI, age=null, address=山西太原], User [id=3, name=QIAOZHI, age=null, address=山西太原]]
        System.out.println(list.get(1));
//        User [id=2, name=QIAOZHI, age=null, address=山西太原]
    }
}

3.手动创建JSONObject与JSONArray(用于封装JSON转java对象与List集合)

package TestJson_JSONlib;

import org.junit.Test;

import net.sf.json.JSONArray;
import net.sf.json.JSONObject;

public class CreateJSONObject {

    @Test
    public void test1(){
//        手动创建一个JSONObject
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("id", "11");
        jsonObject.put("name", "qiaozhi");
        jsonObject.put("age", 30);
        jsonObject.put("address", "山西太原");
        System.out.println(jsonObject);
//        {"id":"11","name":"qiaozhi","age":30,"address":"山西太原"}

        JSONObject jsonObject1 = new JSONObject();
        jsonObject1.put("id", "12");
        jsonObject1.put("name", "qiaozhi");
        jsonObject1.put("age", 30);
        jsonObject1.put("address", "山西太原");
        System.out.println(jsonObject1);
//        {"id":"12","name":"qiaozhi","age":30,"address":"山西太原"}

//        产生一个JSONArray
        JSONArray jsonArray = new JSONArray();
        jsonArray.add(jsonObject);
        jsonArray.add(jsonObject1);
        System.out.println(jsonArray);
//        [{"id":"11","name":"qiaozhi","age":30,"address":"山西太原"},{"id":"12","name":"qiaozhi","age":30,"address":"山西太原"}]

//        用上述方法转成Java对象与List集合，用于处理数据
    }
}

可用于手动封装JSON对象。

补充:JSON字符串转map，与map转json字符串的测试:(其实字符转转map是先转为JSONObject再转为map)

        String accessToken = FetchData.getAccessToken();//{"expires_in":7200,"errmsg":"ok","access_token":"94a50870f92230eb8ad8211b4023675c","errcode":0}

        //*******************************json字符串转map
        //转为JSONObject
        JSONObject jsonObject = JSONObject.fromObject(accessToken);
        //转为Map
        Map map = (Map) JSONObject.toBean(jsonObject, Map.class);
        System.out.println(map);

        //******************************Map转JSON字符串
        JSONObject jsonStr = JSONObject.fromObject(map);
        System.out.println(jsonStr.toString());

结果:

{expires_in=7200, errmsg=ok, access_token=94a50870f92230eb8ad8211b4023675c, errcode=0}
{"expires_in":7200,"errmsg":"ok","access_token":"94a50870f92230eb8ad8211b4023675c","errcode":0}

补充:JSONArray其实是List的子类，转换的时候字符串以[]包裹的可以转为JSONArray，而且要转为JSONArray必须以[    ]开始结束

        String jsonStrs = "[{\"customerId\":19,\"customerName\":\"\tXXX有限公司\"},{\"customerId\":5568,\"customerName\":\"\tXXX展有限公司\"}]";
        // 字符串转为JSONArray，必须以[开始，以]结束
        JSONArray jsonArray = JSONArray.fromObject(jsonStrs);
        System.out.println(jsonArray.size());
        System.out.println(jsonArray.toString());
        System.out.println("=================================================");
        for (int i = 0, length_1 = jsonArray.size(); i < length_1; i++) {
            JSONObject jsonObject = jsonArray.getJSONObject(i);
            System.out.println(jsonObject.toString());
        }

        // jsonArray转list
        System.out.println("=================================================");
        List list = JSONArray.toList(jsonArray);
        System.out.println(list);

结果:

2
[{"customerId":19,"customerName":"\tXXX有限公司"},{"customerId":5568,"customerName":"\tXXX展有限公司"}]
=================================================
{"customerId":19,"customerName":"\tXXX有限公司"}
{"customerId":5568,"customerName":"\tXXX展有限公司"}
=================================================
[net.sf.ezmorph.bean.MorphDynaBean@20c8e08f[
{customerName= XXX有限公司, customerId=19}
], net.sf.ezmorph.bean.MorphDynaBean@640edd19[
{customerName= XXX展有限公司, customerId=5568}
]]

查看JSONArray源码:

补充2:其实我们的JSONObject就是Map，我们将字符串转为JSONObject之后数据存入其内置的map中:

        String returnedStr = HttpUtils.doGetWithParams(url, params);//{"errmsg":"ok","department":[{"id":1,"createDeptGroup":true,"name":"开发测试","autoAddUser":true}],"errcode":0}
        // *******************************json字符串转map
        JSONObject jsonObject = JSONObject.fromObject(returnedStr);
        if (jsonObject != null && "ok".equals(jsonObject.get("errmsg"))) {
            return (String) jsonObject.get("department");
        }

        return null;

结果:

