jsp生成html文件

从网上找到了两种方法都是大同小异，经过我整理了一下。
先将两种方法贴出来 尊重原作者，向其致敬
1.作者：仓木泽
为了减轻服务器压力，将原来的文章管理系统由JSP文件的从数据库中取数据显示改为由jsp生成静态html文件后直接访问html文件。下面是一个简单的示例

1.buildhtml.jsp

<%@ page contentType="text/html; charset=gb2312" import="java.util.*,java.io.*"%>
<%
try{
String title="jsp生成静态html文件";
String content="小样，还搞不定你？";
String editer="hpsoft";
String filePath = "";
filePath = request.getRealPath("/")+"template.htm";
out.print(filePath);
String templateContent="";
FileInputStream fileinputstream = new FileInputStream(filePath);//读取模块文件
int lenght = fileinputstream.available();
byte bytes[] = new byte[lenght];
fileinputstream.read(bytes);
fileinputstream.close();
templateContent = new String(bytes);
out.print(templateContent);
templateContent=templateContent.replaceAll("###title###",title);
templateContent=templateContent.replaceAll("###content###",content);
templateContent=templateContent.replaceAll("###author###",editer);//替换掉模块中相应的地方
out.print(templateContent);
// 根据时间得文件名
Calendar calendar = Calendar.getInstance();
String fileame = String.valueOf(calendar.getTimeInMillis()) +".html";
fileame = request.getRealPath("/")+fileame;//生成的html文件保存路径
FileOutputStream fileoutputstream = new FileOutputStream(fileame);//建立文件输出流
byte tag_bytes[] = templateContent.getBytes();
fileoutputstream.write(tag_bytes);
fileoutputstream.close();
}
catch(Exception e){
out.print(e.toString());
}

%>

模板文件

2. template.htm

 


 


 

###title###

作者：###author###

###content###

2. 作者 ：xxx(不好意思给忘了)

<%@ page contentType="text/html; charset=gb2312"%>
<%
String[] flag = {"<$title$>","<$date$>","<$author$>","<$content$>"};
String title=request.getParameter("title");
String content=request.getParameter("content");
String editer="admin";
//Session.getAttribute("s_userName");
String filePath = "";
filePath = application.getRealPath("./adminroot/news.template");
String templateContent;
try{
templateContent = ReadTemplates.getTlpContent(filePath);
}catch(Exception e){
throw new Exception("模板信息读取失败。请联系系统管理员。");
}
templateContent = ReplaceAll.replace(templateContent,flag[0],title);
templateContent = ReplaceAll.replace(templateContent,flag[1],GetDate.getStringDate());
templateContent = ReplaceAll.replace(templateContent,flag[2],editer);
templateContent = ReplaceAll.replace(templateContent,flag[3],content);

// 根据时间得文件名与路径名
Calendar calendar = Calendar.getInstance();
String fileName = String.valueOf(calendar.getTimeInMillis()) +".shtml";
String pathName = application.getRealPath("./news")+"\\"+ calendar.get(Calendar.YEAR) +
"\\"+ (calendar.get(Calendar.MONTH)+1) +"\\"+ calendar.get(Calendar.DAY_OF_MONTH)+"\\";
try{
WriteHtml.save(templateContent,pathName,fileName);
}catch(WriteFileException we){
throw new Exception("操作失败！");
}%>
import java.io.*;

public class WriteHtml {

  public WriteHtml() {
  }

  public static void save(String s, String s1, String s2)

  {
    try {
      a(s1);
      FileOutputStream fileoutputstream = new FileOutputStream(s1 + s2);
      byte abyte0[] = s.getBytes();
      fileoutputstream.write(abyte0);
      fileoutputstream.close();
    }
    catch (IOException e) {
      System.out.println( " write html error" +e.getMessage());
    }
  }

  private static void a(String s) {
    try {
      File file = new File(s);
      if (!file.exists())
        file.mkdirs();
    }
    catch (Exception e) {
      System.out.println( " mkdirs error!" +e.getMessage());
    }
  }
}
import java.io.*;
 public class  ReplaceAll
 {
  private static Object a = new Object();
  public ReplaceAll()
  {
  }

  public String replace(String content,String flag,String temp)
  {
   String str = null;

         try
         {
          //System.out.println("before-----"+content);
          String s1 = content;
             str = s1.replaceAll(flag,temp);
            // System.out.println("replace after-----"+str);
         }
         catch(Exception e)
         {
          System.out.println("replace all error:"+e.getMessage());
         }
         return str;

     }
     private static void a(String s)
     {
         File file = new File(s);
         if(!file.exists())
             file.mkdirs();
     }
 }

import java.io.*;
 import java.util.*;

 public class ReadTemplates
 {

     private String temp = null;
     private Object a = new Object();

     public ReadTemplates()
     {
     }

     public String getTlpContent(String s)

     {
         if(temp == null)
             synchronized(a)
             {
                 if(temp == null)
                     try
                     {
                         System.out.println("----------------------------");
                         temp = a(s);
                         //System.out.println("test the temp"+temp);
                     }
                     catch(Exception e)
                     {
                        System.out.println("get tlpconente error"+e.getMessage());
                     }
             }
         return temp;
     }

     private synchronized String a(String s)

     {
         String s1 = null;
         try
         {
             FileInputStream fileinputstream = new FileInputStream(s);
             int i = fileinputstream.available();
             byte abyte0[] = new byte[i];
             fileinputstream.read(abyte0);
             fileinputstream.close();
             s1 = new String(abyte0);
         }
         catch(IOException e)
         {
          System.out.println("ioexception error"+e.getMessage());
         }
         return s1;
     }

 }

<$title$>

作者：<$author$>  发布时间：<$date$>

<$content$>

下面是我整理的方法：
1.我使用了已有大部分程序，但借用了pathfile字段，将得到的路径分类的保存到系统路径下。
我写了一个bean已实现这个功能：
package com.binghe.publish.database;

import java.io.*;

public class JspToHtml {
  private String temp = "";
  private Object a = new Object();
  public JspToHtml() {
  }

  public String readTemple(String filepath) {

    if (temp == null) {
      synchronized (a) {
        System.out.println("---------------");
        try {
          FileInputStream fileinputstream = new FileInputStream(filepath);
          int i = fileinputstream.available();
          byte byte0[] = new byte[i];
          fileinputstream.read(byte0);
          fileinputstream.close();
          temp = new String(byte0);
        }
        catch (FileNotFoundException ex) {
          System.out.println("FileNotFoundException error" + ex.getMessage());
        }
        catch (IOException ex1) {
          System.out.println("IOException error" + ex1.getMessage());
        }
      }

    }
    return temp;
  }

  public String replaceAll(String content, String flag, String s) {
    String str = null;
    String s1 = content;
    try {
      str = s1.replaceAll(flag, s);
    }
    catch (Exception ex2) {
      System.out.println("Exception error" + ex2.getMessage());
    }
    return str;
  }

  public static void writeHtml(String content, String pathname, String filename) {
    File file = new File(pathname);
    if (!file.exists()) {
      file.mkdir();
    }
    try {
      FileOutputStream fileoutputstream = new FileOutputStream(pathname +
          filename);
      byte byte0[] = content.getBytes();

      fileoutputstream.close();

    }
    catch (FileNotFoundException ex) {
      System.out.println("FileNotFoundException error" + ex.getMessage());
    }
    catch (IOException ex1) {
      System.out.println("IOException error" + ex1.getMessage());
    }

  }

}