原文链接 http://blog.csdn.net/ycyangcai/article/details/6643784
Hl7引擎的目标主要是解决将数据按HL7协议的要求标准化，和标准业务的集成和不同系统间标准业务数据的同步。在多年的医院信息化过程中，HL7标准组织和解析最复杂了，下面是我用了多年HL7引擎解析，主要有两个版本1.C#,2.JAVA版的。
本次公开JAVA的
1 //引擎类:
2
3 package com.xxxx.hl7;
4 import java.io.FileOutputStream;
5 import java.io.IOException;
6 import java.io.OutputStreamWriter;
7 import java.io.Writer;
8 import java.util.List;
9 import org.dom4j.Document;
10 import org.dom4j.DocumentHelper;
11 import org.dom4j.Element;
12 import org.dom4j.Node;
13 import org.dom4j.io.OutputFormat;
14 import org.dom4j.io.XMLWriter;
15 //HL7 转换为XML
16 public class HL7ToXmlConverter {
17 //
18 public static String ConvertToXml(String sHL7){
19 Document document = ConvertToXmlObject(sHL7);
20 String hl7str = document.asXML();
21 return hl7str;
22 }
23 //
24 public static String ConvertToXml(Document document){
25 String hl7str = document.asXML();
26 return hl7str;
27 }
28
29 public static Document ConvertToXmlObject(String sHL7){
30 Document document = CreateXmlDoc();
31 //把HL7分成段
32 String[] sHL7Lines = sHL7.split("
");
33 //去掉XML的关键字
34 for (int i = 0; i < sHL7Lines.length; i++){
35 sHL7Lines[i] = sHL7Lines[i].replace("^~\&", "").replace("MSH", "MSH|");
36 }
37 for (int i = 0; i < sHL7Lines.length; i++){
38 // 判断是否空行
39 if (sHL7Lines[i] != null){
40 String sHL7Line = sHL7Lines[i];
41 //通过/r 或/n 回车符分隔
42 String[] sFields = GetMessgeFields(sHL7Line);
43 // 为段(一行)创建第一级节点
44 Element el = document.getRootElement().addElement(sFields[0]);
45 // 循环每一行
46 Boolean isMsh=true;
47 for (int a = 1; a < sFields.length; a++){
48 //是否包括HL7的连接符^~\&
49 if (sFields[a].indexOf('^')>0 || sFields[a].indexOf('~')>0 || sFields[a].indexOf('\')>0 || sFields[a].indexOf('&')>0 ){
50 //0:如果这一行有任一分隔符
51 //开始操作~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
52 //通过~分隔
53 String[] sComponents = GetRepetitions(sFields[a]);
54 if (sComponents.length > 1){
55 //1:如果可以分隔 0001^郭靖^体检号^EQ^AND~0002^东一区^病区号^EQ^AND
56 for (int b = 0; b < sComponents.length; b++){
57 // Element fieldEl1 = el.addElement(sFields[0] + "." + a);
58 CreateComponents(el,sComponents[b],sFields[0],a,b);
59 }
60 }
61 else{
62 //1:如果真的只有一个值的 0001^郭靖^体检号^EQ^AND
63 // 为字段创建第二级节点
64 // Element fieldEl = el.addElement(sFields[0] + "." + a);
65 CreateComponents(el,sFields[a],sFields[0],a,0);
66 //fieldEl.setText(sFields[a]+"11111111111111");
67 }
68 //~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
69 }
70 else{
71 //0:如果这一行没有任何分隔符
72 // 为字段创建第二级节点
73 Element fieldEl = el.addElement(sFields[0] + "." + a);
74 fieldEl.setText(sFields[a]);
75 }
76 }
77 }//end if
78 }//end for
79 //修改MSH.1 和 MSH.2的值
80 document.selectSingleNode("HL7Message/MSH/MSH.1").setText("|");
81 document.selectSingleNode("HL7Message/MSH/MSH.2").setText("~^\&");
82 // document.selectNodes("MSH/MSH.1");
83 return document;
84 }
85 @SuppressWarnings("unused")
86 private static Element CreateComponents(final Element el,final String hl7Components,String sField,int a,int b){
87 Element componentEl = el.addElement(sField + "." + a);
88 // Element componentEl =el;//.addElement(sField + "." + a + "." + b);
89 //&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
90 //通过&分隔
91 String[] subComponents = GetSubComponents(hl7Components);
92 if (subComponents.length > 1){
93 //2.如果有字组，一般是没有的。。。 子分组 用&很少用
94 }
95 else{
96 //2.如果没有了，就用^分组
97 String[] sRepetitions = GetComponents(hl7Components);
98 if (sRepetitions.length > 1){
99 Element repetitionEl = null;
100 for (int c = 0; c < sRepetitions.length; c++){
101 repetitionEl = componentEl.addElement(sField + "." + a + "." + (c+1));
102 repetitionEl.setText(sRepetitions[c]);
103 }
104 }
105 else{
