JavaBean与xml文件的互转——xstream

痛定思痛。 2022-05-11 02:18 199阅读 0赞

**目录**

一.所需jar包

二.JavaBean对象与xml互转之准备相关实体类

三.JavaBean对象转成xml

四.xml文件转JavaBean对象

--------------------

# 一.所需jar包 #

*  1.1.xstream.jar——互转的基础jar包
 *  1.2.xmlpull.jar——JavaBean转成xml文件需要的jar包
 *  1.3.xpp3-1.1.4c.jar——xml转成JavaBean对象所需要的jar包

这些jar包晚上都可以找到，如果实在找不到，这里给大家一个传送门:[xstream.jar包及其他所需依赖jar包下载传送门][xstream.jar_jar]

# 二.JavaBean对象与xml互转之准备相关实体类 #

package bean;
    
    import java.util.List;
    
    /**
     * This is the Customer class
     *
     * @author: lvxiaobu
     * @createDate: 2018-09-18 14:45
     */
    public class Customer {
    
        private String commodity;
    
    
        public String getCommodity() {
            return commodity;
        }
    
        public void setCommodity(String commodity) {
            this.commodity = commodity;
        }
    }

package bean;
    
    import java.util.List;
    
    /**
     * This is the User class
     *
     * @author: lvxiaobu
     * @createDate: 2018-09-18 14:44
     */
    public class User {
    
        private String name;
        private String age;
        private List<Customer> customer;
    
        public String getName() {
            return name;
        }
    
        public void setName(String name) {
            this.name = name;
        }
    
        public String getAge() {
            return age;
        }
    
        public void setAge(String age) {
            this.age = age;
        }
    
        public List<Customer> getCustomer() {
            return customer;
        }
    
        public void setCustomer(List<Customer> customer) {
            this.customer = customer;
        }
    }

# 三.JavaBean对象转成xml #

public static void main(String[] args) {
            User user = new User();
            Customer customer1 = new Customer();
            Customer customer2 = new Customer();
            customer1.setCommodity("手表");
            customer2.setCommodity("电脑");
    
            List<Customer> list = new ArrayList<Customer>();
            list.add(customer1);
            list.add(customer2);
            user.setName("吕小布");
            user.setAge("23");
            user.setCustomer(list);
    
            //创建xStream对象
            XStream xStream = new XStream();
    
            //给class起别名(建议先注释掉,看一下不起别名输出的xml格式)
            xStream.alias("User",User.class);
            xStream.alias("Customer",Customer.class);
    
            //调用toXML 将对象转成字符串
            String s = xStream.toXML(user);
            System.out.println(s);
    
    
            //将字符串写入文件
            //handIo(s);
    
    
        }

控制台输出显示:

# 四.xml文件转JavaBean对象 #

public static void main(String[] args) {
    
            //模拟一个xml格式字符串
            String xml = "<user>\n" +
                    "  <name>beyondLi</name>\n" +
                    "  <age>23</age>\n" +
                    "  <customer>\n" +
                    "    <Customer>\n" +
                    "      <commodity>商品1</commodity>\n" +
                    "    </Customer>\n" +
                    "    <Customer>\n" +
                    "      <commodity>商品2</commodity>\n" +
                    "    </Customer>\n" +
                    "  </customer>\n" +
                    "</user>";        
    
            XStream xstream = new XStream();
    
            //不设置会报错
            XStream.setupDefaultSecurity(xstream);
            xstream.allowTypes(new Class[]{User.class, Customer.class});
    
            //将别名与xml名字相对应
            xstream.alias("User", User.class);
            xstream.alias("Customer", Customer.class);
    
    
            User user2 = (User) xstream.fromXML(xml.toString());
            System.out.println(user2);
    
    
        }

控制台输出:

bean.User@4d3167f4

正常流程中，应该是给将JavaBean对象转成xml文件，或者是读取指定xml文件然后将其内容转成JavaBean对象。这个时候就需要添加IO流来操作文件了。

IO流的资源网络上一大堆，在这里我放一个我自己整理的IO流的案例<该IO流案例和此篇博客其实一个demo中的例子>，

传送门:[IO流写出读取文件][IO]

如果有书写错误的地方，或者是有问题的地方请及时评论或者是私信我，以免误导个别萌新。
    虽然我也是个萌新。
    你好，我叫吕小布。

[xstream.jar_jar]: https://download.csdn.net/my
[IO]: https://blog.csdn.net/qq_36769100/article/details/82760013