Java实现的进销存管理系统，可用作毕业设计，课程设计

package com.mingri.info; import com.mingri.dbconn.DBResult; import java.sql.ResultSet; import java.sql.SQLException; public class QuestString { private int curPage; //当前页数 private int maxPage; //最大页数 private int maxRowCount; //总记录数(即从数据库中查出的所有记录) private int pageSize=2; //每页要显示的记录数 private DBResult db; //记录集对象 private String httpFile; //当前地址栏的文件，即具体的JSP文件 private String cif; //选择的查询字段 private String ccif; //选择的查询运算符 private String qvalue; //查询关键字 private String countSql=null; //用来存储select count (*) ……语句 private String topSql=null; //用来存储 select top 2……语句 private String nowPage=null; //初始化当前页curPage变量，即获取当前页的具体页号 private String str_parameter; //在做翻页时，传递除pages以外的其他参数 private String andor; //查询的与/或条件 private String sdate; //查询起始时间，即从什么日期开始查询 private String edate; //查询结束时间，即到什么日期结束 private String orderby; //排序条件，即按什么排序 private String paixu; //排序方法，即升序或降序 public QuestString(){ //构造方法，用来设置db为一个DBResult()对象 pageSize = 2; countSql = null; topSql = null; nowPage = null; db = new DBResult(); } public int getCurPage() { return curPage; } public void setCurPage(int i) { curPage = i; } public int getMaxPage() { return maxPage; } public void setMaxPage(int i) { maxPage = i; } public int getMaxRowCount() { return maxRowCount; } public void setMaxRowCount(int i) { maxRowCount = i; } public int getPageSize() { return pageSize; } public void setPageSize(int i) { pageSize = i; } public String getHttpFile() { return httpFile; } public void setHttpFile(String s) { httpFile = s; } public String getCcif() { return ccif; } public void setCcif(String s) { ccif = s; } public String getCif() { return cif; } public void setCif(String s) { cif = s; } public String getQValue() { return qvalue; } public void setQValue(String s) { qvalue = s; } public String getStr_parameter() { return str_parameter; } public void setStr_parameter(String s) { str_parameter = s; } public String getAndor() { return andor; } public void setAndor(String s) { andor = s; } public String getSdate() { return sdate; } public void setSdate(String s) { sdate = s; } public String getEdate() { return edate; } public void setEdate(String s) { edate = s; } public String getOrderby() { return orderby; } public void setOrderby(String s) { orderby = s; } public String getPaixu() { return paixu; } public void setPaixu(String s) { paixu = s; } /** * 通过参数传递来设置Bean中的属性 */ public void setQuerySql(String s, String s1, String s2) { nowPage = s1; //将表单提交过来的参数pages(第几页)的值传递给变量nowPage保存 httpFile = s; //用来动态设置处理表单请求的JSP文件 countSql = s2; //用来设置执行select count(*)……的SQL语句 try { querySql(countSql);//调用querySql()方法，并将参数countSql传递到该方法中 } catch (Exception exception) { exception.printStackTrace(); } } /** * 执行SQL语句，获得分页显示时的各个属性 */ public void querySql(String s) throws SQLException { if (nowPage == null || "".equals(nowPage)) { curPage = 1; } else { curPage = Integer.parseInt(nowPage); if (curPage < 1) curPage = 1; } ResultSet resultset = db.getResult(s); if (resultset.next()) maxRowCount = resultset.getInt(1); maxPage = maxRowCount % pageSize != 0 ? maxRowCount / pageSize + 1 : maxRowCount / pageSize; if (curPage > maxPage) curPage = maxPage; resultset.close(); } /** * 一个字符串，用来动态的给出一个表单 * 该表单用来进行分页和统计页面间的跳转 */ public String pageFooter() { //创建一个表单 String s = "<form action=" + httpFile + " name=formBean methord=post>"; int i = curPage - 1;//向前翻页，即当前页减1 int j = curPage + 1;//向后翻页，即当前页加1 s = s + "<font style='font-size: 10pt'>总计<font color='red'>" + getMaxRowCount() + "</font>条记录," + "【共<font color='red'>" + getMaxPage() + "</font>页】"; s = s + "【 <font color='red'>" + pageSize + "</font>条/页】 当前第<font color='red'>" + getCurPage() + "</font>页 &nbsp; "; if (curPage > 1) s = s + " <A href=" + httpFile + "?pages=1" + str_parameter + ">首页</A> "; else s = s + " 首页 "; if (curPage > 1) s = s + " <A href=" + httpFile + "?pages=" + i + str_parameter + ">上一页</A> "; else s = s + " 上一页 "; if (curPage < maxPage) s = s + " <A href=" + httpFile + "?pages=" + j + str_parameter + ">下一页</A> "; else s = s + " 下一页 "; if (maxPage > 1 && curPage != maxPage) s = s + " <A href=" + httpFile + "?pages=" + maxPage + str_parameter + ">尾页</A>"; else s = s + " 尾页</font>";//在页面跳转间设置隐藏表单，来保存不同的请求 s = s + "转到<input type ='text' name='pages' size='2'>页" + "<input type='hidden' name='ccif' value='" + ccif + "'><input type ='hidden' name='cif' value='" + cif + "'><input type ='hidden' name='qvalue' value='" + qvalue + "'><input type ='hidden' name='andor' value='" + andor + "'><input type ='hidden' name='sdate' value='" + sdate + "'><input type ='hidden' name='edate' value='" + edate + "'><input type ='hidden' name='orderby' value='" + orderby + "'><input type ='hidden' name='paixu' value='" + paixu + "'><input type='submit' name='sumbmit' value='go'></form>"; return s; } /** * 根据不同条件来获取不同的查询前N条记录的SQL语句 */ public String getString(String s) { if (ccif.equals("=")) { String s1 = "select top " + pageSize * curPage + " * from " + s + " where" + " " + cif + "=" + "'" + qvalue + "'"; return s1; } if (ccif.equals("LIKE")) { String s2 = "select top " + pageSize * curPage + " * from " + s + " where" + " " + cif + " " + "like" + " " + "'%" + qvalue + "%'"; return s2; } if (ccif.equals("ALL")) { String s3 = "select top " + pageSize * curPage + " * from " + s; return s3; } if (ccif.equals("<")) { String s4 = "select top " + pageSize * curPage + " * from " + s + " where " + cif + " < '" + qvalue + "'"; return s4; } else { return null; } } public String getXSString(String s) { if (ccif.equals("=")) { String s1 = "select top " + pageSize * curPage + " * from " + s + " where" + " " + cif + "=" + "'" + qvalue + "' and whether='否'"; return s1; } if (ccif.equals("LIKE")) { String s2 = "select top " + pageSize * curPage + " * from " + s + " where" + " " + cif + " " + "like" + " " + "'%" + qvalue + "%'and whether='否'"; return s2; } else { return null; } } /** * 根据不同条件来获得不同的计算记录总数的SQL语句 */ public String getCount(String s) { if (ccif.equals("=")) { String s1 = "select count(*) from " + s + " where" + " " + cif + "=" + "'" + qvalue + "'"; return s1; } if (ccif.equals("LIKE")) { String s2 = "select count(*) from " + s + " where" + " " + cif + " " + "like" + " " + "'%" + qvalue + "%'"; return s2; } if (ccif.equals("ALL")) { String s3 = "select count(*) from " + s; return s3; } if (ccif.equals("<")) { String s4 = "select count(*) from " + s + " where " + cif + " < '" + qvalue + "'"; return s4; } else { return null; } } public String getXSCount(String s) { if (ccif.equal