dsjaction.java

一个简单的打开、查询事件功能

package swdyx.bhdt;

import org.apache.struts.action.*;
import javax.servlet.http.*;
import swdyx.common.*;
import java.util.*;
import javax.sql.*;
public class DsjAction
    extends Action {
  private static final int PAGE_LENGTH = 10;
  public ActionForward execute(ActionMapping actionMapping,
                               ActionForm actionForm, HttpServletRequest
                               httpServletRequest,
                               HttpServletResponse httpServletResponse) {
    ActionForward myforward = null;
    String myaction = actionMapping.getParameter();

    if ("DsjList".equals(myaction)) {
      myforward = performDsjList(actionMapping, actionForm,
                                    httpServletRequest,
                                    httpServletResponse);
    }
    else if ("DsjCk".equals(myaction)) {
      myforward = performDsjCk(actionMapping, actionForm,
                                  httpServletRequest,
                                  httpServletResponse);
    }

    return myforward;
  }

  //进入大事记信息页面
  public ActionForward performDsjList(ActionMapping actionMapping,
                                         ActionForm actionForm,
                                         HttpServletRequest httpServletRequest,
                                         HttpServletResponse
                                         httpServletResponse) {
    //定义session
    HttpSession mySession = httpServletRequest.getSession();
    //设置初始查询条件
    mySession.setAttribute("DSJ", "1=1");
    //清空页码session
    mySession.setAttribute("PAGE", "");
    try {

      // 连接数据源
      DataSource ds = Datasource.getDataSource();
      List dsj = null;
      dsj = SperatePage(actionMapping, actionForm, httpServletRequest,
                           httpServletResponse);
      httpServletRequest.setAttribute("TYPE", dsj);

    }
    catch (Exception e) {
      return actionMapping.findForward("error");
    }
      return actionMapping.findForward("success");

 } //进入大事记信息页面  方法执行完毕

//打开列表时所用的分页方法     此方法为通用方法
  public List SperatePage(ActionMapping actionMapping,
                          ActionForm actionForm,
                          HttpServletRequest httpServletRequest,
                          HttpServletResponse httpServletResponse) {
    List dsj = null;
    try {
      //连接数据源
      DataSource ds = Datasource.getDataSource();
      //建立BhdtDao的对象bhdtDao
      DsjDao dsjDao = new DsjDao(ds);

      int offset; //申明页码变量

      //获取页面参数pager.offset 如：10 表示第二页
      String pageOffset = httpServletRequest.getParameter("pager.offset");

      //定位分页符
      //定义页码session
      HttpSession pagesession = httpServletRequest.getSession();

      //判断页码是否存在
      if (pageOffset == null || pageOffset.equals("")) { //如果不能从页面上取到页码或者取到的页码为空 则从第一次进来时设置的页码session中取
        pageOffset = pagesession.getAttribute("PAGE").toString();
      }
      //把取得的页码放入session
      pagesession.setAttribute("PAGE", pageOffset);

      if (pageOffset == null || pageOffset.equals("")) { //如果此时获得的页码还为空  则设置offset为0  否则offest=Integer.parseInt(pageOffset
        offset = 0;
      }
      else {
        offset = Integer.parseInt(pageOffset);
      }

      int size = 0;
      //当前url路径
      String url = httpServletRequest.getContextPath() + actionMapping.getPath() +
          ".do";

      //获取当前的查询条件  //从第一次进入该模块设置的session 中取   或者  从检索条件中设置的session 中取
      HttpSession mySession = httpServletRequest.getSession();
      String sFilter;
      sFilter = (String) mySession.getAttribute("DSJXX");
      //所有记录数
      size = dsjDao.countlist(sFilter);
      //分页显示连接   调用分页方法
      String pagerHeader = Separatepage.geneHtml(offset, size, PAGE_LENGTH, url);
      httpServletRequest.setAttribute("pagerHeader", pagerHeader);
      dsj = dsjDao.list(offset, PAGE_LENGTH, sFilter);

    }
    catch (Exception e) {
    }
    return dsj;
  } //打开列表时所用的分页方法    方法执行完毕

//打开各大事记信息页面
  public ActionForward performDsjCk(ActionMapping actionMapping,
                                       ActionForm actionForm,
                                       HttpServletRequest httpServletRequest,
                                       HttpServletResponse
                                       httpServletResponse) {

    //获取页面传来参数
    String xh = httpServletRequest.getParameter("xh");
    try {
      // 连接数据源
      DataSource ds = Datasource.getDataSource();

      //查看各大事记的具体信息
      DsjDao dsjDao = new DsjDao(ds);
      BhdtBo bhdtBo = dsjDao.retrieve(xh);
      httpServletRequest.setAttribute("DSJ", bhdtBo);

    }
    catch (Exception e) {
      return actionMapping.findForward("error");
    }
    return actionMapping.findForward("success");

  } //end

}