📄 csdn_文档中心_struts快速学习指南5(内部培训教材)-大部分素材来自于《programming jakarta struts》一书.htm
字号:
style="FONT-SIZE: 10pt; mso-ansi-language: DA"> </SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">方法，如果</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>noCache</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">设置为</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>true</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">。则添加合适的响应头到响应对象中，使得页面保留在浏览器的</SPAN><SPAN
lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">Cache</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">中。这些响应头包含</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Pragma</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">, </SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Cache-Control</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">, </SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">和</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Expires</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA"> </SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">。</SPAN><TT><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></TT></P>
<P class=doctext
style="MARGIN: auto 0cm auto 50.25pt; TEXT-INDENT: -32.25pt; mso-list: l0 level1 lfo1; tab-stops: list 50.25pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">6、<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>processPreprocess</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">( )</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">方法，这个方法在这儿设置一个钩子，方法的默认实现只是简单地返回</SPAN><TT><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><FONT
color=#354278>true</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">，这样给了自定义处理器的开发者提供了一个合适的地方让你添加自己的业务逻辑。因为这个方法在调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Action</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">之前被调用，如果你重载这个方法，只需要返回</SPAN><TT><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><FONT
color=#354278>false</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">，则</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Action</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">就不会被调用。例如，你可以重载这个方法用户检查客户</SPAN><SPAN
lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">session</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">，如果不通过就返回</SPAN><SPAN
lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">false</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=doctext
style="MARGIN: auto 0cm auto 50.25pt; TEXT-INDENT: -32.25pt; mso-list: l0 level1 lfo1; tab-stops: list 50.25pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">7、<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>processMapping( )</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法，根据客户请求信息中的</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 10pt">path</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">信息来决定是否返回</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionMapping</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象实例。如果不能够找到</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>path</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的映射，则客户将会得到一个</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>error</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">响应。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=doctext
style="MARGIN: auto 0cm auto 50.25pt; TEXT-INDENT: -32.25pt; mso-list: l0 level1 lfo1; tab-stops: list 50.25pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">8、<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">通过调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>processRoles( )</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">方法检查是否为</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Action</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">配置了安全角色。如果配置了角色要求，则请求对象的</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>isUserInRole( )</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">方法被调用，如果用户属于这些角色，则客户会得到显示一个</SPAN><SPAN
lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">error</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">响应。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=doctext
style="MARGIN: auto 0cm auto 50.25pt; TEXT-INDENT: -32.25pt; mso-list: l0 level1 lfo1; tab-stops: list 50.25pt"><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; mso-fareast-font-family: 'Times New Roman'"><SPAN
style="mso-list: Ignore">9、<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></SPAN></SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>processActionForm( )</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">方法检查是否存在为</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionMapping</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">配置的</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionForm</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA"> </SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">。如果存在，则在有效区域内查找是否存在该</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionForm</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">的实例，存在，则复用，不存在，则创建一个实例。然后将实例保存与再配置文件中配置好的有效区域</SPAN><SPAN
lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">(</SPAN><TT><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><FONT
color=#354278>request</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">,</SPAN><TT><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><FONT
color=#354278>session</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">,</SPAN><TT><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><FONT
color=#354278>application</FONT></SPAN></TT><SPAN lang=DA
style="FONT-SIZE: 10pt; mso-ansi-language: DA">)</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">内，并用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>Action</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">元素的</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>name</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">属性作为该实例的关键字。</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 10pt"><o:p></o:p></SPAN></P>
<P class=doctext
style="MARGIN: auto 0cm auto 50.25pt; TEXT-INDENT: -32.25pt; mso-list: l0 level1 lfo1; tab-stops: list 50.25pt"><TT><SPAN
lang=EN-US
style="FONT-SIZE: 10pt; mso-fareast-font-family: 'Courier New'"><SPAN
style="mso-list: Ignore"><FONT color=#354278>10、<SPAN
style="FONT: 7pt 'Times New Roman'">
</SPAN></FONT></SPAN></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>processPopulate( )</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法，如果存来</SPAN><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">存在为</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionMapping</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-ansi-language: DA">配置的</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionForm</FONT></SPAN></TT><TT><SPAN
style="FONT-SIZE: 10pt; COLOR: windowtext; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Courier New'; mso-hansi-font-family: 'Courier New'; mso-ansi-language: DA">，则</SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">封装请求对象中的数据到</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionForm</FONT></SPAN></TT><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">中，在进行封装之前，先调用</SPAN><TT><SPAN
lang=DA style="FONT-SIZE: 10pt; mso-ansi-language: DA"><FONT
color=#354278>ActionForm</FONT></SPAN></TT><SPAN
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -