📄 struts 2_0的action讲解 - max on java - blogjava.htm
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style="COLOR: #000000; BACKGROUND-COLOR: #ffff00"><%</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">@ taglib prefix</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">s</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"> uri</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">=</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">/struts-tags</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5">"</SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #f5f5f5"></SPAN><SPAN
style="COLOR: #000000; BACKGROUND-COLOR: #ffff00">%></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">html</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">head</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">title</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000">Login</SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">title</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">head</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">body</SPAN><SPAN style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000"><BR></SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">s:form </SPAN><SPAN
style="COLOR: #ff0000">action</SPAN><SPAN
style="COLOR: #0000ff">="Login"</SPAN><SPAN style="COLOR: #ff0000">
method</SPAN><SPAN style="COLOR: #0000ff">="POST"</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">s:textfield </SPAN><SPAN
style="COLOR: #ff0000">name</SPAN><SPAN
style="COLOR: #0000ff">="name"</SPAN><SPAN style="COLOR: #ff0000">
label</SPAN><SPAN style="COLOR: #0000ff">="User name"</SPAN><SPAN
style="COLOR: #ff0000"></SPAN><SPAN style="COLOR: #0000ff">/></SPAN><SPAN
style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">s:password
</SPAN><SPAN style="COLOR: #ff0000">name</SPAN><SPAN
style="COLOR: #0000ff">="password"</SPAN><SPAN style="COLOR: #ff0000">
label</SPAN><SPAN style="COLOR: #0000ff">="Password"</SPAN><SPAN
style="COLOR: #ff0000"></SPAN><SPAN style="COLOR: #0000ff">/></SPAN><SPAN
style="COLOR: #000000"><BR> </SPAN><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">s:submit
</SPAN><SPAN style="COLOR: #ff0000">value</SPAN><SPAN
style="COLOR: #0000ff">="Submit"</SPAN><SPAN
style="COLOR: #0000ff">/></SPAN><SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">s:form</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN style="COLOR: #800000">body</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN style="COLOR: #800000">html</SPAN><SPAN
style="COLOR: #0000ff">></SPAN></DIV><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">例4 Login.jsp</SPAN><BR><BR>
<DIV
style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><SPAN
style="COLOR: #0000ff"><</SPAN><SPAN style="COLOR: #800000">action
</SPAN><SPAN style="COLOR: #ff0000">name</SPAN><SPAN
style="COLOR: #0000ff">="Login"</SPAN><SPAN style="COLOR: #ff0000">
class</SPAN><SPAN style="COLOR: #0000ff">="tutorial.Login"</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR>
</SPAN><SPAN style="COLOR: #0000ff"><</SPAN><SPAN
style="COLOR: #800000">result</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN
style="COLOR: #000000">/HelloWorld.jsp</SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">result</SPAN><SPAN
style="COLOR: #0000ff">></SPAN><SPAN style="COLOR: #000000"><BR></SPAN><SPAN
style="COLOR: #0000ff"></</SPAN><SPAN
style="COLOR: #800000">action</SPAN><SPAN
style="COLOR: #0000ff">></SPAN></DIV><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">例4 classes/struts.xml中Login
Action的配置</SPAN><BR><BR>运行Tomcat，在浏览器地址栏中键入<A
href="http://localhost:8080/Struts2_Action/Login.jsp">http://localhost:8080/Struts2_Action/Login.jsp</A>，出现如图4所示页面。<BR><BR><IMG
alt="图4 Login.jsp输出页面"
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/r_img_4.gif"><BR><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">图4
Login.jsp输出页面</SPAN><BR><BR>分别在User
name中输入“max”和“secret”，点击“Submit”按钮，出现如图5所示页面。<BR><BR><IMG alt="图5 Login成功页面"
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/r_img_5.gif"><BR><SPAN
style="FONT-STYLE: italic"></SPAN><EM><SPAN style="FONT-SIZE: smaller">图5
Login成功页面</SPAN></EM><BR><BR>在浏览器地址栏中键入<A
href="http://localhost:8080/Struts2_Action/Login.jsp">http://localhost:8080/Struts2_Action/Login.jsp</A>，分别在User
name中输入“Scott”和“password”，点击“Submit”按钮，出现如图6所示页面。<BR><BR><IMG alt="图6 Login失败页面"
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/r_img_6.gif"><BR><SPAN
style="FONT-SIZE: smaller; FONT-STYLE: italic">图6 Login失败页面</SPAN>
<P>Struts
2.0更厉害的是支持更高级的POJO访问，如user.getPassword()。我们可以用另一写法实现例4。首先，将name和password从Login类中分离出来，到新建类User中。这样对我们开发多层系统尤其有用。它可以使系统结构更清晰。</P>
<DIV
style="BORDER-RIGHT: #cccccc 1px solid; PADDING-RIGHT: 5px; BORDER-TOP: #cccccc 1px solid; PADDING-LEFT: 4px; FONT-SIZE: 13px; PADDING-BOTTOM: 4px; BORDER-LEFT: #cccccc 1px solid; WIDTH: 98%; WORD-BREAK: break-all; PADDING-TOP: 4px; BORDER-BOTTOM: #cccccc 1px solid; BACKGROUND-COLOR: #eeeeee"><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/None.gif"
