java读取XML

方法不在多，能用就好。

我采用的是dom4j

1<dependency>
2     <groupId>dom4j</groupId>
3     <artifactId>dom4j</artifactId>
4     <version>1.6.1</version>
5    </dependency>

读取的文件内容如下：

1<?xml version="1.0" encoding="UTF-8"?>
2<users>
3    <module id="1">
4        <user index="1">
5            <name>tom</name>
6            <password>12345</password>
7            <date>20150526</date>
8        </user>
9        <user index="2">
10            <name>jack</name>
11            <password>5%</password>
12            <date>20150526</date>
13        </user>
14        <user index="3">
15            <name>john</name>
16            <password>5%</password>
17            <date>20150526</date>
18        </user>
19    </module>
20</users>

读取思路是：

1. 创建一个SAXReader实例;

2. 创建一个文件读取BufferedReader实例;

3. 创建一个Document实例读取BufferedReader;

4. 获取xml文件的根节点;

5. 获取根节点的子节点;

6. 遍历子节点，获取节点名用getName(),获取节点的值用getText(),获取属性值用attributeValue(String)

获取根节点的代码如下：

1public static List<Element> readXml(String FilePath){
2        BufferedReader in = null;
3        List<Element> elementlist = null;
4        Document doc = null;
5        
6        SAXReader reader = new SAXReader();
7        try {
8            in = new BufferedReader(new FileReader(FilePath));
9        } catch (FileNotFoundException e) {
10            // TODO Auto-generated catch block
11            e.printStackTrace();
12        }
13        try {
14            doc = reader.read(in);
15        } catch (DocumentException e) {
16            // TODO Auto-generated catch block
17            e.printStackTrace();
18        }
19        
20        Element root = doc.getRootElement();
21        elementlist = root.elements();
22        
23        return elementlist;
24        
25    }

遍历子节点, 读取用户名和密码的代码如下：

1@SuppressWarnings("unchecked")
2    public List<HashMap<String, String>> readUserDotXML(String path, String module_id){
3        List<HashMap<String, String>> users = new ArrayList<HashMap<String, String>>();
4        String rootPath = path;
5        List<Element> list = ReadXML.readXml(rootPath);
6        if (list != null) {
7            for (Element ele : list) {
8                String index = ele.attributeValue("id");
9                if(module_id.equals(index)){
10                    List<Element> userList = ele.elements();
11                    if(userList != null && userList.size()>0){
12                        for (Element user : userList) {
13                            HashMap<String,String> hashMap = new HashMap<String, String>();
14                            Element name = user.element("name");
15                            Element password = user.element("password");
16                            String nameValue = name.getText();
17                            String passwordValue = password.getText();
18                            hashMap.put("name", nameValue);
19                            hashMap.put("password", passwordValue);
20                            users.add(hashMap);
21                        }
22                    }
23                    
24                    break;
25                }
26            }
27        }
28        
29        return users;
30        
31    }

main函数调用方法如下:

1List<HashMap<String, String>> resultlist= readxml.readUserDotXML("e:/testXML.xml","1");
2
3for (HashMap<String, String> hashMap : resultlist) {
4    System.out.println(hashMap.get("name"));
5    System.out.println(hashMap.get("password"));
6}

使用java总感觉没python那么干脆，这里多几步，那里多几步的。下次对python也总结一下xml读取