l常看见jsp版里有h问时间操作的问题Q这些问题一般包括：取当前时_把一个指定的字符串时间{化成旉cdQ求两个旉之间的天敎ͼ求一D|间以前的旉Q求一D|间以后的旉Q在q里把q些问题汇M下?br /><%@ page contentType="text/html;charset=gb2312"%>
<%@ page import="java.text.*"%>
<%@ page import="java.util.*"%>
<%
//字符串{化成旉cdQ字W串可以是Q意类型，只要和SimpleDateFormat中的格式一致即可）
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("M/dd/yyyy hh:mm:ss a",java.util.Locale.US);
java.util.Date d = sdf.parse("5/13/2003 10:31:37 AM");
out.println(d);
out.println("<br>");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String mDateTime1=formatter.format(d);
out.println(mDateTime1);
out.println("<br>");
out.println(d.getTime());
out.println("<br>");
//当前旉
Calendar cal = Calendar.getInstance();
// SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss G E D F w W a E F");
String mDateTime=formatter.format(cal.getTime());
out.println(mDateTime);
out.println("<br>");
//1q前日期
java.util.Date myDate=new java.util.Date();
long myTime=(myDate.getTime()/1000)-60*60*24*365;
myDate.setTime(myTime*1000);
String mDate=formatter.format(myDate);
out.println(mDate);
out.println("<br>");
//明天日期
myDate=new java.util.Date();
myTime=(myDate.getTime()/1000)+60*60*24;
myDate.setTime(myTime*1000);
mDate=formatter.format(myDate);
out.println(mDate);
out.println("<br>");
//两个旉之间的天?br />SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");
java.util.Date date= myFormatter.parse("2003-05-1");
java.util.Date mydate= myFormatter.parse("1899-12-30");
long day=(date.getTime()-mydate.getTime())/(24*60*60*1000);
out.println(day);
out.println("<br>");
//加半时
SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
java.util.Date date1 = format.parse("2002-02-28 23:16:00");
long Time=(date1.getTime()/1000)+60*30;
date1.setTime(Time*1000);
String mydate1=formatter.format(date1);
out.println(mydate1);
out.println("<br>");
//q月周求日期
SimpleDateFormat formatter2 = new SimpleDateFormat("yyyy-MM F E");
java.util.Date date2= formatter2.parse("2003-05 5 星期?);
SimpleDateFormat formatter3 = new SimpleDateFormat("yyyy-MM-dd");
String mydate2=formatter3.format(date2);
out.println(mydate2);
out.println("<br>");
//求是星期?br />mydate= myFormatter.parse("2001-1-1");
SimpleDateFormat formatter4 = new SimpleDateFormat("E");
String mydate3=formatter4.format(mydate);
out.println(mydate3);
out.println("<br>");
%>
]]>
问题描述:在用hibernate作ؓ数据持久层的ҎӞ照样会遇C文问题，具体情况时插入到数据库中的汉字显CZؓ??Q显C数据时汉字??
探烦: l过试验发现与汉字编码有关的地方有以下两处，一个是数据库连接url Q一个是~程时获取Configuration cȝ实例的语句的方式?br />Ҏ1:
* ~程时获取Configuration cȝ实例的语句ؓ
* new Configuration().addClass(xx.class);
必须在hibernate.properties文g里数据库q接url后加?characterEncoding=gbk&useUnicode=true
Ҏ2:
* ~程时获取Configuration cȝ实例的语句ؓ
* new Configuration().configure().
在hibernate.cfg.xml文g?lt;session-factory/>块中讄
<property name="connection.useUnicode">true</property>
<property name="connection.characterEncoding">UTF-8</property>
或编E时?
Properties extraProperties = new Properties();
extraProperties.put("hibernate.connection.useUnicode", "true");
extraProperties.put("hibernate.connection.characterEncoding", "UTF-8");
myConfiguration.addProperties(extraProperties);
原来怀疑与xml面的编码有兌了一下，好像不v作用?br />
]]>
q个问题让我郁闷了两三天旉,最后才发现问题是在JSP端?<html:form action="/uploadsAction" enctype="multipart/form-data" >
标签如果了" enctype="multipart/form-data" 服务器就会报?
下面把代码脓出来.
JSP?br /> <html:errors />
<html:form action="/uploadsAction" enctype="multipart/form-data" >
<html:file property="theFile" />
<html:radio property="upType" value="a" />CSVFileReader
<html:radio property="upType" value="b" />FileUp
<html:submit value="OK" />
</html:form>
FormBean中将属性定义ؓFormFile,geter seter Ҏ依旧.
