购物系统①
因為有上學期的自己和同學的demo。所以進度比較快。
到目前為止。使用smartUpload做好了上傳商品功能，同時支持刪除商品功能。
期間遇到兩個問題。用smartUpload上傳商品的時候，
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如果是使用絕對路徑的話，在自己所建立的upload文件夾中是不會出現你上傳的照片的。如下圖圖一圖二所示
???????????????????????????????????????????? 圖一
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??????????????????????????????????????????? 圖二
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所以我改用同學的使用相對路徑進行保存
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?????????????????????????????????????????????????? 圖三
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?????????????????????????????????????????????????? 圖四
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????????????????????????????????????????????????? 圖五
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問題二
在guanli.jsp中，我把xuhao 寫成了xuehao。導致在在shopservlet中獲取不了這個值，所以刪除不了，最后順利解決了這個問題！
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備注：
1.附上到目前為止的源代碼和截圖
2.所有代碼都是我全部重新敲過，建議大伙可以自己多敲敲代碼
3.在shopservlet.java中把接下來需要的功能代碼全都復制進去了。也就是說shopservlet.jsp后期不能再增加內容了
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DBbean.java
1 package bean; 2 3 4 import java.sql.*; 5 //import javax.sql.*; 6 7 //import javax.naming.Context; 8 //import javax.naming.InitialContext; 9 10 public class DBbean 11 { 12 static Connection con; 13 static String url; 14 static String driverName="com.mysql.jdbc.Driver"; 15 static String userName="root"; 16 static String userPassword="123456"; 17 static String dbName="dbtemp"; 18 19 public DBbean() throws ClassNotFoundException,SQLException 20 { 21 url="jdbc:mysql://localhost/"+dbName+"?autoReconnect=true&useUnicode=true&characterEncoding=GBK&user="+userName+"&password="+userPassword; 22 } 23 public static Connection getDBConnection() 24 { 25 try{ 26 Class.forName("com.mysql.jdbc.Driver");//加載驅動 27 con=DriverManager.getConnection(url); 28 }catch(ClassNotFoundException e){ 29 }catch(SQLException e){} 30 return con; 31 } 32 /*public static Connection getPoolConnection() 33 { 34 try{ 35 Context ctx=new InitialContext();//向上轉型，Context是java.name包中的一個接口，用于查找數據庫連接池的配置文件 36 ctx=(Context)ctx.lookup("java:com/env"); 37 DataSource ds=(DataSource)ctx.lookup("DBPool"); 38 con=ds.getConnection(); 39 40 }catch(Exception e) 41 { 42 e.printStackTrace(); 43 } 44 return con; 45 }*/ 46 //運行更新。插入。刪除操作 47 public static void executesql(String query)throws SQLException 48 { 49 Statement stmt=null; 50 try{ 51 stmt=DBbean.getDBConnection().createStatement(); 52 stmt.execute(query); 53 stmt.close(); 54 }catch(SQLException e){} 55 56 } 57 //查詢一個整數字段值 58 public int getIntResult(String query)throws SQLException 59 { 60 Statement stmt=null; 61 int i=0; 62 try{ 63 stmt=DBbean.getDBConnection().createStatement(); 64 //stmt=DBbean.getPoolConncetion().creatStatement(); 65 ResultSet rs=stmt.executeQuery(query); 66 while(rs.next()) 67 { 68 i=Integer.parseInt(rs.getString(1)); 69 70 } 71 stmt.close(); 72 con.close(); 73 }catch(SQLException e){} 74 return i; 75 } 76 //查詢一個字符串字段值 77 public String getOneStringResult(String query,int i)throws SQLException 78 { 79 Statement stmt=null; 80 ResultSet rs=null; 81 String str="Null"; 82 try{ 83 stmt=DBbean.getDBConnection().createStatement(); 84 //stmt=DBbean.getPoolConnection().creatStatement(); 85 rs=stmt.executeQuery(query); 86 while(rs.next()) 87 { 88 str=rs.getString(i); 89 } 90 stmt.close(); 91 con.close(); 92 }catch(SQLException e){} 93 return str; 94 } 95 //查詢返回一個結果集 96 public static ResultSet getResultSet(String query)throws SQLException 97 { 98 ResultSet rs=null; 99 Statement stmt=null; 100 try{ 101 stmt=DBbean.getDBConnection().createStatement(); 102 