Java Web 网络留言板2 JDBC数据源（连接池技术）

Hongten

发布于 2018-09-13 17:30:04

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文章被收录于专栏：HongtenHongten

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addMessage.htm

代码；

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript" src="/guestbook2/js/validation-framework.js"></script>
<script type="text/javascript" src="/guestbook2/fckeditor/fckeditor.js"></script>
<title>add message</title>
</head>
<body>
 <p align="center">请您输入留言</p>
  <p align="center"><a href="/guestbook2/servlet/getMessages">查看留言</a></p>
<form id="form1" name="form1" method="post" action="/guestbook2/servlet/addMessage" onsubmit="return doValidate(this)"> 
  <table width="600" height="400" border="0" align="center">
    <tr>
      <td width="100">姓名：</td>
      <td width="500">
        <input name="name" type="text" id="name" size="40" maxlength="20" />
      </td>
    </tr>
    <tr>
      <td>E-Mail：</td>
      <td>
        <input name="email" type="text" id="email" size="40" maxlength="40" />
      </td>
    </tr>
    <tr>
      <td>电话：</td>
      <td>
        <input name="phone" type="text" id="phone" size="40" maxlength="20" />
      </td>
    </tr>
    <tr>
      <td>主题：</td>
      <td>
        <input name="title" type="text" id="title" size="80" maxlength="80" />
      </td>
    </tr>
    <tr>
      <td valign="top">内容：</td>
      <td>
        <script type="text/javascript">
            var oFCKeditor = new FCKeditor("content");    
            oFCKeditor.BasePath    = '/guestbook2/fckeditor/' ;
            oFCKeditor.Height    = 300 ;
            oFCKeditor.ToolbarSet = 'Basic';
            oFCKeditor.Create() ;
        </script>
    </td>
    </tr>
    <tr>
      <td></td>
      <td>
         <input type="submit" name="Submit" value="提交" />
         <input type="reset" name="Reset" value="重置" /> 
      </td>
    </tr>   
  </table>
</form>
</body>
</html>

StringUtil.java

代码：

package webbook.util;

public class StringUtil {

    /**
     * 判断输入的字符串参数是否为空。
     * @param args 输入的字串
     * @return true/false
     */
    public static boolean validateNull(String args) {
        if (args == null || args.length() == 0) {
            return true;
        } else {
            return false;
        }
    }

    /**
     * 判断输入的字符串参数是否为空或者是"null"字符,如果是,就返回target参数,如果不是,就返回source参数。
     */
    public static String chanageNull(String source, String target) {
        if (source == null || source.length() == 0 || source.equalsIgnoreCase("null")) {
            return target;
        } else {
            return source;
        }
    }

    /**
     * 过滤<, >,\n 字符的方法。
     * @param input 需要过滤的字符
     * @return 完成过滤以后的字符串
     */
    public static String filterHtml(String input) {
        if (input == null) {
            return null;
        }
        if (input.length() == 0) {
            return input;
        }
        input = input.replaceAll("&", "&amp;");
        input = input.replaceAll("<", "&lt;");
        input = input.replaceAll(">", "&gt;");
        input = input.replaceAll(" ", "&nbsp;");
        input = input.replaceAll("'", "&#39;");
        input = input.replaceAll("\"", "&quot;");
        return input.replaceAll("\n", "<br>");
    }
}

AddMessageServlet.java

代码：

package webbook.guestbook;
import java.io.*;
import java.sql.*;
import javax.naming.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.DataSource;
import java.text.SimpleDateFormat;
import webbook.util.StringUtil;

public class AddMessageServlet extends HttpServlet {
    private static final long serialVersionUID = -8349454122547148005L;

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String sql = "insert into guestbook (id,name,email,phone,title,content,time) values(gb_seq.nextval,?,?,?,?,?,?)";
        int result = 0;
        Connection conn = null;
        request.setCharacterEncoding("utf-8");
        String name = request.getParameter("name");
        String title = request.getParameter("title");
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head><title>guestbook input page</title></head>");
        out.println("<body>");

