在没有index.php的情况下,codeigniter重定向不起作用？

我是codeigniter的新手,同时重定向页面index.php默认没有加载,所以我在htaccess文件中尝试了下面的代码.我已经安装了php 5.3.10,apache服务器和postgres数据库.所以如果除了更改.htaccess和httpd.conf之外还要进行任何新的配置,请告诉我.我已经看到以前在同一问题上提出的问题,我从这些问题中提到了一切,但我仍然无法解决这个问题.请让我知道还有什么要做的事情.

.htaccess文件

<IfModule mod_rewrite.c> RewriteEngine On #Checks to see if the user is attempting to access a valid file,#such as an image or css document,if this isn't true it sends the #request to index.php RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d #This last condition enables access to the images and css folders,and the robots.txt file RewriteCond $1 !^(index.php|public|images|robots.txt|css) RewriteRule ^(.*)$index.php/$1 [L] </IfModule>
    RewriteEngine on RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteCond $1 !^/(index.php|assets/|humans.txt) RewriteRule ^(.*)$index.php/$1 [L]
    RewriteEngine on
    RewriteCond %{REQUEST_FILENAME} !-f
    RewriteCond %{REQUEST_FILENAME} !-d
    RewriteRule .* index.php/$0 [PT,L]

httpd.conf文件
????ServerName localhost

<Directory />
   Options FollowSymLinks
   AllowOverride All
   Order deny,allow
   Deny from all
</Directory>