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当然，记得先要initdb.<br>
<br>
现在，我们开始测试servlet,jsp,以及jsp连接PostgreSQL<br>
<br>
４<br>
首先，我们先测试jsp,因为这个比较简单.<br>
#cd /usr/local/tomcat/webapps<br>
#mkdir -p myapp/WEB-INF 注意大小写<br>
#cp ROOT/WEB-INF/web.xml myapp/WEB-INF<br>
#vi myapp/index.jsp<br>
<html><body><br>
<%= new java.util.Date() %><br>
</body></html><br>
这样通过http://localhost:8080/myapp/index.jsp是不能访问的，还需要给tomcat增加一个context<br>
vi ../conf/server.xml<br>
查找< Context path=<br>
然后该段后面添上<Context path="/myapp" docBase="myapp" /><br>
重新启动tomcat,在浏览器中输入http://localhost:8080/myapp/index.jsp<br>
如果正常，那么恭喜您，这个也成功了<br>
<br>
其次，测试servlet<br>
先写一个最简单的servlet。<br>
package test;<br>
import java.io.*;<br>
import javax.servlet.*;<br>
import javax.servlet.http.*;<br>
public class Test extends HttpServlet {<br>
protected void doGet(HttpServletRequest request, HttpServletResponse response)<br>
throws ServletException, IOException {<br>
PrintWriter out=response.getWriter();<br>
out.println("<html><body><h1>This is a servlet test.</h1></body></html>");<br>
}<br>
}<br>
把上述文件存为Test.java,然后用javac进行编译，把产生的Test.class文件copy到/usr/local/tomcat/webapps/myapp/WEB-INF/classes/test/<br>
<br>
修改myapp/WEB-INF/web.xml，改后大概是这个样子<br>
<?xml version="1.0" encoding="ISO-8859-1"?><br>
<br>
<!DOCTYPE web-app<br>
PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"<br>
"http://java.sun.com/dtd/web-app_2_3.dtd"><br>
<web-app><br>
<description><br>
A application for test.<br>
</description><br>
<servlet><br>
<servlet-name>test</servlet-name><br>
<servlet-class>test.Test</servlet-class><br>
</servlet><br>
<servlet-mapping><br>
<servlet-name>test</servlet-name><br>
<url-pattern>/Test</url-pattern><br>
</servlet-mapping><br>
</web-app><br>
重新启动tomcat4,打开浏览器输入http://localhost:8080/myapp/Test,应该是显示This is a servlet test.<br>
若出现错误，400错误，表示没找到文件，应该是server.xml中没写Context,如果是500错误，那么是程序有问题：）<br>
其他错误请自行解决。<br>
<br>
5 连接数据库<br>
这个需要postgresql的jdbc,我们开始rpm -ivh post*.rpm的时候，已经都安装了，使用rpm -qa | grep post<br>
找出该jdbc的包的名称<br>
ostgresql-7.4.1-1PGDG<br>
postgresql-jdbc-7.4.1-1PGDG<br>
postgresql-libs-7.4.1-1PGDG<br>
<br>
找它的路径.<br>
#rpm -ql postgresql-jdbc-7.4.1-1PGDG<br>
发现在/usr/share/pgsql/中，文件列表如下：<br>
/usr/share/pgsql/pg74.1jdbc1.jar<br>
/usr/share/pgsql/pg74.1jdbc2.jar<br>
/usr/share/pgsql/pg74.1jdbc2ee.jar<br>
/usr/share/pgsql/pg74.1jdbc3.jar<br>
<br>
这个jdbcX.jar表示分别对应与jdbc版本，我使jdbc2.0,于是这么做<br>
#cp pg74.1jdbc2.jar pg74.1jdbc2.jar.bak<br>
#mv pg74.1jdbc2.jar postgresql.jar<br>
把该postgresql.jar放到/usr/java/jdk/jre/lib/ext/中，也可以添加到CLASSPATH中。<br>
写一个简单的jsp脚本进行测试连接数据库<br>
pgsql.jsp<br>
<%@ page contentType="text/html;charset=gb2312"%><br>
<%@ page import="java.sql.*"%><br>
<html><br>
<body><br>
<%<br>
Class.forName("org.postgresql.Driver").newInstance();<br>
String url ="jdbc:postgresql://127.0.0.1:5432/postgres" ; /postgres为该server上的db<br>
String user="postgres"; 数据库用户<br>
String password="YourPass"; 该用户密码<br>
Connection conn= DriverManager.getConnection(url,user,password);<br>
Statement stmt=conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);<br>
String sql="select * from weather"; 我的数据库中有个表是weather,您也可以使用自己创建的表<br>
ResultSet rs=stmt.executeQuery(sql);<br>
while(rs.next()) {%><br>
您的第一个字段内容为：<%=rs.getString(1)%><br>
您的第二个字段内容为：<%=rs.getString(2)%><br>
<%}%><br>
<%out.print("数据库操作成功，恭喜你");%><br>
<%rs.close();<br>
stmt.close();<br>
conn.close();<br>
%><br>
</body><br>
</html><br>
<br>
把这个文件存到myapp/下，然后http://localhost:8080/myapp/pgsql.jsp，应该是没有问题，我都测试通过。<br>
<br>
恭喜您，简单的一个开发环境搭建完毕 。<br>
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