项目分析_xxoo-master

项目介绍:使用java1.5的原生xml操作类实现 对象<-->xml字符串的相互转化

项目分析:主要分为是三个部分
1、容器类:AbstractContainer  
      存储xml、object对象的数组集合,管理xml/object的添加、删除、获取等,添加xml/object的同时会自动相互转化成其它对象并存储到数组中

2、DomConfigurableXmlParser-->doParseXml:xlm字符串转换成object对象

a) 使用javax.xm.parsers、org.w3c.dom原生库将xml字符串转化成Element对象

1
2
3
4
DocumentBuilder dombuilder = domfac.newDocumentBuilder();
        ByteArrayInputStream inputStream = new ByteArrayInputStream(xml.getBytes());
        Document doc = dombuilder.parse(inputStream);
        Element root = doc.getDocumentElement();

b) 通过循环Element对象+反射转换成object对象

3、AbstractXmlBuilder-->buildXml:object对象转化成xml字符串

方法是通过object每个属性的值拼接成xml字符串

项目特点

1、不使用任何第三方库实现xml和object对象的相互转换

2、可以处理普通类型、日期类型(可通过注解设定格式)、集合(如ArrayList、HashSet)

3、部分代码解析:

a) Date.class.isAssignableFrom(field.getType()

判断field.getType()会否是Date的子类型(isAssignableFrom关系:父-->子)

b) A instanceof  B:判断A是否是B的实

c)复杂类型的处理(复杂类型并且是iterable类型)

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
else if (Reflects.isComplexType(field.getType()) && Iterable.class.isAssignableFrom(field.getType())) {
              //属性为复杂类型,且是可迭代的(如数组、list、set类型等)
              Class<?> iterableGenericType = Reflects.getArrayGenericType(field);
              Iterable iterable = null;
              if (List.class.isAssignableFrom(field.getType())) {
                  iterable = new ArrayList();
              }
              if (Set.class.isAssignableFrom(field.getType())) {
                  iterable = new HashSet();
              }
              NodeList iterableNodeList = node.getChildNodes();
              for (int j = 0 ; j < iterableNodeList.getLength() ; j++) {
                  Node iterableNode = iterableNodeList.item(j);
                  if (iterableNode.getNodeType() != Node.ELEMENT_NODE) {
                      continue;
                  }
                  //iterable为ArrayList或则HashSet
                  if (List.class.isAssignableFrom(field.getType())) {
                      ((List)iterable).add(parseRecursion(iterableGenericType, iterableNode));
                  }
                  if (Set.class.isAssignableFrom(field.getType())) {
                      ((Set)iterable).add(parseRecursion(iterableGenericType, iterableNode));
                  }
              }
              field.set(object, iterable);

Reflects.java

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
public class Reflects {
     
    private Reflects(){}
     
    /**
     * 判断是否复杂类型,版本1.0.0不支持java.lang java.util java.sql包中的实体类
     * @param clazz
     * @return boolean
     */
    public static boolean isComplexType(Class<?> clazz){
        if ((clazz.getName().startsWith("java.lang.") || clazz.getName().startsWith("java.util.")
                || clazz.getName().startsWith("java.sql.")) && !clazz.isArray() && !Iterable.class.isAssignableFrom(clazz) ) {
            return false;
        }
        return true;
    }
     
    /**
     * 是否含有属性
     * @param clazz
     * @return boolean
     */
    public static boolean hasField(Class<?> clazz){
        if (clazz.getDeclaredFields() == null || clazz.getDeclaredFields().length == 0) {
            return false;
        }
        return true;
    }
     
    /**
     * 返回一个默认构造器产生的实例
     * @param clazz
     * @return object
     * @throws InstantiationException
     * @throws IllegalAccessException
     */
    public static <T> T getInstance(Class<T> clazz) throws InstantiationException, IllegalAccessException{
        return clazz.newInstance();
    }
     
    /**
     * 获取数组属性中所持有的类型
     * @param field
     * @return class
     */
    public static <T> Class<T> getArrayGenericType(Field field){
        Type type = field.getGenericType();
        if (type instanceof ParameterizedType) {
            ParameterizedType parameterizedType = (ParameterizedType) type;
            return (Class<T>) parameterizedType.getActualTypeArguments()[0];
        }
        return null;
    }
     
}

 





附件列表

原文地址:https://www.cnblogs.com/gossip/p/6076462.html