[{"id":1,"createDeptGroup":true,"name":"开发测试","autoAddUser":true}]

查看源码:

   public Object get( Object key ) {
      if( key instanceof String ){
         return get( (String) key );
      }
      return null;
   }

   /**
    * Get the value object associated with a key.
    *
    * @param key A key string.
    * @return The object associated with the key.
    * @throws JSONException if this.isNull() returns true.
    */
   public Object get( String key ) {
      verifyIsNull();
      return this.properties.get( key );
   }

　　如果是字符串的话调用字符串调用方法从properties中获取值，properties是什么?应该是个map。。。继续查看源码如下:

   /**
    * The Map where the JSONObject's properties are kept.
    */
   private Map properties;

补充2:如果从JSONObject中获取一个不存在的key的时候会报错，而不是返回null，查看源码发现:

   public String getString( String key ) {
      verifyIsNull();
      Object o = get( key );
      if( o != null ){
         return o.toString();
      }
      throw new JSONException( "JSONObject[" + JSONUtils.quote( key ) + "] not found." );
   }

解决办法:先判断一下

                if(jo.containsKey("tel")){
                    userMap.put("officePhone", jo.getString("tel"));
                }

而对于HashMap来说，key不存在是返回null的，源码如下:

    public V get(Object key) {
        if (key == null)
            return getForNullKey();
        Entry<K,V> entry = getEntry(key);

        return null == entry ? null : entry.getValue();
    }

总结:

　　1.字符串转JSONArray的时候字符串必须是JSON数组，也就是[{},{},.....];字符串转JSONObject必须是对象,也就是{"key":"value"...},当多个{}{}的时候只会转一个，如下。字符串转JSONArray或者JSONObject调用对应的fromObject(Obj)方法:

        String jsonStrs = "[{\"customerId\":19,\"customerName\":\"\tXXX有限公司\"},{\"customerId\":5568,\"customerName\":\"\tXXX展有限公司\"}]";
        String jsonStrs1 = "{\"customerId\":19,\"customerName\":\"\tXXX有限公司\"},{\"customerId\":5568,\"customerName\":\"\tXXX展有限公司\"}";
        JSONArray fromObject = JSONArray.fromObject(jsonStrs);
        JSONObject fromObject1 = JSONObject.fromObject(jsonStrs1);
        System.out.println(fromObject.toString());
        System.out.println(fromObject1.toString());

结果:

[{"customerId":19,"customerName":"\tXXX有限公司"},{"customerId":5568,"customerName":"\tXXX展有限公司"}]
{"customerId":19,"customerName":"\tXXX有限公司"}

　　2.JSONObject是一个中间对象。如果操作集合调用对应的JSONArray即可。

　　　　字符串转对象可以先调用JSONObject.fromObject(str)转换为JSONObject，然后调用JSONObject.toBean(jsonObject,class)转为对应类型的对象

　　　　对象转JSON字符串可以JSONObject.fromObject(str)转换为JSONObject，然后调用其toString()方法即可。

        Map map = new HashMap<>();
        map.put("x", "x");
        map.put("y", "y");
        // Map转JSON字符串(先为JSONObject)
        JSONObject fromObject = JSONObject.fromObject(map);// 转为JSONObject
        String jsonStr = fromObject.toString();
        System.out.println(jsonStr);
        System.out.println("==========================");
        // JSON转Map字符串(先转为JSONObject)
        JSONObject fromObject2 = JSONObject.fromObject(jsonStr);
        Map bean = (Map) JSONObject.toBean(fromObject2, Map.class);
        System.out.println(bean);

结果:

{"y":"y","x":"x"}
==========================
{y=y, x=x}

补充:上面的JSONObject是JSONLib下的类。如果是fastjson包下的JSONObject(alibaba的)使用更简单，字符串转对象与对象转字符串如下:

　　toJSONString(bean)转为JSON串，parseObject(jsonStr,class)转为Bean。

        Map map = new HashMap<>();
        map.put("x", "x");
        map.put("y", "y");
        // bean转JSON字符串
        String jsonString = com.alibaba.fastjson.JSONObject.toJSONString(map);
        System.out.println(jsonString);

        // JSON字符串转bean
        Map parseObject = com.alibaba.fastjson.JSONObject.parseObject(jsonString, Map.class);
        System.out.println(parseObject);

也可以指定指定属性不进行序列化，如下：

        Map<String, String> map = new HashMap<>();
        map.put("x", "x");
        map.put("y", "y");

        // 采用过滤器过滤掉指定属性
        SimplePropertyPreFilter filter = new SimplePropertyPreFilter();
        filter.getExcludes().add("x");
        String jsonString2 = com.alibaba.fastjson.JSONObject.toJSONString(map, filter);
        System.out.println(jsonString2);

结果：

{"y":"y"}