??

?? 清華版的jsp基礎程序對新手很有用
?? 第 1 頁 / 共 2 頁
字號:
12 下一頁
例子13(效果如圖9.17所示)
提交小說內容的JSP頁面
story.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<%@ page import ="java.io.*" %>
<HTML>
<BODY>
 <H4>小說已有內容：</H4>
<Font size=1 Color=blue>
 <% File f=new File("F:/2000","story.txt");
    //列出小說的內容：
        try{ RandomAccessFile file=
             new RandomAccessFile(f,"r");
             String temp=null;
             while((temp=file.readUTF())!=null)
                {  byte  d[]=temp.getBytes("ISO-8859-1");
                  temp=new String(d); 
                  out.print("<BR>"+temp);
                }
             file.close();
           }
        catch(IOException e){}
 %> 
    <P>請輸入續寫的新內容：
    <Form action="examples/servlet/Write" method=post name=form>
      <TEXTAREA name="content" ROWs="12" COLS=80 WRAP="physical">
      </TEXTAREA>
      <BR>
      <INPUT type="submit" value="提交內容" name="submit">
     </FORM>
</BODY>
</HTML>

續寫文件的servlet源文件：
Write.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Write extends HttpServlet
{  //聲明一個共享的文件和共享字符串：
    File f=null;
    String use="yes" ; 
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {   //獲取提交的文件內容：
       String content=request.getParameter("content");
        //獲得一個向客戶發送數據的輸出流：
       PrintWriter out=response.getWriter();
       response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
       out.println("<HTML>"); 
       out.println("<BODY>");
       f=new File("F:/2000","story.txt");
      //把對文件的操作放入一個同步塊中，并通知
      //其它用戶該文件正在被操作中：
      if(use.startsWith("yes"))
        { synchronized(f)
            {  use="using";
              try{
                  RandomAccessFile file=new RandomAccessFile(f,"rw");
                  file.seek(file.length()); //定位到文件的末尾。
                  file.writeUTF(content);
                  file.close();
                  use="yes";
                  out.print("<BR>"+"contents have been Write to file");
                 }
              catch(IOException e){}
            }
          }
       //如果該小說正在被續寫，就通知客戶等待：
      else 
          {out.print("file is writing,wait please");
          }  
       out.println("</BODY>");
       out.println("</HTML>");
    }
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
    {  
      doPost(request,response);
    }
}

例子14(效果如圖9.18所示)
提交查詢條件的JSP頁面
condition.jsp:
<%@ page contentType="text/html;charset=GB2312" %>
<HTML>
<BODY bgcolor=cyan>
<Font size=1>
<FORM action="examples/servlet/Inquire" Method="post">
 <P>成績查詢
 <P>輸入姓名:
  <Input type=text name="name">
  <Input type=submit name="g" value="提交">
</Form>
<FORM action="examples/servlet/Inquire" Method="get" >
 <P>根據分數查詢名單:<BR>
  英語分數在 
 <Input type=text name="englishmin" value=1>
  和
 <Input type=text name="englishmax" value=100>
  之間
 <BR> 數學分數在 
 <Input type=text name="mathmin" value=1>
  和
 <Input type=text name="mathmax" value=100>
  之間  <BR>
  <Input type=submit  value="提交">
</Form>
</BODY>
</HTML>

負責查詢的servlet源文件：
Inquire.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class Inquire extends HttpServlet
{  public void init(ServletConfig config) throws ServletException
    {super.init(config);
    }
   //通過Post方法按名字查詢記錄：
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
  { PrintWriter out=response.getWriter();
    response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
    out.println("<HTML>"); 
    out.println("<BODY>");
  //獲取提交的姓名：
    String name=request.getParameter("name");
    String number,xingming;
    Connection con=null;
    Statement sql=null;
    ResultSet rs=null;
    int math,english,physics;
       try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          }
       catch(ClassNotFoundException e){}
       try
      {    con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
           sql=con.createStatement();
           String condition="SELECT * FROM students WHERE 姓名 = "+"'"+name+"'";
           rs=sql.executeQuery(condition);
        out.print("<Table Border>");
            out.print("<TR>");
            out.print("<TH width=100>"+"Number");
            out.print("<TH width=100>"+"Name");
            out.print("<TH width=50>"+"Math");
            out.print("<TH width=50>"+"English");
            out.print("<TH width=50>"+"Phsics");
            out.print("</TR>");
       while(rs.next())
           { out.print("<TR>");
             number=rs.getString(1); 
             out.print("<TD >"+number+"</TD>"); 
             xingming=rs.getString(2); 
             out.print("<TD >"+xingming+"</TD>");
             math=rs.getInt("數學成績"); 
             out.print("<TD >"+math+"</TD>"); 
             english=rs.getInt("英語成績"); 
             out.print("<TD >"+english+"</TD>");
             physics=rs.getInt("物理成績"); 
             out.print("<TD >"+physics+"</TD>");   
            out.print("</TR>") ;          
            }
       out.print("</Table>");
      con.close();
     }
    catch(SQLException e)
          {
          }
      out.println("</BODY>");
      out.println("</HTML>");
  }
  //通過Get方法按成績查詢記錄：
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
  { PrintWriter out=response.getWriter();
    response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
    out.println("<HTML>"); 
    out.println("<BODY>");
   //獲取提交的分數的最大值和最小值：
    String englishmax=request.getParameter("englishmax");
    String englishmin=request.getParameter("englishmin");
    String mathmax=request.getParameter("mathmax");
    String mathmin=request.getParameter("mathmin");
    String number,xingming;
    Connection con=null;
    Statement sql=null;
    ResultSet rs=null;
    int math,english,physics;
       try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          }
       catch(ClassNotFoundException e){}
       try
      {    con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
           sql=con.createStatement();
           String eCondition="英語成績 <= "+englishmax+" AND "+"英語成績 >= "+englishmin;
           String mCondition="數學成績 <= "+mathmax+" AND "+"數學成績 >= "+mathmin;
           
