Freemarker 是一款模板引擎,是一种基于模版生成静态文件的通用工具,它是为java程序员提供的一个开发包。以下介绍web应用如何使用freemarker生成静态html。
操作前先引入freemarker的jar包,将freemarker的jar包放到WebContent/WEB-INF/lib 下
1.首先在web工程中新建一个包 com.test.ftl 用来存放模板文件,再新建一个模板文件 hello.ftl，填入如下内容
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
</head>
<body>
<div>
${blog.blogType}
<br>
${blog.blogTitle_ch}
<br>
${blog.article}
</div>
</body>
</html>2. 编写freemarker工具类
package com.test.freemaker;
import java.io.File;
import java.io.FileOutputStream;
import com.google.common.base.Joiner;
import com.test.entity.Blog;
import java.io.FileWriter;
import java.io.IOException;
import java.io.PrintWriter;
import java.io.OutputStreamWriter;
import java.io.OutputStream;
import java.io.Writer;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;
import java.util.Map;
import java.util.Calendar;
import freemarker.template.Configuration;
import freemarker.template.Template;
import freemarker.template.TemplateException;
public class FreemakerUtil {
private Date date = new Date();
private Calendar calendar = Calendar.getInstance();
public static String template="hello.ftl";
public Date getDate() {
return date;
}
private Calendar getCalendar() {
return calendar;
}
private String getTimeUrl() {
SimpleDateFormat s=new SimpleDateFormat("yyyy/MM/dd/");
String curDate = s.format(getCalendar().getTime());
// int year = getCalendar().get(Calendar.YEAR);
// int month =getCalendar().get(Calendar.MONTH)+1;
// int day = getCalendar().get(Calendar.DAY_OF_MONTH);
// int hour = getCalendar().get(Calendar.HOUR_OF_DAY);
return curDate;
// return ""+year+"/"+month+"/"+day+"/";
// return ""+year+"-"+month+"-"+day+" "+hour+":00";
}
public Template geTemplate(String name) {
try {
Configuration cfg = new Configuration();
String templatePath = this.getClass().getClassLoader().getResource("/com/test/ftl").getPath();
cfg.setDefaultEncoding("UTF-8");
// 设定去哪里读取相应的ftl模板文件
cfg.setClassForTemplateLoading(this.getClass(), "/com/test/ftl");
// 在模板文件目录中找到名称为name的文件
Template temp = cfg.getTemplate(name);
return temp;
}catch(Exception e) {
e.printStackTrace();
return null;
}
}
/*控制台输出*/
public void print(String name,Map<String,Object> root) {
try {
// 通过Template可以将模板文件输出到相应的流
Template temp = this.geTemplate(name);
temp.process(root, new PrintWriter(System.out));
}catch(Exception e) {
e.printStackTrace();
}
}
/* 输出html文件*/
public void fprint(String name ,Map<String,Object> root,List<String> list) {
FileWriter out = null;
try {
// 通过一个文件输出流，就可以写到相应的文件中，此处用的是绝对路径
String url =getTimeUrl();
File file = new File("/public/"+url+list.get(0)+"/index.html");
if(!file.exists()) {
file.getParentFile().mkdirs();
file.createNewFile();
}
out = new FileWriter(file);
Template temp = geTemplate(name);
temp.process(root, out);
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
if(out != null) {
out.close();
}
}catch(Exception e) {
e.printStackTrace();
}
}
}
public void fprint(String name,String path,Map<String,Object> root,String title) {
// FileWriter out = null;
Writer writer = null;
try {
// 通过一个文件输出流，就可以写到相应的文件中，此处用的是绝对路径
String url =getTimeUrl();
File file = new File(path+url+title+"/index.html");
if(!file.exists()) {
file.getParentFile().mkdirs();
file.createNewFile();
}
writer=new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
// out = new FileWriter(file);
Template temp = geTemplate(name);
temp.process(root, writer);
}catch(Exception e) {
e.printStackTrace();
}finally {
try {
if(writer != null) {
writer.close();
}
}catch(Exception e) {
e.printStackTrace();
}
}
}
}
3. 编写web控制器,代码中已给出详尽的说明。
@Controller
public class TestController1 {
@RequestMapping("/test")
public void test(Blog blog,HttpServletRequest request,HttpServletResponse response) {
Configuration cfg=new Configuration();
//获取模板路径
String templatePath=this.getClass().getClassLoader().getResource("/com/test/ftl").getPath();
try {
//配置模板路径 cfg.setDirectoryForTemplateLoading(new File(templatePath));
cfg.setDefaultEncoding("UTF-8");
//获取目标模板
Template template = cfg.getTemplate("hello.ftl");
//创建目标html文件
File file=new File(request.getServletContext().getRealPath("/public/"+blog.getBlogTitle_ch()+".html"));
//创建字符输出流
Writer writer=new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
//map用来给模板传递数据，writer将模板内容写入到上面新建的html文件
template.process(map, writer);
writer.flush();
writer.close();
} catch (IOException | TemplateException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
}
}
}4.创建实体类，用来存放提交信息。
import java.io.Serializable;
@SuppressWarnings("serial")
public class Blog implements Serializable {
private int blogId;
private String blogTime;
private String article;
private String blogType;
private String blogTitle_ch;
private String blogTitle_en;
private String time;
public String getBlogTitle_ch() {
return blogTitle_ch;
}
public void setBlogTitle_ch(String blogTitle_ch) {
this.blogTitle_ch = blogTitle_ch;
}
public String getBlogTitle_en() {
return blogTitle_en;
}
public void setBlogTitle_en(String blogTitle_en) {
this.blogTitle_en = blogTitle_en;
}
public int getBlogId() {
return blogId;
}
public void setBlogId(int blogId) {
this.blogId = blogId;
}
public String getBlogTime() {
return blogTime;
}
public void setBlogTime(String blogTime) {
this.blogTime = blogTime;
}
public String getArticle() {
return article;
}
public void setArticle(String article) {
this.article = article;
}
public String getBlogType() {
return blogType;
}
public void setBlogType(String blogType) {
this.blogType = blogType;
}
public String getTime() {
return time;
}
public void setTime(String time) {
this.time = time;
}
}5.前端提交请求
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Test</title>
</head>
<body>
<form id="form1" action="test" method="post">
类型：<input type="text" name="blogType"><br>
题目:<input type="text" name="blogTitle_ch"><br>
内容：<textarea name="article"></textarea><br>
<input type="submit" value="提交">
</form>
</body>
</html>