现在我们还要给web.xml添加一个<taglib>条目。
WEB-INF/web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>
<web-app>
<servlet>
<servlet-name>springapp</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springapp</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
<taglib>
<taglib-uri>/spring</taglib-uri>
<taglib-location>/WEB-INF/spring.tld</taglib-location>
</taglib>
</web-app>我们还需要在jsp文件的page指令中申明这个taglib。我们用普通的方法通过<form>标签声明一个表单,以及一个<input>文本域和一个提交按钮。WEB-INF/jsp/priceincrease.jsp
<%@ include file="/WEB-INF/jsp/include.jsp" %>
<%@ taglib prefix="spring" uri="/spring" %>
<html>
<head><title><fmt:message key="title"/></title></head>
<body>
<h1><fmt:message key="priceincrease.heading"/></h1>
<form method="post">
<table width="95%" bgcolor="f8f8ff" border="0" cellspacing="0" cellpadding="5">
<tr>
<td alignment="right" width="20%">Increase (%):</td>
<spring:bind path="priceIncrease.percentage">
<td width="20%">
<input type="text" name="percentage" value="<c:out value="${status.value}"/>">
</td>
<td width="60%">
<font color="red"><c:out value="${status.errorMessage}"/></font>
</td>
</spring:bind>
</tr>
</table>
<br>
<spring:hasBindErrors name="priceIncrease">
<b>Please fix all errors!</b>
</spring:hasBindErrors>
<br><br>
<input type="submit" alignment="center" value="Execute">
</form>
<a href="<c:url value="hello.htm"/>">Home</a>
</body>
</html>
<spring:bind>标记是用于将一个<input>表单元素绑定到一个命令对象PriceIncrease.java上的。这个命令对象以后会被传送给效验器,同时如果它通过了检验,它会被继续传送给控制器。${status.errorMessage}和${status.value}是由框架声明的特殊变量,可以用来显示错误信息和当前域的值。
bus/PriceIncrease.java
package bus;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class PriceIncrease {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private int percentage;
public void setPercentage(int i) {
percentage = i;
logger.info("Percentage set to " + i);
}
public int getPercentage() {
return percentage;
}
}这是一个十分简单的JavaBean类,同时这里有一个属性以及他的获取器和设置器。在用户按下了提交按钮之后,Validator类将获取控制。在表单中输入的值会被框架设置在命令对象上。然后会调用方法validate,并传入命令对象和一个用来存放错误信息的对象。
bus/PriceIncreaseValidator.java
package bus;
import java.io.Serializable;
import org.springframework.validation.Validator;
import org.springframework.validation.Errors;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class PriceIncreaseValidator implements Validator {
private int DEFAULT_MIN_PERCENTAGE = 0;
private int DEFAULT_MAX_PERCENTAGE = 50;
private int minPercentage = DEFAULT_MIN_PERCENTAGE;
private int maxPercentage = DEFAULT_MAX_PERCENTAGE;
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
public boolean supports(Class clazz) {
return clazz.equals(PriceIncrease.class);
}
public void validate(Object obj, Errors errors) {
PriceIncrease pi = (PriceIncrease) obj;
if (pi == null) {
errors.rejectValue("percentage", "error.not-specified", null, "Value required.");
}
else {
logger.info("Validating with " + pi + ": " + pi.getPercentage());
if (pi.getPercentage() > maxPercentage) {
errors.rejectValue("percentage", "error.too-high",
new Object[] {new Integer(maxPercentage)}, "Value too high.");
}
if (pi.getPercentage() <= minPercentage) {
errors.rejectValue("percentage", "error.too-low",
new Object[] {new Integer(minPercentage)}, "Value too low.");
}
}
}
public void setMinPercentage(int i) {
minPercentage = i;
}
public int getMinPercentage() {
return minPercentage;
}
public void setMaxPercentage(int i) {
maxPercentage = i;
}
public int getMaxPercentage() {
return maxPercentage;
}
}
WEB-INF/web.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>
<web-app>
<servlet>
<servlet-name>springapp</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>springapp</servlet-name>
<url-pattern>*.htm</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>
index.jsp
</welcome-file>
</welcome-file-list>