           String condition="SELECT * FROM students WHERE "+mCondition+" and "+eCondition;
           rs=sql.executeQuery(condition);
       out.print("<Table Border>");
            out.print("<TR>");
            out.print("<TH width=100>"+"Number");
            out.print("<TH width=100>"+"Name");
            out.print("<TH width=50>"+"Math");
            out.print("<TH width=50>"+"English");
            out.print("<TH width=50>"+"Phsics");
            out.print("</TR>");
       while(rs.next())
           { out.print("<TR>");
             number=rs.getString(1); 
             out.print("<TD >"+number+"</TD>"); 
             xingming=rs.getString(2); 
             out.print("<TD >"+xingming+"</TD>");
             math=rs.getInt("數學成績"); 
             out.print("<TD >"+math+"</TD>"); 
             english=rs.getInt("英語成績"); 
             out.print("<TD >"+english+"</TD>");
             physics=rs.getInt("物理成績"); 
             out.print("<TD >"+physics+"</TD>");   
            out.print("</TR>") ;          
            }
       out.print("</Table>");
      con.close();
     }
    catch(SQLException e)
     {
     }
    out.println("</BODY>");
    out.println("</HTML>");
  }
}

例子15
使用共享連接的servlet源文件
ShareInquire.java:
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
import java.sql.*;
public class ShareInquire extends HttpServlet
{  Connection con=null; //共享連接。
  public void init(ServletConfig config) throws ServletException
    {super.init(config);
      //加載JDBC-ODBC橋接器：
       try{Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          }
       catch(ClassNotFoundException e){}
    }
   //通過Post方法按名字查詢記錄：
  public  void doPost(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
  { PrintWriter out=response.getWriter();
    response.setContentType("text/html;charset=GB2312");//設置響應的MIME類型。
    out.println("<HTML>"); 
    out.println("<BODY>");
    Statement sql=null; 
    ResultSet rs=null; 
    if(con==null) 
    { try
       {   //第一個用戶負責建立連接con。
           con=DriverManager.getConnection("jdbc:odbc:sun","sa","");
           sql=con.createStatement();
           String condition="SELECT * FROM students";
           rs=sql.executeQuery(condition);
        out.print("<Table Border>");
            out.print("<TR>");
            out.print("<TH width=100>"+"Number");
            out.print("<TH width=100>"+"Name");
            out.print("<TH width=50>"+"Math");
            out.print("<TH width=50>"+"English");
            out.print("<TH width=50>"+"Phsics");
            out.print("</TR>");
       while(rs.next())
           { out.print("<TR>");
             out.print("<TD >"+rs.getString(1)+"</TD>"); 
             out.print("<TD >"+rs.getString(2)+"</TD>");
             out.print("<TD >"+rs.getInt("數學成績")+"</TD>"); 
             out.print("<TD >"+rs.getInt("英語成績")+"</TD>");
             out.print("<TD >"+rs.getInt("物理成績")+"</TD>");   
             out.print("</TR>") ;          
            }
         out.print("</Table>");
       }
     catch(SQLException e)
          {
          }
    }
   //其它客戶通過同步塊使用這個連接：
   else
    { synchronized(con)
       {try{ sql=con.createStatement();
             String condition="SELECT * FROM students";
             rs=sql.executeQuery(condition);
             out.print("<Table Border>");
             out.print("<TR>");
             out.print("<TH width=100>"+"Number");
             out.print("<TH width=100>"+"Name");
             out.print("<TH width=50>"+"Math");
             out.print("<TH width=50>"+"English");
             out.print("<TH width=50>"+"Phsics");
             out.print("</TR>");
             while(rs.next())
              { out.print("<TR>");
                out.print("<TD >"+rs.getString(1)+"</TD>"); 
                out.print("<TD >"+rs.getString(2)+"</TD>");
                out.print("<TD >"+rs.getInt("數學成績")+"</TD>"); 
                out.print("<TD >"+rs.getInt("英語成績")+"</TD>");
                out.print("<TD >"+rs.getInt("物理成績")+"</TD>");   
                out.print("</TR>") ;          
              }
            out.print("</Table>");
          }
        catch(SQLException e)
          {
          }
       }
    }
   out.println("</BODY>");
   out.println("</HTML>");
 }
  public void doGet(HttpServletRequest request,HttpServletResponse response) 
                        throws ServletException,IOException
 {  doPost(request,response);
 }
}

例子16(效果如圖9.19所示)
Boy.java：
import java.io.*;
import javax.servlet.*;
12 下一頁
?? 文件大小 70 K
?? 上傳用戶 ys0796
?? 所屬分類 Internet/網絡編程
??? 相關標簽

#jsp #清華 #程序
?? 快捷鍵說明

復制代碼 Ctrl + C
搜索代碼 Ctrl + F
全屏模式 F11
切換主題 Ctrl + Shift + D
顯示快捷鍵 ?
增大字號 Ctrl + =
減小字號 Ctrl + -
亚洲欧美第一页_禁久久精品乱码_粉嫩av一区二区三区免费野_久草精品视频

??

?? 快捷鍵說明
