Jsp&Servlet入门级项目全程实录第7讲

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1、获取搜索条件值
     function searchStudent(){
                    $('#dg').datagrid('load',{
                         stuNo:$('#s_stuNo').val(),
                         stuName:$('#s_stuName').val(),
                         sex:$('#s_sex').combobox("getValue"),
                         bbirthday:$('#s_bbirthday').datebox("getValue"),
                         ebirthday:$('#s_ebirthday').datebox("getValue"),
                         gradeId:$('#s_gradeId').combobox("getValue")
                    });
               }

2、servlet
     String stuNo=request.getParameter("stuNo");
          String stuName=request.getParameter("stuName");
          String sex=request.getParameter("sex");
          String bbirthday=request.getParameter("bbirthday");
          String ebirthday=request.getParameter("ebirthday");
          String gradeId=request.getParameter("gradeId");
          
          Student student= new Student();
          if(stuNo!=null){
               student.setStuNo(stuNo);
               student.setStuName(stuName);
               student.setSex(sex);
               if(StringUtil.isNotEmpty(gradeId)){
                    student.setGradeId(Integer.parseInt(gradeId));
               }
          }
          //获取page、rows请求
          String page=request.getParameter("page");
          String rows=request.getParameter("rows");

          //封装
          PageBean pageBean=new PageBean(Integer.parseInt(page),Integer.parseInt(rows));
          
          Connection con=null;
          try {
               con=dbUtil.getCon();
               JSONObject result=new JSONObject();
               JSONArray jsonArray=JsonUtil.formatRsToJsonArray(studentDao.studentList(con, pageBean,student,bbirthday,ebirthday));
               int total=studentDao.studentCount(con,student,bbirthday,ebirthday);
               result.put("rows", jsonArray);
               result.put("total", total);
               ResponseUtil.write(response, result);
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          }finally{
               try {
                    dbUtil.closeCon(con);
               } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
               }
          }


3、查询dao
public ResultSet studentList(Connection con,PageBean pageBean,Student student,String bbirthday,String ebirthday)throws Exception{
          StringBuffer sb=new StringBuffer("select * from t_student s,t_grade g where s.gradeId=g.id");
          if(StringUtil.isNotEmpty(student.getStuNo())){
               sb.append(" and s.stuNo like '%"+student.getStuNo()+"%'");               
          }
          if(StringUtil.isNotEmpty(student.getStuName())){
               sb.append(" and s.StuName like '%"+student.getStuName()+"%'");               
          }
          if(StringUtil.isNotEmpty(student.getSex())){
               sb.append(" and s.sex ='"+student.getSex()+"'");               
          }
          if(student.getGradeId()!=-1){
               sb.append(" and s.GradeId ='"+student.getGradeId()+"'");               
          }
          if(StringUtil.isNotEmpty(bbirthday)){
               sb.append(" and TO_DAYS(s.birthday)>=TO_DAYS('"+bbirthday+"')");               
          }
          if(StringUtil.isNotEmpty(ebirthday)){
               sb.append(" and TO_DAYS(s.birthday)<=TO_DAYS('"+ebirthday+"')");               
          }
          
          if(pageBean!=null){
               sb.append(" limit "+pageBean.getStart()+","+pageBean.getRows());               
          }
          PreparedStatement pstmt=con.prepareStatement(sb.toString());
          return pstmt.executeQuery();
     }
     
     public int studentCount(Connection con,Student student,String bbirthday,String ebirthday)throws Exception{
          StringBuffer sb=new StringBuffer("select count(*) as total from t_student s,t_grade g where s.gradeId=g.id");
          if(StringUtil.isNotEmpty(student.getStuNo())){
               sb.append(" and s.stuNo like '%"+student.getStuNo()+"%'");               
          }
          if(StringUtil.isNotEmpty(student.getStuName())){
               sb.append(" and s.StuName like '%"+student.getStuName()+"%'");               
          }
          if(StringUtil.isNotEmpty(student.getSex())){
               sb.append(" and s.sex ='"+student.getSex()+"'");               
          }
          if(student.getGradeId()!=-1){
               sb.append(" and s.GradeId ='"+student.getGradeId()+"'");               
          }
          if(StringUtil.isNotEmpty(bbirthday)){
               sb.append(" and TO_DAYS(s.birthday)>=TO_DAYS('"+bbirthday+"')");               
          }
          if(StringUtil.isNotEmpty(ebirthday)){
               sb.append(" and TO_DAYS(s.birthday)<=TO_DAYS('"+ebirthday+"')");               
          }
          PreparedStatement pstmt=con.prepareStatement(sb.toString());
          ResultSet rs=pstmt.executeQuery();
          if(rs.next()){
               return rs.getInt("total");
          }else{
               return 0;
          }
     }

4、删除dao
     public int studentDelect(Connection con,String delIds)throws Exception{
          String sql="delete from t_student where stuId in("+delIds+")";
          PreparedStatement pstmt=con.prepareStatement(sql);
          return pstmt.executeUpdate();
     }

5、删除servlet
     String delIds=request.getParameter("delIds");
          
          Connection con=null;
          try {
               con=dbUtil.getCon();
               JSONObject result=new JSONObject();
               int delNums=studentDao.studentDelect(con, delIds);
               if(delNums>0){
                    result.put("success", "true");
                    result.put("delNums", delNums);
               }else{
                    result.put("errorMeg", "删除失败");
               }
               result.put("delNum", delNums);
               ResponseUtil.write(response, result);
          } catch (Exception e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
          }finally{
               try {
                    dbUtil.closeCon(con);
               } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
               }
          }

6、修改web.xml
         <servlet>
    <servlet-name>studentDeleteServlet</servlet-name>
    <servlet-class>com.java1234.web.StudentDeleteServlet</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>studentDeleteServlet</servlet-name>
    <url-pattern>/studentDelete</url-pattern>
  </servlet-mapping>

7、删除前端
     function deleteStudent(){
                    var selectedRows=$("#dg").datagrid('getSelections');
                    if(selectedRows.length==0){
                         $.messager.alert("系统提示","请选择要删除的数据！");
                         return;
                    }
                    var strIds=[];
                    for(var i=0;i<selectedRows.length;i++){
                         strIds.push(selectedRows[i].stuId);
                    }
                    var ids=strIds.join(",");
                    $.messager.confirm("系统提示","您确认要删掉这<font color=red>"+selectedRows.length+"</font>条数据吗？",function(r){
                         if(r){
                              $.post("studentDelete",{delIds:ids},function(result){
                                   if(result.success){
                                        $.messager.alert("系统提示","您已成功删除<font color=red>"+result.delNum+"</font>条数据!");
                                        $("#dg").datagrid("reload");
                                   }else{
                                        $.messager.alert("系统提示",result.errorMsg);
                                   }
                              },"json");
                         }
                    });
               }