Action 中的代码如下:实现图片上传至UPLOAD文g夹内 如果文g大于20K或是宽＆高超q规定范围的,会重新勾?实现对上传图片的控制.
当然q只是测试Action没有跌{面..
package upload;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.Action;
import org.apache.struts.upload.*;
import java.io.IOException;
import java.awt.Image;
import java.awt.image.BufferedImage;
import com.sun.image.codec.jpeg.JPEGImageEncoder;
import com.sun.image.codec.jpeg.JPEGCodec;
import java.io.File;
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
public class UploadAction extends Action {
public ActionForward execute(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest servletRequest,
HttpServletResponse servletResponse)throws Exception {
System.out.println("asdasdasdasdasdasd");
UploadForm uploadForm = (UploadForm) actionForm;
FormFile pic = uploadForm.getPic();
String picname = pic.getFileName();
String uploadFileName = servletRequest.getSession()
.getServletContext()
.getRealPath("upload")+"\\"+picname;
File upliadFile = new File(uploadFileName);
BufferedInputStream bis = null;
Image image = null;
BufferedOutputStream bos = null;
try{
if(pic.getFileSize()<2*1024*1024){
bis = new BufferedInputStream(pic.getInputStream());
image = javax.imageio.ImageIO.read(bis);
int width = image.getWidth(null);
int height = image.getHeight(null);
int w = 160;
int h = 120;
if(width>w||height>h){
BufferedImage bi = new BufferedImage(w,h,
BufferedImage.TYPE_INT_RGB);
bi.getGraphics().drawImage(image,0,0,w,h,null);
bos = new BufferedOutputStream(new FileOutputStream(
upliadFile));
JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(bos);
encoder.encode(bi);
System.out.println(width * height);
}else{
bos = new BufferedOutputStream(new FileOutputStream(upliadFile));
byte[] date = new byte[5*1024];
int len = bis.read(date);
while (len!=-1){
bos.write(date);
len = bis.read(date);
}
}
}
return actionMapping.findForward("ok");
}catch(Exception e){
e.printStackTrace();
} finally {
try {
if (bis != null)
bis.close();
} catch (IOException e1) {
e1.printStackTrace();
}
try {
if (bos != null)
bos.close();
} catch (IOException e2) {
e2.printStackTrace();
}
}
return actionMapping.findForward("ok");
}
}
]]>
配置q程Q?/p>
一、下载必要的jar包。有四个包要下蝲Q网上有贴子说只要下面前三个包就可以了，但我在配|的时候如果没有第四个包会报错Q?br />http://apache.linuxforum.net/dist/jakarta/commons/dbcp/binaries/commons-dbcp-1.2.zip
http://apache.linuxforum.net/dist/jakarta/commons/pool/binaries/commons-pool-1.2.zip
http://apache.linuxforum.net/dist/jakarta/struts/struts-legacy/struts-legacy-1.0.zip
http://apache.linuxforum.net/dist/jakarta/commons/collections/binaries/commons-collections-3.1.zip
把这四个jar包放到web应用的WEB-INF/lib目录下，q有要把MySQL的驱动程序包也放到这里（也可以把数据库的驱动包放?Tomcat_Home%/common/lib目录下或%Resin_Home%/lib目录下，q样在启动Web服务器的时候就会加载这个包Q服务器和Web应用都可以用驱动程序类Q?/p>
二、在struts-config.xml中添加Data Source。MyEclipse的Design模式下可以可视化地编辑struts-config.xml和添加Data SourceQ但它在struts-config.xml中生成的数据源的代码是错误的Q就是因个耽误了我很多旉Q?br />我们手工~辑代码Q?/p>
<data-sources>
<data-source key="datasource" type="org.apache.commons.dbcp.BasicDataSource">
<set-property property="password" value="admin" />
<set-property property="minCount" value="3" />
<set-property property="maxCount" value="10" />
<set-property property="username" value="admin" />
<set-property property="driverClassName" value="com.mysql.jdbc.Driver" />
<set-property property="description" value="test" />
<set-property property="url" value="jdbc:mysql://localhost/test" />
<set-property property="readOnly" value="false" />
<set-property property="autoCommit" value="true" />
</data-source>
</data-sources>
如果要配|多个data sourceQ可以给每个data source指定不同的keyQ然后在E序中根据key指定要引用的数据源?/p>
三、测试数据源。配|好以后可以在ActionServlet中用了?/p>
DataSource ds = getDataSource(request,"datasource");
Connection conn = ds.getConnection();
Statement stmt = conn.createStatement();
ResultSet rs = stmt.executeQuery("SQL String");
附： Struts1.1中struts-config.xml的配|：
<data-sources >
