我们在网站项目中为了提高网站访问速度我们都会吧JSP的动态页面变成静态页面，那么你知道动态JSP页怎么生成静态HTML吗？下面我们就去看看动态JSP页生成静态HTML的方法。
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>
这篇文章主要介绍了动态JSP页怎么生成静态HTML的内容，小编在这里详细分析了JSP生成静态HTML页面的相关技巧，希望对你们有一定的帮助。