练习&复习

一、Tomatcat数据源的配置

　　1,配置server.xml。

 1 <Context path="/web" docBase="E:\webstudy" reloadable="true" debug="0"> 2                 <Resource name="jdbc/study" 3                     auth="Container" 4                     type="javax.sql.DataSource" 5                     maxActive="100" 6                     maxIdle="30" 7                     maxWait="10000" 8                     username="root" 9                     password="mysqladmin"10                     driverClassName="org.gjt.mm.mysql.Driver"11                     url="jdbc:mysql://localhost:3306/study_java"/>                    12             </Context>

　　2,配置项目目录下的web.xml

<resource-ref>        <res-ref-name>jdbc/study</res-ref-name>        <res-type>javax.sql.DataSource</res-type>        <res-auth>Container</res-auth>        </resource-ref>

　　3,重启Tomcat服务器，编写测试练习

　　　　　a:编写Servlet。DataSourceTest.java

 1 package org.xiong.tomcat.datasource; 2 import java.util.List; 3 import java.util.ArrayList; 4 import java.util.Date; 5 import java.io.IOException; 6 import java.sql.Connection; 7 import java.sql.DriverManager; 8 import java.sql.PreparedStatement; 9 import java.sql.ResultSet;10 11 import javax.naming.Context;12 import javax.naming.InitialContext;13 import javax.sql.DataSource;14 15 import javax.servlet.ServletException;16 import javax.servlet.http.HttpServlet;17 import javax.servlet.http.HttpServletRequest;18 import javax.servlet.http.HttpServletResponse;19 20 import org.xiong.demo.vo.BookInfo;21 22 public class DataSourceTest extends HttpServlet23 {24     public static  final String DATASOURCE_NAME="java:comp/env/jdbc/study";25     26     public void doGet(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException27     {28         this.doPost(req,resp);29         30     }31     public void doPost(HttpServletRequest req,HttpServletResponse resp) throws ServletException,IOException32     {33         List<BookInfo> listBook=new ArrayList<BookInfo>();                34         Connection conn=null;35         PreparedStatement psmt=null;        36         String sql="select book_id,book_name,book_author,book_publishers,book_price,book_shelves_date from BookInfo";37         try38         {39             Context cxt=new InitialContext();40             DataSource ds=(DataSource)cxt.lookup(DATASOURCE_NAME);41             conn=ds.getConnection();        42             psmt=conn.prepareStatement(sql);43             ResultSet rst=psmt.executeQuery();44             while(rst.next())45             {46                 BookInfo book=new BookInfo();47                 book.setBook_id(rst.getInt(1));;48                 book.setBook_name(rst.getString(2));49                 book.setBook_author(rst.getString(3));50                 book.setBook_publishers(rst.getString(4));51                 book.setBook_price(rst.getFloat(5));52                 book.setBook_shelves_date(new Date(rst.getDate(6).getTime()));53                 listBook.add(book);        54             }55         }56         catch(Exception ex)57         {58             ex.printStackTrace();59         }60         finally61         {62             try63             {64                 65                 conn.close();66             }67             catch(Exception ex)68             {69                 ex.printStackTrace();70             }71         }        72         req.setAttribute("list",listBook);73         req.getRequestDispatcher("DataSourceTest1.jsp").forward(req,resp);74     }75 }

　　　　　b:编写输出页面

　

 1 <%@ page contentType="text/html" pageEncoding="GBK"%> 2 <%@ page import="java.util.*"%> 3  4 <center> 5     <table border="1" width="80%"> 6         <tr> 7             <th>图书编号</th> 8             <th>图书名称</th> 9             <th>作&nbsp;&nbsp;&nbsp;&nbsp;者</th>10             <th>出&nbsp;版&nbsp;社</th>11             <th>定&nbsp;&nbsp;&nbsp;&nbsp;价</th>12             <th>上架日期</th>13         </tr>14 <%15     List lst=(List)request.getAttribute("list");16     Iterator iter=lst.iterator();17 while(iter.hasNext())18     {19         pageContext.setAttribute("book",iter.next());20 %>21     <tr>22         <td>${book.book_id}</td>23         <td>${book.book_name}</td>24         <td>${book.book_author}</td>25         <td>${book.book_publishers}</td>26         <td>${book.book_price}</td>27         <td>${book.book_shelves_date}</td>28     </tr>29 <%30     }31 %>        32     </table>33 </center>

　　　　   c:配置servlet

1 <servlet>2         <servlet-name>datasource</servlet-name>3         <servlet-class>org.xiong.tomcat.datasource.DataSourceTest</servlet-class>4     </servlet>5     <servlet-mapping>6         <servlet-name>datasource</servlet-name>7         <url-pattern>/datasource_demo/DataSourceTest</url-pattern>        8     </servlet-mapping>

 

二，Filter练习，通过过滤器设置编码格式

　　1,编写setCharachterEncode.java

 1 package org.xiong.demo.filtertest; 2  3 import java.io.IOException; 4 import javax.servlet.ServletException; 5 import javax.servlet.ServletRequest; 6 import javax.servlet.ServletResponse; 7 import javax.servlet.Filter; 8 import javax.servlet.FilterConfig; 9 import javax.servlet.FilterChain;10 import javax.servlet.http.HttpServlet;11 12 public class SetCharacterEncode implements Filter13 {14     private String str=null;15     public void init(FilterConfig filterConfig) throws ServletException16     {17             str=filterConfig.getInitParameter("ref");18     }19     public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws IOException,ServletException20     {21         request.setCharacterEncoding(str);22         chain.doFilter(request,response);23     }24     public void destroy()25     {26         27     }28 }

　　2,配置Filter

 1 <filter> 2    <filter-name>SetEncoding</filter-name> 3     <filter-class>org.xiong.demo.filtertest.SetCharacterEncode</filter-class> 4    <init-param> 5     <param-name>ref</param-name> 6     <param-value>GBK</param-value> 7    </init-param> 8 </filter> 9 <filter-mapping>10    <filter-name>SetEncoding</filter-name>11    <url-pattern>/bookdemo/*</url-pattern>12 </filter-mapping>

来源：https://www.cnblogs.com/xiongyu/archive/2012/02/02/2336213.html