動態(tài)JSP頁生成靜態(tài)HTML的方法

2024-09-05 00:22:18

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這篇文章主要介紹了動態(tài)JSP頁生成靜態(tài)HTML的方法,以實例形式較為詳細(xì)的分析了JSP生成靜態(tài)HTML頁面的相關(guān)技巧,具有一定參考借鑒價值,需要的朋友可以參考下

本文實例講述了動態(tài)JSP頁生成靜態(tài)HTML的方法。分享給大家供大家參考。具體如下：

具體實現(xiàn)：

利用Filter的過濾功能把*.jsp過濾出來，判斷是否存在對應(yīng)的.html文件，如果不存在對應(yīng)的.html文件，則將其內(nèi)容讀出寫入指定的.html文件，再跳轉(zhuǎn)到對應(yīng)的.html即可。如果存在對應(yīng)的.html文件，則直接跳轉(zhuǎn)到對應(yīng)的.html即可。

代碼：

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 自動生成方法存根

}

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 自動生成方法存根

}

}

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();

//----獲取請求的URL

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

//----指定對應(yīng)JSP的HTML名稱

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

//---判斷是否存在對應(yīng)的HTML文件

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

if (!file.exists()) { //--------如果不存在對應(yīng)的HTML文件

try {

file.createNewFile(); //--------創(chuàng)建HTML文件

//-------將JSP的內(nèi)容寫入對應(yīng)的HTML文件內(nèi)

InputStream in;

StringBuffer sb = new StringBuffer("");

//----注意這里，不能直接訪問請求的URL，如果直接訪問的話，會陷入死循環(huán)

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();

//---------------轉(zhuǎn)到與JSP對應(yīng)的HTML頁

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

} catch (Exception e) {

e.printStackTrace();

}

}else{

//----------如果存在指定的HTML，直接跳轉(zhuǎn)到指定的HTML頁

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>