Java中在Jsp页面中生成html文件的方法

2017-04-23 16:41 阅读 927 次 评论 0 条

方法1

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方法

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

<html>

<head>

<title>###title###</title>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312">

<LINK href="../css.css" rel=stylesheet type=text/css>

</head>

<body>

<table width="500" border="0" align="center" cellpadding="0" cellspacing="2">

<tr>

<td align="center">###title###</td>

</tr>

<tr>

<td align="center">作者:###author### </td>

</tr>

<tr>

<td>###content###

</td>

</tr>

</table>

</body>

</html>

 

方法2

<%@ 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(&quot;before-----&quot;+content);

String s1 = content;

str = s1.replaceAll(flag,temp);

// System.out.println(&quot;replace after-----&quot;+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(&quot;test the temp&quot;+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;

}

}

 

<html>

<head>

<title>Untitled Document</title>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312">

<LINK href="../css.css" rel=stylesheet type=text/css>

</head>

<body>

<table width="500" border="0" align="center" cellpadding="0" cellspacing="2">

<tr>

<td align="center"><$title$></td>

</tr>

<tr>

<td align="center">作者:<$author$>  发布时间:<font color=#ff0000><$date$></font></td>

</tr>

<tr>

<td><$content$>

</td>

</tr>

</table>

</body>

</html>

 

方法3

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());

}

}

}

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