<data-source key="datasource" type="org.apache.struts.util.GenericDataSource">
<set-property property="password" value="admin" />
<set-property property="minCount" value="2" />
<set-property property="maxCount" value="10" />
<set-property property="user" value="admin" />
<set-property property="driverClass" value="com.mysql.jdbc.Driver" />
<set-property property="description" value="test" />
<set-property property="url" value="jdbc:mysql://localhost/test" />
<set-property property="readOnly" value="false" />
<set-property property="autoCommit" value="true" />
</data-source>
</data-sources>
注意Q蓝色字体的部分?.1?.2在配|上不一L地方?br />
]]>
一?开发环?br />
我的开发环境是QJBuilder x + Weblogic 8.1 + Oracle 9i + Windows 2003 Q如果朋友们的开发环境不一样亦无妨?br />
二、开发思\
既然讲的是StrutsQ那自然M了MVCQ分|CZ是如此?br />
1?建立数据库和对应的表Q本例的表是TCertificate?br />
2?建立适当的模型组Ӟ对应你要查询数据库中的表。这部分由DAO数据讉K层来实现Q如果有的朋友对DAO不熟悉可以查询一下相兌料。本例由CertificateDAO.java来实现?br />
3 、徏立分|需要的模型lgQ由javaBean来充当，q与CertificateDAO实现分离。网上介l的很多ҎQ都存在着数据与分늻件藕合的现象Q这也是本方法与其它分页Ҏ的主要不同之处?br />
4、徏立控制器lgQ这部分由Struts 中的Action来实现。主要负责将实例化CertificateDAOQ只取要昄的数据记录，存入ArrayList对象然后q回Qƈ攑ֈ request中。而分部分则Ҏ分页条gQ单独进行构造，避免了与DAO混在一L情况发生。网上其它介l的一些分|法中Q基本上都是一ơ性读出所有查询的数据Q然后再由分늛关组件进行构造。这P如果数据量大的话Q很Ҏ形成瓉。在本例中由于不是一ơ性地d查询的所有数据，而只是读Z个页面要昄的数据记录，q就节省了很多不必要的数据传输，提高了效率。本例中为CertificateAction.java?br />
5、徏立视囄Ӟq部分由jsp来充当，Z不出现java 代码Q我们用Struts提供的标{ֺQ主要负责从request中取出刚刚放入的对象Q通过反复调用CertificateAction以及 action参数Q而实现分|C。本例中为listcertificate.jsp?br />
6?建立q|struts-config.xml?br />
三、实例代?br />
定好上面的开发思\后，代码的实现就有单可@了?br />
1、徏数据库和相应的表?br />
2、数据逻辑层的相关代码?br />
1Q、通用的DAOc：CommonDAO.java
q是一个很多DAO都要l承到的通用DAOc，是我Ҏ实践ȝ出来的，Z减少幅Q这里只昄和本例相关的代码?br />
java代码:
代码Q?br /> --------------------------------------------------------------------------------
package com.xindeco.business ;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import java.lang.IllegalAccessException;
import java.lang.reflect.InvocationTargetException;
import org.apache.commons.beanutils.BeanUtils;
public class DAO
{
protected DataSource ds;
/**
* 说明:取得当前查询的总记录数
*/
public int getRows ()
{
return this.count;
}
public void rsHandler (ResultSet rs, int offset, int limit)
{
try
{
count = 0;
rs.absolute ( -1) ;
count = rs.getRow () ;
if (offset <= 0)
{
rs.beforeFirst () ;
}
else
{
rs.absolute (offset) ;
}
}
catch (Exception e)
{
e.printStackTrace () ;
}
}
public DAO(DataSource ds) {
this.ds = ds;
}
public void setDataSource(DataSource ds) {
this.ds = ds;
}
protected void close(ResultSet rs) {
if (rs != null) {
try {
rs.close();
} catch (SQLException e) {
}
rs = null;
}
}
protected void close(PreparedStatement pstmt) {
if (pstmt != null) {
try {
pstmt.close();
} catch (SQLException e) {
}
pstmt = null;
}
}
protected void close(Connection conn) {
if (conn != null) {
try {
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
conn = null;
}
}
protected void rollback(Connection conn) {
if (conn != null) {
try {
conn.rollback();
} catch (SQLException e) {
e.printStackTrace();
}
conn = null;
}
}
}
q个cM要是通过子类传进来的先进l果集，取得查询的记录LQƈҎ据库q接q行单的理?br />
2Q、对数据库进行访问：CertificateDAO.java
java代码:
代码Q?br /> --------------------------------------------------------------------------------
package com.xindeco.business;
import java.io.*;
import java.sql.*;
import java.util.*;
import javax.sql.*;
import com.xindeco.common.dbconn.DbConn;
public class CertificateDAO extends DAO
{
public NationDAO(DataSource ds) {
super(ds);
}
public List findCertificateList(int offset,int limit) throws SQLException
{
int countRows = 0 ;
ArrayList list = null ;
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
try
{
conn = ds.getConnection();
String sql =
"SELECT certificateID, certificateCode,certificateName,photoURL,"
+ "description,graduateID FROM TCertificate " ;
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
/*Ҏ标进行处理，rsHandler Ҏ在父cDAO?/
this.rsHandler(rs,offset,limit);
if (rs != null && rs.next ())
{
list = new ArrayList () ;
