Jsp/Servlet

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Java

BlogServlet.java：源码内容
							package com.appspot.cindyblog.servlet;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.persistence.EntityManager;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.appspot.cindyblog.common.EMF;
import com.appspot.cindyblog.common.User;
import com.appspot.cindyblog.pojo.ArticleBean;
import com.appspot.cindyblog.pojo.DiscussBean;
import com.appspot.cindyblog.pojo.LinkBean;
import com.appspot.cindyblog.pojo.MessageBean;
import com.appspot.cindyblog.pojo.TypeBean;
import com.appspot.cindyblog.util.Counter;
public class BlogServlet extends BaseServlet {
	private static final long serialVersionUID = 5709330878821727568L;
	public void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
		String m = request.getParameter("m");
		if("getIndex".equals(m)){
			this.getIndex(request, response);
		}else if("getSingleArticle".equals(m)){
			getSingleArticle(request, response);
		}else if("getMessageList".equals(m)){
			getMessageList(request, response);
		}else if("getArticleList".equals(m)){
			getArticleList(request, response);
		}else if("getArticle".equals(m)){
			getArticle(request, response);
		}else if("getDiscussList".equals(m)){
			getDiscussList(request, response);
		}else if("login".equals(m)){
			login(request, response);
		}
	}
	
	public void getIndex(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
		response.setContentType("text/html;charset=utf-8");
		EntityManager em = null;
		try{
			bs = getBlogService();
			em = EMF.get().createEntityManager();
			String rz = bs.getObjectList(ArticleBean.class, em, "time", 0, 5);
			String ly = bs.getObjectList(MessageBean.class, em, "time", 0, 5);
			String fl = bs.getType(em);
			String pl = bs.getObjectList(DiscussBean.class, em, "time", 0, 5);
			String link = bs.getObjectList(LinkBean.class, em);
			String str = "var elements = {nodes:{ly:"+ly+",fl:"+fl+",rz:"+rz+",pl:"+pl+",link:"+link+"}}";
			response.getWriter().print(str);
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			bs = null;
			closeEntityManager(em);
		}
	}
	
	public void getSingleArticle(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String id = request.getParameter("nowPage");
		int articleId = -1;
		response.setContentType("text/html;charset=utf-8");
		EntityManager em = null;
		try {
			if(id != null && !"".equals(id)){
				articleId = Integer.parseInt(id);
				bs = getBlogService();
				em = EMF.get().createEntityManager();
				String str = bs.getObjectById(ArticleBean.class,new Long(articleId), em);
				String html = "var elements = {nodes:{rz_single:["+str+"]}}";
				response.getWriter().print(html);
			}else{
				response.getWriter().print("false");
			}
		} catch (Exception e) {
			e.printStackTrace();
		}finally{
			bs = null;
			closeEntityManager(em);
		}
	}
	
	public void getMessageList(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String page = request.getParameter("nowPage");
		int nowPage = 0;
		EntityManager em = null;
		response.setContentType("text/html;charset=utf-8");
		try {
			if(page != null || !"".equals(page)){
				nowPage = Integer.parseInt(page);
			}
			bs = getBlogService();
			em = EMF.get().createEntityManager();
			String str = bs.getObjectList(MessageBean.class, em, "time", nowPage*20, 20);
			String html = "var elements = {page:{nowPage:"+(nowPage+1)+",allPage:"+((Counter.getMessageCount()-1)/10+1)+"},nodes:{ly_list:"+str+"}}";
			response.getWriter().print(html);
		} catch (NumberFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			bs = null;
			closeEntityManager(em);
		}
	}
	
	public void getArticleList(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String page = request.getParameter("nowPage");
		String type = request.getParameter("type");
		response.setContentType("text/html;charset=utf-8");
		EntityManager em = null;
		int nowPage = 0;
		try {
			if(page != null || !"".equals(page)){
				nowPage = Integer.parseInt(page);
			}
			em = EMF.get().createEntityManager();
			int allCount = Counter.getArticleCount(type);
			Map<String,String> map = new HashMap<String,String>();
			if(!"All".equals(type)){
				map.put("type", type);
			}
			bs = getBlogService();
			String str = bs.getObjectList(ArticleBean.class, em, "time", map, nowPage*20, 20);
			String html = "var elements = {page:{nowPage:"+(nowPage+1)+",allPage:"+((allCount-1)/20+1)+"},nodes:{rz_list:"+str+"}}";
			response.getWriter().print(html);
		} catch (NumberFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			bs = null;
			closeEntityManager(em);
		}
	}
	
	public void getDiscussList(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String page = request.getParameter("nowPage");
		String type = request.getParameter("type");
		int nowPage = 0;
		int allPage = 0;
		int article_id = -1;
		EntityManager em = EMF.get().createEntityManager();
		bs = getBlogService();
		try {
			Map<String,String> map = new HashMap<String,String>();
			if(page != null || !"".equals(page)){
				nowPage = Integer.parseInt(page);
			}
			if(type != null && !"".equals(type) && !"All".equals(type)){
				article_id = Integer.parseInt(type);
				allPage = counter.getSingleDisscussCount(article_id);
				map.put("article_id", article_id+"");
			}else if("All".equals("type")){
				allPage = counter.getDisscussCount();
			}
			String str = bs.getObjectList(DiscussBean.class, em, "time", map, nowPage*20, 20);
			String html = "var elements = {page:{nowPage:"+(nowPage+1)+",allPage:"+((allPage-1)/10+1)+"},nodes:{pl_list:"+str+"}}";
			response.setContentType("text/html;charset=utf-8");
			response.getWriter().print(html);
		} catch (NumberFormatException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			bs = null;
			closeEntityManager(em);
		}
	}
	
	public void getArticle(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		bs = getBlogService();
		EntityManager em = EMF.get().createEntityManager();
		try {
			String rz = bs.getObjectList(ArticleBean.class, em, "time", 0, 5);
			String html = "var elements = {nodes:{rz:"+rz+"}}";
			response.setContentType("text/html;charset=utf-8");
			response.getWriter().print(html);
		} catch (RuntimeException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}finally{
			bs = null;
			closeEntityManager(em);
		}
	}	
	
	public void login(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		String username = request.getParameter("username");
		String password = request.getParameter("pwd");
		User user = User.getUser();
		response.setContentType("text/html;charset=utf-8");
		String html = "";
		if(user.getUsername().equals(username) && user.getPassword().equals(password)){
			request.getSession().setAttribute("username", username);
			html = "<script>alert('登录成功！');parent.window.location='/admins/admin.jsp'</script>";
		}else{
			html = "<script>alert('登录失败！');</script>";
		}
		response.getWriter().print(html);
	}
}

						