[刘阳Java]_BeanNameViewResolver视图解析器_第8讲

BeanNameViewResolver：这个视图解析器跟XmlViewResolver有点类似，也是通过把返回的逻辑视图名称去匹配定义好的视图bean对象。它要求视图bean对象都定义在Spring的application context中，而XmlViewResolver是在指定的配置文件中寻找视图bean对象

1. 在SpringMVC配置文件中添加BeanNameViewResolver

<bean class="org.springframework.web.servlet.view.BeanNameViewResolver">  
    <property name="order" value="10" />  
</bean>     
<!-- 配置视图解析器 -->
<!--该视图解析器的order值为Integer.MAX_VALUE -->  
<bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
    <property name="prefix" value="/WEB-INF/"></property>  
    <property name="suffix" value=".jsp"></property>  
</bean>

2. 创建一个HelloView类，实现View接口

import java.util.Date;  
import java.util.Map;  
  
import javax.servlet.http.HttpServletRequest;  
import javax.servlet.http.HttpServletResponse;  
  
import org.springframework.stereotype.Component;  
import org.springframework.web.servlet.View;  
  
@Component  
public class HelloView implements View{  
  
    public String getContentType() {  
        // TODO Auto-generated method stub  
        return "text/html";  
    }  
  
    public void render(Map<String, ?> model, HttpServletRequest request,  
            HttpServletResponse response) throws Exception {  
        // TODO Auto-generated method stub  
        response.getWriter().print("Welcome to View:"+new Date());   
    }  
  
}

3. 创建控制器

import org.springframework.stereotype.Controller;  
import org.springframework.web.bind.annotation.RequestMapping;  
  
@RequestMapping(value="/springmvc")  
@Controller  
public class MyView {  
    @RequestMapping(value="/testMyView")  
    public String testView(){  
        System.out.println("testView");  
        return "helloView";
    }  
}

这里return的是视图名的第一个字母小写，springmvc会根据这个helloView名，去getBean,得到这个视图对象