do
{
countRows++ ;
list.add (rs2VO (rs)) ;
}
while ( (countRows++ < limit) && rs.next ()) ;
}
close(rs);
close(pstmt);
} catch (SQLException e) {
close(rs);
close(pstmt);
rollback(conn);
e.printStackTrace();
}
finally {
close(conn);
}
return list ;
}
private CertificateVO rs2VO (ResultSet rs)
{
try
{
CertificateVO certificateVO = new CertificateVO () ;
certificateVO.setCertificateID (rs.getInt ("certificateID")) ;
certificateVO.setCertificateCode (rs.getString ("certificateCode")) ;
certificateVO.setCertificateName (rs.getString ("certificateName")) ;
certificateVO.setPhotoURL (rs.getString ("photoURL")) ;
certificateVO.setDescription (rs.getString ("description")) ;
certificateVO.setGraduateID (rs.getInt ("graduateID")) ;
return certificateVO ;
}
catch (Exception ex)
{
ex.printStackTrace () ;
return null ;
}
}
}
findCertificateList(int offset,int limit)是查得所有要昄的数据，q放入ArrayList中。看q网上有些例子，把数据记录放入ArrayList的动作过E直接在while循环体里完成Q如果字D多的话Q会造成Ҏq于宠大Q又不美观。这里，数据记录攑օArrayList的动作过E由rs2VOҎ完成Q就比较整洁了。另外，if (rs != null && rs.next ()) 配合while ( (countRows++ < limit) && rs.next ()) 是ؓ了程序的健壮性考虑的，E分析一下不隑־出结论?br />
3、徏立控制器lgQCertificateAction.java
java代码:
代码Q?br /> --------------------------------------------------------------------------------
package com.xindeco.presentation;
import javax.sql.* ;
import java.util.* ;
import javax.servlet.http.* ;
import javax.servlet.* ;
import org.apache.struts.action.* ;
import org.apache.struts.util.* ;
import com.xindeco.common.Pager;
import com.xindeco.business.graduatedata.CertificateDAO ;
public class CertificateAction
extends Action
{
private static final int PAGE_LENGTH = 5 ; //每页昄5条记?br /> public ActionForward execute (ActionMapping mapping, Actionform form,
HttpServletRequest request,
HttpServletResponse response)
{
ActionForward myforward = null ;
String myaction = mapping.getParameter () ;
if (isCancelled (request))
{
return mapping.findForward ("failure") ;
}
if ("".equalsIgnoreCase (myaction))
{
myforward = mapping.findForward ("failure") ;
}
else if ("LIST".equalsIgnoreCase (myaction))
{
myforward = performList (mapping, form, request, response) ;
}
else
{
myforward = mapping.findForward ("failure") ;
}
return myforward ;
}
private ActionForward performList (ActionMapping mapping,
Actionform actionform,
HttpServletRequest request,
HttpServletResponse response)
{
try
{
DataSource ds = (DataSource) servlet.getServletContext().getAttribute(Action.DATA_SOURCE_KEY);
CertificateDAO certificateDAO = new CertificateDAO (ds) ;
int offset = 0; //页时的起始记录所在游?br /> int length = PAGE_LENGTH;
String pageOffset = request.getParameter("pager.offset");
if (pageOffset == null || pageOffset.equals("")) {
offset = 0;
} else {
offset = Integer.parseInt(pageOffset);
}
List certificateList = certificateDAO .findCertificateList (offset,length) ;
int size = certificateDAO.getRows(); // 取得总记录数
String url = request.getContextPath()+"/"+mapping.getPath()+".do";
String pagerHeader = Pager.generate(offset, size, length, url); //分页处理
request.setAttribute ("pager", pagerHeader) ;
request.setAttribute ("list", certificateList) ;
}
catch (Exception e)
{
e.printStackTrace();
return mapping.findForward ("error") ;
}
return mapping.findForward ("success") ;
}
}
CertificateAction.java主要是把数据从DAO中取出，q放入一个ArrayList 中，然后通过配置文g再Y件View的JSPc?br />
5、徏立视图listcertificate.jsp文g?br />
jsp代码:
代码Q?br /> --------------------------------------------------------------------------------
<%@ page contentType="text/html; charset=GBK" %>
<%@ taglib uri="/WEB-INF/struts-template.tld" prefix="template" %>
<%@ taglib uri="/WEB-INF/struts-html.tld" prefix="html" %>
<%@ taglib uri="/WEB-INF/struts-bean.tld" prefix="bean" %>
<%@ taglib uri="/WEB-INF/struts-logic.tld" prefix="logic" %>
<table bgcolor="#666666" cellpadding="1" cellspacing="0" border="0" width="500">
<tr>
<td>
<table cellpadding="0" cellspacing="0" border="0" width="500">
