JAVA Oject转List<T>

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/jiangwudidebaba/article/details/81504657

前言： 从网上找Objec转List方法，搜了挺多但是未找到合适的，但是仔细想想这个应该也不难
只要借助Gson就可以将object转list

代码：

package com.mvc.test;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.ArrayList;
import java.util.List;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.mvc.model.User;

public class SerializableTest {


    public static void main(String[] args) {
        SerializableTest test = new SerializableTest();

        test.writeUserToDisk();

        test.readDiskToList();


    }

    public void readDiskToList(){

        try {
            ObjectInputStream in = new ObjectInputStream(new FileInputStream(new File("E:\\download.txt")));

            Object listuser =  in.readObject();

             Gson gson = new Gson();

              List<User> users = gson.fromJson(listuser.toString(), new TypeToken<List<User>>() {
                }.getType());//对于不是类的情况，用这个参数给出
                for (User person : users) {
                    System.out.println(person);
                }    
            System.out.println(users.toString());
        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

    public void writeUserToDisk(){


        List<User> userlist = new ArrayList();

        User user = new User(1,"ooo","ppp",12,45);

        User user1 = new User(2,"oodddo","ppaaap",12,45);

        userlist.add(user);
        userlist.add(user1);

        Gson gson = new Gson();

        try {
            ObjectOutputStream out = new ObjectOutputStream(new FileOutputStream(new File("E:\\download.txt")));

            out.writeObject(gson.toJson(userlist));

            out.close();

        } catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


    }

}