Java对象转json，json转Java对象

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import java.util.HashMap;
import java.util.Map;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;

public class Test {
public static void main(String[] args) {
  Map<String,Object> map = new HashMap<String,Object>();
  map.put("id", 1);
  map.put("name", "test");

  Gson mapGson = new GsonBuilder().create();
  String json = mapGson.toJson(map);

  System.out.println(json);

  ModelTest mt = new ModelTest();
  mt = mapGson.fromJson(json, ModelTest.class);

  System.out.println(mt);

  ModelTest mtest = new ModelTest();
  mtest.setId(2);
  mtest.setName("json");

  String str = mapGson.toJson(mtest);
  System.out.println(str);

}

}

public class ModelTest {
private Integer id;
private String name;
public String getName() {
  return name;
}
public void setName(String name) {
  this.name = name;
}
public Integer getId() {
  return id;
}
public void setId(Integer id) {
  this.id = id;
}
@Override
public String toString() {
  StringBuilder builder = new StringBuilder();
  builder.append("ModelTest [id=").append(id).append(", name=")
    .append(name).append("]");
  return builder.toString();
}

}

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