SpringMVC-组件分析之视图解析器（prefix，suffix）
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2022-04-17 21:22:09
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SpringMVC的默认组件都是在DispatcherServlet.properties配置文件中配置的；
spring-webmvc->org/springframewrok/web/servlet/DispatcherServlet.properties,该文件中配置了默认的视图解析器
打开org.springframework.web.servlet.view.UrlBasedViewResolver翻看该解析器源码，可以看到该解析器的默认设置
public static final String REDIRECT_URL_PREFIX = "redirect:";//重定向前缀
public static final String FORWARD_URL_PREFIX = "forward:"; //转发前缀
private String prefix = ""; //视图名称前缀
private String suffix = ""; //视图名称后缀
我们来覆写视图解析器（spring-webmvc核心jar包一定得导入）
1.在webapp下面新建/jsp/success.jsp文件
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Title</title>
</head>
<body>
<h1>success</h1>
</body>
</html>
2.在web.xml中配置web核心控制器及监听器
<?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">
<!-- 配置springMVC的核心配置控制器DispatcherServlet-->
<servlet>
<servlet-name>DispatcherServlet</servlet-name>
<servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
<init-param>
<param-name>contextConfigLocation</param-name>
<param-value>classpath:spring-mvc.xml</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>DispatcherServlet</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<!-- 配置监听器-->
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
</web-app>
3.编写UserController类
@Controller
public class UserController {
@RequestMapping("/report")
public String save(){
return "success";
}
}
4.编写spring-mvc.xml配置文件（注册扫描以及视图解析器）
<?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: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/context http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd">
<!-- 扫描controller包下得类-->
<context:component-scan base-package="com.hao.controller"/>
<!-- 配置内部资源视图解析器-->
<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/jsp/"></property>
<property name="suffix" value=".jsp"></property>
</bean>
</beans>
这一步配置视图解析器主要是为了步骤3中的return“success”；如果你不配置那步骤三就要写成return “/jsp/success.jsp";当你配置了之后，前端控制器会帮你拼装起来；
默认是转发，如果要写成重定向需要写为return ”redirect：/success“；