<tr>
<td bgcolor="#fecc51">&</td>
</tr>
</table>
</td>
</tr>
<tr>
<td>
<table cellpadding="0" cellspacing="0" border="0" width="500">
<tr>
<td bgcolor="#d6e0ed">
&&<bean:message key="label.list4certificate"/>
</td>
</tr>
<tr bgcolor="#FFFFFF">
<td width="5%"></td><td width="19%"></td><td width="76%"></td>
</tr>
<tr>
<td>
<table bgcolor="#f2f2f2" width="500" cellspacing="0" border="0">
<tr bgcolor="#bacce1">
<td><b><bean:message key="Certificate.select"/> </b></td>
<td><b><bean:message key="Certificate.certificateID"/> </b></td>
<td><b><bean:message key="Certificate.certificateCode"/></b></td>
<td><b><bean:message key="Certificate.certificateName"/></b></td>
<td><b><bean:message key="Certificate.view"/></b></td>
</tr>
<bean:write name="pager" property="description"/>
<logic:equal name="pager" property="hasPrevious" value="true">
<a href="/graduatedata/list.do?viewPage=<bean:write name="pager" property="previousPage"/>" class="a02">
Previous
</a>
</logic:equal>
<logic:equal name="pager" property="hasNext" value="true">
<a href="/graduatedata/list.do?viewPage=<bean:write name="pager" property="nextPage"/>" class="a02">
Next
</a>
</logic:equal>
<logic:notEmpty name="list" scope="request">
<logic:iterate id="certificate" name="list" type="com.xindeco.business.graduatedata.CertificateVO"scope="request">
<tr bgcolor="#FFFFFF">
<td><html:text property="name" value="<bean:write name="certificate" property="certificateID" scope="page"/>"/>
</td>
<td> <bean:write name="certificate" property="certificateID" scope="page"/></td>
<td> <bean:write name="certificate" property="certificateCode" scope="page"/></td>
<td> <bean:write name="certificate" property="certificateName" scope="page"/></td>
<td> <bean:write name="certificate" property="photoURL" scope="page"/></td>
</tr>
</logic:iterate>
</logic:notEmpty>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
6、对应的配置文gstruts-config.xml?br />
java代码:
代码Q?br /> --------------------------------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.1//EN" " <struts-config>
<form-beans>
<form-bean name="certificateform" type="com.xindeco.presentation.graduatedata.Certificateform" />
</form-beans>
<global-forwards>
<forward name="error" path="/error/error.jsp" />
</global-forwards>
<action-mappings>
<action name="certificateform" parameter="LIST" path="/graduatedata/list" scope="request" type="com.xindeco.presentation.graduatedata.CertificateAction" validate="true">
<forward name="success" path="/graduatedata/listcertificate.jsp" />
</action>
</action-mappings>
…?br /> </struts-config>
7、最后当然是最重要的分代码了QPager.java
java代码:
代码Q?br /> --------------------------------------------------------------------------------
package com.xindeco.common;
import java.util.* ;
public class Pager {
private static int MAX_PAGE_INDEX = 10; //脚昄多少?br /> private static String HEADER = "Result page";
public static String generate(int offset, int length, int size, String url) {
if (length > size) {
String pref;
if (url.indexOf("?") > -1) {
pref = "&";
} else {
pref = "?";
}
String header = "<font face='Helvetica' size='-1'>"+HEADER+": ";
if (offset > 0) {
header += "&<a href=\""+url+pref+"pager.offset="+(offset-size)+"\">[<< Prev]</a>\n";
}
int start;
int radius = MAX_PAGE_INDEX/2*size;
if (offset < radius) {
start = 0;
} else if(offset < length-radius) {
start = offset - radius;
} else {
start = (length/size-MAX_PAGE_INDEX)*size;
}
for(int i=start;i<length && i < start + MAX_PAGE_INDEX*size;i+=size) {
if (i == offset) {
header += "<b>"+(i/size+1)+"</b>\n";
} else {
header += "&<a href=\""+url+pref+"pager.offset="+i+"\">"+(i/size+1)+"</a>\n";
}
}
if(offset < length - size) {
header += "&<a href=\""+url+pref+"pager.offset="+((int)offset+(int)size)+"\">[Next >>]</a>\n";
}
header += "</font>";
return header;
} else {
return "";
}
}
}
q部分代码的实现相当z，但已l够完成所需了?