rs=stmt.executeQuery(query); 103 104 }catch(SQLException e){ 105 e.printStackTrace(); 106 } 107 return rs; 108 } 109 //查詢一個字段的結果集，并以字符串數組形式返回 110 public String[] getResultSetToStr(String query)throws SQLException 111 { 112 ResultSet rs1=null,rs2=null; 113 int i=0,counter=0; 114 String[] name=null; 115 Statement stmt1=null,stmt2=null; 116 try{ 117 stmt1=DBbean.getDBConnection().createStatement(); 118 rs2=stmt1.executeQuery(query); 119 while(rs2.next()) 120 { 121 counter++; 122 } 123 stmt2=DBbean.getDBConnection().createStatement(); 124 rs1=stmt2.executeQuery(query); 125 name=new String[counter]; 126 while(rs1.next()) 127 { 128 name[i]=rs1.getString(1); 129 i++; 130 } 131 132 }catch(SQLException e) 133 { 134 e.printStackTrace(); 135 } 136 rs1.close(); 137 rs2.close(); 138 stmt1.close(); 139 stmt2.close(); 140 con.close(); 141 return name; 142 143 } 144 public static boolean execute(String query) 145 { 146 boolean result=false; 147 Statement stmt=null; 148 try{ 149 stmt=DBbean.getDBConnection().createStatement(); 150 result=stmt.execute(query); 151 152 }catch(SQLException e){} 153 return result; 154 } 155 public void closeon() throws SQLException 156 { 157 con.close(); 158 } 159 160 }?
shopservlet.java
1 package servlet; 2 3 import java.io.IOException; 4 import java.sql.ResultSet; 5 import java.sql.SQLException; 6 7 import javax.servlet.ServletException; 8 import javax.servlet.annotation.WebServlet; 9 import javax.servlet.http.HttpServlet; 10 import javax.servlet.http.HttpServletRequest; 11 import javax.servlet.http.HttpServletResponse; 12 13 import bean.DBbean; 14 15 /** 16 * Servlet implementation class shopservlet 17 */ 18 @WebServlet("/shopservlet") 19 public class shopservlet extends HttpServlet 20 { 21 private static final long serialVersionUID = 1L; 22 23 /** 24 * @see HttpServlet#HttpServlet() 25 */ 26 public shopservlet() 27 { 28 super(); 29 // TODO Auto-generated constructor stub 30 } 31 32 /** 33 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 34 */ 35 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 36 { 37 // TODO Auto-generated method stub 38 doPost(request,response); 39 } 40 41 /** 42 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 43 */ 44 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 45 { 46 // TODO Auto-generated method stub 47 request.setCharacterEncoding("gbk"); 48 String action=request.getParameter("action"); 49 if(action.equals("delete")) 50 { 51 String a=request.getParameter("xuhao"); 52 String sql="delete from shop where xuhao='"+a+"'"; 53 try{ 54 DBbean.executesql(sql); 55 }catch(SQLException e){ 56 //TODO Auto-generated catch block 57 e.printStackTrace(); 58 } 59 response.sendRedirect("guanli.jsp"); 60 } 61 if(action.equals("delete2")) 62 { 63 String a=request.getParameter("xuhao"); 64 String sql="delete from cart where xuhao='"+"'"; 65 try{ 66 DBbean.executesql(sql); 67 68 }catch(SQLException e){ 69 //TODO Auto-generated catch block 70 e.printStackTrace(); 71 } 72 response.sendRedirect("cart.jsp"); 73 } 74 if(action.equals("jian")) 75 { 76 String a=request.getParameter("xuhao"); 77 String sql="update cart set shuliang=shuliang-1 where xuhao='"+a+"'"; 78 try{ 79 DBbean.executesql(sql); 80 }catch(SQLException e){ 81 //TODO Auto-generated catch block 82 e.printStackTrace(); 83 } 84 response.sendRedirect("car.jsp"); 85 } 86 if(action.equals("jia")) 87 { 88 String a=request.getParameter("xuhao"); 89 String sql="update cart set shuliang =shuliang+1 where xuhao='"+a+"'"; 90 try { 91 DBbean.executesql(sql); 92 } catch (SQLException e) { 93 // TODO Auto-generated catch block 94 e.printStackTrace(); 95 } 96 response.sendRedirect("cart.jsp"); 