JAVAWEB项目新闻发布管理系统第四篇

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1、下面实现前台首页，新闻分类（体育新闻，科技新闻等），新闻列表分页。1、首页旳jsp代码；java view plaincopyprint?1. 2. 3. 4. 5. 新闻主页6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 新闻主页 2、新闻分类，新闻分页旳实现： java view plaincopyprint?1. packagecom.news.action;2. 3. importjava.io.IOExcept

2、ion;4. 5. importjavax.servlet.ServletException;6. importjavax.servlet.http.HttpServletRequest;7. importjavax.servlet.http.HttpServletResponse;8. 9. importcom.news.domain.News;10. importcom.news.domain.PageBean;11. importcom.news.domain.QueryInfo;12. importcom.news.service.FrontNewsService;13. import

3、com.news.utils.WebUtils;14. 15. publicclassFrontNewsActionextendsBaseAction16. publicvoidfindAllNews(HttpServletRequestrequest,HttpServletResponseresponse)throwsException17. try18. /synchronized(this) 19. QueryInfoinfo=WebUtils.request2bean(request,QueryInfo.class);20. FrontNewsServiceservice=newFro

4、ntNewsService();21. Stringcid=request.getParameter(category_id);22. intcategory_id=0;23. if(cid!=null)24. category_id=Integer.parseInt(cid);25. 26. PageBeanbean=service.pageQuery(info,category_id);27. System.out.println(大小是：+bean.getList().size();28. Stringjsp_Page=/news_jsps/News_All.jsp;29. System

5、.out.println(category_id);30. if(category_id=1)31. jsp_Page=/news_jsps/News_Technology.jsp;32. elseif(category_id=2)33. jsp_Page=/news_jsps/News_Sports.jsp;34. elseif(category_id=3)35. jsp_Page=/news_jsps/News_Popular.jsp;36. 37. request.setAttribute(pagebean,bean);38. request.getRequestDispatcher(j

6、sp_Page).forward(request,response);39. / 40. 41. catch(Exceptione)42. e.printStackTrace();43. request.setAttribute(message,查看新闻列表失败！);44. request.getRequestDispatcher(/message.jsp).forward(request,response);45. 46. 47. publicvoidfindNewsById(HttpServletRequestrequest,HttpServletResponseresponse)thro

7、wsException48. try49. Stringnews_id=request.getParameter(news_id);50. FrontNewsServiceservice=newFrontNewsService();51. Newsnews=service.findNewsById(Integer.parseInt(news_id);52. request.setAttribute(news,news);53. request.getRequestDispatcher(/news_jsps/News_Information.jsp).forward(request,respon

8、se);54. catch(Exceptione)55. e.printStackTrace();56. request.setAttribute(message,查看新闻失败！);57. request.getRequestDispatcher(/message.jsp).forward(request,response);58. 59. 60. package com.news.action;import java.io.IOException;import javax.servlet.ServletException;import javax.servlet.http.HttpServl

9、etRequest;import javax.servlet.http.HttpServletResponse;import com.news.domain.News;import com.news.domain.PageBean;import com.news.domain.QueryInfo;import com.news.service.FrontNewsService;import com.news.utils.WebUtils;public class FrontNewsAction extends BaseActionpublic void findAllNews(HttpServ

10、letRequest request,HttpServletResponse response) throws Exceptiontry/synchronized (this) QueryInfo info=WebUtils.request2bean(request, QueryInfo.class);FrontNewsService service=new FrontNewsService();String cid=request.getParameter(category_id);int category_id=0;if(cid!=null)category_id=Integer.pars

11、eInt(cid);PageBean bean= service.pageQuery(info,category_id);System.out.println(大小是：+bean.getList().size();String jsp_Page=/news_jsps/News_All.jsp;System.out.println(category_id);if(category_id=1)jsp_Page=/news_jsps/News_Technology.jsp;else if(category_id=2)jsp_Page=/news_jsps/News_Sports.jsp;else i

12、f(category_id=3)jsp_Page=/news_jsps/News_Popular.jsp;request.setAttribute(pagebean, bean);request.getRequestDispatcher(jsp_Page).forward(request, response);/catch (Exception e) e.printStackTrace();request.setAttribute(message, 查看新闻列表失败！);request.getRequestDispatcher(/message.jsp).forward(request, re

13、sponse);public void findNewsById(HttpServletRequest request,HttpServletResponse response) throws ExceptiontryString news_id=request.getParameter(news_id); FrontNewsService service=new FrontNewsService();News news= service.findNewsById(Integer.parseInt(news_id);request.setAttribute(news, news);reques

14、t.getRequestDispatcher(/news_jsps/News_Information.jsp).forward(request, response);catch (Exception e) e.printStackTrace();request.setAttribute(message, 查看新闻失败！);request.getRequestDispatcher(/message.jsp).forward(request, response);service层： java view plaincopyprint?1. packagecom.news.service;2. 3.

