servlet中service、doGet、doPost等方法关系
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<p>在servlet中默认情况下，无论你是get还是post 提交过来都会经过service（）方法来处理，然后转向到doGet</p><p>或是doPost方法，可以看HttpServlet 类的service方法：</p><div class="dp-highlighter"><div class="bar"><div class="tools">Java代码</div></div><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets_01.png"></a></div></div><div class="dp-highlighter bg_java"><div class="bar"><div class="tools"><b>[java]</b> <a href="#" class="ViewSource" title="view plain" onclick="dp.sh.Toolbar.Command('ViewSource',this);return false;">view plain</a><span data-mod="popu_168"> <a href="#" class="CopyToClipboard" title="copy" onclick="dp.sh.Toolbar.Command('CopyToClipboard',this);return false;">copy</a><div style="position: absolute; left: 592px; top: 593px; width: 29px; height: 14px; z-index: 99;"><embed id="ZeroClipboardMovie_1" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="29" height="14" name="ZeroClipboardMovie_1" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=1&width=29&height=14" wmode="transparent"></div></span><span data-mod="popu_169"> <a href="#" class="PrintSource" title="print" onclick="dp.sh.Toolbar.Command('PrintSource',this);return false;">print</a></span><a href="#" class="About" title="?" onclick="dp.sh.Toolbar.Command('About',this);return false;">?</a><span class="tracking-ad" data-mod="popu_167"><a href="https://code.csdn.net/snippets/167649" target="_blank" title="在CODE上查看代码片" style="text-indent:0;"><img src="https://code.csdn.net/assets/CODE_ico.png" width="12" height="12" alt="在CODE上查看代码片" style="position:relative;top:1px;left:2px;"></a></span><span class="tracking-ad" data-mod="popu_170"><a href="https://code.csdn.net/snippets/167649/fork" target="_blank" title="派生到我的代码片" style="text-indent:0;"><img src="https://code.csdn.net/assets/ico_fork.svg" width="12" height="12" alt="派生到我的代码片" style="position:relative;top:2px;left:2px;"></a></span></div></div><ol start="1" class="dp-j"><li class="alt"><span><span class="keyword">protected</span><span> </span><span class="keyword">void</span><span> service(HttpServletRequest req, HttpServletResponse resp) </span></span></li><li class=""><span> <span class="keyword">throws</span><span> ServletException, IOException </span></span></li><li class="alt"><span> { </span></li><li class=""><span> String method = req.getMethod(); </span></li><li class="alt"><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"GET"</span><span>)) </span></span></li><li class=""><span> { </span></li><li class="alt"><span> <span class="keyword">long</span><span> lastModified = getLastModified(req); </span></span></li><li class=""><span> <span class="keyword">if</span><span>(lastModified == -1L) </span></span></li><li class="alt"><span> { </span></li><li class=""><span> doGet(req, resp); </span></li><li class="alt"><span> } <span class="keyword">else</span><span> </span></span></li><li class=""><span> { </span></li><li class="alt"><span> <span class="keyword">long</span><span> ifModifiedSince = req.getDateHeader(</span><span class="string">"If-Modified-Since"</span><span>); </span></span></li><li class=""><span> <span class="keyword">if</span><span>(ifModifiedSince < (lastModified / 1000L) * 1000L) </span></span></li><li class="alt"><span> { </span></li><li class=""><span> maybeSetLastModified(resp, lastModified); </span></li><li class="alt"><span> doGet(req, resp); </span></li><li class=""><span> } <span class="keyword">else</span><span> </span></span></li><li class="alt"><span> { </span></li><li class=""><span> resp.setStatus(<span class="number">304</span><span>); </span></span></li><li class="alt"><span> } </span></li><li class=""><span> } </span></li><li class="alt"><span> } <span class="keyword">else</span><span> </span></span></li><li class=""><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"HEAD"</span><span>)) </span></span></li><li class="alt"><span> { </span></li><li class=""><span> <span class="keyword">long</span><span> lastModified = getLastModified(req); </span></span></li><li class="alt"><span> maybeSetLastModified(resp, lastModified); </span></li><li class=""><span> doHead(req, resp); </span></li><li class="alt"><span> } <span class="keyword">else</span><span> </span></span></li><li class=""><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"POST"</span><span>)) </span></span></li><li class="alt"><span> doPost(req, resp); </span></li><li class=""><span> <span class="keyword">else</span><span> </span></span></li><li class="alt"><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"PUT"</span><span>)) </span></span></li><li class=""><span> doPut(req, resp); </span></li><li class="alt"><span> <span class="keyword">else</span><span> </span></span></li><li class=""><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"DELETE"</span><span>)) </span></span></li><li class="alt"><span> doDelete(req, resp); </span></li><li class=""><span> <span class="keyword">else</span><span> </span></span></li><li class="alt"><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"OPTIONS"</span><span>)) </span></span></li><li class=""><span> doOptions(req, resp); </span></li><li class="alt"><span> <span class="keyword">else</span><span> </span></span></li><li class=""><span> <span class="keyword">if</span><span>(method.equals(</span><span class="string">"TRACE"</span><span>)) </span></span></li><li class="alt"><span> { </span></li><li class=""><span> doTrace(req, resp); </span></li><li class="alt"><span> } <span