我要评论目前使用的（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());
}
}
}
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