jsp可以在html上打开嘛?

jsp不可以在html上打开。只能把html代码嵌套在jsp中，且文件的扩展名是.jsp。因把jsp嵌套在html中，html文件在浏览器中，只能显示html的代码，而jsp代码只能显示原型。

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>

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