15、importcom.news.dao.FrontNewsDao;4. importcom.news.domain.News;5. importcom.news.domain.PageBean;6. importcom.news.domain.QueryInfo;7. importcom.news.domain.QueryResult;8. 9. publicclassFrontNewsService10. 11. FrontNewsDaodao=newFrontNewsDao();12. publicPageBeanpageQuery(QueryInfoqueryInfo,intcategor

16、y_id)throwsException13. 14. /调用dao获得页面数据 15. QueryResultqr=dao.pageQuery(queryInfo.getStartindex(),queryInfo.getPagesize(),category_id);16. /把获得页面数据封装到pagebean里面 17. PageBeanpagebean=newPageBean();18. pagebean.setList(qr.getList();19. pagebean.setTotalrecord(qr.getTotalrecord();20. pagebean.setCurre

17、ntpage(queryInfo.getCurrentpage();21. pagebean.setPagesize(queryInfo.getPagesize();22. returnpagebean;23. 24. publicNewsfindNewsById(intnews_id)throwsException25. returndao.findNewsById(news_id);26. 27. package com.news.service;import com.news.dao.FrontNewsDao;import com.news.domain.News;import com.

18、news.domain.PageBean;import com.news.domain.QueryInfo;import com.news.domain.QueryResult;public class FrontNewsService FrontNewsDao dao=new FrontNewsDao();public PageBean pageQuery(QueryInfo queryInfo,int category_id) throws Exception/调用dao获得页面数据QueryResult qr= dao.pageQuery(queryInfo.getStartindex(

19、), queryInfo.getPagesize(),category_id);/把获得页面数据封装到pagebean里面PageBean pagebean=new PageBean();pagebean.setList(qr.getList();pagebean.setTotalrecord(qr.getTotalrecord();pagebean.setCurrentpage(queryInfo.getCurrentpage();pagebean.setPagesize(queryInfo.getPagesize();return pagebean;public News findNews

20、ById(int news_id) throws Exception returndao.findNewsById(news_id);dao层： java view plaincopyprint?1. packagecom.news.dao;2. 3. importjava.sql.Connection;4. importjava.sql.PreparedStatement;5. importjava.sql.ResultSet;6. importjava.util.ArrayList;7. importjava.util.HashMap;8. importjava.util.LinkedLi

21、st;9. importjava.util.List;10. importjava.util.Map;11. 12. importnet.sf.json.JSONArray;13. 14. importmons.dbutils.DbUtils;15. 16. importcom.news.domain.Category;17. importcom.news.domain.News;18. importcom.news.domain.QueryResult;19. importcom.news.utils.JdbcUtils;20. 21. publicclassFrontNewsDao22.

22、publicQueryResultpageQuery(intstartindex,intpagesize,intcategory_id)throwsException23. 24. Connectionconn=null;25. PreparedStatementst=null;26. ResultSetrs=null;27. QueryResultqr=newQueryResult();28. try29. conn=JdbcUtils.getConnection();30. Stringsql=select*fromtb_newsorderbyiddesclimit?,?;31. Syst

23、em.out.println(分类id：+category_id);32. if(category_id0)33. sql=select*fromtb_newswherecategory_id=?orderbyiddesclimit?,?;34. 35. st=conn.prepareStatement(sql);36. if(category_id0)37. st.setInt(1,category_id);38. st.setInt(2,startindex);39. st.setInt(3,pagesize);40. else41. st.setInt(1,startindex);42.

24、 st.setInt(2,pagesize);43. 44. rs=st.executeQuery();45. Listlist=newLinkedList();46. while(rs.next()47. 48. Newsn=newNews();49. n.setTitle(rs.getString(title);50. n.setContent(rs.getString(content);51. n.setNews_id(rs.getInt(id);52. n.setDate(rs.getDate(date);53. n.setCategory(newCategory(rs.getInt(

25、category_id),null);54. list.add(n);55. 56. if(category_id0)57. sql=selectcount(*)fromtb_newswherecategory_id=?;58. else59. sql=selectcount(*)fromtb_news;60. 61. st=conn.prepareStatement(sql);62. if(category_id0)63. st.setInt(1,category_id);64. 65. rs=st.executeQuery();66. if(rs.next()67. 68. qr.setT

26、otalrecord(rs.getInt(1);69. 70. qr.setList(list);71. returnqr;72. catch(Exceptione)73. /TODOAuto-generatedcatchblock 74. thrownewException(e);75. finally76. DbUtils.closeQuietly(conn,st,rs);77. 78. 79. publicNewsfindNewsById(intnews_id)throwsException80. Connectionconn=null;81. PreparedStatementst=n