97 } 98 if(action.equals("update")) 99 { 100 String a=request.getParameter("xuhao"); 101 String b=request.getParameter("mingchen"); 102 //b=new String(b.getBytes("ISO-8859-1"),"gbk"); 103 String c=request.getParameter("miaoshu"); 104 //c=new String(c.getBytes("ISO-8859-1"),"gbk"); 105 String d=request.getParameter("jiege"); 106 String e=request.getParameter("cunhuo"); 107 String f=request.getParameter("zhuangtai"); 108 //f=new String(f.getBytes("ISO-8859-1"),"gbk"); 109 String sql="update shop set "; 110 sql=sql+"mingchen='"+b+"', miaoshu='"+c+"', jiege='"+d+"', cunhuo='"+e+"', zhuangtai='"+f+"'"; 111 sql=sql+" where xuhao='"+a+"'"; 112 try { 113 DBbean.executesql(sql); 114 } catch (SQLException e1) { 115 // TODO Auto-generated catch block 116 e1.printStackTrace(); 117 } 118 response.sendRedirect("guanli.jsp"); 119 } 120 if(action.equals("qingkong")) 121 { 122 String sql="delete from cart"; 123 try { 124 DBbean.executesql(sql); 125 } catch (SQLException e) { 126 // TODO Auto-generated catch block 127 e.printStackTrace(); 128 } 129 response.sendRedirect("home.jsp"); 130 } 131 if(action.equals("upordown")) 132 { 133 String a=request.getParameter("xuhao"); 134 String b=new String(request.getParameter("zhuangtai").getBytes("iso-8859-1"),"gbk"); 135 String sql2=null; 136 try{ 137 if(b.equals("下架")) 138 { 139 sql2="update shop set zhuangtai='上架' where xuhao='"+a+"'"; 140 DBbean.executesql(sql2); 141 } 142 if(b.equals("上架")) 143 { 144 sql2="update shop set zhuangtai='上架' where xuhao='"+a+"'"; 145 DBbean.execute(sql2); 146 } 147 }catch(SQLException e){ 148 //TODO Auto-generated catch block 149 e.printStackTrace(); 150 } 151 response.sendRedirect("guanli.jsp"); 152 } 153 } 154 155 }uploadservlet.java
1 package servlet; 2 3 import java.io.IOException; 4 import java.sql.SQLException; 5 6 import javax.servlet.ServletConfig; 7 import javax.servlet.ServletException; 8 import javax.servlet.annotation.WebServlet; 9 import javax.servlet.http.HttpServlet; 10 import javax.servlet.http.HttpServletRequest; 11 import javax.servlet.http.HttpServletResponse; 12 13 import bean.DBbean; 14 15 import com.jspsmart.upload.File; 16 import com.jspsmart.upload.SmartUpload; 17 import com.jspsmart.upload.SmartUploadException; 18 19 /** 20 * Servlet implementation class uploadservlet 21 */ 22 @WebServlet("/uploadservlet") 23 public class uploadservlet extends HttpServlet 24 { 25 private static final long serialVersionUID = 1L; 26 private static final int SAVEAS_PHYSICAL=0; 27 ServletConfig servletconfig; 28 29 /** 30 * @see HttpServlet#HttpServlet() 31 */ 32 public uploadservlet() 33 { 34 super(); 35 // TODO Auto-generated constructor stub 36 } 37 public void init(ServletConfig config)throws ServletException 38 { 39 this.servletconfig=config; 40 } 41 42 /** 43 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) 44 */ 45 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 46 { 47 // TODO Auto-generated method stub 48 doPost(request,response); 49 } 50 51 /** 52 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) 53 */ 54 protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 55 { 56 // TODO Auto-generated method stub 57 request.setCharacterEncoding("gbk"); 58 SmartUpload su=new SmartUpload(); 59 su.initialize(servletconfig, request, response); 60 //limit the size of the upload's things 61 su.setMaxFileSize(1000000); 62 //限制總上傳數據的長度 63 su.setTotalMaxFileSize(2000000); 64 //設定允許上傳的文件（通過擴展名限制），禁止上傳帶有exe,bat,jsp,htm,html擴展名的文件和沒有擴展名的文件。 