我要评论 1 import java.io.file;
2 import java.io.fileinputstream;
3 import java.io.filenotfoundexception;
4 import java.io.ioexception;
5 import java.io.inputstream;
6
7 import javax.xml.parsers.documentbuilder;
8 import javax.xml.parsers.documentbuilderfactory;
9 import javax.xml.parsers.parserconfigurationexception;
10
11 import org.w3c.dom.document;
12 import org.w3c.dom.element;
13 import org.w3c.dom.nodelist;
14 import org.xml.sax.saxexception;
15
16 public abstract class xmlreader {
17 // 只需要一份 documentbuilder
18 private static documentbuilder documentbuilder;
19
20 static {
21 try {
22 documentbuilder = documentbuilderfactory
23 .newinstance()
24 .newdocumentbuilder();
25 } catch (parserconfigurationexception e) {
26 e.printstacktrace();
27 }
28 }
29
30 public xmlreader() {
31 }
32
33 // 获取document，document是w3c的，不要导错了
34 public static document opendocument(inputstream is) {
35 document document = null;
36 try {
37 document = documentbuilder.parse(is);
38 } catch (saxexception | ioexception e) {
39 e.printstacktrace();
40 } finally {
41 try {
42 is.close();
43 } catch (ioexception e) {
44 e.printstacktrace();
45 }
46 }
47
48 return document;
49 }
50
51 public static document opendocument(string xmlpath) {
52 inputstream is = xmlreader.class.getresourceasstream(xmlpath);
53 if (is == null) {
54 try {
55 // 自定义异常
56 throw new xmlfilenotexistexception("文件[" + xmlpath+ "]不存在!");
57 } catch (xmlfilenotexistexception e) {
58 e.printstacktrace();
59 }
60 }
61
62 return opendocument(is);
63 }
64
65 public static document opendocument(file path) {
66 inputstream is = null;
67 try {
68 is = new fileinputstream(path);
69 } catch (filenotfoundexception e) {
70 e.printstacktrace();
71 }
72 return opendocument(is);
73 }
74
75 // 抽象方法，由用户自行处理得到的标签
76 public abstract void dealelment(element element, int index);
77
78 // 抽象方法在for循环中，每次读取到一个标签，就交给抽象方法，由用户自行使用
79 public xmlreader parse(element element, string tagname) {
80 nodelist nodelist = element.getelementsbytagname(tagname);
81
82 for (int index = 0; index < nodelist.getlength(); index++) {
83 element ele = (element) nodelist.item(index);
84
85 dealelment(ele, index);
86 }
87
88 return this;
89 }
90
91 public xmlreader parse(document document, string tagname) {
92 nodelist nodelist = document.getelementsbytagname(tagname);
93
94 for (int index = 0; index < nodelist.getlength(); index++) {
95 element element = (element) nodelist.item(index);
96
97 dealelment(element, index);
98 }
99
100 return this;
101 }
102
103 }
这是我们的xml文件，对其进行解析
1 <?xml version="1.0" encoding="utf-8"?> 2 <test> 3 <class name = "第一个标签" type = "firstlable"> 4 <parameter id = "one" value = "一"></parameter> 5 <parameter id = "two" value = "二"></parameter> 6 <parameter id = "thr" value = "三"></parameter> 7 </class> 8 <class name = "第二个标签" type = "secondlable"> 9 <parameter id = "four" value = "四"></parameter> 10 <parameter id = "six" value = "五"></parameter> 11 </class> 12 </test>
public static void main(string[] args) {
new xmlreader() {
@override
public void dealelment(element element, int index) {
string name = element.getattribute("name");
string type = element.getattribute("type");
system.out.println("name=" + name + " type=" + type);
new xmlreader() {
@override
public void dealelment(element element, int index) {
string id = element.getattribute("id");
string value = element.getattribute("value");
system.out.println("\tid=" + id + " value=" + value);
}
}.parse(element, "parameter");
}
}.parse(xmlreader.opendocument("/test.xml"), "class");
}
结果如下
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