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记录关于spring MVC入门遇见的问题

2015-05-10 11:43 274 查看
本人初入JAVA WEB。虽然学习路途遥远，但我确要一步步行走。

 

   在学习spring MVC时第一个遇见的问题是SVN获取源代码时遇见的验证失败错误。原因是URL:https://src.springframework.org/svn/spring-framework/ 代码服务器改为了https://github.com/SpringSource/spring-framework/
.

  第二个遇见的问题是

严重: ContainerBase.addChild: start:   
org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/xxxx]错误。原因是需要导入commons-logging.jar包。关于它们的关系：spring主要是javabean管理的，aop用作权限，日志管理方面，当然也会用到日志记录，这就需要引入日志包commons-logging.jar.

第三个遇见的问题是

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'simpleUrlHandlerMapping' defined in ServletContext resource [/WEB-INF/spring-servlet.xml]: Initialization of bean failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException:
No bean named 'helloControl' is defined错误。原因竟然是spring-servlet.xml里面<prop>的内容与<bean>不配对。哈哈。

  经过这些问题后，终于进入了spring MVC的HelloWord!，哈哈

下面列出.java、.xml、.jsp的代码.

 

spring-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<!-- Bean头部 -->
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:mvc="http://www.springframework.org/schema/mvc"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:util="http://www.springframework.org/schema/util"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-3.0.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd"> 
<bean id="simpleUrlHandlerMapping"
class="org.springframework.web.servlet.handler.SimpleUrlHandlerMapping"
>
<property name="mappings">
<props>
<prop key="/hello.do">helloControl</prop>

</props>

</property>

</bean>

<bean id="helloControl" class="controller.HelloWord"></bean>
</beans>

 

web.xml

 

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5">
<display-name></display-name>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
<servlet>
<servlet-name>spring</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>spring</servlet-name>
<url-pattern>*.do</url-pattern>
</servlet-mapping>
<!-- 注意导入commons-logging.jar包 -->
</web-app>


HelloWord.java

package controller;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import org.springframework.web.servlet.ModelAndView;

import org.springframework.web.servlet.mvc.Controller;

public class HelloWord implements Controller {

public ModelAndView handleRequest(HttpServletRequest request,
HttpServletResponse response)

throws Exception {

ModelAndView mav = new ModelAndView("hello.jsp");

mav.addObject("message", "Good luky!");

return mav;

}

}


hello.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>

<%

String path = request.getContextPath();

String basePath =
request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<base href="<%=basePath%>">

<title>My JSP 'hello.jsp' starting page</title>

<meta http-equiv="pragma" content="no-cache">

<meta http-equiv="cache-control" content="no-cache">

<meta http-equiv="expires" content="0">

<meta
http-equiv="keywords"
content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="This is my page">

<!--

<link rel="stylesheet" type="text/css" href="styles.css">

-->

</head>

<body>

获取值：
${message}

</body>

</html>


index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">

<title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>

<body>
<form action="test/login.do" method="POST">
<input type="text" name="userName"/>
<input type="password" name="password"/>
<input type="submit" value="commit"/>
</form>
</body>
</html>


 

 
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