freemarker集成maven的简单的应用
1.创建本地maven项目 ，在pom.xml中配置freemarker的架包
4.0.0
cn
fmarker
0.0.1-SNAPSHOT
war
org.freemarker
freemarker
2.3.23
2.在webapp的web-inf下的web.xml中配置freemarker的服务
fmarker
index.html
index.htm
index.jsp
default.html
default.htm
default.jsp
freemarker
freemarker.ext.servlet.FreemarkerServlet
TemplatePath
/
NoCache
true
ContentType
text/html;charset=UTF-8
template_update_delay
0
default_encoding
UTF-8
number_format
0.##
1
freemarker
*.ftl
3.在webapp创建一个ftl文件，运行后可以直接在浏览器上输入它的路径
<#list 1..10 as i>
<#if (i_index+1)%2==0>
${i}
<#else>
${i}
4.应用maven ，在数据库创建一张表用来存储，以新闻发布为例 ，新闻的标题 ，内容 ，HTML路径 ，发布时间
5.创建新闻后端上传项目 ，在pom.xml中配置架包
4.0.0
cn
news
0.0.1-SNAPSHOT
war
mysql
mysql-connector-java
5.1.26
org.freemarker
freemarker
2.3.23
org.codehaus.mojo
tomcat-maven-plugin
1.1
UTF-8
6.在src/main/resources中配置数据的资源文件 .properties
url=jdbc:mysql://localhost:3306/news
drclass=com.mysql.jdbc.Driver
userName=root
password=123456 7.配置调用数据源的方法
package model;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
public class Dbuit {
static Properties p = new Properties();
static{
InputStream is = Dbuit.class.getResourceAsStream("/jdbc.properties");
try {
p.load(is);
} catch (IOException e) {
e.printStackTrace();
}
}
/*获取链接
* @return
*
*/
public static Connection getConnection() throws Exception{
String url=p.getProperty("url");
String drclass=p.getProperty("drclass");
String userName=p.getProperty("userName");
String password=p.getProperty("password");
Class.forName(drclass);
//登录成功
Connection conn = DriverManager.getConnection(url,userName,password);
return conn;
}
//执行sql语句
public static int execute(String sql) throws Exception{
//连接数据库
Connection con=getConnection();
//预编译SQL语句
PreparedStatement pst=con.prepareStatement(sql);
//执行SQL语句
int i=pst.executeUpdate();
con.close();
pst.close();
return i;
}
//查询
public static List8.创建新闻上传，查询的方法
package model;
import java.util.List;
import java.util.Map;
public class Mynews {
//发布新闻
public void inserNews(String title,String content,String newspath,String createtime) throws Exception{
String sql="insert into mynews(title,content,htmlpath,createtime)values('"+title+"','"+content+"','"+newspath+"','"+createtime+"')";
Dbuit.execute(sql);
}
//查询新闻
public List9.创建上传新闻的页面
Insert title here
新闻发布
10.controller层servlet的调用
package controller;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import model.Mynews;
/**
* Servlet implementation class News
*/
public class News extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public News() {
// TODO Auto-generated constructor stub
}
//调用插入，查询的方法
Mynews my= new Mynews();
//设计时间格式
SimpleDateFormat sdf= new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
//生成静态HTML存储的位置
public static final String HTML_DIR="E:\\html";
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//设置字符集
response.setContentType("text/html;charset=UTF-8");
request.setCharacterEncoding("UTF-8");
//获取新闻的标题
String title=request.getParameter("title");
//获取新闻的内容
String content=request.getParameter("content");
//获取时间
Date date= new Date();
String dates=sdf.format(date);
//获取唯一的UUID
String uuid=UUID.randomUUID().toString();
try {
//生成HTML
Configuration config=new Configuration(Configuration.VERSION_2_3_23);
//模板文件的位置
config.setDirectoryForTemplateLoading(new File("src/main/resources"));
config.setObjectWrapper(new DefaultObjectWrapper(Configuration.VERSION_2_3_23));
//把值注入HTML
Map root = new HashMap();
root.put("title", title);
root.put("content", content);
root.put("createtime", dates);
////加载模板文件 -- 实例化模板对象