        if (StringUtil.validateNull(name)) {
            out.println("对不起，姓名不能为空，请您重新输入！<br>");
            out.println("<a href=\"" + request.getContextPath() + "/addMessage.htm\">添加新的留言</a><br>");
        } else if (StringUtil.validateNull(title)) {
            out.println("对不起，主题不能为空，请您重新输入！<br>");
            out.println("<a href=\"" + request.getContextPath() + "/addMessage.htm\">添加新的留言</a><br>");
        } else {
            try {
                Context context = new InitialContext();
                DataSource ds = (DataSource) context.lookup("java:/comp/env/jdbc/oracleds");
                conn = ds.getConnection();
                PreparedStatement pstmt = conn.prepareStatement(sql);
                pstmt.setString(1, StringUtil.filterHtml(name));
                pstmt.setString(2, StringUtil.filterHtml(request.getParameter("email")));
                pstmt.setString(3, StringUtil.filterHtml(request.getParameter("phone")));
                pstmt.setString(4, StringUtil.filterHtml(title));
                pstmt.setString(5, request.getParameter("content"));
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
                pstmt.setString(6, sdf.format(new java.util.Date()));
                result = pstmt.executeUpdate();
                pstmt.close();
            } catch (NamingException e) {
                e.printStackTrace();
            } catch (SQLException e) {
                e.printStackTrace();
            } finally {
                try {
                    conn.close();
                } catch (SQLException e) {
                    e.printStackTrace();
                }
            }
            if (result == 0) {
                out.println("对不起，添加留言不成功，请您重新输入！<br>");
                out.println("<a href=\"" + request.getContextPath() + "/addMessage.htm\">添加新的留言</a><br>");
            } else {
                out.println("祝贺您，成功添加留言。<br>");
                out.println("<a href=\"" + request.getContextPath() + "/servlet/getMessages\">查看所有留言内容</a><br>");
            }
            out.println("</body>");
            out.println("</html>");
            out.flush();
            out.close();
        }
    }
}

GetMessageServlet.java

代码；

package webbook.guestbook;

import java.io.*;
import java.sql.*;
import javax.naming.*;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.sql.DataSource;
import webbook.util.StringUtil;

public class GetMessagesServlet extends HttpServlet {

    private static final long serialVersionUID = 5964428201228635704L;

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        String sql = "select * from guestbook order by id desc";
        Connection conn = null;
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        out.println("<html>");
        out.println("<head><title>display messages</title></head>");
        out.println("<style>");
        out.println("*{font-family:\"宋体\";font-size:14px}");
        out.println("</style>");
        out.println("<body><center>");
        out.println("<a href=\""+request.getContextPath()+"/addMessage.htm\">添加新的留言内容</a><br>");
        out.println("留言内容<br><br>");
        try {
            Context initContext = new InitialContext();
            DataSource ds = (DataSource) initContext.lookup("java:/comp/env/jdbc/oracleds");
            conn = ds.getConnection();            
            PreparedStatement pstmt = conn.prepareStatement(sql);
            ResultSet rs = pstmt.executeQuery();
            while (rs.next()) {
                this.printRow(out, rs);
            }
            rs.close();
            pstmt.close();
        } catch (NamingException e) {
            e.printStackTrace();
        } catch (SQLException e) {
            e.printStackTrace();
        } finally {
            try {
                conn.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        out.println("</center></body>");
        out.println("</html>");
        out.flush();
        out.close();
    }

    private void printRow(PrintWriter out, ResultSet rs) throws SQLException {
        out.println("<table width=\"600\"  border=\"1\"  bordercolor=\"000000\" style=\"table-layout:fixed;word-break:break-all\">");
        out.println("<tr><td width=\"50\" bordercolor=\"ffffff\">编号:</td>");
        out.println("<td width=\"550\"  bordercolor=\"ffffff\" >" + rs.getInt("id") + "</td></tr>");
        out.println("<tr><td bordercolor=\"ffffff\">姓名:</td><td bordercolor=\"ffffff\" >" + rs.getString("name") + "</td></tr>");
        out.println("<tr><td bordercolor=\"ffffff\">电话:</td><td  bordercolor=\"ffffff\" >" + StringUtil.chanageNull(rs.getString("phone"), "没填")
                + "</td></tr>");
        out.println("<tr><td bordercolor=\"ffffff\">email:</td><td  bordercolor=\"ffffff\" >" + StringUtil.chanageNull(rs.getString("email"), "没填")
                + "</td></tr>");
        out.println("<tr><td valign=\"top\" bordercolor=\"fffff\">主题:</td><td  bordercolor=\"ffffff\" >" + rs.getString("title") + " </td></tr>");
        out.println("<tr><td valign=\"top\" bordercolor=\"fffff\">内容:</td>");
        out.println("<td bordercolor=\"fffff\" align=\"left\" bordercolor=\"ffffff\" >" + StringUtil.chanageNull(rs.getString("content"), "没填")
                + "</td></tr>");
        out.println("<tr><td bordercolor=\"ffffff\">时间:</td><td  bordercolor=\"ffffff\" >" + rs.getString("time") + " </td></tr>");
        out.println("</table><br>");
    }
}

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原始发表：2011-07-22 ，如有侵权请联系 cloudcommunity@tencent.com 删除

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Java Web 网络留言板2 JDBC数据源（连接池技术）

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