动态JSP页生成静态HTML的方法

2024-09-05 00:22:18

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这篇文章主要介绍了动态JSP页生成静态HTML的方法,以实例形式较为详细的分析了JSP生成静态HTML页面的相关技巧,具有一定参考借鉴价值,需要的朋友可以参考下

本文实例讲述了动态JSP页生成静态HTML的方法。分享给大家供大家参考。具体如下：

具体实现：

利用Filter的过滤功能把*.jsp过滤出来，判断是否存在对应的.html文件，如果不存在对应的.html文件，则将其内容读出写入指定的.html文件，再跳转到对应的.html即可。如果存在对应的.html文件，则直接跳转到对应的.html即可。

代码：

JspFilter.java：

import java.io.BufferedReader;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.servlet.Filter;

import javax.servlet.FilterChain;

import javax.servlet.FilterConfig;

import javax.servlet.ServletException;

import javax.servlet.ServletRequest;

import javax.servlet.ServletResponse;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class JspFilter implements Filter {

public void destroy() {

// TODO 自动生成方法存根

}

public void doFilter(ServletRequest request, ServletResponse response,

FilterChain chain) throws IOException, ServletException {

HttpServletRequest hreq = (HttpServletRequest) request;

HttpServletResponse hresp = (HttpServletResponse) response;

String name = hreq.getRequestURL().substring(

hreq.getRequestURL().lastIndexOf("/") + 1,

hreq.getRequestURL().lastIndexOf("."));

if (hreq.getRequestURL().indexOf(".jsp") != -1 && (null == hreq.getParameter("type") || hreq.getParameter("type").equals(""))) {

hresp.sendRedirect(hreq.getContextPath()+"/conversion?name="+hreq.getRequestURL());

return ;

}

chain.doFilter(request, response);

}

public void init(FilterConfig arg0) throws ServletException {

// TODO 自动生成方法存根

}

}

ConversionServlet.java：

import java.io.BufferedReader;

import java.io.File;

import java.io.FileOutputStream;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.io.PrintWriter;

import java.net.HttpURLConnection;

import java.net.URL;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ConversionServlet extends HttpServlet {

public ConversionServlet () {

super();

}

public void destroy() {

super.destroy(); // Just puts "destroy" string in log

// Put your code here

}

public void doGet(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

response.setContentType("text/html");

PrintWriter out = response.getWriter();

//----获取请求的URL

String reqTarget = request.getParameter("name");

//----指定对应JSP的HTML名称

String name = reqTarget.substring(reqTarget.lastIndexOf("/") + 1,reqTarget.lastIndexOf("."));

//---判断是否存在对应的HTML文件

File file = new File(request.getRealPath("/") + name + ".html");

if (!file.exists()) { //--------如果不存在对应的HTML文件

try {

file.createNewFile(); //--------创建HTML文件

//-------将JSP的内容写入对应的HTML文件内

InputStream in;

StringBuffer sb = new StringBuffer("");

//----注意这里，不能直接访问请求的URL，如果直接访问的话，会陷入死循环

URL url = new java.net.URL(reqTarget.toString()+"?type=11");

HttpURLConnection connection = (HttpURLConnection) url

.openConnection();

connection.setRequestProperty("User-Agent", "Mozilla/4.0");

connection.connect();

in = connection.getInputStream();

java.io.BufferedReader breader = new BufferedReader(

new InputStreamReader(in, "GBK"));

String currentLine;

FileOutputStream fos = new FileOutputStream(file);

while ((currentLine = breader.readLine()) != null) {

sb.append(currentLine);

fos.write(currentLine.getBytes());

}

if (null != breader)

breader.close();

if (null != fos)

fos.close();

//---------------转到与JSP对应的HTML页

response.sendRedirect(request.getContextPath()+"/"+name + ".html");

} catch (Exception e) {

e.printStackTrace();

}

}else{

//----------如果存在指定的HTML，直接跳转到指定的HTML页

response.sendRedirect(request.getContextPath()+"/"+name + ".html");

}

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

throws ServletException, IOException {

doGet(request, response);

}

public void init() throws ServletException {

// Put your code here

}

}

WEB.XML配置：

<?xml version="1.0" encoding="UTF-8"?>

<web-app version="2.4"

xmlns="http://java.sun.com/xml/ns/j2ee"

xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee

http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

<filter>

<filter-name>jspfilter</filter-name>

<filter-class>com.beanutil.JspFilter</filter-class>

</filter>

<filter-mapping>

<filter-name>jspfilter</filter-name>

<url-pattern>*.jsp</url-pattern>

</filter-mapping>

<servlet>

<servlet-name>conversion</servlet-name>

<servlet-class>com.beanutil.ConversionServlet </servlet-class>

</servlet>

<servlet-mapping>

<servlet-name>conversion</servlet-name>

<url-pattern>/conversion</url-pattern>

</servlet-mapping>

</web-app>