考虑减少不必要业务对数据库的影响，将不重要的通告展示交由xml存储，这就有了XMLUtil工具类：
注意写入xml路径问题，单个java文件路径会在src下，这里指定文件路径在tomcat下；然后这个util针对Notice实体开发，可自行修改。
<pre name="code" class="java">package com.dayang.audit.utils;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import net.sf.json.JSONArray;
import org.dom4j.Document;
import org.dom4j.Element;
import org.dom4j.io.OutputFormat;
import org.dom4j.io.SAXReader;
import org.dom4j.io.XMLWriter;
public class XMLUtil {
private static String fileURL="notice.xml";
/**
* 获取XML中所有的通告信息
* @return
*/
public static List<Notice> getAllNotice(){
Document document=getDocument();
Element rootElement=document.getRootElement();
List<Element> noticeElements=rootElement.elements();
List<Notice> notices=new ArrayList<Notice>();
for (Element noticeElement : noticeElements) {
Notice notice=new Notice();
notice.setId(noticeElement.attributeva lue("id"));
notice.setTitle(noticeElement.element("title").getTextTrim());
notice.setPriority(noticeElement.element("priority").getTextTrim());
notice.setContent(noticeElement.element("content").getTextTrim());
notice.setStarttime(noticeElement.element("starttime").getTextTrim());
notice.setEndtime(noticeElement.element("endtime").getTextTrim());
notices.add(notice);
}
return notices;
}
/**
* 条件获取XML中所有的通告信息
* @return
*/
public static List<Notice> selectNoticeByTime(String time){
Document document=getDocument();
Element rootElement=document.getRootElement();
List<Element> noticeElements=rootElement.elements();
List<Notice> notices=new ArrayList<Notice>();
for (Element noticeElement : noticeElements) {
System.out.println(noticeElement.element("starttime").getTextTrim());
if(noticeElement.element("starttime").getTextTrim().compareTo(time) <= 0
&& noticeElement.element("endtime").getTextTrim().compareTo(time) >= 0){
Notice notice=new Notice();
notice.setId(noticeElement.attributeva lue("id"));
notice.setTitle(noticeElement.element("title").getTextTrim());
notice.setPriority(noticeElement.element("priority").getTextTrim());
notice.setContent(noticeElement.element("content").getTextTrim());
notice.setStarttime(noticeElement.element("starttime").getTextTrim());
notice.setEndtime(noticeElement.element("endtime").getTextTrim());
notices.add(notice);
}
}
return notices;
}
/**
* 获取某一个Id的信息
* @return
*/
public static Notice findById(String id){
Document document=getDocument();
Element rootElement=document.getRootElement();
List<Element> noticeElements=rootElement.elements();
Notice notice=new Notice();
for (Element noticeElement : noticeElements) {
if(noticeElement.attributeva lue("id").equals(id)){
notice.setId(noticeElement.attributeva lue("id"));
notice.setTitle(noticeElement.element("title").getTextTrim());
notice.setPriority(noticeElement.element("priority").getTextTrim());
notice.setContent(noticeElement.element("content").getTextTrim());
notice.setStarttime(noticeElement.element("starttime").getTextTrim());
notice.setEndtime(noticeElement.element("endtime").getTextTrim());
return notice;
}
}
return notice;
}
/**
* 向XML文件中添加一个notice(不允许为空)
* @param notice
*/
public static void add(Notice notice){
Document document=getDocument();
Element rootElement=document.getRootElement();
Element noticeElement=rootElement.addElement("notice");
noticeElement.addAttribute("id",getMaxId()+1+"");
Element titleElement=noticeElement.addElement("title");
Element priorityElement=noticeElement.addElement("priority");
Element contentElement=noticeElement.addElement("content");
Element starttimeElement=noticeElement.addElement("starttime");
Element endtimeElement=noticeElement.addElement("endtime");
titleElement.setText(notice.getTitle());
priorityElement.setText(notice.getPriority());
contentElement.setText(notice.getContent());
starttimeElement.setText(notice.getStarttime());
endtimeElement.setText(notice.getEndtime());
write2XML(document);
}
/**
* 根据id删除notice
* @param id
*/
public static void deleteById(String id){
Document document=getDocument();
Element rootElement=document.getRootElement();
List<Element> noticeElements=rootElement.elements("notice");
for (Element noticeElement : noticeElements) {
if(noticeElement.attributeva lue("id").equals(id)){
System.out.println("开始删除.....");
rootElement.remove(noticeElement);
System.out.println("删除结束.....");
}
}
write2XML(document);
}
/**
* 修改notice信息
* @param notice
*/
public static void update(Notice notice){
Document document=getDocument();
Element rootElement=document.getRootElement();