<taglib>
<taglib-uri>/spring</taglib-uri>
<taglib-location>/WEB-INF/spring.tld</taglib-location>
</taglib>
</web-app>我们还需要在jsp文件的page指令中申明这个taglib。我们用普通的方法通过<form>标签声明一个表单,以及一个<input>文本域和一个提交按钮。WEB-INF/jsp/priceincrease.jsp
<%@ include file="/WEB-INF/jsp/include.jsp" %>
<%@ taglib prefix="spring" uri="/spring" %>
<html>
<head><title><fmt:message key="title"/></title></head>
<body>
<h1><fmt:message key="priceincrease.heading"/></h1>
<form method="post">
<table width="95%" bgcolor="f8f8ff" border="0" cellspacing="0" cellpadding="5">
<tr>
<td alignment="right" width="20%">Increase (%):</td>
<spring:bind path="priceIncrease.percentage">
<td width="20%">
<input type="text" name="percentage" value="<c:out value="${status.value}"/>">
</td>
<td width="60%">
<font color="red"><c:out value="${status.errorMessage}"/></font>
</td>
</spring:bind>
</tr>
</table>
<br>
<spring:hasBindErrors name="priceIncrease">
<b>Please fix all errors!</b>
</spring:hasBindErrors>
<br><br>
<input type="submit" alignment="center" value="Execute">
</form>
<a href="<c:url value="hello.htm"/>">Home</a>
</body>
</html>
<spring:bind>标记是用于将一个<input>表单元素绑定到一个命令对象PriceIncrease.java上的。这个命令对象以后会被传送给效验器,同时如果它通过了检验,它会被继续传送给控制器。${status.errorMessage}和${status.value}是由框架声明的特殊变量,可以用来显示错误信息和当前域的值。
bus/PriceIncrease.java
package bus;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class PriceIncrease {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private int percentage;
public void setPercentage(int i) {
percentage = i;
logger.info("Percentage set to " + i);
}
public int getPercentage() {
return percentage;
}
}这是一个十分简单的JavaBean类,同时这里有一个属性以及他的获取器和设置器。在用户按下了提交按钮之后,Validator类将获取控制。在表单中输入的值会被框架设置在命令对象上。然后会调用方法validate,并传入命令对象和一个用来存放错误信息的对象。
bus/PriceIncreaseValidator.java
package bus;
import java.io.Serializable;
import org.springframework.validation.Validator;
import org.springframework.validation.Errors;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class PriceIncreaseValidator implements Validator {
private int DEFAULT_MIN_PERCENTAGE = 0;
private int DEFAULT_MAX_PERCENTAGE = 50;
private int minPercentage = DEFAULT_MIN_PERCENTAGE;
private int maxPercentage = DEFAULT_MAX_PERCENTAGE;
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
public boolean supports(Class clazz) {
return clazz.equals(PriceIncrease.class);
}
public void validate(Object obj, Errors errors) {
PriceIncrease pi = (PriceIncrease) obj;
if (pi == null) {
errors.rejectValue("percentage", "error.not-specified", null, "Value required.");
}
else {
logger.info("Validating with " + pi + ": " + pi.getPercentage());
if (pi.getPercentage() > maxPercentage) {
errors.rejectValue("percentage", "error.too-high",
new Object[] {new Integer(maxPercentage)}, "Value too high.");
}
if (pi.getPercentage() <= minPercentage) {
errors.rejectValue("percentage", "error.too-low",
new Object[] {new Integer(minPercentage)}, "Value too low.");
}
}
}
public void setMinPercentage(int i) {
minPercentage = i;
}
public int getMinPercentage() {
return minPercentage;
}
public void setMaxPercentage(int i) {
maxPercentage = i;
}
public int getMaxPercentage() {
return maxPercentage;
}
}
解决方案 »
- Runtime.getRuntime().exec如何以管理员身份执行呢
- 直接用servlet,jsp如何做文件上传(不用其他框架技术)
- 请教大家问题啊,JDBC查询速度慢
- 异常继承问题
- 关于struts
- 各位帮我看看连数据库的问题
- 在Struts中联接SQL Server数据库,期间遇到一些问题,与大家共享
- 将本地excel文件上传到ftp服务器上失败
- 已经写好的ant.bat脚本要对应在linux下应该的ant.sh文件,应该如何写?谢谢:)
- jb9.0整合WebLogicServer时候报错。。。在线等,解决后立马结贴!
- [转载&改编]一步一步开发Spring Framework MVC应用程序-4(Intellij IDEA版)
- 熟悉 tapestry 请进
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN"
"http://www.springframework.org/dtd/spring-beans.dtd">
<!--
- Application context definition for "springapp" DispatcherServlet.