27、ull;82. ResultSetrs=null;83. try84. conn=JdbcUtils.getConnection();85. Stringsql=select*fromtb_newswhereid=?;86. st=conn.prepareStatement(sql);87. st.setInt(1,news_id);88. rs=st.executeQuery();89. Newsn=newNews();90. if(rs.next()91. 92. 93. n.setTitle(rs.getString(title);94. n.setContent(rs.getStrin

28、g(content);95. n.setNews_id(rs.getInt(id);96. n.setDate(rs.getDate(date);97. n.setCategory(newCategory(rs.getInt(category_id),null);98. 99. returnn;100. catch(Exceptione)101. /TODOAuto-generatedcatchblock 102. thrownewException(e);103. finally104. DbUtils.closeQuietly(conn,st,rs);105. 106. 107. pack

29、age com.news.dao;import java.sql.Connection;import java.sql.PreparedStatement;import java.sql.ResultSet;import java.util.ArrayList;import java.util.HashMap;import java.util.LinkedList;import java.util.List;import java.util.Map;import net.sf.json.JSONArray;import mons.dbutils.DbUtils;import com.news.

30、domain.Category;import com.news.domain.News;import com.news.domain.QueryResult;import com.news.utils.JdbcUtils;public class FrontNewsDao public QueryResult pageQuery(int startindex,int pagesize,int category_id) throws ExceptionConnection conn=null;PreparedStatement st=null;ResultSet rs=null;QueryRes

31、ult qr=new QueryResult();try conn=JdbcUtils.getConnection();String sql=select * from tb_news order by id desc limit ?,?;System.out.println(分类id：+category_id);if(category_id0)sql=select * from tb_news where category_id=? order by id desc limit ?,? ;st=conn.prepareStatement(sql);if(category_id0)st.set

32、Int(1,category_id );st.setInt(2, startindex);st.setInt(3, pagesize);elsest.setInt(1, startindex);st.setInt(2, pagesize);rs=st.executeQuery();List list=new LinkedList();while(rs.next()News n=new News();n.setTitle(rs.getString(title);n.setContent(rs.getString(content);n.setNews_id(rs.getInt(id);n.setD

33、ate(rs.getDate(date);n.setCategory(new Category(rs.getInt(category_id),null);list.add(n);if(category_id0)sql=select count(*) from tb_news where category_id=?;elsesql=select count(*) from tb_news;st=conn.prepareStatement(sql);if(category_id0)st.setInt(1,category_id );rs=st.executeQuery();if(rs.next()

34、qr.setTotalrecord(rs.getInt(1);qr.setList(list);return qr; catch (Exception e) / TODO Auto-generated catch blockthrow new Exception(e);finally DbUtils.closeQuietly(conn, st, rs);public News findNewsById(int news_id) throws ExceptionConnection conn=null;PreparedStatement st=null;ResultSet rs=null;try

35、 conn=JdbcUtils.getConnection();String sql=select * from tb_news where id=?;st=conn.prepareStatement(sql);st.setInt(1, news_id);rs=st.executeQuery();News n=new News();if(rs.next()n.setTitle(rs.getString(title);n.setContent(rs.getString(content);n.setNews_id(rs.getInt(id);n.setDate(rs.getDate(date);n

36、.setCategory(new Category(rs.getInt(category_id),null);return n; catch (Exception e) / TODO Auto-generated catch blockthrow new Exception(e);finally DbUtils.closeQuietly(conn, st, rs);工具类： java view plaincopyprint?1. packagecom.news.utils;2. importjava.sql.Connection;3. importjava.sql.ResultSet;4. i

37、mportjava.sql.SQLException;5. importjava.sql.Statement;6. 7. importjavax.servlet.ServletContextEvent;8. importjavax.servlet.ServletContextListener;9. importjavax.sql.DataSource;10. 11. importcom.mchange.v2.c3p0.ComboPooledDataSource;12. importcom.mchange.v2.c3p0.DataSources;13. 14. publicclassJdbcUt

38、ilsimplementsServletContextListener15. 16. privatestaticComboPooledDataSourceds=null;17. static18. try19. ds=newComboPooledDataSource();20. catch(Exceptione)21. /TODO:handleexception 22. thrownewExceptionInInitializerError(e);23. 24. 25. publicstaticDataSourcegetDateSource()26. returnds;27. 28. publ

39、icstaticConnectiongetConnection()throwsSQLException29. returnds.getConnection();30. 31. publicstaticvoidrelease(Connectionconn,Statementst,ResultSetrs)32. 33. if(rs!=null)34. 35. try36. rs.close();37. catch(Exceptione)38. /TODO:handleexception 39. e.printStackTrace();40. 41. rs=null;42. 43. if(st!=null)44. 45. try46. st.close();47. catch(Exceptione)48. /TODO:handleexception 49. e.printStackTrace();50. 51. st=null;52. 53. if(conn!=null)54. try55. conn.close();56. catch(Exceptione)57. /TODO:handleexception 58.