java web各种路径获取

对于java web各种路径的获取一直有点混乱，找个时间用代码实际测试了一下，做一下记录~

代码：

private void printPath(HttpServletRequest request){        printStr("request.getScheme()", request.getScheme());        printStr("request.getServerName()", request.getServerName());        printStr("request.getServerPort()", request.getServerPort());        printStr("request.getContextPath()", request.getContextPath());        printStr("request.getServletPath()", request.getServletPath());        printStr("request.getRequestURI()", request.getRequestURI());        printStr("request.getPathInfo()", request.getPathInfo());        printStr("request.getLocalPort()", request.getLocalPort());        printStr("request.getLocalAddr()", request.getLocalAddr());        printStr("request.getLocalName()", request.getLocalName());        System.out.println("=========session========");         ServletContext servletContext = request.getSession().getServletContext();        printStr("servletContext.getRealPath('\\')", servletContext.getRealPath("/"));        printStr("servletContext.getContextPath()", servletContext.getContextPath());        printStr("servletContext.getServerInfo()", servletContext.getServerInfo());    }   private void printStr(String name, Object value){     System.out.println(name + ":" + value);  }

输出：

request.getScheme():http  request.getServerName():localhost  request.getServerPort():8080  request.getContextPath():/myweb  request.getServletPath():/test  request.getRequestURI():/myweb/test  request.getPathInfo():null  request.getLocalPort():8080  request.getLocalAddr():0:0:0:0:0:0:0:1  request.getLocalName():0:0:0:0:0:0:0:1  =========session========  servletContext.getRealPath('\'):D:\Develop\tomcat\apache-tomcat-7.0.57_jdk8\webapps\myweb\  servletContext.getContextPath():/myweb  servletContext.getServerInfo():Apache Tomcat/7.0.57

-------------------------------------------------万恶的分割线-------------------------------------------------

此处注意一下这个方法：获取绝对路径

servletContext.getRealPath("/")

在web后台，如果想创建一个file对象，需使用到绝对路径。使用时的传值与返回值还是以示例说明：

printStr("servletContext.getRealPath('\\')", servletContext.getRealPath("\\"));输出：D:\Develop\tomcat\apache-tomcat-7.0.57_jdk8\webapps\myweb\printStr("servletContext.getRealPath('\\')", servletContext.getRealPath("/"))输出：D:\Develop\tomcat\apache-tomcat-7.0.57_jdk8\webapps\myweb\printStr("servletContext.getRealPath('\\')", servletContext.getRealPath("key.txt"));输出：D:\Develop\tomcat\apache-tomcat-7.0.57_jdk8\webapps\myweb\key.txt//一下几种传值输出一样的printStr("servletContext.getRealPath('\\')", servletContext.getRealPath("//"));printStr("servletContext.getRealPath('\\')", servletContext.getRealPath(""));输出：D:\Develop\tomcat\apache-tomcat-7.0.57_jdk8\webapps\myweb

在来看一下getRealPath的源码：

 @Overridepublic String getRealPath(String path) {Resource resource = this.resourceLoader.getResource(getResourceLocation(path));try {return resource.getFile().getAbsolutePath();}catch (IOException ex) {logger.warn("Couldn't determine real path of resource " + resource, ex);return null;}}

getResourceLocation(path)的源码：

        /** * Build a full resource location for the given path, prepending the resource * base path of this {@code MockServletContext}. * @param path the path as specified * @return the full resource path */protected String getResourceLocation(String path) {if (!path.startsWith("/")) {path = "/" + path;}return this.resourceBasePath + path;}

到此就明白了，要是获取web根目录的绝对路径，传个空字符串（“”）就ok了，要是根目录下的其他路径，直接跟路径就好咯~

                                             
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