java开发简易个人博客系统_基于jsp+servlet实现的简单博客系统实例(附源码)

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本文实例讲述了基于jsp+servlet实现的简单博客系统。分享给大家供大家参考。具体如下：
没有用框架写的小博客，代码大量重复。
个人感觉重复代码对于新手还是有好处的，我也是新手，见谅。
完整实例代码点击此处本站下载。
1. servlet
/*
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package Servlet;
import blog.BlogBean;
import blog.BlogRepositoryJDBC;
import blog.PagerUtil;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.URLDecoder;
import java.util.List;
import javax.enterprise.context.RequestScoped;
import javax.enterprise.context.SessionScoped;
import javax.inject.Inject;
import javax.inject.Named;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet(name = "PageListServlet", urlPatterns = {"/page/*", ""})
public class ListAllServlet extends HttpServlet {
@Inject
private BlogRepositoryJDBC blogdao;
@Inject
private PagerUtil pagerUtil;
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
int pg;
String s = request.getRequestURI();
String searchContent = request.getParameter("search");
if (s.matches(request.getContextPath() + "/page/" + "\\d")) {
String pgnum = s.replaceAll(request.getContextPath() + "/page/", "");
pg = Integer.parseInt(pgnum);
} else if (s.matches(request.getContextPath() + "/")) {
pg = 1;
} else {
getServletContext().getRequestDispatcher("/errorpage.jsp").forward(request, response);
return;
}
List bloglist;
boolean isNullRequest = (searchContent == null || "".equals(searchContent));
if (isNullRequest) {
bloglist = blogdao.getBloglist();
} else {
bloglist = blogdao.listBlogByKey(searchContent);
}
if (!pagerUtil.isValidPg(bloglist, pg)) {
getServletContext().getRequestDispatcher("/errorpage.jsp").forward(request, response);
return;
}
pagerUtil.fillValue(bloglist, pg);
String pageURLBase = getServletContext().getContextPath();
String pageURLparam = isNullRequest ? "" : "?search=" + searchContent;
request.setAttribute("pageURLBase", pageURLBase);
request.setAttribute("pageURLparam", pageURLparam);
request.setAttribute("bloglist", bloglist);
getServletContext().getRequestDispatcher("/blog.jsp").forward(request, response);
}
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}
@Override
public String getServletInfo() {
return "Short description";
}// 
}
2. dao
package blog;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.enterprise.context.ApplicationScoped;
import javax.inject.Inject;
import javax.inject.Named;
import javax.sql.DataSource;
@ApplicationScoped
@Named
public class BlogRepositoryJDBC implements BlogRepository {
@Resource(lookup = "jdbc/sample")
private DataSource ds;
private ArrayList bloglist;
private Set tagSet;
private Set categorySet;
private Map dateMap;
@PostConstruct
private void init() {
refreshCache();
}
@Override
public int addBlog(BlogBean blogi) {
String sql = "INSERT INTO POSTS VALUES (?,?,?,?,?)";
Connection conn = null;
PreparedStatement ps = null;
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