tomcat apache 实现负载平衡的小demo

　　软件：1个apache，2个tomcat

module包：mod_jk.so（下载地址：http://tomcat.apache.org/download-connectors.cgi）

下载文件解压即可得到mod_jk.so 并放置到apache/module下

　　　　apache/conf/http.cnf

LoadModule jk_module modules/mod_jk.so
JkWorkersFile conf/workers.properties
JkLogFile logs/mod_jk.log
JkLogLevel debug
JkMount /*.jsp loadbalancer 
#JkMount /j2eeTest/* loadbalancer

　　　　conf文件夹下新加workers.properties文件

worker.list = worker1,worker2,loadbalancer
worker.worker1.port = 8109
worker.worker1.host = localhost
worker.worker1.type = ajp13
worker.worker1.lbfactor = 300

worker.worker2.port = 8009
worker.worker2.host = localhost
worker.worker2.type = ajp13
worker.worker2.lbfactor = 100

worker.loadbalancer.type = lb
worker.loadbalancer.balanced_workers = worker1,worker2
worker.loadbalancer.sticky_session=false
worker.loadbalancer.sticky_session_force = false

　　　　　由于本地测试，tomcat端口不能重复一个tomcat的8080改成别的

端口有改动的主要文件配置conf/server.xml（80相关端口号全部改成81）

<Server port="8105" shutdown="SHUTDOWN">
<Connector port="8180" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" />
<Connector port="8109" protocol="AJP/1.3" redirectPort="8443" />
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker1">

端口不需要改动的（80）conf/server.xml

<Server port="8005" shutdown="SHUTDOWN">
<Connector port="8080" protocol="HTTP/1.1" 
               connectionTimeout="20000" 
               redirectPort="8443" />
<Connector port="8009" protocol="AJP/1.3" redirectPort="8443" />
<Engine name="Catalina" defaultHost="localhost" jvmRoute="worker2">

测试：新建一个web项目

　　j2eeTest 测试jsp

<%@ 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">
<% System.out.println("1111");%>
<title>Insert title here</title>
</head>
<body>
    <b>Hello : <%=request.getAttribute("User") %></b>
</body>
</html>

　　连续刷新12次，查看输出结果为3：1