]]>
q仅是一个入门实例，z实用，从网上整理而来Q供参考。这里仅列出部分文gQ其它文件、数据库及目录结构请从本站下载?
一、struts-config.xml配置Q主要是配数据库,q里用access?
<?xml version="1.0" encoding="ISO-8859-1" ?>
<!DOCTYPE struts-config PUBLIC
</data-sources> <action-mappings> <controller> 二、Actionc? package page; import java.util.*; public class DataSourceAction extends Action { public DataSourceAction(){} // if there is a previous page, set the previous variable // if there is a next page, set the next variable }catch(SQLException e){
public int getId(){ public String getAuthor() { public void setAuthor(String author) { public String getBookname() { public void setBookname(String bookname) { <logic:iterate id="book" name="list" type="bean.Book"> <form action="/TestPage/page.do"> <logic:present name="next"> 每页<c:out value="${page}"/>条记??lt;c:out value="${pages}"/>?跛_<input type="text" name="go" size="3" maxlength="30" > OK!!!!
"-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
"
<struts-config>
<data-sources>
<data-source key="dataSource" type="org.apache.commons.dbcp.BasicDataSource">
<set-property property="driverClassName" value="sun.jdbc.odbc.JdbcOdbcDriver" />
<set-property property="url" value="jdbc:odbc:page" />
<set-property property="username" value="admin" />
<set-property property="password" value="" />
<set-property property="maxActive" value="20" />
<set-property property="maxWait" value="5000" />
<set-property property="defaultAutoCommit" value="true" />
<set-property property="defaultReadOnly" value="false" />
<set-property property="validationQuery" value="SELECT 1" />
<set-property property="removeAbandoned" value="true" />
<set-property property="removeAbandonedTimeout" value="120" />
<set-property property="encoding" value="false" />
</data-source>
<form-beans>
</form-beans>
<global-forwards>
</global-forwards>
<action path="/page" type="page.DataSourceAction" scope="request">
<forward name="success" path="/pagetest.jsp"/>
</action>
</action-mappings>
</controller>
</struts-config>
?page.do?start=1 来显C第一个页面?
参数说明Q?
listQ信息列表?
startQ开始位|?
pageQ每|C的信息数目
pages: 总页?
previousQ上开始位|?
nextQ下开始位|?
import org.apache.struts.action.*;
import javax.servlet.http.*;
import javax.sql.*;
import java.sql.*;
import bean.*;
public ActionForward execute(ActionMapping mapping, ActionForm form, HttpServletRequest request,
HttpServletResponse response) throws Exception {
try{
DataSource ds=this.getDataSource(request,"dataSource");
Connection con = ds.getConnection();
Statement stmt = con.createStatement();
ResultSet resultSet = stmt.executeQuery("select count(*) from book" );
resultSet.next();
int data_num=resultSet.getInt(1);
int start=1;
int page = 4; //每页的记录数?
int pages=data_num/page;
if(data_num%page!=0)
pages++;
if(request.getParameter("start")!=null)
start = Integer.parseInt(request.getParameter("start"));
if(request.getParameter("go")!=null){
int go = Integer.parseInt(request.getParameter("go"));
if(go<=1)
start=1;
else if(go>pages)
start=(pages-1)*page+1;
else
start=(go-1)*page+1;
}
String sql = "SELECT * FROM book where id>="+start+" and id<"+(start+page);
resultSet = stmt.executeQuery(sql);
ArrayList list = new java.util.ArrayList();
while(resultSet.next())
{
int id=resultSet.getInt("id");
String name = resultSet.getString("name");
String author = resultSet.getString("author");
String price = resultSet.getString("price");
System.out.println("开始数据封装：name="+name+"author="+author+"price="+price);
Book book= new Book(id,name,author,price);
list.add(book);
}
con.close();
request.setAttribute("pages",new Integer(pages));
request.setAttribute("list",list);
//request.setAttribute("start", new Integer(start));
request.setAttribute("page", new Integer(page));
int previous = start-page;
if ( previous>=0 ){
request.setAttribute("previous", new Integer(previous));
System.out.println ("previous:" + previous);
}
int next = start+page;
if ( next<=data_num ){
request.setAttribute("next", new Integer(next));
System.out.println ("next:" + next);
}
e.printStackTrace();
System.out.println("数据库连接出现异?);
}
return (mapping.findForward("success"));
}
}
三、beancBook.java
package bean;
import java.sql.*;
import java.util.ArrayList;
public class Book {
int id;
private String bookname; //书名
private String author; //作?