List<Element> noticeElements=rootElement.elements();
for (Element noticeElement : noticeElements) {
if(noticeElement.attributeva lue("id").equals(notice.getId())){
List<Element> elements=noticeElement.elements();
noticeElement.element("title").setText(notice.getTitle());
noticeElement.element("priority").setText(notice.getPriority());
noticeElement.element("content").setText(notice.getContent());
noticeElement.element("starttime").setText(notice.getStarttime());
noticeElement.element("endtime").setText(notice.getEndtime());
}
}
write2XML(document);
}
/**
* 获取根节点
* @return rootElement
*/
public static Document getDocument(){
try {
SAXReader saxReader=new SAXReader();
// InputStream in=XMLUtil.class.getResourceAsStream("/notice.xml");//拿取src下文件
String filePath = getProjectPath().substring(1)+fileURL;
File file = new File(filePath);
if(!file.exists()){
String oldPath =getSrcPath()+fileURL;
copyFile(oldPath, filePath);
}
System.out.println(filePath);
InputStream in=new FileInputStream(filePath);
Document document=saxReader.read(in);
return document;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
/**
* 把内容写到XML文件中
* @param document
*/
public static void write2XML(Document document){
try {
OutputFormat format=new OutputFormat(" ", true, "utf-8");
format.setTrimText(true);
XMLWriter writer = new XMLWriter(format);
writer.setOutputStream(new FileOutputStream(getProjectPath()+fileURL));
// writer.setOutputStream(new FileOutputStream("src/"+fileURL));
writer.write(document);
writer.close();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
/**
* 获取xml文件中noticeId的最大值
* @return int
*/
public static int getMaxId(){
int maxId=0;
Document document=getDocument();
Element rootElement=document.getRootElement();
List<Element> noticeElements=rootElement.elements();
for (Element element : noticeElements) {
int id=Integer.valueOf(element.attributeva lue("id"));
if(maxId<id){
maxId=id;
}
}
return maxId;
}
/**
* 得到工程的物理路径(例如:D:/Workspaces/)
* @return
* @throws Exception
*/
public static String getProjectPath() {
String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();
System.out.println(path);
path = path.replace("file:/", "");
path = path.replace("WEB-INF/classes/", "");
path = path.replace("WebContent/", "");
path = path.replace("CCTVCensorAndroid/", "");
path = path.replace("%20", " ");
// path+="\\CCTVCensorAndroid\\WEB-INF\\classes\\";
return path;
}
/**
* 得到项目src路径(例如:/D:/lgl/Workspaces/CCTVCensorAndroid/WebContent/WEB-INF/classes/notice.xml)
* @return
* @throws Exception
*/
public static String getSrcPath() {
String path = Thread.currentThread().getContextClassLoader().getResource("").getPath();
System.out.println(path);
path = path.replace("file:/", "");
path = path.replace("%20", " ");
return path;
}
/**
* 复制单个文件
*
* @param oldPath
* String 原文件路径 如：c:/fqf.txt
* @param newPath
* String 复制后路径 如：f:/fqf.txt
* @return boolean
*/
public static void copyFile(String oldPath, String newPath) {
try {
int bytesum = 0;
int byteread = 0;
File oldfile = new File(oldPath);
if (oldfile.exists()) { // 文件存在时
InputStream inStream = new FileInputStream(oldPath); // 读入原文件
FileOutputStream fs = new FileOutputStream(newPath);
byte[] buffer = new byte[1444];
int length;
while ((byteread = inStream.read(buffer)) != -1) {
bytesum += byteread; // 字节数 文件大小
fs.write(buffer, 0, byteread);
}
inStream.close();
}
} catch (Exception e) {
System.out.println("复制单个文件操作出错");
e.printStackTrace();
}
}
public static void main(String[] args) {
// Notice nd = new Notice();
// nd.setTitle("程序测试2");
// nd.setPriority("低2");
// nd.setContent("低2");
// nd.setStarttime("20160709");
// nd.setEndtime("20160712");
// add(nd);
// Notice ns = new Notice();
// ns.setId("3");
// ns.setTitle("程序测试1");
// ns.setPriority("低1");
// ns.setContent("低1");
// ns.setStarttime("20160709");
// ns.setEndtime("20160712");
// update(ns);
// deleteById("4");
List<Notice> notices = getAllNotice();
JSONArray fromObject = JSONArray.fromObject(notices);
System.out.println(fromObject.toString());
for(Notice n : notices){
System.out.println(n.toString());
}
}
}
xml文件格式：
<xml version="1.0" encoding="utf-8">
<notice>
<notice id="1">
<starttime>20160705</starttime>
<endtime>20160708</endtime>
<title>测试</title>
<priority>高</priority>
<content>下发通知单</content>
</notice>
</notice>
notice实体大纲：
private String id;
private String title;
private String priority;
private String content;
private String starttime;
private String endtime;