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831 lines
20 KiB
HTML
831 lines
20 KiB
HTML
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<meta property="og:description" content="我们在开发java web 的程序时候，经常会需要给用户提示信息，或者页面。最常见的，比如用户输入了一个不存在的网址，默认情况下Tomcat会给用户返回一个默认的页面。如下所示： 这个页面千篇一律。我们完全可以给用户展示一个自定义的页面。 其实java web程序中web.xml 本身就支持自定义错误页面，我们只需要在web.xml添加如下信息： &lt;error-page&gt; &lt;">
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<title>java web.xml定义配置错误页面及使用 | 大染志</title>
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<h1 class="post-title" itemprop="name headline">java web.xml定义配置错误页面及使用</h1>
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2012-08-16
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2014-07-22
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，
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<p>我们在开发java web 的程序时候，经常会需要给用户提示信息，或者页面。最常见的，比如用户输入了一个不存在的网址，默认情况下Tomcat会给用户返回一个默认的页面。如下所示：</p>
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<p><a href="/images/2012/08/22.jpg"><img class="aligncenter size-full wp-image-2165" title="22" src="/images/2012/08/22.jpg" alt="" width="529" height="182"></a></p>
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<p>这个页面千篇一律。我们完全可以给用户展示一个自定义的页面。</p>
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<p>其实java web程序中web.xml 本身就支持自定义错误页面，我们只需要在web.xml添加如下信息：</p>
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<pre class="brush: xml; title: ; notranslate" title=""><error-page>
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<error-code>404</error-code>
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<location>/errorpage/404.html</location>
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</error-page>
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<error-page>
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<error-code>401</error-code>
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<location>/errorpage/401.html</location>
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</error-page>
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<error-page>
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<error-code>500</error-code>
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<location>/errorpage/500.html</location>
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</error-page>
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</pre>
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<p>当然“error-code”，可以自己选择在程序中出现得最多的错误码。我个人认为通常我们拦截：</p>
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<p>401：未授权</p>
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<p>404：没有找到页面</p>
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<p>500：服务器内部错误</p>
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<p>这三个即可。在“location”中配置你自己的html,当然页面样式，内容这些这些都可以自己定义。这个就看你自己啦。</p>
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<p>如果我们不做其他操作，当系统出现这些错误情况时，服务器就会自动调用我们配置的网页。当然我们可以自行在恰当的时候使用它。</p>
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<p>在servlet或者其他可能访问到HttpServletResponse对象的地方，使用：</p>
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<pre class="brush: java; title: ; notranslate" title="">response.sendError(404); //404为你需要的错误代码
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//也可以向前台网页传输错误语句，不过前台网页需要相应支持。这里没有实现
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response.sendError(404,"这里写想要输出到前台的提示信息");
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</pre>
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<p>在java中还可以使用：</p>
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<pre class="brush: java; title: ; notranslate" title="">response.setStatus(404); //设置状态码
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</pre>
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<p>设置状态码来实现，不过这并不能调用配置的自定义页面。只是在前台显示错误，并无输出。</p>
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<a href="/tags/java/" rel="tag"># java</a>
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<a href="/tags/web/" rel="tag"># web</a>
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<a href="/tags/web-xml/" rel="tag"># web.xml</a>
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<i class="fa fa-chevron-left"></i> java 服务器端实现HTTP无enctype=”multipart/form-data”文件上传
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