SSM框架如何匯入儘可能少的包
首先是配置web.xml
將請求交給spring的DispatcherServlet處理
程式碼如下
<?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" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0"> <display-name>springmvctest</display-name> <!-- 統一編碼 --> <filter> <filter-name>charsetEncoding</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> <init-param> <param-name>forceEncoding</param-name> <param-value>true</param-value> </init-param> </filter> <filter-mapping> <filter-name>charsetEncoding</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- 前端控制器 --> <servlet> <servlet-name>springmvc</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> <!-- 載入/WEB-INF/[servlet-name]-servlet.xml --> <load-on-startup>1</load-on-startup> </servlet> <servlet-mapping> <servlet-name>springmvc</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> </web-app>
其次配置springmvc-servlet.xml
<?xml version="1.0" encoding="UTF-8"?> <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:context="http://www.springframework.org/schema/context" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:task="http://www.springframework.org/schema/task" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.2.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd http://www.springframework.org/schema/task http://www.springframework.org/schema/task/spring-task-4.2.xsd"> <!-- 掃描路徑 --> <context:component-scan base-package="com.test.controller" > <context:include-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!-- 配置根檢視 --> <mvc:view-controller path="/" view-name="index"/> <!-- 啟用基於註解的配置 @RequestMapping, @ExceptionHandler,資料繫結 ,@NumberFormat , @DateTimeFormat ,@Controller ,@Valid ,@RequestBody ,@ResponseBody等 --> <mvc:annotation-driven /> <!-- 靜態資源配置 --> <mvc:resources location="/assets/" mapping="/assets/**"></mvc:resources> <!-- 檢視層配置 --> <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <property name="prefix" value="/WEB-INF/pages/"/> <property name="suffix" value=".jsp"/> </bean> </beans>
根據DispatcherServlet的完整路徑來看,我們需要加入
spring-web-4.x.x.RELEASE.jar
接著啟動服務檢視報錯並加入相關的jar
錯誤如下:
java.lang.NoClassDefFoundError: org/springframework/beans/factory/BeanNameAware
根據錯誤加入
spring-beans-4.x.x.RELEASE.jar
接著報錯
java.lang.NoClassDefFoundError: org/springframework/context/EnvironmentAware
繼續加入
spring-context-4.x.x.RELEASE.jar
接著報錯
java.lang.NoClassDefFoundError: org/springframework/core/env/Environment
繼續加人
spring-core-4.x.x.RELEASE.jar
接著報錯
org/apache/commons/logging/LogFactory
繼續加入
commons-logging-1.1.3.jar
接著報錯
java.lang.ClassNotFoundException: org.springframework.web.servlet.DispatcherServlet
嗯?這個錯是說找不到DispatcherServlet嗎,可是在剛開始都已經將
spring-web-4.x.x.RELEASE.jar 加入了
原來DispatcherServlet雖然字首是org.springframework.web.servlet可是它並不在spring-web-4.x.x.RELEASE.jar中
它在
spring-webmvc-4.x.x.RELEASE.jar
中,好,將其加入
接著報錯
java.lang.NoClassDefFoundError: org/springframework/aop/TargetSource
引入
spring-aop-4.x.x.RELEASE.jar
接著報錯
java.lang.NoClassDefFoundError: org/springframework/expression/ParserContext
引入
spring-expression-4.x.x.RELEASE.jar
到這裡已經不報錯了
然後開發Controller
寫一個helloworld
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
@Controller
@RequestMapping(value="/hello")
public class HelloController {
@RequestMapping(value="/world",method=RequestMethod.GET)
public String hello(Model model){
model.addAttribute("msg", "你好spring mvc");
return "index";
}
}
最後開發展示層
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>hello</title>
</head>
<body>
<h1>Hello Spring</h1>
${msg }
</body>
</html>
好了開啟瀏覽器訪問
http://localhost:8080/springmvctest/hello/world.html
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作者:GW_Cheng
原文:https://blog.csdn.net/frankcheng5143/article/details/50512340