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开发框架

2016-12-05 14:59:39   27  举报

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JAVA

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作者其他创作

大纲/内容

web层框架

struts1

springMVC

优点

属于SpringFrameWork的后续产品，已经融合在spring web flow里面，不用整合

使用起来简单

缺点

功能不如struts2强大

应用

1.引入jar包

2.配置核心控制器（前端控制器）

class : DispatcherServlet

web中配置 <servlet>

配置servlet启动的优先级

<init-param>下<load-on-startup>1</load-on-startup>

当值为0或者大于0时，容器在应用启动时就加载这个servlet

当是一个负数时或者没有指定时，则指示容器在该servlet被选择时才加载

正数的值越小，启动该servlet的优先级越高

如果值重复也不会出现异常，服务器会自己决定初始化顺序

3.配置文件

位置/文件名

默认位置 /WEB-INF/

默认文件名 web.xml文件中的servlet-name 加上 '-servlet.xml'

改名改位置 <init-param>           <param-name>contextConfigLocation</param-name>           <param-value>/WEB-INF/spring-servlet.xml,/WEB-INF/spring-user.xml</param-value>       </init-param>

多个配置文件用逗号分隔

启动spring的注解

<context:annotation-config />

文件头部

<?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:mvc="http://www.springframework.org/schema/mvc"     xmlns:context="http://www.springframework.org/schema/context"     xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd         http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd             http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">

启动spring bean扫描

<context:component-scan base-package="com.txzb.cfx.controller" />     <context:component-scan base-package="com.json" />

开启springMVC的注解

<em style="font-size: 13px; font-style: normal; color: rgb(204, 0, 0); font-family: arial; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 20px; orphans: auto; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);">xmlns （xml <em style="font-size: 13px; font-style: normal; color: rgb(204, 0, 0); font-family: arial; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 20px; orphans: auto; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);"><span style="color: rgb(51, 51, 51); font-family: arial; font-size: 13px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 20px; orphans: auto; text-align: left; text-indent: 0px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none; background-color: rgb(255, 255, 255);">Namespaces xml命名空间)

1. 定义

位置  最外层的<span style="color: rgb(102, 102, 102); font-family: 宋体; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none; background-color: rgb(255, 255, 255);">beans开始标签中

<span style="color: rgb(102, 102, 102); font-family: 'Times New Roman'; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; display: inline !important; float: none; background-color: rgb(255, 255, 255);">xmlns:namespace-prefix="namespaceURI"

使用xmlns的必要性： <span style="word-wrap: break-word; color: rgb(102, 102, 102); font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: 宋体; background-color: rgb(255, 255, 255);">命名空间被定义之后，所有带有相同前缀的子元素都会与同一个命名空间相关联。避免<span style="word-wrap: break-word; color: rgb(102, 102, 102); font-family: 宋体, Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" lang="EN-US">XML<span style="word-wrap: break-word; color: rgb(102, 102, 102); font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: 宋体; background-color: rgb(255, 255, 255);">解析器对<span style="word-wrap: break-word; color: rgb(102, 102, 102); font-family: 宋体, Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" lang="EN-US">xml<span style="word-wrap: break-word; color: rgb(102, 102, 102); font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: 宋体; background-color: rgb(255, 255, 255);">解析时的发送名字冲突

2.使用

<span style="word-wrap: break-word; color: rgb(102, 102, 102); font-family: 宋体, Arial; font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; background-color: rgb(255, 255, 255);" lang="EN-US">namespace-prefix<span style="word-wrap: break-word; color: rgb(102, 102, 102); font-size: 16px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: 26px; orphans: auto; text-align: left; text-indent: 28px; text-transform: none; white-space: normal; widows: 1; word-spacing: 0px; -webkit-text-stroke-width: 0px; font-family: 宋体; background-color: rgb(255, 255, 255);">（前缀）：属性

方式一： <mvc:annotation-driven/>

方式二：AnnotationMethodHandlerAdapter

4.普通java类

1.类：普通java类即可，不用继承

2.方法: 返回值、方法名、参数列表都任意建议返回String，作为返回路径

@Controller 表示此类是控制层

@RequestMapping 配置类或方法的访问路径

value="" 访问路径

method=RequestMethod.GET/POST/PUT/DELETE

param="method=delete"   访问方法 ?method=delete

@RequestParam

@PathVariable