private String price; //h
public Book(int id,String name,String author,String price){
this.id=id;
this.bookname=name;
this.author=author;
this.price=price;
}
return id;
}
return author;
}
this.author = author;
}
return bookname;
}
this.bookname = bookname;
}
public String getPrice(){
return this.price;
}
public void setPrice(String price){
this.price=price;
}
}
四、分늚jsp面pagetest.jsp,用了jstl中的c标记?
<%@ page contentType="text/html; charset=gb2312" language="java"%>
<%@ page import="java.util.*" %>
<%@ page import="bean.*" %>
<%@ taglib prefix="c" uri="<%@ taglib uri="/tags/struts-bean" prefix="bean" %>
<%@ taglib uri="/tags/struts-html" prefix="html" %>
<%@ taglib uri="/tags/struts-logic" prefix="logic" %>
<br><html:link
paramId="id" paramName="book" paramProperty="id"
page="/messagedetail.do">
<bean:write name="book" property="bookname" />
</html:link>
</logic:iterate>
<logic:present name="previous">
<html:link
paramId="start" paramName="previous"
page="/page.do">
上一?
</html:link>
</logic:present>
<html:link
paramId="start" paramName="next"
page="/page.do">
下一?
</html:link>
</logic:present>
<input type="submit" value="go" >
</form>
五、测试，请下载本实例的目录结构TestPage,攑օtomcat的webapps下，在浏览器中输入：
http://127.0.0.1:8080/TestPage/page.do
来源Q?java学习?br />
]]>
]]>
Jsp上传面Q?
<%@ page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>
strutsUploadForm
</title>
</head>
<body bgcolor="#ffffff">
<h1>
上传试
</h1>
<form action="uploadTestAction.do" method="post" enctype="multipart/form-data" name="form1">
<p>文本
<input name="theText" type="text" id="theText">
</p>
<p>文g
<input name="theFile" type="file" id="theFile">
</p>
<p>保存?
<input name="saveTo" type="text" id="saveTo">
</p>
<p>
<input type="submit" name="Submit" value="提交">
</p>
</form>
</body>
</html>
actionForm
package hehe;
import org.apache.struts.action.*;
import javax.servlet.http.*;
import org.apache.struts.upload.FormFile;
public class UploadTestForm extends ActionForm {
private String saveTo;
private String theText;
private org.apache.struts.upload.FormFile theFile;//文g框对应的是formFilecd
public String getSaveTo() {
return saveTo;
}
public void setSaveTo(String saveTo) {
this.saveTo = saveTo;
}
public org.apache.struts.upload.FormFile getTheFile() {
return theFile;
}
public void setTheFile(org.apache.struts.upload.FormFile theFile) {
this.theFile = theFile;
}
public String getTheText() {
return theText;
}
public void setTheText(String theText) {
this.theText = theText;
}
public ActionErrors validate(ActionMapping actionMapping, HttpServletRequest httpServletRequest) {
/**@todo: finish this method, this is just the skeleton.*/
if(!this.getTheFile().getContentType().equals("image/pjpeg")){
System.out.println("不是jpg");
}//可以判断cd
if(this.getTheFile().getFileSize()>100){
System.out.println("长度大于1000");
}//可以判断大小
return null;
}
public void reset(ActionMapping actionMapping, HttpServletRequest httpServletRequest) {
saveTo = null;
theFile = null;
theText = null;
}
}
Action
package hehe;
import org.apache.struts.action.*;
import org.apache.struts.upload.FormFile;
import javax.servlet.http.*;
import java.io.*;
public class UploadTestAction
extends Action {
public ActionForward execute(ActionMapping actionMapping,
ActionForm actionForm,
HttpServletRequest request,
HttpServletResponse response) {
