Java|XML 的 RUD Java|技术

在工作中使用 XML 已经很长时间了，不过长久以来都是进行的读操作，或者在生成 XML 时完全使用 StringBuffer 来构造。进行完整的读取、添加、删除、修改还是最近的事情。在这里我采用的是 DOM4J，其实呢这些内容都很简单，如果愿意，各位大可直接参考官方的 Cookbook（http://www.dom4j.org/cookbook.html）和 Quick Start（http://www.dom4j.org/guide.html）。

对于给定的 XML 文件，其结构如下：

【Java|XML 的 RUD】
10290

10286

10287

为以上 XML 文件构造 Propertys 类：

public class Propertys {

private String name;
private String description;
private String field; public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getField() {
return field;
}
public void setField(String field) {
this.field = field;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

读取方法（返回包含 Propertys 的列表）：

public List getAll() {
List list = new ArrayList();
try {
InputStream is = getClass().getResourceAsStream("/navigation.xml");
SAXReader reader = new SAXReader();
Document document = reader.read(is);
Element root = document.getRootElement();
Iterator lv = root.elementIterator("propertset");
Element el = null;
while (lv.hasNext()) {
Propertys property=new Propertys();
el = (Element) lv.next();
property.setName(el.attributeValue("name"));
property.setDescription(el.attributeValue("description"));
property.setField(el.elementText("field"));
list.add(property);
}
} catch (Exception e) {
e.printStackTrace();
}
return list;
}

添加新节点（成功返回 1 否则 0）：

public int saveProperty(Propertys property) {
try {
InputStream is = getClass().getResourceAsStream("/navigation.xml");
SAXReader reader = new SAXReader();
Document document = reader.read(is);
Element root = document.getRootElement();
root.addElement("propertset")
.addAttribute("name",property.getName())
.addAttribute("description",property.getDescription())
.addElement("field").addText(property.getField());

OutputFormat outformat = OutputFormat.createPrettyPrint();
outformat.setEncoding("GBK");
FileWriter out = new FileWriter(
System.getProperty("user.dir")
+"/web/WEB-INF/classes/navigation.xml");
XMLWriter writer=new XMLWriter(out,outformat);
writer.write(document);
writer.close();
return 1;
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}

更新节点（按照 name 属性查找）：

public int updateProperty(String pro,Propertys property) {
try {
InputStream is = getClass().getResourceAsStream("/navigation.xml");
SAXReader reader = new SAXReader();
Document document = reader.read(is);
Element root = document.getRootElement();
Iterator lv = root.elementIterator("propertset");
Element el = null;
while (lv.hasNext()) {
el = (Element) lv.next();
if (el.attributeValue("name").equals(pro)) {
el.setAttributeValue("name",property.getName());
el.setAttributeValue("description",property.getDescription());
el.element("field").setText(property.getField());
}
}OutputFormat outformat = OutputFormat.createPrettyPrint();
outformat.setEncoding("GBK");
FileWriter out = new FileWriter(
System.getProperty("user.dir")
+"/web/WEB-INF/classes/navigation.xml");
XMLWriter writer=new XMLWriter(out,outformat);
writer.write(document);
writer.close();
return 1;
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}

删除节点：

public int delProperty(String pro) {
try {
InputStream is = getClass().getResourceAsStream("/navigation.xml");
SAXReader reader = new SAXReader();
Document document = reader.read(is);
Element root = document.getRootElement();
Iterator lv = root.elementIterator("propertset");
Element el = null;
while (lv.hasNext()) {
el = (Element) lv.next();
if (el.attributeValue("name").equals(pro)) {
el.detach();
}
}OutputFormat outformat = OutputFormat.createPrettyPrint();
outformat.setEncoding("GBK");
FileWriter out = new FileWriter(
System.getProperty("user.dir")
+"/web/WEB-INF/classes/navigation.xml");
XMLWriter writer=new XMLWriter(out,outformat);
writer.write(document);
writer.close();
return 1;
} catch (Exception e) {
e.printStackTrace();
}
return 0;
}

（请注意！引用、转贴本文应注明原作者：Rosen Jiang以及出处：http://blog.csdn.net/rosen）