spagobi 引擎调用，跨web应用访问，filter的使用

一、前言
spagobi的引擎都是模块方式加载的，引擎就是一个web app，比如SpagoBITalendEngine。spagobi门户传递一个document id给talend engine应用，在filter层初始化session，在业务servlet，即对外开放的服务访问点，从request session获取相关信息，并execute talend job。

本文根据以上应用，来作一个简化的模型：

1、两个web app，其中一个访问另一个的servelt

2、servlet在执行前，在filter类里初始化session，仅是设置一个attribute。（处理结果写入log日志）

3、在servlet里取到attribute，并返回到页面。（处理结果写入log日志）

附：未模拟单点登录。

二、环境准备

tool: eclipse 3.6 + wtp

jvm: j2sdk 1.6

web: tomcat 6.0

三、开发

（1）创建两个“dynamic web project”

名称分别为：biweb（主调web app）和biwebengine（被调web app），当然你要先配置好它的web server为tomcat

（2）开发biwebengine

－创建类filters.AccessFilter

package filters;

import java.io.IOException;

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 org.apache.log4j.Logger;

public class AccessFilter implements Filter {
    public final String DOCUMENT_ID_PARAM_NAME = "document";
    private static transient Logger logger = Logger
            .getLogger(AccessFilter.class);

    @Override
    public void destroy() {
        // TODO Auto-generated method stub
    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response,
            FilterChain chain) throws IOException, ServletException {
        String documentId;
        documentId = (String) request.getParameter(DOCUMENT_ID_PARAM_NAME);
        logger.info("Filter documentId from request: " + documentId);
       
        if (request instanceof HttpServletRequest) {
            ((HttpServletRequest) request).getSession().setAttribute(DOCUMENT_ID_PARAM_NAME, documentId);
        }
        chain.doFilter(request, response); //for other filters
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub
    }

}

－servlet类de.daniel.RunService

package de.daniel;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.log4j.Logger;

public class RunService extends HttpServlet{
    private static final long serialVersionUID = 1L;
    private static transient Logger logger = Logger.getLogger(RunService.class);
    public final String DOCUMENT_ID_PARAM_NAME = "document";
 
    @Override
    protected void service(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
       
        String documentId  = String.valueOf(request.getSession().getAttribute(DOCUMENT_ID_PARAM_NAME));
        logger.info("RunService has gotten attribute from session: " + documentId);
       
        // setup response header
        if(response instanceof HttpServletResponse) {
            ((HttpServletResponse)response).setHeader("Content-Disposition", "inline;filename=\"service-response\";");
        }
       
        String content = "invoked sucessfully! " + DOCUMENT_ID_PARAM_NAME + " is: " + documentId;
       
        response.setContentType("text/plain");
        response.setContentLength( content.length() );
       
        if(response instanceof HttpServletResponse) {
            ((HttpServletResponse)response).setStatus(200);
        }
       
        response.getWriter().print(content);
        response.getWriter().flush();
    }

    @Override
    public void init() throws ServletException {
        super.init();
    }

}

－log4j日志配置log4j.properties

日志将被保存到tomcat/logs下的biwebengine.log文件

log4j.rootLogger=INFO, biwebengine

# SpagoBI Appender
log4j.appender.biwebengine=org.apache.log4j.RollingFileAppender
log4j.appender.biwebengine.File=${catalina.base}/logs/biwebengine.log
log4j.appender.biwebengine.MaxFileSize=10000KB
log4j.appender.biwebengine.MaxBackupIndex=0
log4j.appender.biwebengine.layout=org.apache.log4j.PatternLayout
log4j.appender.biwebengine.layout.ConversionPattern=%d{DATE} %5p %c.%M:%L - %m%n

－web.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<web-app>
  <display-name>biwebengine</display-name>
  <filter>
　　<filter-name>Run Service Filter</filter-name>
　　<filter-class>filters.AccessFilter</filter-class>
　　<init-param>
　　　　<param-name>encoding</param-name>
　　　　<param-value>GBK</param-value>
　　</init-param>
    </filter>

    <filter-mapping>
    　　<filter-name>Run Service Filter</filter-name>
    　　<url-pattern>/RunService/*</url-pattern>
    </filter-mapping>

    <servlet>
            <servlet-name>RunService</servlet-name>
            <servlet-class>de.daniel.RunService</servlet-class>
        </servlet>
    <servlet-mapping>
        <servlet-name>RunService</servlet-name>
        <url-pattern>/RunService</url-pattern>
    </servlet-mapping>
</web-app>

（3）开发biweb

只要写一个首页index.jsp就可以了，其它也不用配置：

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd ">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
    <form name="form1" method="post" action="../biwebengine/RunService?document=11">
        <input type="submit" value="access biwebengine"/>
    </form>
</body>
</html>

四、验证

右击工程，run as -> run on  server，访问：http://localhost:8080/biweb/ ，如下图：

点击按钮，跳转到另一个web：

可以看看日志文件里的内容。

评论

1 楼 qwertyxl 2012-11-11  

你好，我最近在做关于SpagoBI相关的项目，请问你对这方面了解么，我有些问题想请教下