SpringMVC源码---RequestToViewNameTranslator

谁践踏了优雅 2022-05-15 05:20 211阅读 0赞

作用：RequestToViewNameTranslator可以在View返回为空时使用它根据request获取viewName。SpringMVC提供一个DefaultRequestToViewNameTranslator实现类，这个实现类比较简单，主要执行解析的方法如下：

public class DefaultRequestToViewNameTranslator implements RequestToViewNameTranslator {
        private static final String SLASH = "/";
        private String prefix = "";
        private String suffix = "";
        private String separator = "/";
        private boolean stripLeadingSlash = true;
        private boolean stripTrailingSlash = true;
        private boolean stripExtension = true;
        
        private UrlPathHelper urlPathHelper = new UrlPathHelper();
    
        //这里分别添加了前缀和后缀
        public String getViewName(HttpServletRequest request) {
            String lookupPath = this.urlPathHelper.getLookupPathForRequest(request);
            return this.prefix + this.transformPath(lookupPath) + this.suffix;
        }
        //这里处理分隔符“，",“/"
        @Nullable
        protected String transformPath(String lookupPath) {
            String path = lookupPath;
            if (this.stripLeadingSlash && lookupPath.startsWith("/")) {
                path = lookupPath.substring(1);
            }
    
            if (this.stripTrailingSlash && path.endsWith("/")) {
                path = path.substring(0, path.length() - 1);
            }
    
            if (this.stripExtension) {
                path = StringUtils.stripFilenameExtension(path);
            }
    
            if (!"/".equals(this.separator)) {
                path = StringUtils.replace(path, "/", this.separator);
            }
    
            return path;
        }
    }

另外还给UrlPathHelper属性设置了一些参数：

*  urlDecode:用于设置url是否需要编码，一般默认就可以了
 *  removeSemicolonContent：用于设置是否删除url中与分号相关的内容
 *  alwaysUseFullPath：用于设置是否总是使用完整路径

urlPathHelper：前三个参数都是设置在这个属性中，这个属性就是用来处理url的工具