JAVA語言利用DOM解析XML文件

利用DOM解析XML文件的時候，會把XML文件預讀的內存中，如果是比較大的XML文件或者是移動設備的話，不建議使用此方法

下面是我解析一個XML文件的詳細代碼

1. import java.io.InputStream;
3. import javax.xml.parsers.DocumentBuilder;
4. import javax.xml.parsers.DocumentBuilderFactory;
6. import org.w3c.dom.Document;
7. import org.w3c.dom.Element;
8. import org.w3c.dom.Node;
9. import org.w3c.dom.NodeList;
11. import com.fujitsu.cn.model.Patent;
12. import com.fujitsu.cn.util.LogHelper;
13. /**
14. * 采用DOM解析xml文件
15. */
16. public class DOMDetailService {
18. public static Patent getPatent(InputStream inStream) throws Exception {
19. Patent patent = new Patent();
21. LogHelper.v("domservice");
23. DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
24. DocumentBuilder db = dbf.newDocumentBuilder();
25. Document document = db.parse(inStream);
27. //通過getDocumentElement()方法獲得該xml文件的根節點
28. Element root = document.getDocumentElement();
29. //獲得以 details為標簽對的所有節點對的列表<details></details>
30. NodeList detailNodes = root.getElementsByTagName("details");
32. //由於本xml文件中只有一個這樣的標簽對，通過item(i)得到該元素，並且進行強制轉化
33. Element patentElement = (Element) detailNodes.item(0);
34. //獲得該標簽下面的所有標簽的節點列表
35. NodeList childList = patentElement.getChildNodes();
37. //對獲得到的節點列表進行遍歷 getLength()可以得到NodeList列表的長度
38. for(int i=0; i<childList.getLength();i++){
39. //遍歷所有的屬性節點 nodelist.item(i)返回一個Node節點
40. Node patentAttribut = (Node)childList.item(i);
42. //由於可能會出現空的節點，對該節點進行判斷，判斷該節點是不是該xml中的元素
43. //Node.ELEMENT_NODE的值為1，表示該節點是一個Element
44. if(patentAttribut.getNodeType() == Node.ELEMENT_NODE){
45. //通過getNodeName()得到該Node的名字
46. //例如遍歷到<type>3</type>，取值以後就是 type
47. String tag = patentAttribut.getNodeName();
48. //getFirstChild()表示獲得該節點下面的第一個孩子，getNodeValue()表示得到該孩子的值
49. //例如遍歷到<type>3</type>通過該函數得到的值為3
50. String val = patentAttribut.getFirstChild().getNodeValue();
51. if("othercontents".equals(tag)){
52. patent.setOthercontents(val);
53. }else
54. if("publiccountry".equals(tag)){
55. patent.setCountry(val);
56. }else
57. if("type".equals(tag)){
58. patent.setType(val);
59. }
60. else
61. if("title".equals(tag)){
62. patent.setTitle(val);
63. }
64. else
65. if("IPC".equals(tag)){
66. patent.setIpc_number(val);
67. }
68. else
69. if("status".equals(tag)){
70. patent.setStatus(val);
71. }
72. else
73. if("pagenum".equals(tag)){
74. patent.setPagenum(val);
75. }
76. else
77. if("submitid".equals(tag)){
78. patent.setSubmit_number(val);
79. }
80. else
81. if("inventors".equals(tag)){
82. patent.setInventor(val);
83. }
84. else
85. if("agent".equals(tag)){
86. patent.setAgent(val);
87. }
88. else
89. if("claims".equals(tag)){
90. patent.setClaims(val);
91. }
92. else
93. if("applicant".equals(tag)){
94. patent.setProposer(val);
95. }
96. }
97. }
98. inStream.close();
99. return patent;
100. }
101. }

對該單元進行測試的測試類如下所示：

1. import java.io.InputStream;
2. import java.util.List;
4. public class Test {
5. public static void main(String[] args) throws Exception {
6. InputStream inStream = new MainTest().getClass().getClassLoader()
7. .getResourceAsStream("detail.xml");
8. Patent p = DOMDetailService.getPatent(inStream);
9. System.out.println(p.getOthercontents());
10. }
11. }

解析的XML文件由於內容太多，已經將其中的內容精簡

1. <?xml version="1.0" encoding="utf-8"?>
2. <response>
3. <details>
4. <othercontents>1</othercontents>
5. <publiccountry>2</publiccountry>
6. <type>3</type>
7. <title>4</title>
8. <IPC>5</IPC>
9. <status>6</status>
10. <pagenum>7</pagenum>
11. <submitid>8</submitid>
12. <submitdate>9</submitdate>
13. <inventors>10</inventors>
14. <agent>11</agent>
15. <claims>12</claims>
16. <applicant>13</applicant>
17. </details>
18. </response>

用到的Model如下所示

1. public class Patent {
2. private String title;
3. private String country;
4. private String type;
5. private String status;
6. private String ipc_number;
7. private String patent_pages;
8. private String submit_number;
9. private String submit_data;
10. private String proposer;
11. private String inventor;
12. private String agent;
13. private String othercontents;
14. private String pagenum;
15. private String articleid;
16. private String claims;
18. public String getTitle() {
19. return title;
20. }
21. public void setTitle(String title) {
22. this.title = title;
23. }
24. public String getCountry() {
25. return country;
26. }
27. public void setCountry(String country) {
28. this.country = country;
29. }
30. public String getType() {
31. return type;
32. }
33. public void setType(String type) {
34. this.type = type;
35. }
36. public String getStatus() {
37. return status;
38. }
39. public void setStatus(String status) {
40. this.status = status;
41. }
42. public String getPatent_pages() {
43. return patent_pages;
44. }
45. public void setPatent_pages(String patentPages) {
46. patent_pages = patentPages;
47. }
48. public String getSubmit_number() {
49. return submit_number;
50. }
51. public void setSubmit_number(String submitNumber) {
52. submit_number = submitNumber;
53. }
54. public String getSubmit_data() {
55. return submit_data;
56. }
57. public void setSubmit_data(String submitData) {
58. submit_data = submitData;
59. }
60. public String getProposer() {
61. return proposer;
62. }
63. public void setProposer(String proposer) {
64. this.proposer = proposer;
65. }
66. public String getInventor() {
67. return inventor;
68. }
69. public void setInventor(String inventor) {
70. this.inventor = inventor;
71. }
72. public String getAgent() {
73. return agent;
74. }
75. public void setAgent(String agent) {
76. this.agent = agent;
77. }
78. public String getIpc_number() {
79. return ipc_number;
80. }
81. public void setIpc_number(String ipcNumber) {
82. ipc_number = ipcNumber;
83. }
84. public String getOthercontents() {
85. return othercontents;
86. }
87. public void setOthercontents(String othercontents) {
88. this.othercontents = othercontents;
89. }
90. public String getPagenum() {
91. return pagenum;
92. }
93. public void setPagenum(String pagenum) {
94. this.pagenum = pagenum;
95. }
96. public String getArticleid() {
97. return articleid;
98. }
99. public void setArticleid(String articleid) {
100. this.articleid = articleid;
101. }
102. public String getClaims() {
103. return claims;
104. }
105. public void setClaims(String claims) {
106. this.claims = claims;
107. }
110. }