106 componentEl.setText(hl7Components);
107 }
108 }
109 //&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&
110 return el;
111 }
112
113 /// <summary>
114 /// 通过|分隔 字段
115 /// </summary>
116 /// <param name="s"></param>
117 /// <returns></returns>
118
119 private static String[] GetMessgeFields(String s){
120 return s.split("\|");
121 }
122 /// <summary>
123 /// 通过^分隔 组字段
124 /// </summary>
125 /// <param name="s"></param>
126 /// <returns></returns>
127
128 private static String[] GetComponents(String s){
129 return s.split("\^");
130 }
131 /// <summary>
132 /// 通过&分隔 子分组组字段
133 /// </summary>
134 /// <param name="s"></param>
135 /// <returns></returns>
136
137 private static String[] GetSubComponents(String s){
138 return s.split("&");
139 }
140 /// <summary>
141 /// 通过~分隔 重复
142 /// </summary>
143 /// <param name="s"></param>
144 /// <returns></returns>
145 private static String[] GetRepetitions(String s){
146 return s.split("~");
147 }
148 /// <summary>
149 /// 创建XML对象
150 /// </summary>
151 /// <returns></returns>
152 private static Document CreateXmlDoc(){
153 Document output = DocumentHelper.createDocument();
154 //生成一个接点
155 Element rootNode = output.addElement("HL7Message");
156 return output;
157 }
158 public static String GetText(Document document, String path){
159 Node node = document.selectSingleNode("HL7Message/"+path);
160 if (node != null){
161 return node.getText();
162 }
163 else{
164 return null;
165 }
166 }
167 public static String GetText(Document document, String path,int index){
168 List nodes = document.selectNodes("HL7Message/"+path);
169 if(nodes!=null){
170 return ((Node)nodes.get(index)).getText();
171 }
172 else{
173 return null;
174 }
175 }
176
177 //
178 public static List GetTexts(Document document, String path){
179 List nodes = document.selectNodes("HL7Message/"+path);
180 return nodes;
181 }
182
183 //
184 public static void writeDocument(Document document, String filepath){
185 try{
186 //读取文件
187 // FileWriter fileWriter = new FileWriter(filepath);
188 Writer writer = new OutputStreamWriter(new FileOutputStream(filepath),"utf-8");
189 //设置文件编码
190 OutputFormat xmlFormat = new OutputFormat();
191 xmlFormat.setEncoding("utf-8");
192 //创建写文件方法
193 XMLWriter xmlWriter = new XMLWriter(writer,xmlFormat);
194 //写入文件
195 xmlWriter.write(document);
196 //关闭
197 xmlWriter.close();
198 }catch(IOException e){
199 System.out.println("文件没有找到");
200 e.printStackTrace();
201 }
202 }
203 }
单元测试调用类：
1 String myHL7string="MSH|^~\&|455755610_0100||0200||20110624160404|000|QRY^A19^QRY_A19|0123456001|P|2.6
QRD|||||||||0001^郭靖^体检号^EQ^AND~0002^东一区^病区号^EQ^AND
QRF||20110627|20110803";
2 Document document = HL7ToXmlConverter.ConvertToXmlObject(myHL7string);
3 //获取事件
4 String eventName = HL7ToXmlConverter.GetText(document, "MSH/MSH.9/MSH.9.3");
5 System.out.println("eventName:"+eventName);
6 // List nodeValue = document.selectNodes("MSH.1");
7 String nodeValue = document.selectSingleNode("HL7Message/MSH/MSH.1").getText();
8 String nodeValue2 = document.selectSingleNode("HL7Message/MSH/MSH.3").getText();
9 // DocumentElement.SelectNodes(path);
10 System.out.println(nodeValue+":"+nodeValue2);
11 String value = HL7ToXmlConverter.GetText(document, "QRD/QRD.9/QRD.9.1",0);
12 String value1 = HL7ToXmlConverter.GetText(document, "QRD/QRD.9/QRD.9.1",1);
13 String value2 = HL7ToXmlConverter.GetText(document, "QRD/QRD.9/QRD.9.1");
14 System.out.println(value+":"+value1+":"+value2);
15 List<Node> list = HL7ToXmlConverter.GetTexts(document, "QRD/QRD.9/QRD.9.1");
16 for(Node node : list)
17 {
18 System.out.println(":"+node.getText());
19 }
20 System.out.println(HL7ToXmlConverter.ConvertToXml(myHL7string));