目錄

一.所需jar包

• 1.1.xstream.jar——互轉的基礎jar包
• 1.2.xmlpull.jar——JavaBean轉成xml檔案需要的jar包
• 1.3.xpp3-1.1.4c.jar——xml轉成JavaBean物件所需要的jar包

二.JavaBean物件與xml互轉之準備相關實體類

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物件轉成xml

    public static void main(String[] args) {
        User user = new User();
        Customer customer1 = new Customer();
        Customer customer2 = new Customer();
        customer1.setCommodity("手錶");
        customer2.setCommodity("電腦");

        List<Customer> list = new ArrayList<Customer>();
        list.add(customer1);
        list.add(customer2);
        user.setName("呂小布");
        user.setAge("23");
        user.setCustomer(list);

        //建立xStream物件
        XStream xStream = new XStream();

        //給class起別名(建議先註釋掉,看一下不起別名輸出的xml格式)
        xStream.alias("User",User.class);
        xStream.alias("Customer",Customer.class);

        //呼叫toXML 將物件轉成字串
        String s = xStream.toXML(user);
        System.out.println(s);


        //將字串寫入檔案
        //handIo(s);


    }
 

控制檯輸出顯示:

<User>
  <name>呂小布</name>
  <age>23</age>
  <customer>
    <Customer>
      <commodity>手錶</commodity>
    </Customer>
    <Customer>
      <commodity>電腦</commodity>
    </Customer>
  </customer>
</User>

四.xml檔案轉JavaBean物件

    public static void main(String[] args) {

        //模擬一個xml格式字串
        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();

        //不設定會報錯
        XStream.setupDefaultSecurity(xstream);
        xstream.allowTypes(new Class[]{User.class, Customer.class});

        //將別名與xml名字相對應
        xstream.alias("User", User.class);
        xstream.alias("Customer", Customer.class);


        User user2 = (User) xstream.fromXML(xml.toString());
        System.out.println(user2);


    }

控制檯輸出:

[email protected]

正常流程中，應該是給將JavaBean物件轉成xml檔案，或者是讀取指定xml檔案然後將其內容轉成JavaBean物件。這個時候就需要新增IO流來操作檔案了。

IO流的資源網路上一大堆，在這裡我放一個我自己整理的IO流的案例<該IO流案例和此篇部落格其實一個demo中的例子>，

如果有書寫錯誤的地方，或者是有問題的地方請及時評論或者是私信我，以免誤導個別萌新。
雖然我也是個萌新。
你好，我叫呂小布。