本文實例為大家分享了java操作xml工具類的具體代碼，供大家參考，具體內容如下
一、代碼
|
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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
|
public class xmlutil { /** * 將xml文件輸出到指定的路徑 * * @param doc * @param filename * @throws exception */ public static void outputxml(document doc, string filename) throws exception { transformerfactory tf = transformerfactory.newinstance(); transformer transformer = tf.newtransformer(); domsource source = new domsource(doc); transformer.setoutputproperty(outputkeys.encoding, "utf-8"); transformer.setoutputproperty(outputkeys.indent, "yes"); printwriter pw = new printwriter(new fileoutputstream(filename)); streamresult result = new streamresult(pw); transformer.transform(source, result); system.out.println("生成xml文件成功!"); } /** * 生成xml * * @param ip * @return */ public static document generatexml(string ip) { document doc = null; element root = null; try { documentbuilderfactory factory = documentbuilderfactory .newinstance(); documentbuilder builder = factory.newdocumentbuilder(); doc = builder.newdocument(); root = doc.createelement("errordevices"); doc.appendchild(root); } catch (exception e) { e.printstacktrace(); return null;// 如果出現異常，則不再往下執行 } element element; element = doc.createelement("errordevice"); element.setattribute("ip", ip); element.setattribute("date", stringutil.formatdate(new date(), "yyyy-mm-dd hh:mm:ss")); element.setattribute("status", "1"); root.appendchild(element); return doc; } /** * 新增xml節點 * * @param ip * @param filename * @return * @throws filenotfoundexception * @throws transformerexception */ public static void towrite(string filename, string ip) throws filenotfoundexception, transformerexception { string date = stringutil.formatdate(new date(), "yyyy-mm-dd hh:mm:ss"); documentbuilderfactory factory = documentbuilderfactory.newinstance(); documentbuilder builder = null; document doc = null; try { builder = factory.newdocumentbuilder(); doc = builder.parse(new file(filename)); } catch (parserconfigurationexception e) { e.printstacktrace(); } catch (saxexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } nodelist links = doc.getelementsbytagname("errordevice"); if (links.getlength() > 0) { for (int i = 0; i < links.getlength(); i++) { node nd = links.item(i); node catparent = nd.getparentnode(); element ele = (element) nd; string url = ele.getattribute("ip"); if (url.equals(ip)) { // ele.setattribute("date", date); catparent.removechild(nd); } } } element element = doc.createelement("errordevice"); element.setattribute("ip", ip); element.setattribute("date", stringutil.formatdate(new date(), "yyyy-mm-dd hh:mm:ss")); element.setattribute("status", "1"); doc.getdocumentelement().appendchild(element); transformerfactory tf = transformerfactory.newinstance(); transformer transformer = tf.newtransformer(); domsource source = new domsource(doc); transformer.setoutputproperty(outputkeys.encoding, "utf-8"); transformer.setoutputproperty(outputkeys.indent, "yes"); printwriter pw = new printwriter(new fileoutputstream(filename)); streamresult result = new streamresult(pw); transformer.transform(source, result); system.out.println("新增xml節點成功!"); } /** * 讀取xml * * @param filename * @return */ public static list<map> readxml(string filename){ documentbuilderfactory factory = documentbuilderfactory.newinstance(); documentbuilder builder = null; document doc = null; try { builder = factory.newdocumentbuilder(); doc = builder.parse(new file(filename)); } catch (parserconfigurationexception e) { e.printstacktrace(); } catch (saxexception e) { e.printstacktrace(); } catch (ioexception e) { e.printstacktrace(); } nodelist links = doc.getelementsbytagname("errordevice"); list<map> list = new arraylist<map>(); for(int i = 0; i< links.getlength() ; i ++){ element node = (element)links.item(i); map map = new hashmap(); map.put(node.getattribute("ip"), node.getattribute("date")); list.add(map); } return list; }} |
二、演示xml
|
1
2
3
4
5
|
<?xml version="1.0" encoding="utf-8" standalone="no"?><errordevices> <errordevice date="2017-03-13 12:54:16" ip="20.100.156.42" status="1"/> <errordevice date="2017-03-13 12:54:56" ip="20.100.156.41" status="1"/></errordevices> |
三、最終效果圖
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/u010823625/article/details/61920159
