关于动态参数使用@PathVariable的解析

<a href="<c:url value=" rel="external nofollow" /actions/article/readArticle/${article.id}"/> "
                                                 target="_blank">${article.title}</a>

public static final String URL_ARTICLE_READ = "article/readArticle/{articleId}";
    /**
     * 去文章详情页面
     * 根据URL路径中指定的文章ID号，去获取制定文章的内容
     *
     * @param articleId 指定的文章的ID号
     * @return          获取此文章的数据，并去文章详情页面
     */
    @RequestMapping(value = {URL_ARTICLE_READ} )
    public ModelAndView readArticle(@PathVariable("articleId") Long articleId){
        LOGGER.info("enter article detail page, articleId = {}",articleId);
        final Article article = articleService.getArticleById(articleId);
    ...
    }

@RequestMapping("/get_param")
@Controller
public class GetParamController {
	@RequestMapping("/test6/{name}")  
	public String test6(@PathVariable String name) {
		System.out.println("GetParamController test6()...");
		System.out.println("name="+name);
		return "test";//跳转到test.jsp
		/* 
		 * ../test6/tom   结果:name=null 就要在参数里面加上@PathVariable  结果就变为:name=tom
		 * ../test6/tom?name=kk  结果:name=tom  拿到的是URI路径里面的值跟后面的没有任何关系
		 * */
	}
}

@RequestMapping("/get_param")
@Controller
public class GetParamController {
	@RequestMapping("/test7/{username}")  //username与下面的name不一致,报错,就需要加上@PathVariable("username")
	public String test7(@PathVariable("username") String name) {//name和username不一致时,用@PathVariable("username")
		System.out.println("GetParamController test7()...");
		System.out.println("name="+name);
		return "test";//跳转到test.jsp
	}
}