align=top><SPAN style="COLOR: #0000ff">package</SPAN><SPAN
style="COLOR: #000000"> tutorial;<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/None.gif"
align=top><BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/None.gif"
align=top></SPAN><SPAN style="COLOR: #0000ff">import</SPAN><SPAN
style="COLOR: #000000"> com.opensymphony.xwork2.ActionSupport;<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/None.gif"
align=top><BR><IMG id=Codehighlighter1_108_550_Open_Image
onclick="this.style.display='none'; Codehighlighter1_108_550_Open_Text.style.display='none'; Codehighlighter1_108_550_Closed_Image.style.display='inline'; Codehighlighter1_108_550_Closed_Text.style.display='inline';"
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onclick="this.style.display='none'; Codehighlighter1_108_550_Closed_Text.style.display='none'; Codehighlighter1_108_550_Open_Image.style.display='inline'; Codehighlighter1_108_550_Open_Text.style.display='inline';"
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/ContractedBlock.gif"
align=top></SPAN><SPAN style="COLOR: #0000ff">public</SPAN><SPAN
style="COLOR: #000000"></SPAN><SPAN style="COLOR: #0000ff">class</SPAN><SPAN
style="COLOR: #000000"> LoginX </SPAN><SPAN
style="COLOR: #0000ff">extends</SPAN><SPAN style="COLOR: #000000"> ActionSupport
</SPAN><SPAN id=Codehighlighter1_108_550_Closed_Text
style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/dot.gif"></SPAN><SPAN
id=Codehighlighter1_108_550_Open_Text><SPAN style="COLOR: #000000">{<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
</SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN
style="COLOR: #000000"> User user;<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
</SPAN><SPAN style="COLOR: #0000ff">private</SPAN><SPAN
style="COLOR: #000000"> String message;<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
<BR><IMG id=Codehighlighter1_189_212_Open_Image
onclick="this.style.display='none'; Codehighlighter1_189_212_Open_Text.style.display='none'; Codehighlighter1_189_212_Closed_Image.style.display='inline'; Codehighlighter1_189_212_Closed_Text.style.display='inline';"
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onclick="this.style.display='none'; Codehighlighter1_189_212_Closed_Text.style.display='none'; Codehighlighter1_189_212_Open_Image.style.display='inline'; Codehighlighter1_189_212_Open_Text.style.display='inline';"
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/ContractedSubBlock.gif"
align=top> </SPAN><SPAN style="COLOR: #0000ff">public</SPAN><SPAN
style="COLOR: #000000"></SPAN><SPAN style="COLOR: #0000ff">void</SPAN><SPAN
style="COLOR: #000000"> setUser(User user) </SPAN><SPAN
id=Codehighlighter1_189_212_Closed_Text
style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/dot.gif"></SPAN><SPAN
id=Codehighlighter1_189_212_Open_Text><SPAN style="COLOR: #000000">{<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
</SPAN><SPAN style="COLOR: #0000ff">this</SPAN><SPAN
style="COLOR: #000000">.user </SPAN><SPAN style="COLOR: #000000">=</SPAN><SPAN
style="COLOR: #000000"> user;<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/ExpandedSubBlockEnd.gif"
align=top> }</SPAN></SPAN><SPAN style="COLOR: #000000"><BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
<BR><IMG id=Codehighlighter1_239_257_Open_Image
onclick="this.style.display='none'; Codehighlighter1_239_257_Open_Text.style.display='none'; Codehighlighter1_239_257_Closed_Image.style.display='inline'; Codehighlighter1_239_257_Closed_Text.style.display='inline';"
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src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/ContractedSubBlock.gif"
align=top> </SPAN><SPAN style="COLOR: #0000ff">public</SPAN><SPAN
style="COLOR: #000000"> User getUser() </SPAN><SPAN
id=Codehighlighter1_239_257_Closed_Text
style="BORDER-RIGHT: #808080 1px solid; BORDER-TOP: #808080 1px solid; DISPLAY: none; BORDER-LEFT: #808080 1px solid; BORDER-BOTTOM: #808080 1px solid; BACKGROUND-COLOR: #ffffff"><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/dot.gif"></SPAN><SPAN
id=Codehighlighter1_239_257_Open_Text><SPAN style="COLOR: #000000">{<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
</SPAN><SPAN
style="COLOR: #0000ff">return</SPAN><SPAN style="COLOR: #000000"> user;<BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/ExpandedSubBlockEnd.gif"
align=top> }</SPAN></SPAN><SPAN style="COLOR: #000000"><BR><IMG
src="Struts 2_0的Action讲解 - Max On Java - BlogJava.files/InBlock.gif" align=top>
<BR><IMG id=Codehighlighter1_289_310_Open_Image
onclick="this.style.display='none'; Codehighlighter1_289_310_Open_Text.style.display='none'; Codehighlighter1_289_310_Closed_Image.style.display='inline'; Codehighlighter1_289_310_Closed_Text.style.display='inline';"
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