UploadTestForm uploadForm = (UploadTestForm) actionForm;
FormFile file = uploadForm.getTheFile();
String path = uploadForm.getSaveTo();
String theText = uploadForm.getTheText();
try {
InputStream input = file.getInputStream();//能从FormFile中获得输入流
OutputStream output = new FileOutputStream(path);
int bytesReader = 0;
byte[] readbuffer = new byte[8192];
while ( (bytesReader = input.read(readbuffer, 0, 8192)) != -1) {
output.write(readbuffer, 0, bytesReader);
}
output.close();
}
catch (Exception e) {
e.printStackTrace();
}
request.setAttribute("theText", theText);
request.setAttribute("fileName", file.getFileName());//上传的文件名
request.setAttribute("fileSize", new Integer(file.getFileSize()));//文g大小
request.setAttribute("fileType", file.getContentType());//文gcd
return actionMapping.findForward("success");
}
}
l果面
<%@ page contentType="text/html; charset=GBK" %>
<html>
<head>
<title>
strutsUploadResult
</title>
</head>
<body bgcolor="#ffffff">
<h1>
上传l果
</h1>
文g名：<%=request.getAttribute("fileName")%><br />
文本Q?lt;%=request.getAttribute("theText")%><br />
文gcdQ?lt;%=request.getAttribute("fileType")%><br />
文g大小Q?lt;%=request.getAttribute("fileSize")%><br />
</body>
</html>
]]>
首先在资源文件中定义错误信息和普通信?/span> . ?/span> :MessageResources.properties 中定义如?/span> :
|
java
代码
:
|
|
|
在程序中定义错误和信息类
,
q个例子写在
JSP
?/span>
|
java
代码
:
|
|
|
昄错误
:
|
java
代码
:
|
|
|
昄信息
:
|
java
代码
:
|
|
|
]]>
1.若明参数名和参数值则直接在URI后输出，
如：<html:link page="/test.do?action=add">add</html:link>
2.对于参数g定的，paramName和paramProperty来输出，用paramId属性指定参数名?br />对于paramName指定的对象应该存在于page、request、session、application其中之一。一般来_是从ActioncMq来的，作ؓrequest的属性之一Qrequst.setAttribute("name",object)Q?br />如果paramName指定的对象是action的ActionFormQ则无需使用request.setAttributeҎ?br />例：<html:link page="/test.do" paramId="userid" paramName="uid">uname</html:link>
若参数值是一个bean对象的属性|比如ActionForm,或者集合中存放的对象）则：
<html:link page="/test.do" paramId="userid" paramName="user" paramProperty="uid">uname</html:link>
3.若两个参敎ͼ一个确定一个不定Q则是以上两U方法的l合Q即Q?br /><html:link page="/test.do?action=modify" paramId="userid" paramName="uid">modify</html:link>
4.对于多个参数的问题，可以使用一个HashMap集合对象来存放所有的参数名及对应的参数值的方式QparamName属性值指定ؓ该HashMap集合对象卛_?br />举例Q?br /><%
//代码理想的位|应该是在action?br />//可以在jsp面试
java.util.HashMap pms = new java.util.HashMap();
pms.put("code", "001002");
pms.put("name", "tester");
pms.put("alias", new String[]{"matin","jack"});
request.setAttribute("params", pms);
%>
<html:link action="/test.do" name="params" >test</html:link>
~译后的l果Q?lt;a href="/test.do?code=001002&name=tester&alias=matin&alias=jack">test</a>
q种方式虽然可以解决传多参数的问题，但是实现h也比较麻烦，特别是对记录集中的数据逐条列出的时?/p>
5.针对有的|友?lt;html:link>标签中嵌入用jsp脚本(scriptlet)的问题，
例如:
<html:link page="/test.do?code=<%=varible%>">add</html:link>Q这U写法是错误的，是无法编译的?br />有的|友认ؓ在struts标签内是不允怋用jsp脚本的，q种说法也不准确。如果前面的写法Ҏ:
<html:link page="<%="/test.do?code="+varible%>">add</html:link>Q就可以被执行，但是要注意URL相对路径的问题?/p>
虽然在struts标签中嵌入jsp脚本不是真正意义上的struts应用Q但是有时在委曲求全的情况下也只能如此了Q除非用自定义标签。比如在form表单中可能需要根据具体数据让某个字段是只ȝQ就可以用嵌入jsp脚本来实玎ͼ
<%
boolean rdonly=false;
if(2==2) rdonly=true;
%>
<html:text property="userid" readonly="<%=rdonly%>" />
6.另外一U比较变态的ҎQ既不是真正意义上的strutsQ也不符合xml规范。那是?lt;a>标签中用<bean:write>标签输出参数倹{?br />如：<a href="test.do?uid=<bean:write name="user" property="userid"/>&name=<bean:write name="user" property="username"/>">test</a>
]]>