spring-mvc - 如何将属性文件中的 spring 3.1 classNameString 转换为类？

Question

我可以轻松地在 XML 中进行配置，但在 @Configuration 中却不行。

特性

spring.view.class=org.springframework.web.servlet.view.JstlView
spring.view.prefix=/WEB-INF/jsp/
spring.view.suffix=.jsp

代码

@Bean
public UrlBasedViewResolver viewResolver() throws ClassNotFoundException {
  //ViewResolver Setting
  Class viewResolverClass = env.getPropertyAsClass("spring.view.class", Class.class);
  String viewResolverPrefix = env.getProperty("spring.view.prefix");
  String viewResolverSuffix = env.getProperty("spring.view.suffix");
  UrlBasedViewResolver viewResolver = new UrlBasedViewResolver();
  viewResolver.setViewClass(viewResolverClass);
  viewResolver.setPrefix(viewResolverPrefix);
  viewResolver.setSuffix(viewResolverSuffix);
  return viewResolver;
}

错误

throws java.lang.ClassNotFoundException] threw exception; nested exception is java.lang.IllegalArgumentException: Cannot convert value [org.springframework.web.servlet.view.JstlView] from source type [String] to target type [Class]

提前致谢。

Answer 1

错误信息太明显了，说明一切：

无法将值...从源类型 [String] 转换为目标类型 [Class]

所以，你应该手动转换String成Class这样：

viewResolver.setViewClass(Class.forName(viewResolverClass));