class="keyword">else</span><span> </span></span></li><li class=""><span> { </span></li><li class="alt"><span> String errMsg = lStrings.getString(<span class="string">"http.method_not_implemented"</span><span>); </span></span></li><li class=""><span> Object errArgs[] = <span class="keyword">new</span><span> Object[</span><span class="number">1</span><span>]; </span></span></li><li class="alt"><span> errArgs[<span class="number">0</span><span>] = method; </span></span></li><li class=""><span> errMsg = MessageFormat.format(errMsg, errArgs); </span></li><li class="alt"><span> resp.sendError(<span class="number">501</span><span>, errMsg); </span></span></li><li class=""><span> } </span></li><li class="alt"><span> } </span></li></ol><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div><pre code_snippet_id="167649" snippet_file_name="blog_20140123_1_9003153" style="display: none;" class="java" title="servlet中service doGet doPost 的关系" pre_index="0" source_url="http://jzinfo.iteye.com/blog/457574" codeable_type="Blog" codeable_id="457574" name="code"> protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String method = req.getMethod(); if(method.equals("GET")) { long lastModified = getLastModified(req); if(lastModified == -1L) { doGet(req, resp); } else { long ifModifiedSince = req.getDateHeader("If-Modified-Since"); if(ifModifiedSince < (lastModified / 1000L) * 1000L) { maybeSetLastModified(resp, lastModified); doGet(req, resp); } else { resp.setStatus(304); } } } else if(method.equals("HEAD")) { long lastModified = getLastModified(req); maybeSetLastModified(resp, lastModified); doHead(req, resp); } else if(method.equals("POST")) doPost(req, resp); else if(method.equals("PUT")) doPut(req, resp); else if(method.equals("DELETE")) doDelete(req, resp); else if(method.equals("OPTIONS")) doOptions(req, resp); else if(method.equals("TRACE")) { doTrace(req, resp); } else { String errMsg = lStrings.getString("http.method_not_implemented"); Object errArgs[] = new Object[1]; errArgs[0] = method; errMsg = MessageFormat.format(errMsg, errArgs); resp.sendError(501, errMsg); } }</pre><p> </p><p> 从上面可以看出 这里的service是用来转向的，但是如果你在自己的servlet类中覆盖了service方法，比如说你的service是这样的：</p><p> </p><div class="dp-highlighter"><div class="bar"><div class="tools">Java代码 <div class="dp-highlighter bg_java"><div class="bar"><div class="tools"><b>[java]</b> <a href="#" class="ViewSource" title="view plain" onclick="dp.sh.Toolbar.Command('ViewSource',this);return false;">view plain</a><span data-mod="popu_168"> <a href="#" class="CopyToClipboard" title="copy" onclick="dp.sh.Toolbar.Command('CopyToClipboard',this);return false;">copy</a><div style="position: absolute; left: 650px; top: 1781px; width: 29px; height: 14px; z-index: 99;"><embed id="ZeroClipboardMovie_2" src="http://static.blog.csdn.net/scripts/ZeroClipboard/ZeroClipboard.swf" loop="false" menu="false" quality="best" bgcolor="#ffffff" width="29" height="14" name="ZeroClipboardMovie_2" align="middle" allowscriptaccess="always" allowfullscreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="id=2&width=29&height=14" wmode="transparent"></div></span><span data-mod="popu_169"> <a href="#" class="PrintSource" title="print" onclick="dp.sh.Toolbar.Command('PrintSource',this);return false;">print</a></span><a href="#" class="About" title="?" onclick="dp.sh.Toolbar.Command('About',this);return false;">?</a><span class="tracking-ad" data-mod="popu_167"><a href="https://code.csdn.net/snippets/167649" target="_blank" title="在CODE上查看代码片" style="text-indent:0;"><img src="https://code.csdn.net/assets/CODE_ico.png" width="12" height="12" alt="在CODE上查看代码片" style="position:relative;top:1px;left:2px;"></a></span><span class="tracking-ad" data-mod="popu_170"><a href="https://code.csdn.net/snippets/167649/fork" target="_blank" title="派生到我的代码片" style="text-indent:0;"><img src="https://code.csdn.net/assets/ico_fork.svg" width="12" height="12" alt="派生到我的代码片" style="position:relative;top:2px;left:2px;"></a></span></div></div><ol start="1" class="dp-j"><li class="alt"><span><span class="keyword">public</span><span> </span><span class="keyword">void</span><span> service(ServletRequest req, ServletResponse res) </span></span></li><li class=""><span> <span class="keyword">throws</span><span> ServletException, IOException { </span></span></li><li class="alt"><span> res.getOutputStream().print( </span></li><li class=""><span> <span class="string">"image is <img src='images/downcoin.gif'></img><br>"</span><span>); </span></span></li><li class="alt"><span> } </span></li></ol><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div><pre code_snippet_id="167649" snippet_file_name="blog_20140123_2_1543646" style="display: none;" class="java" title="servlet中service doGet doPost 的关系" pre_index="1" source_url="http://jzinfo.iteye.com/blog/457574" codeable_type="Blog" codeable_id="457574" name="code">public void service(ServletRequest req, ServletResponse res) throws ServletException, IOException { res.getOutputStream().print( "image is <img src='images/downcoin.gif'></img><br>"); }</pre></div></div><div class="save_code tracking-ad" data-mod="popu_249" style="display: none;"><a href="javascript:;" target="_blank"><img src="http://static.blog.csdn.net/images/save_snippets.png"></a></div></div><p> </p><p><span style="color:#000000">那么这时service就不是用来转向的，而是用来处理业务的，现在不论你的客户端是用pos还是get来请求此servlet</span></p><p>都会执行service方法也只能执行servlet方法，不会去执行doPost或是doGet方法。</p><p> </p> 0 0
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