Json和Map互转，三个包（org.json/net.sf.json/com.google.gson）

目前使用的（org.json/net.sf.json/com.google.gson）这三种json-map互转，其他包的以后在补充。。。。。。。。。。。。。。

导入的jar有：

commons-beanutils-1.6.1.jar

commons-lang-2.1.jar

ezmorph-1.0.3.jar

jackson-all-1.8.5.jar

gson-2.2.4.jar

json-lib-2.2.2-jdk15.jar

json.jar

 

/**
 * 
 */
package map2json;

import java.util.hashmap;
import java.util.iterator;
import java.util.linkedhashmap;
import java.util.map;
import java.util.map.entry;

import net.sf.json.jsonarray;

import com.google.gson.gson;


/**
 * @author hy
 * @date 2019-02-25 15:45:35
 *
 */
public class map2json {
        
    public static void main(string[] args) {
        //map2jsonstr1();
        //map2jsonstr2();
        map2jsonstr3();
    }
    
//net.sf.json包
public static void map2jsonstr1() {
    map<string, object> map =new linkedhashmap<string, object>();
    map.put("1", "a");
    map.put("2", "b");
    map.put("3", "c");
    map.put("4", "d");
    map.put("5", "e");
    map.put("6", new string[]{"aa","bb"});
    //多个不同包的同名类，需要指明指哪个包里的
    net.sf.json.jsonobject jo = net.sf.json.jsonobject.fromobject(map);
    system.out.println(jo.tostring());
    //数组
    jsonarray json =jsonarray.fromobject(map);
    system.out.println(json.tostring());
    //将json数据再转回map
    net.sf.json.jsonobject  myjson = net.sf.json.jsonobject.fromobject(map);
    @suppresswarnings("unchecked")
    map<object,object> m = myjson; 
    for (entry<object, object > entry  : m.entryset()) {
    system.out.println(entry.getkey().tostring()+":"+entry.getvalue().tostring());
    }
}
//    org.json包
public static void map2jsonstr2() {
    map<string, string> map =new linkedhashmap<string, string>();
    map.put("1", "a");
    map.put("2", "b");
    map.put("3", "c");
    map.put("4", "d");
    map.put("5", "e");
    //org.json
    org.json.jsonobject js =new org.json.jsonobject(map);
    system.out.println(js.tostring());
    map<object, object> ma = new hashmap<>();
    @suppresswarnings("rawtypes")
    iterator it = js.keys();
    while(it.hasnext()){
        string key = (string) it.next();
        //得到value的值
        object value = js.get(key);
       // system.out.println(key+":"+valstr);
        ma.put(key,value.tostring());
        
        }
    for (entry<object, object> mp : ma.entryset()) {
        system.out.println(mp.getkey()+":"+mp.getvalue());
    }
}

    
    
@suppresswarnings("unchecked")
//com.google.gson
public static void map2jsonstr3() {
    
    map<string, string> map =new linkedhashmap<string, string>();
    map.put("1", "a");
    map.put("2", "b");
    map.put("3", "c");
    map.put("4", "d");
    map.put("5", "e");
    
     gson gson = new gson();
     string jsonstr = gson.tojson(map);
     system.out.println(jsonstr);
     
     map<object, object> ma =new hashmap<>();
     ma = gson.fromjson(jsonstr, map.class);
     
     for (entry<object, object> mp : ma.entryset()) {
            system.out.println(mp.getkey()+":"+mp.getvalue());
        }
     
    }
    
}