65 try{ 66 su.setDeniedFilesList("exe,bat,jsp,htm,html,"); 67 }catch(SQLException e){ 68 //TODO Auto-generated catch block 69 e.printStackTrace(); 70 } 71 try{ 72 su.upload(); 73 }catch(SmartUploadException e){ 74 //TODO Auto-generated catch block 75 e.printStackTrace(); 76 } 77 String a=su.getRequest().getParameter("xuhao"); 78 String b=su.getRequest().getParameter("mingchen"); 79 String c=su.getRequest().getParameter("miaoshu"); 80 String d=su.getRequest().getParameter("jiege"); 81 String e=su.getRequest().getParameter("cunhuo"); 82 String f=su.getRequest().getParameter("zhuangtai"); 83 File g=su.getFiles().getFile(0);//得到上傳的第一個文件 84 String h=b+"."+g.getFileExt(); 85 86 87 88 h="/upload/"+h; 89 String realpath="/dingcan/WebContent";//這個要根據具體情況填寫 90 realpath=realpath+h; 91 h="D:/Java"+realpath;//?? 92 System.out.println(h); 93 94 95 /*String path=request.getSession().getServletContext().getRealPath("/upload"); 96 System.out.println(path); 97 String h1="upload/"+h;*/ 98 99 100 101 String sql="insert into shop values("; 102 //sql=sql+"'"+a+"'"+","+"'"+b+"'"+","+"'"+c+"'"+"'"+"'"+h+"'"+","+"'"+d+"'"+","+"'"+e+"'"+","+"'"+f+"'"+")"; 103 sql=sql+"'"+a+"'"+","+"'"+b+"'"+","+"'"+c+"'"+","+"'"+h+"'"+","+"'"+d+"'"+","+"'"+e+"'"+","+"'"+f+"'"+")"; 104 try{ 105 DBbean.executesql(sql); 106 }catch(SQLException e1){ 107 //TODO Auto-generated catch block 108 e1.printStackTrace(); 109 } 110 try{ 111 g.saveAs(h, SAVEAS_PHYSICAL);//? 112 //g.saveAs(path+"/"+h); 113 114 }catch(SmartUploadException e1){ 115 //TODO Auto-generated catch block 116 e1.printStackTrace(); 117 } 118 response.sendRedirect("guanli.jsp"); 119 } 120 121 }guanli.jsp
1 <%@ page language="java" contentType="text/html; charset=gbk" 2 pageEncoding="gbk"%> 3 <%@ page import="com.mysql.jdbc.Driver" %> 4 <%@ page import="java.sql.*" %> 5 <%@ page import="bean.DBbean" %> 6 <jsp:useBean id="DBbean" scope="page" class="bean.DBbean"/> 7 <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> 8 <html> 9 <head> 10 <meta http-equiv="Content-Type" content="text/html; charset=gbk"> 11 <title>管理商品</title> 12 </head> 13 <body> 14 <h1 align="center">商品列表</h1> 15 <% 16 request.setCharacterEncoding("gbk"); 17 String sql="select * from shop"; 18 ResultSet rs=DBbean.getResultSet(sql); 19 %> 20 <table border="1" align="center"> 21 <tr> 22 <th>商品序號</th> 23 <th>商品名稱</th> 24 <th>商品價格</th> 25 <th>商品存貨</th> 26 <th>上下架管理</th> 27 </tr> 28 <%while(rs.next()){%> 29 <tr> 30 <td><%=rs.getString("xuhao") %></td> 31 <td><%=rs.getString("mingchen") %></td> 32 <td><%=rs.getString("jiege") %></td> 33 <td><%=rs.getString("cunhuo") %></td> 34 <td><a href='shopservlet?action=delete&xuhao=<%=rs.getString("xuhao") %>' οnclick="return confirm('確認將此記錄刪除？')">刪除</a></td> 35 <td><a href='update.jsp?action=update&xuhao=<%=rs.getString("xuhao")%>'>修改</a></td> 36 <%} 37 rs.close();%> 38 </tr> 39 </table> 40 <form action="uploadservlet" method="post" enctype="multipart/form-data" name="upload"> 41 <table align=center> 42 <tr> 43 <td align=center><h1>上傳商品</h1></td> 44 </tr> 45 <tr> 46 <td > 47 序號<input type="text" name="xuhao" size="10">名稱<input type="text" name="mingchen" size="20"> 48 價格<input type="text" name="jiege" size="10">存貨<input type="text" name="cunhuo" size="10"><br> 49 描述<textarea name="miaoshu" rows="5" cols="65"></textarea><br> 50 商品狀態選擇：<input type="radio" name="zhuangtai" value="上架" checked="checked">存入倉庫<input type="radio" name="zhuangtai" value="下架">發布商品  51 上傳圖片<input type="file" name="tupian" size="20"> 52 </td> 53 </tr> 54 <tr> 55 <td align="center"><input value="開始上傳" type="submit"></td> 56 </tr> 57 </table> 58 </form> 59 </body> 60 </html>運行界面
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轉載于:https://www.cnblogs.com/zzzzw/p/4532887.html
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