-->
<beans>
<!-- Controller for the initial "Hello" page -->
<bean id="springappController" class="web.SpringappController">
<property name="productManager">
<ref bean="prodMan"/>
</property>
</bean>
<!-- Validator and Form Controller for the "Price Increase" page -->
<bean id="priceIncreaseValidator" class="bus.PriceIncreaseValidator"/>
<bean id="priceIncreaseForm" class="web.PriceIncreaseFormController">
<property name="sessionForm"><value>true</value></property>
<property name="commandName"><value>priceIncrease</value></property>
<property name="commandClass"><value>bus.PriceIncrease</value></property>
<property name="validator"><ref bean="priceIncreaseValidator"/></property>
<property name="formView"><value>priceincrease</value></property>
<property name="successView"><value>hello.htm</value></property>
<property name="productManager">
<ref bean="prodMan"/>
</property>
</bean>
<bean id="prodMan" class="bus.ProductManager">
<property name="products">
<list>
<ref bean="product1"/>
<ref bean="product2"/>
<ref bean="product3"/>
</list>
</property>
</bean>
<bean id="product1" class="bus.Product">
<property name="description"><value>Lamp</value></property>
<property name="price"><value>5.75</value></property>
</bean>
<bean id="product2" class="bus.Product">
<property name="description"><value>Table</value></property>
<property name="price"><value>75.25</value></property>
</bean>
<bean id="product3" class="bus.Product">
<property name="description"><value>Chair</value></property>
<property name="price"><value>22.79</value></property>
</bean>
<bean id="messageSource" class="org.springframework.context.support.ResourceBundleMessageSource">
<property name="basename"><value>messages</value></property>
</bean>
<bean id="urlMapping" class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping">
<property name="mappings">
<props>
<prop key="/hello.htm">springappController</prop>
<prop key="/priceincrease.htm">priceIncreaseForm</prop>
</props>
</property>
</bean>
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="viewClass">
<value>org.springframework.web.servlet.view.JstlView</value>
</property>
<property name="prefix"><value>/WEB-INF/jsp/</value></property>
<property name="suffix"><value>.jsp</value></property>
</bean>
</beans>下面,让我们看一下这个表单的控制器。onSubmit方法获取了控制并且在它调用ProductManager对象的increasePrice方法之前进行了一些日志记录。然后它使用successView的url创建了RedirectView的一个新的实例,并传递这个实例给ModelAndView,最后返回这个ModelAndView的实例。
web/PriceIncreaseFormController.java
package web;
import org.springframework.web.servlet.mvc.SimpleFormController;
import org.springframework.web.servlet.ModelAndView;
import org.springframework.web.servlet.view.RedirectView;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Map;
import java.util.HashMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import bus.Product;
import bus.ProductManager;
import bus.PriceIncrease;
public class PriceIncreaseFormController extends SimpleFormController {
/** Logger for this class and subclasses */
protected final Log logger = LogFactory.getLog(getClass());
private ProductManager prodMan;
public ModelAndView onSubmit(Object command)
throws ServletException {
int increase = ((PriceIncrease) command).getPercentage();
logger.info("Increasing prices by " + increase + "%.");
prodMan.increasePrice(increase);
String now = (new java.util.Date()).toString();
logger.info("returning from PriceIncreaseForm view to " + getSuccessView() +
" with " + now);
Map myModel = new HashMap();
myModel.put("now", now);
myModel.put("products", getProductManager().getProducts());
return new ModelAndView(new RedirectView(getSuccessView()));
}
protected Object formBackingObject(HttpServletRequest request) throws ServletException {
PriceIncrease priceIncrease = new PriceIncrease();
priceIncrease.setPercentage(20);
return priceIncrease;
}
public void setProductManager(ProductManager pm) {
prodMan = pm;
}
public ProductManager getProductManager() {
return prodMan;
}
}我们还要在message.properties资源文件里面添加一些消息。WEB-INF/classes/messages.properties
title=SpringApp
heading=Hello :: SpringApp
greeting=Greetings, it is now
priceincrease.heading=Price Increase :: SpringApp
error.not-specified=Percentage not specified!!!
error.too-low=You have to specify a percentage higher than {0}!
error.too-high=Don't be greedy - you can't raise prices by more than {0}%!
required=Entry required.
typeMismatch=Invalid data.
typeMismatch.percentage=That is not a number!!!最后,我们要从hello.jsp中提供一个指向priceincrease页面的链接。
WEB-INF/jsp/hello.jsp
<%@ include file="/WEB-INF/jsp/include.jsp" %>
<html>
<head><title><fmt:message key="title"/></title></head>
<body>
<h1><fmt:message key="heading"/></h1>
<p><fmt:message key="greeting"/> <c:out value="${model.now}"/>
</p>
<h3>Products</h3>
<c:forEach items="${model.products}" var="prod">
<c:out value="${prod.description}"/> <i>$<c:out value="${prod.price}"/></i><br><br>
</c:forEach>
<br>
<a href="<c:url value="priceincrease.htm"/>">Increase Prices</a>
<br>
</body>
</html>编译并运行,在重新载入应用之后,我们就可以再测试它了。下面是表单出错时所显示的样子:
注意:priceincrease.htm在提交的时候是通过spring在web.xml中定义的映射规则来进行的,不是通过form的action动作来提交请求。