⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 browseservlet.java

📁 java结合ajax编写的简易留言本
💻 JAVA
字号:
🔍 
package anni.gbook.ajax;

import java.io.IOException;
import java.io.PrintWriter;

import java.util.logging.Logger;

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

import anni.gbook.BoardInfo;
import anni.gbook.FileDAO;
import anni.gbook.IBoardDAO;


/**
 * 浏览所有留言.
 * @author Lingo
 * @version 1.0
 * @since 2006-01-19
 */
public class BrowseServlet extends HttpServlet {
    /**
     * 日志.
     */
    private Logger log = Logger.getLogger(BrowseServlet.class.getName());

    /**
     * dao接口.
     */
    private IBoardDAO dao;

    /**
     * 初始化dao.
     * @param config 配置
     * @throws ServletException servlet异常
     */
    public final void init(final ServletConfig config)
        throws ServletException {
        super.init(config);
        dao = FileDAO.getInstance();
    }

    /**
     * 销毁servlet.
     */
    public final void destroy() {
        super.destroy();
        dao = null;
    }

    /**
     * 处理get请求.
     * @param request 请求
     * @param response 响应
     * @throws ServletException servlet异常
     * @throws IOException io异常
     */
    protected final void doGet(final HttpServletRequest request,
        final HttpServletResponse response)
        throws ServletException, IOException {
        log.info("start");

        //
        StringBuffer buff = new StringBuffer();
        response.setContentType("text/xml");
        response.setCharacterEncoding("GBK");

        PrintWriter out = response.getWriter();
        buff.append("<?xml version=\"1.0\" encoding=\"GBK\"?>")
            .append("<constants>");

        String id0 = request.getParameter("id");
        int id = 0;

        try {
            id = Integer.parseInt(id0);
        } catch (NumberFormatException ex) {
            System.out.println("输入的id不是一个数字：" + ex.getMessage());
            buff.append("<err>").append("ID错误").append("</err>")
                .append("</constants>");
            out.print(buff.toString());

            return;
        }

        //
        BoardInfo info = dao.findById(id);

        if (info == null) {
            System.out.println("找不到指定id的留言：" + id);
            buff.append("<err>").append("找不到指定id的留言").append("</err>")
                .append("</constants>");
            out.print(buff.toString());

            return;
        }

        String reply = info.getReply();
        int html = 0;

        if (reply.indexOf("<") != -1) {
            html = 1;
        }

        reply = reply.replaceAll("<", "&lt;");
        reply = reply.replaceAll(">", "&gt;");

        buff.append("<title>").append(Constants.TITLE).append("</title>")
            .append("<copyright>").append(Constants.COPYRIGHT)
            .append("</copyright>").append("<id>").append(id)
            .append("</id>").append("<reply>").append(reply)
            .append("</reply>").append("<html>").append(html)
            .append("</html>").append("</constants>");

        out.print(buff.toString());

        log.info("end");
    }
}

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -