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利用Velocity Tools2.0 轻便构建Web工

发布时间： 2012-07-02 17:46:22 作者： rapoo

利用Velocity Tools2.0 轻松构建Web工程

转自:http://huangyunzeng.iteye.com/blog/1165744

利用Velocity Tools2.0 轻松构建Web工程博客分类：?
  • Java
  • Velocity
  • J2EEVelocityToolsjavaWEBjsp

    1、下载Velocity Tools2.0，给出下载链接：http://velocity.apache.org/download.cgi

    2、新建web工程，将velocityTools2.0的jar包添加进工程的lib中。

    3、修改web.xml文件，修改后的文件是这样的：

    Xml代码??利用Velocity Tools2.0 轻便构建Web工程
    1. <?xml?version="1.0"?encoding="UTF-8"?>??
    2. <!DOCTYPE?web-app?PUBLIC?"-//Sun?Microsystems,?Inc.//DTD?Web?Application?2.2//EN"?"http://java.sun.com/j2ee/dtds/web-app_2_2.dtd">??
    3. ??
    4. <!--??
    5. ?Licensed?to?the?Apache?Software?Foundation?(ASF)?under?one??
    6. ?or?more?contributor?license?agreements.??See?the?NOTICE?file??
    7. ?distributed?with?this?work?for?additional?information??
    8. ?regarding?copyright?ownership.??The?ASF?licenses?this?file??
    9. ?to?you?under?the?Apache?License,?Version?2.0?(the??
    10. ?"License");?you?may?not?use?this?file?except?in?compliance??
    11. ?with?the?License.??You?may?obtain?a?copy?of?the?License?at??
    12. ??
    13. ???http://www.apache.org/licenses/LICENSE-2.0??
    14. ??
    15. ?Unless?required?by?applicable?law?or?agreed?to?in?writing,??
    16. ?software?distributed?under?the?License?is?distributed?on?an??
    17. ?"AS?IS"?BASIS,?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY??
    18. ?KIND,?either?express?or?implied.??See?the?License?for?the??
    19. ?specific?language?governing?permissions?and?limitations??
    20. ?under?the?License.??
    21. -->??
    22. ??
    23. <web-app>??
    24. ??<servlet>??
    25. ????<servlet-name>velocity</servlet-name>??
    26. ????<servlet-class>org.apache.velocity.tools.view.VelocityViewServlet</servlet-class>??
    27. ??</servlet>??
    28. ??<servlet-mapping>??
    29. ????<servlet-name>velocity</servlet-name>??
    30. ????<url-pattern>*.vm</url-pattern>??
    31. ??</servlet-mapping>??
    32. ??<welcome-file-list>??
    33. ????<welcome-file>index.vm</welcome-file>??
    34. ??</welcome-file-list>??
    35. </web-app>??

    ?

    4、新建一个java包com.stone.velocity。

    5、新建一个javaBean ,类似这样的：

    Java代码??利用Velocity Tools2.0 轻便构建Web工程
    1. package?com.stone.velocity;??
    2. ??
    3. public?class?ToyTool??
    4. {??
    5. ????private?String?message?=?"Hello?from?ToyTool!";??
    6. ??
    7. ????public?String?getMessage()??
    8. ????{??
    9. ????????return?message;??
    10. ????}??
    11. ??
    12. ????public?void?setMessage(String?m)??
    13. ????{??
    14. ????????message?=?m;??
    15. ????}??
    16. ??
    17. ????/**?To?test?exception?handling?in?templates.?*/??
    18. ????public?boolean?whine()?{??
    19. ????????throw?new?IllegalArgumentException();??
    20. ????}??
    21. ??
    22. }??

    ?

    6、编写tools.xml。

    Xml代码??利用Velocity Tools2.0 轻便构建Web工程
    1. <?xml?version="1.0"?>??
    2. ??
    3. <!--??
    4. ?Licensed?to?the?Apache?Software?Foundation?(ASF)?under?one??
    5. ?or?more?contributor?license?agreements.??See?the?NOTICE?file??
    6. ?distributed?with?this?work?for?additional?information??
    7. ?regarding?copyright?ownership.??The?ASF?licenses?this?file??
    8. ?to?you?under?the?Apache?License,?Version?2.0?(the??
    9. ?"License");?you?may?not?use?this?file?except?in?compliance??
    10. ?with?the?License.??You?may?obtain?a?copy?of?the?License?at??
    11. ??
    12. ???http://www.apache.org/licenses/LICENSE-2.0??
    13. ??
    14. ?Unless?required?by?applicable?law?or?agreed?to?in?writing,??
    15. ?software?distributed?under?the?License?is?distributed?on?an??
    16. ?"AS?IS"?BASIS,?WITHOUT?WARRANTIES?OR?CONDITIONS?OF?ANY??
    17. ?KIND,?either?express?or?implied.??See?the?License?for?the??
    18. ?specific?language?governing?permissions?and?limitations??
    19. ?under?the?License.??
    20. -->??
    21. ??
    22. <tools>??
    23. ????<data?type="boolean"?key="xhtml"?value="true"/>??
    24. ????<data?type="boolean"?key="isSimple"?value="true"/>??
    25. ????<data?type="number"?key="version"?value="2.0"/>??
    26. ????<data?key="foo">this?is?foo</data>??
    27. ????<data?key="bar">this?is?bar.</data>??
    28. ????<toolbox?scope="request">??
    29. ????????<tool?key="toytool"?class="com.stone.velocity.ToyTool"?restrictTo="index*"/>??
    30. ????</toolbox>??
    31. ????<toolbox?scope="session">??
    32. ????????<tool?key="map"?class="java.util.HashMap"/>??
    33. ????</toolbox>??
    34. </tools>??

    ?

    7、创建index.vm和index.jsp,注意这两个文件放在WEBROOT下，如果放在别的地方，注意修改web.xml中的相关设置。

    8、index.vm

    Java代码??利用Velocity Tools2.0 轻便构建Web工程
    1. <html>??
    2. <body>??
    3. ??
    4. I'm?a?velocity?template?processed?using?the?VelocityViewServlet.??
    5. ??
    6. #if(?$XHTML?)??
    7. ??#set(?$br?=?"<br?/>"?)??
    8. #else??
    9. ??#set(?$br?=?"<br>"?)??
    10. #end??
    11. ??
    12. $br??
    13. $br??
    14. ??
    15. Here?we?use?a?custom?tool:?$toytool.message??
    16. ??
    17. $br??
    18. $br??
    19. ??
    20. Lets?count?:?#foreach($i?in?[1..5])$i?#end??
    21. ??
    22. $br??
    23. $br??
    24. ??
    25. Let's?play?with?a?hashmap:$br??
    26. first?add?foo:?$map.put("foo",$foo)$br??
    27. then?add?bar:?$map.put("bar",$bar)$br??
    28. $br??
    29. and?that?gives?us?$map??
    30. ??
    31. $br??
    32. $br??
    33. ??
    34. Here?we?get?the?date?from?the?DateTool:??$date.medium??
    35. ??
    36. $br??
    37. $br??
    38. ??
    39. #if(?$isSimple?)??
    40. This?is?simple#if(?$XHTML?)?xhtml#end?app?version?${version}.??
    41. #end??
    42. ??
    43. $br??
    44. $br??
    45. ??
    46. Click?<a?href="index.jsp">here</a>?to?see?the?VelocityViewTag?handle?the?same?VTL?markup.??
    47. ??
    48. </body>??
    49. </html>??

    ?

    9、index.jsp.

    Java代码??利用Velocity Tools2.0 轻便构建Web工程
    1. <html>??
    2. <body>??
    3. ??
    4. I'm?a?JSP?file?that?uses?the?VelocityViewTag.??
    5. ??
    6. <velocity:view>??
    7. #if(?$XHTML?)??
    8. ??#set(?$br?=?"<br?/>"?)??
    9. #else??
    10. ??#set(?$br?=?"<br>"?)??
    11. #end??
    12. ??
    13. $br??
    14. $br??
    15. ??
    16. Here?we?use?a?custom?tool:?$toytool.message??
    17. ??
    18. $br??
    19. $br??
    20. ??
    21. Lets?count?:?#foreach($i?in?[1..5])$i?#end??
    22. ??
    23. $br??
    24. $br??
    25. ??
    26. Let's?play?with?a?hashmap:$br??
    27. first?add?foo:?$map.put("foo",$foo)$br??
    28. then?add?bar:?$map.put("bar",$bar)$br??
    29. $br??
    30. and?that?gives?us?$map??
    31. ??
    32. $br??
    33. $br??
    34. ??
    35. Here?we?get?the?date?from?the?DateTool:??$date.medium??
    36. ??
    37. $br??
    38. $br??
    39. ??
    40. #if(?$isSimple?)??
    41. This?is?simple#if(?$XHTML?)?xhtml#end?app?version?${version}.??
    42. #end??
    43. ??
    44. $br??
    45. $br??
    46. ??
    47. Click?<a?href="index.vm">here</a>?to?see?this?VTL?markup?as?a?normal?template.??
    48. ??
    49. </velocity:view>??
    50. </body>??
    51. </html>??

    ?

    10、发布工程并访问，是不是很简单！这里介绍的知识简单的集成方式，还有很多的高级功能，可参考相关文档！


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