Mvc的应用实例Word文档格式.docx

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Mvc的应用实例Word文档格式.docx

xmlversion="

1.0"

encoding="

ISO-8859-1"

>

web-app>

servlet>

<

servlet-name>

computerSum<

/servlet-name>

servlet-class>

sun.yourservlet.HandleSum<

/servlet-class>

/servlet>

servlet-mapping>

url-pattern>

/lookSum<

/url-pattern>

/servlet-mapping>

/web-app>

WEB.XML要保存到WEB-INF目录下。

一、模型

Series.java

packagemoon.yourbean;

publicclassSeries

{doublefirstItem;

//数列首项

doublevar;

//公差或公比

intnumber;

//求和项数

doublesum;

//求和结果

Stringname="

"

;

//数列类别

publicvoidsetFirstItem(doublea)

{firstItem=a;

}

publicdoublegetFirstItem()

{returnfirstItem;

publicvoidsetVar(doubleb)

{var=b;

publicdoublegetVar()

{returnvar;

publicvoidsetNumber(intn)

{number=n;

publicdoublegetNumber()

{returnnumber;

publicvoidsetSum(doubles)

{sum=s;

publicdoublegetSum()

{returnsum;

publicvoidsetName(Stringna)

{name=na;

publicStringgetName()

{returnname;

}

二、视图

inputMess.jsp

%@pagecontentType="

text/html;

Charset=GB2312"

%>

HTML>

BODY>

Fontsize=2>

FORMaction="

lookSum"

Method="

post"

>

等差数列求和:

BR>

输入首项:

Inputtype=textname="

firstItem"

size=4>

输入公差:

var"

求和项数:

number"

Inputtype=submitvalue="

提交"

/FORM>

get"

等比数列求和:

输入公比:

/Font>

/BODY>

/HTML>

showResult.jsp

charset=GB2312"

%@pageimport="

moon.yourbean.*"

%>

jsp:

useBeanid="

lie"

type="

moon.yourbean.Series"

scope="

request"

/>

BODY>

Tableborder=1>

tr>

th>

数列的首项<

/th>

getPropertyname="

property="

name"

所求项数<

求和结果<

/tr>

td>

/td>

sum"

/Table>

三、控制器

HandleSum.java

packagesun.yourservlet;

importmoon.yourbean.*;

importjava.io.*;

importjavax.servlet.*;

importjavax.servlet.http.*;

publicclassHandleSumextendsHttpServlet

{publicvoidinit(ServletConfigconfig)throwsServletException

{super.init(config);

publicvoiddoPost(HttpServletRequestrequest,HttpServletResponseresponse)

throwsServletException,IOException

{Seriesshulie=newSeries();

//创建Javabean对象

request.setAttribute("

shulie);

//将shulie存储到HttpServletRequest对象中

doublea=Double.parseDouble(request.getParameter("

));

doubled=Double.parseDouble(request.getParameter("

intn=Integer.parseInt(request.getParameter("

shulie.setFirstItem(a);

//将数据存储在shulie中

shulie.setVar(d);

shulie.setNumber(n);

//计算和:

doublesum=0,item=a;

inti=1;

shulie.setName("

等差数列的公差"

);

while(i<

=n)//计算等差数列的和

{sum=sum+item;

i++;

item=item+d;

shulie.setSum(sum);

RequestDispatcherdispatcher=request.getRequestDispatcher("

showResult.jsp"

dispatcher.forward(request,response);

//请求showResult.jsp显示shulie中的数据

}

publicvoiddoGet(HttpServletRequestrequest,HttpServletResponseresponse)

等比数列的公比"

=n)//计算等比数列的和

item=item*d;

实例二、数据库查询操作

ShowRecordByPage.java

importcom.sun.rowset.*;

publicclassShowRecordByPage

{CachedRowSetImplrowSet=null;

//存储表中全部记录的行集对象

intpageSize=10;

//每页显示的记录数

intpageAllCount=0;

//分页后的总页数

intshowPage=1;

//当前显示页

StringBufferpresentPageResult;

//显示当前页内容

StringdatabaseName="

//数据库名称

StringtableName="

//表的名字

StringBufferformTitle=null;

//表头

publicvoidsetRowSet(CachedRowSetImplset)

{rowSet=set;

publicCachedRowSetImplgetRowSet()

{returnrowSet;

publicvoidsetPageSize(intsize)

{pageSize=size;

publicintgetPageSize()

{returnpageSize;

publicintgetPageAllCount()

{returnpageAllCount;

publicvoidsetPageAllCount(intn)

{pageAllCount=n;

publicvoidsetShowPage(intn)

{showPage=n;

publicintgetShowPage()

{returnshowPage;

publicvoidsetPresentPageResult(StringBufferp)

{presentPageResult=p;

publicStringBuffergetPresentPageResult()

{returnpresentPageResult;

publicvoidsetDatabaseName(Strings)

{databaseName=s.trim();

publicStringgetDatabaseName()

{returndatabaseName;

publicvoidsetTableName(Strings)

{tableName=s.trim();

publicStringgetTableName()

{returntableName;

publicvoidsetFormTitle(StringBuffers)

{formTitle=s;

publicStringBuffergetFormTitle()

{returnformTitle;

choiceDatabase.jsp

helpReadRecord"

method="

name="

form"

输入SQlServer2000所管理的数据库的名字(例如:

pubs、factory):

INPUTtype="

text"

databaseName"

输入相应数据库中表的名字(例如:

jobs、employee):

tableName"

输入每页显示的记录数:

value="

2"

pageSize"

size=6>

submit"

showRecord.jsp

database"

moon.yourbean.ShowRecordByPage"

session"

您查询的数据库:

查询的表:

记录分<

pageAllCount"

页,

每页最多显示<

条记录,

目前显示第<

showPage"

页。

tableborder=1>

formTitle"

presentPageResult"

/table>

table>

hidden"

previousPage"

whichPage"

上一页"

nextPage"

下一页"

HandleDatabase.java

importjava.sql.*;

publicclassHandleDatabaseextendsHttpServlet

{int字段个数;

CachedRowSetImplrowSet=null;

publicvoidinit(ServletConfigconfig)throwsServletException

{super.init(config);

try{Class.forName("

com.microsoft.sqlserver.jdbc.SQLServerDriver"

catch(Exceptione){}

{Connectioncon;

StringBufferpresentPageResult=newStringBuffer();

ShowRecordByPagedatabaseBean=null;

HttpSessionsession=request.getSession(true);

try{databaseBean=(ShowRecordByPage)session.getAttribute("

if(databaseBean==null)

{databaseBean=newShowRecordByPage();

session.setAttribute("

databaseBean);

catch(Exceptionexp)

StringdatabaseName=request.getParameter("

StringtableName=request.getParameter("

Stringps=request.getParameter("

if(ps!

=null)

{try{intmm=Integer.parseInt(ps);

databaseBean.setPageSize(mm);

catch(NumberFormatExceptionexp)

{databaseBean.setPageSize

(1);

intshowPage=databaseBean.getShowPage();

intpageSize=databaseBean.getPageSize();

booleanboo=databaseName!

=null&

&

tableName!

databaseName.length()>

0&

tableName.length()>

0;

if(boo)

{databaseBean.setDatabaseName(databaseNam

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