java读取XML

xml源文件如下：

Java代码

1. <?xmlversion="1.0"encoding="UTF-8"?>
2. <memcachesversion="1">
3. <memcachetype="AAAA">
4. <ip>11.11.1.244:11211</ip>
5. <prefix>aaaa_</prefix>
6. </memcache>
7. <memcachetype="BBBB">
8. <ip>11.22.1.243:11211</ip>
9. <prefix>bbbb_</prefix>
10. </memcache>
11. <memcachetype="CCCC">
12. <ip>11.33.33.152:11211</ip>
13. <prefix>cccc_</prefix>
14. </memcache>
15. <memcachetype="DDDD">
16. <ip>11.44.15.244:11211</ip>
17. <prefix>dddd_</prefix>
18. </memcache>
19. <memcachetype="EEEEEEE">
20. <ip>11.66.16.152:11211</ip>
21. <prefix>eeeee_</prefix>
22. </memcache>
23. <memcachetype="FFFFF">
24. <ip>11.77.170.152:11211</ip>
25. <prefix>fffff_</prefix>
26. </memcache>
27. </memcaches>

<?xml version="1.0" encoding="UTF-8"?> <memcaches version="1"> <memcache type="AAAA"> <ip>11.11.1.244:11211</ip> <prefix>aaaa_</prefix> </memcache> <memcache type="BBBB"> <ip>11.22.1.243:11211</ip> <prefix>bbbb_</prefix> </memcache> <memcache type="CCCC"> <ip>11.33.33.152:11211</ip> <prefix>cccc_</prefix> </memcache> <memcache type="DDDD"> <ip>11.44.15.244:11211</ip> <prefix>dddd_</prefix> </memcache> <memcache type="EEEEEEE"> <ip>11.66.16.152:11211</ip> <prefix>eeeee_</prefix> </memcache> <memcache type="FFFFF"> <ip>11.77.170.152:11211</ip> <prefix>fffff_</prefix> </memcache> </memcaches>

解析上面xml文件的java代码：

Java代码

2. importjavax.xml.parsers.DocumentBuilder;
3. importjavax.xml.parsers.DocumentBuilderFactory;
4. importjava.io.*;//Java基础包，包含各种IO操作
5. importjava.util.*;//Java基础包，包含各种标准数据结构操作
6. importjavax.xml.parsers.*;//XML解析器接口
7. importorg.w3c.dom.*;
9. importcom.happyelements.apollo.config.type.AppType;
10. importcom.happyelements.apollo.util.ApolloCollectionsUtil;
12. publicclassParseMemXML{
14. publicstaticfinalMap<String,MemBean>memMap=ApolloCollectionsUtil.newMap();//将MemBean放到map中存放
16. //解析xml文件并将得到的实例放入map中
17. publicstaticvoidinitXMLFile(Stringfilename)throwsException{
18. //为解析xml做准备
19. //创建DocumentBuilderFactory实例,指定DocumentBuilder
20. DocumentBuilderFactorydbf=DocumentBuilderFactory.newInstance();
21. DocumentBuilderdb=null;
22. try{
23. db=dbf.newDocumentBuilder();
24. }catch(ParserConfigurationExceptionpce){
25. System.out.println(pce);
26. //出异常时输出异常信息，然后退出，下同
27. System.exit(1);
28. }
29. Documentdoc=null;
30. try{
31. doc=db.parse(filename);
32. }catch(DOMExceptiondom){
33. System.err.println(dom.getMessage());
34. System.exit(1);
35. }catch(IOExceptionioe){
36. System.err.println(ioe);
37. System.exit(1);
38. }
40. //下面是解析XML的全过程，
41. //比较简单，先取根元素"memcaches"
42. Elementroot=doc.getDocumentElement();
43. //取"memcache"元素列表
44. NodeListmemcaches=root.getElementsByTagName_r("memcache");
45. for(inti=0;i<memcaches.getLength();i++){
46. //创建一个memcache的Bean实例
47. MemBeanmemBean=newMemBean();
48. //依次取每个"memcache"元素
49. Elementmemcache=(Element)memcaches.item(i);
50. //取memcache的type属性
51. memBean.setType(memcache.getAttribute("type"));
52. //取"ip"元素，下面类同
53. NodeListips=memcache.getElementsByTagName_r("ip");
54. if(ips.getLength()==1){
55. Elemente=(Element)ips.item(0);
56. Textt=(Text)e.getFirstChild();
57. memBean.setIp(t.getNodeValue());
58. System.out.println(memBean.getIp());
59. }
60. NodeListprefixs=memcache.getElementsByTagName_r("prefix");
61. if(prefixs.getLength()==1){
62. Elemente=(Element)prefixs.item(0);
63. Textt=(Text)e.getFirstChild();
64. memBean.setPrefix(t.getNodeValue());
65. System.out.println(memBean.getPrefix());
66. }
67. memMap.put(memBean.getType().toString(),memBean);
68. }
69. }
71. publicstaticvoidmain(String[]args)throwsException{
72. ParseMemXML.initXMLFile("E:\\workplace\\Tool2\\WebRoot\\WEB-INF\\memconf.xml");
73. System.out.println(ParseMemXML.memMap.size());
74. MemBeanmemBean=ParseMemXML.memMap.get(AppType.AAAA.toString());
75. System.out.println("ip====="+memBean.getIp());
76. System.out.println("prefix==="+memBean.getPrefix());
78. }
79. }

