一道关于xml的题

Question

1.创建项目web
2.webroot创建一个文件夹xml
3.创建一个servlet:createAction:负责创建一个xml/1012.xml(50%)
    <students>
        <student sid="1">
            <sname>XXX</sname>
            <sex>男</sex>
            <age>22</age>
        </student>

    </students>
4.创建一个servlet:showAction:读取xml/1012.xml,返回到一个show.jsp的页面(50%)
    将xml的内容,以table的方式显示
        编号  姓名  性别  年龄

     5.servlet的调用 通过index.jsp
       创建两个超链接
            创建xml       读取xml

Answer 1

[code="java"] /**
* 创建 xml
* @throws IOException
*/
public void createAction() throws IOException{
Document doc = DocumentHelper.createDocument();

    Element root = doc.addElement("students");
    Element student = root.addElement("student");
    student.addAttribute("sid", "1");
    student.addElement("sname").addText("XXX");
    student.addElement("sex").addText("男");
    student.addElement("age").addText("22");

    String filePath = getServletContext().getRealPath("xml/1012.xml");
    PrintWriter pw = new PrintWriter(filePath);
    OutputFormat format = OutputFormat.createPrettyPrint();
    format.setEncoding("utf-8");
    format.setIndentSize(4);

    XMLWriter writer = new XMLWriter(pw, format);
    writer.write(doc);
    writer.flush();
    writer.close();
}
/**
 * 读取 xml
 * @return
 * @throws Exception 
 */
@SuppressWarnings("unchecked")
public List<Map<String,String>> showAction() throws Exception{
    List<Map<String,String>> list = new ArrayList<Map<String,String>>();

    String filePath = getServletContext().getRealPath("xml/1012.xml");
    SAXReader reader = new SAXReader();
    File file = new File(filePath);
    if (!file.exists()){
        return list;
    }
    Document doc = reader.read(file);
    Element root = doc.getRootElement();
    List<Element> list_stu = root.selectNodes("student");
    for (Element stu : list_stu){
        Map<String,String> row = new HashMap<String,String>();
        row.put("sid", stu.attributeValue("sid"));
        row.put("sname", stu.elementText("sname"));
        row.put("sex", stu.elementText("sex"));
        row.put("age", stu.elementText("age"));
        list.add(row);
    }
    return list;
}[/code]

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