使用xml4j xml与字符串之间转换

jar准备：dom4j-2.1.1.jar  jaxen-1.1.6.jar

jaxen/jaxen/ Maven依赖写法

<dependency>
　　<groupId>jaxen</groupId>
　　<artifactId>jaxen</artifactId>
　　<version>1.1.6</version>
</dependency>

<dependency>
　　<groupId>org.dom4j</groupId>
　　<artifactId>com.springsource.org.dom4j</artifactId>
　　<version>2.1.1</version>
</dependency>

1 字符串转对象步骤如下：

 1 package xml;
 2
 3 import org.dom4j.Document;
 4 import org.dom4j.DocumentHelper;
 5 import org.dom4j.Element;
 6 import utils.ClassRoom;
 7 import utils.Person;
 8
 9 import java.util.ArrayList;
10 import java.util.List;
11
12 public class ParseXmlStringToBean {
13
14     private static String getPropetyValue(Document doc, String rootPath, String defaultValue) {
15         if (doc.selectNodes(rootPath).size() == 0) {
16             return defaultValue;
17         }
18         return ((Element) doc.selectNodes(rootPath).get(0)).getText();
19     }
20
21     private static int getPropetyValue(Document doc, String rootPath, int defaultValue) {
22         if (doc.selectNodes(rootPath).size() == 0) {
23             return defaultValue;
24         }
25         return Integer.parseInt(((Element) doc.selectNodes(rootPath).get(0)).getText());
26     }
27
28     private static List<Person> parsePerson(Document doc, String rootPath) {
29         if (doc.selectNodes(rootPath).size() == 0) {
30             return null;
31         }
32         int size = doc.selectNodes(rootPath).size();
33         List<Person> personList = new ArrayList<Person>();
34         for (int i = 0; i < size; i++) {
35             Person person = new Person();
36             person.setName(((Element) doc.selectNodes(rootPath + "/" + "name").get(i)).getText());
37             person.setSex(((Element) doc.selectNodes(rootPath + "/" + "sex").get(i)).getText());
38             person.setAge(Integer.parseInt(((Element) doc.selectNodes(rootPath + "/" + "age").get(i)).getText()));
39             personList.add(person);
40         }
41         return personList;
42     }
43
44     private static ClassRoom parseXmlString(String context) throws Exception {
45         ClassRoom classRoom = new ClassRoom();
46         Document doc = DocumentHelper.parseText(context);
47
48         classRoom.setClassName(getPropetyValue(doc, "/data/className", ""));
49         classRoom.setTotalNum(getPropetyValue(doc, "/data/ret_Code", 0));
50         classRoom.setPersonList(parsePerson(doc, "/data/list/items/item"));
51         return classRoom;
52     }
53
54     public static void main(String[] args) throws Exception {
55         String classContent = "<?xml version=\"1.0\" encoding=\"GBK\"?>\n" +
56                 "<data><className>1班</className><totailNum>3</totailNum><list><items><item><name>张三</name><sex>男</sex><age>44</age></item><item><name>李四</name><sex>男</sex><age>42</age></item><item><name>王五</name><sex>男</sex><age>22</age></item></items></list></data>\n";
57
58         parseXmlString(classContent);
59     }
60 }

2 对象转字符串

 1 package xml;
 2
 3 import org.dom4j.Document;
 4 import org.dom4j.DocumentHelper;
 5 import org.dom4j.Element;
 6 import utils.ClassRoom;
 7 import utils.Person;
 8
 9 import java.util.ArrayList;
10 import java.util.List;
11
12 public class WriteXmlToString {
13
14     private static String writePersonXml(Person person) {
15         Document doc = DocumentHelper.createDocument();
16         doc.setXMLEncoding("GBK");
17
18         Element root = doc.addElement("data");
19         root.addElement("name").addText(person.getName());
20         root.addElement("sex").addText(person.getSex());
21         root.addElement("age").addText(String.valueOf(person.getAge()));
22         return doc.asXML();
23     }
24
25     private static String writeClassXml(ClassRoom classRoom) {
26         Document doc = DocumentHelper.createDocument();
27         doc.setXMLEncoding("GBK");
28
29         Element root = doc.addElement("data");
30         root.addElement("className").addText(classRoom.getClassName());
31         root.addElement("totailNum").addText(String.valueOf(classRoom.getTotalNum()));
32         Element perList = root.addElement("list");
33         Element perItems = perList.addElement("items");
34         for (Person person : classRoom.getPersonList()) {
35             Element perItem = perList.addElement("item");
36             perItem.addElement("name").addText(person.getName());
37             perItem.addElement("sex").addText(person.getSex());
38             perItem.addElement("age").addText(String.valueOf(person.getAge()));
39         }
40         return doc.asXML();
41     }
42
43     public static void main(String[] args) {
44         String content = writePersonXml(new Person("张三", "男", 44));
45         System.out.println(content);
46
47         List<Person> personList = new ArrayList<Person>();
48         personList.add(new Person("张三", "男", 44));
49         personList.add(new Person("李四", "男", 42));
50         personList.add(new Person("王五", "男", 22));
51         ClassRoom classRoom = new ClassRoom("1班", personList.size(), personList);
52         String classContent = writeClassXml(classRoom);
53         System.out.println(classContent);
54     }
55 }

运行结果

<?xml version="1.0" encoding="GBK"?>
<data>
<name>张三</name>
<sex>男</sex>
<age>44</age>
</data>

<?xml version="1.0" encoding="GBK"?>
<data>
<className>1班</className><totailNum>3</totailNum>
<list>
<items>
<item><name>张三</name><sex>男</sex><age>44</age></item>
<item><name>李四</name><sex>男</sex><age>42</age></item>
<item><name>王五</name><sex>男</sex><age>22</age></item>
</items>
</list>
</data>