import javax.xml.parsers.DocumentBuilder; import javax.xml.parsers.DocumentBuilderFactory; import java.io.*; //Java基础包，包含各种IO操作 import java.util.*; //Java基础包，包含各种标准数据结构操作 import javax.xml.parsers.*; //XML解析器接口 import org.w3c.dom.*; import com.happyelements.apollo.config.type.AppType; import com.happyelements.apollo.util.ApolloCollectionsUtil; public class ParseMemXML { public static final Map<String, MemBean> memMap = ApolloCollectionsUtil.newMap();//将MemBean放到map中存放 //解析xml文件并将得到的实例放入map中 public static void initXMLFile(String filename) throws Exception { // 为解析xml做准备 // 创建DocumentBuilderFactory实例,指定DocumentBuilder DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance(); DocumentBuilder db = null; try { db = dbf.newDocumentBuilder(); } catch (ParserConfigurationException pce) { System.out.println(pce); // 出异常时输出异常信息，然后退出，下同 System.exit(1); } Document doc = null; try { doc = db.parse(filename); } catch (DOMException dom) { System.err.println(dom.getMessage()); System.exit(1); } catch (IOException ioe) { System.err.println(ioe); System.exit(1); } // 下面是解析XML的全过程， // 比较简单，先取根元素"memcaches" Element root = doc.getDocumentElement(); // 取"memcache"元素列表 NodeList memcaches = root.getElementsByTagName_r("memcache"); for (int i = 0; i < memcaches.getLength(); i++) { // 创建一个memcache的Bean实例 MemBean memBean = new MemBean(); // 依次取每个"memcache"元素 Element memcache = (Element) memcaches.item(i); // 取memcache的type属性 memBean.setType(memcache.getAttribute("type")); // 取"ip"元素，下面类同 NodeList ips = memcache.getElementsByTagName_r("ip"); if (ips.getLength() == 1) { Element e = (Element) ips.item(0); Text t = (Text) e.getFirstChild(); memBean.setIp(t.getNodeValue()); System.out.println(memBean.getIp()); } NodeList prefixs = memcache.getElementsByTagName_r("prefix"); if (prefixs.getLength() == 1) { Element e = (Element) prefixs.item(0); Text t = (Text) e.getFirstChild(); memBean.setPrefix(t.getNodeValue()); System.out.println(memBean.getPrefix()); } memMap.put(memBean.getType().toString(), memBean); } } public static void main(String[] args) throws Exception { ParseMemXML.initXMLFile("E:\\workplace\\Tool2\\WebRoot\\WEB-INF\\memconf.xml"); System.out.println(ParseMemXML.memMap.size()); MemBean memBean = ParseMemXML.memMap.get(AppType.AAAA.toString()); System.out.println("ip=====" + memBean.getIp()); System.out.println("prefix===" + memBean.getPrefix()); } }

MemBean的java源文件

Java代码

1. importjava.io.Serializable;
3. importorg.simpleframework.xml.Attribute;
4. importorg.simpleframework.xml.Element;
5. importorg.simpleframework.xml.Root;
7. @Root(name="memconf")
8. publicclassMemBeanimplementsSerializable{
10. privatestaticfinallongserialVersionUID=2209681159359089305L;
12. @Attribute
13. privateStringtype;
14. @Element
15. privateStringip;
16. @Element
17. privateStringprefix;
19. publicStringgetType(){
20. returntype;
21. }
23. publicvoidsetType(Stringtype){
24. this.type=type;
25. }
27. publicStringgetIp(){
28. returnip;
29. }
31. publicvoidsetIp(Stringip){
32. this.ip=ip;
33. }
35. publicStringgetPrefix(){
36. returnprefix;
37. }
39. publicvoidsetPrefix(Stringprefix){
40. this.prefix=prefix;
41. }
43. }

import java.io.Serializable; import org.simpleframework.xml.Attribute; import org.simpleframework.xml.Element; import org.simpleframework.xml.Root; @Root(name = "memconf") public class MemBean implements Serializable { private static final long serialVersionUID = 2209681159359089305L; @Attribute private String type; @Element private String ip; @Element private String prefix; public String getType() { return type; } public void setType(String type) { this.type = type; } public String getIp() { return ip; } public void setIp(String ip) { this.ip = ip; } public String getPrefix() { return prefix; } public void setPrefix(String prefix) { this.prefix = prefix; } }

AppType源文件

Java代码

2. publicenumAppType{
3. AAAA，
4. BBBB，
5. CCCC，
6. DDDD，
7. EEEE，
8. FFFF，
10. ;
11. }