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java静态页面生成技术-批量数据生成

2010-10-31 11:37 204 查看

前言:一直都在寻找java模式下静态页面的生成方法,终于上到了新的台阶了,批量数据生成初步实现,呵呵

前置条件:运行环境(Struts2.16以上+Hibernate3.5以上,这是我的运行环境,未必按照这个,根据实际需求定制)

实现原理:使用Struts2的action运行两次数据查询存入结果集,同时替换指定模板页中的对应字符,生成静态页面,实现静态生成

具体看代码

1.核心代码(使用注解模式操作):

package com.marry.action;

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.servlet.http.HttpServletRequest;
import org.apache.struts2.ServletActionContext;
import org.apache.struts2.convention.annotation.Action;
import org.apache.struts2.convention.annotation.Result;
import org.hibernate.Query;
import org.hibernate.Session;

import com.opensymphony.xwork2.ActionSupport;
import com.marry.model.*;
import com.marry.tools.HibernateUtil;

public class GetAllListAction extends ActionSupport {
private HttpServletRequest req;
private NewsBean nwBean;
private YhmsgBean yhmBean;
private Query qy;
private int x = 1;
public List<NewsBean> nwlist = new ArrayList<NewsBean>();
public List<YhmsgBean> yhmlist = new ArrayList<YhmsgBean>();
private Session session = HibernateUtil.getSessionFactory()
.getCurrentSession();

public NewsBean getNwBean() {
return nwBean;
}

public void setNwBean(NewsBean nwBean) {
this.nwBean = nwBean;
}

public YhmsgBean getYhmBean() {
return yhmBean;
}

public void setYhmBean(YhmsgBean yhmBean) {
this.yhmBean = yhmBean;
}

@Action(value = "cretp", results = { @Result(name = "getok", location = "2.jsp") })
public String doList() throws Exception {
req = ServletActionContext.getRequest();
String fpath = req.getRealPath("/");//获得服务器绝对路径

String templateContent = null;

/*读取模板文件*/
FileInputStream fileinputstream = new FileInputStream(fpath + "p.html");
int lenght = fileinputstream.available();
byte bytes[] = new byte[lenght];

StringBuffer sb = new StringBuffer();

/*字符转码,防止出现乱码*/
while (fileinputstream.read(bytes) != -1) {
sb.append(new String(bytes, "GBK"));
}

fileinputstream.close();
templateContent = new String(bytes);

/*准备数据库读取操作*/
session.beginTransaction();

/*第一个结果集读取*/
qy = session.createQuery("from NewsBean");
nwlist = qy.list();

/*循环结果集,将指定字段替换模板中对应的位置*/
for (Iterator<NewsBean> iterator = nwlist.iterator(); iterator
.hasNext();) {
NewsBean nwb = iterator.next();
templateContent = templateContent.replaceAll("##d1" + x + "#", nwb
.getNwid()
+ "");

templateContent = templateContent.replaceAll("##t1" + x + "#", nwb
.getNwtitle());
x++;
}

x=1;//还原初始,否则下一个输出会从当前x的值开始取值

/*第二个结果集查询开始*/
qy = session.createQuery("from YhmsgBean");
yhmlist = qy.list();

for (Iterator<YhmsgBean> iterator = yhmlist.iterator(); iterator
.hasNext();) {
YhmsgBean yhm = iterator.next();
templateContent = templateContent.replaceAll("##d2" + x + "#", yhm
.getYhmsgid()
+ "");

templateContent = templateContent.replaceAll("##t2" + x + "#", yhm
.getYhmsgtitle());
x++;
}

/* 输出静态页面 */
FileOutputStream fileoutputstream = new FileOutputStream(fpath
+ "sp.html");
byte tag_bytes[] = templateContent.getBytes();
fileoutputstream.write(tag_bytes);
fileoutputstream.close();

session.getTransaction().commit();

return "getok";

}

}

2.模板页代码:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=GBK" />
<title>无标题文</title>
</head>

<body>
<table width="200px" border="1">
<tr>
<td>
A表ID
</td>
<td>
A表标题
</td>
</tr>
<tr>
<td>
##d11#
</td>
<td>
##t11#
</td>
</tr>
<tr>
<td>
##d12#
</td>
<td>
##t12#
</td>
</tr>
<tr>
<td>
##d13#
</td>
<td>
##t13#
</td>
</tr>
<tr>
<td>
##d14#
</td>
<td>
##t14#
</td>
</tr>
<tr>
<td>
##d15#
</td>
<td>
##t15#
</td>
</tr>
</table>
<table width="200px" border="1">
<tr>
<td>
B表ID
</td>
<td>
B表标题
</td>
</tr>
<tr>
<td>
##d21#
</td>
<td>
##t21#
</td>
</tr>
<tr>
<td>
##d22#
</td>
<td>
##t22#
</td>
</tr>
<tr>
<td>
##d23#
</td>
<td>
##t23#
</td>
</tr>
<tr>
<td>
##d24#
</td>
<td>
##t24#
</td>
</tr>
<tr>
<td>
##d25#
</td>
<td>
##t25#
</td>
</tr>
</table>
</body>
</html>

3.使用方法:

http://localhost:8080/项目名称/cretp

后记:

当前还有些bug,但不影响运行

bug:字符转码问题,模板页必须设为GBK编码,UTF-8会出现中文乱码

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