Template temp =config.getTemplate("news.ftl");
//文件的保存路径
String sa=HTML_DIR+"/"+(uuid)+".html";
Writer out =new OutputStreamWriter(new FileOutputStream(sa));
//文件的输出
temp.process(root, out);
out.flush();
out.close();
//新闻上传到数据库
my.inserNews(title, content, (uuid) + ".html", dates);
response.getWriter().println("发布成功...");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request, response);
}
} 11.新闻的模板
${title}
${createtime}
${content} 12.创建前端freemarker项目，在本地pom.xml中配置依赖的架包
4.0.0
cn
new
0.0.1-SNAPSHOT
war
mysql
mysql-connector-java
5.1.26
org.freemarker
freemarker
2.3.23
org.apache.commons
commons-io
1.3.2
org.codehaus.mojo
tomcat-maven-plugin
1.1
UTF-8
13.配置连接数据库的四要素，在src/main/resources中创建 .properties文件
url=jdbc:mysql://localhost:3306/news
drclass=com.mysql.jdbc.Driver
userName=root
password=123456 14.调用封装jdbc的方法类
package model;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
public class Dbuit {
static Properties p = new Properties();
static{
InputStream is = Dbuit.class.getResourceAsStream("/jdbc.properties");
try {
p.load(is);
} catch (IOException e) {
e.printStackTrace();
}
}
/*获取链接
* @return
*
*/
public static Connection getConnection() throws Exception{
String url=p.getProperty("url");
String drclass=p.getProperty("drclass");
String userName=p.getProperty("userName");
String password=p.getProperty("password");
Class.forName(drclass);
//登录成功
Connection conn = DriverManager.getConnection(url,userName,password);
return conn;
}
//执行sql
public static int execute(String sql) throws Exception{
//连接数据库
Connection con=getConnection();
//预编译SQL语句
PreparedStatement pst=con.prepareStatement(sql);
//执行SQL语句
int i=pst.executeUpdate();
con.close();
pst.close();
return i;
}
//查询
public static List15.创建查询新闻的方法
package model;
import java.util.List;
import java.util.Map;
public class Mynews {
//查询
public List16.刷新新闻页面
package main;
import java.util.Timer;
public class Index {
public static void main(String[] args) {
Timer ti= new Timer();
//new执行任务，执行时间，执行第一次之后多少时间之后执行下一次
ti.schedule(new MyTimerTask(), 1000,5000);
}
} 17.生成前端模板
<#list List as new>
<#-- 首页显示新闻的连接与标题-->
${new.title}
18.生成前端首页
package main;
import java.io.File;
import java.io.FileOutputStream;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.TimerTask;
import freemarker.template.Configuration;
import freemarker.template.DefaultObjectWrapper;
import freemarker.template.Template;
import model.Mynews;
public class MyTimerTask extends TimerTask{
//调用查询的方法
Mynews my= new Mynews();
public void run(){
try {
// 生成html
Configuration cfg = new Configuration(Configuration.VERSION_2_3_23);
//模板文件的位置
cfg.setDirectoryForTemplateLoading(new File("src/main/resources"));
cfg.setObjectWrapper(new DefaultObjectWrapper(Configuration.VERSION_2_3_23));
//获取所有的新闻
List19 读取新闻的内容
package main;
import java.io.File;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.commons.io.FileUtils;
/**
* Servlet implementation class NewServler
*/
public class NewServler extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* Default constructor.
*/
public NewServler() {
// TODO Auto-generated constructor stub
}
//新闻存储的位置
public static final String HTML_DIR = "E:\\html\\";
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//获取模板传过来的连接路径
String path=request.getParameter("path");
//完整的文件存储路径
String abs=HTML_DIR+path;
//读取存储的新闻内容
byte[] bt=FileUtils.readFileToByteArray(new File(abs));
//输出到首页连接
response.getOutputStream().write(bt);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
doGet(request, response);
}
} 20.启动后台发布新闻项目，在运行前台新闻首页