Spring 版的 JpetStore 中的 AccountFormController 学习札记

Spring 版的 JpetStore 中的 AccountFormController 学习笔记
AccountFormController　这个控制器在JpetStore中应该算是比较难的一个控制器，我把我的心得体会记录下来
希望对一同学习JpetStroe的人有些帮助
我下的是spring-framework-2.0.6中自带的 ，如果我有写错或理解错的地方，请大家提醒一下.java 代码?

1. public?class?AccountFormController?extends?SimpleFormController?{??
2. ????private?Log?log?=?LogFactory.getLog(AccountFormController.class);??
3. ??
4. ????public?static?final?String[]?LANGUAGES?=?{?"english",?"japanese"?};??
5. ??
6. ????private?PetStoreFacade?petStore;??
7. ??
8. ????public?AccountFormController()?{??
9. ????????setSessionForm(true);??
10. ????????/*?
11. ?????????*?当设为false时就是不自动与?Validator?自动绑定，它会通过onBindAndValidate()这个方法?
12. ?????????*?去调用如getValidator().validate(account,?errors);?如果我们不调用前面的这个方法的话，?
13. ?????????*?那么AccountValidator这个验证器就不会执行，而setValidateOnBinding（）这里默认的是true?
14. ?????????*?而当这里调用的时候不会调用?Validator中的supports那个方法?
15. ?????????*/??
16. ????????setValidateOnBinding(false);??
17. ????????setCommandName("accountForm");??
18. ??
19. ????????//?这里设置啦当表单没有验证或者是表单验证没有通过时的?要到指定的*.jsp页面上去??
20. ????????setFormView("EditAccountForm");??
21. ????????log.info("****???AccountFormController()........\n");??
22. ??
23. ????}??
24. ??
25. ????public?void?setPetStore(PetStoreFacade?petStore)?{??
26. ????????this.petStore?=?petStore;??
27. ????}??
28. ??
29. ????/*?
30. ?????*?当初始化这个类的时候就会?调用这个方法并返回一个AccountForm对象供jsp页面绑定用?
31. ????*??再到onBindAndValidate?()去验证，才会调用验证器Validator?
32. ?????*/???
33. ????protected?Object?formBackingObject(HttpServletRequest?request)??
34. ????????????throws?Exception?{??
35. ????????UserSession?userSession?=?(UserSession)?WebUtils.getSessionAttribute(??
36. ????????????????request,?"userSession");??
37. ????????log.info("****???formBackingObject()........\n");?????????
38. ????????if?(userSession?!=?null)?{??
39. ????????????return?new?AccountForm(this.petStore.getAccount(userSession??
40. ????????????????????.getAccount().getUsername()));??
41. ????????}?else?{??
42. ????????????return?new?AccountForm();??
43. ????????}??
44. ????}??
45. ??
46. ????/*?
47. ?????*?在这里我们可以在实现啦Validator这个接口验证之前做一些做一些预先的处理?
48. ?????*/??
49. ????protected?void?onBindAndValidate(HttpServletRequest?request,??
50. ????????????Object?command,?BindException?errors)?throws?Exception?{??
51. ????????log.info("****??onBindAndValidate()........\n");??
52. ??????????
53. ????????AccountForm?accountForm?=?(AccountForm)?command;??
54. ????????Account?account?=?accountForm.getAccount();??
55. ????????if?(request.getParameter("account.listOption")?==?null)?{??
56. ????????????account.setListOption(false);??
57. ????????}??
58. ????????if?(request.getParameter("account.bannerOption")?==?null)?{??
59. ????????????account.setBannerOption(false);??
60. ????????}??
61. ????????/*?
62. ?????????*?设置我们将要用验证器去验证的一个对象，而这个对象呢就是AccountForm中的account?
63. ?????????*?如果这里不设的话，那么会在AccountValidator中找不到firstName.....这些字段的?
64. ?????????*?换句话说就是设一个将要验证的对象的子对象,其实在这里我们不设为account也可以的，?
65. ?????????*?如果不设的话，那么在AccountValidator中的?validate(Object?obj,?Errors?errors)?
66. ?????????*?中要写成ValidationUtils.rejectIfEmpty(errors,?
67. ?????????*?"account.firstName",...）;这种形式的，?
68. ?????????*?那么在调用的时候传accountForm去就可以啦,如getValidator().validate(accountForm,?
69. ?????????*?errors);?
70. ?????????*/??
71. ????????errors.setNestedPath("account");??
72. ??
73. ????????getValidator().validate(account,?errors);??
74. ????????//?getValidator().validate(accountForm,?errors);??
75. ??
76. ????????log.info("****?getValidator().validate(account,?errors);........\n");??
77. ????????/*?
78. ?????????*?这里要把它还原，要不然在下面的ValidationUtils.rejectIfEmpty(errors,?
79. ?????????*?"account.username",..）;?
80. ?????????*?将会出现错误,如果你这里不设回去的话，那么上面这句要改成ValidationUtils.rejectIfEmpty(errors,?
81. ?????????*?"username",..）;这样也可以.?但是还要在ValidationUtils.rejectIfEmpty(errors,?
82. ?????????*?"username",..）;这句的下面把它还原，要不然的话它回到?页面显示的时候会出现错误.?
83. ?????????*??
84. ?????????*/??
85. ????????errors.setNestedPath("");??
86. ??
87. ????????if?(accountForm.isNewAccount())?{??
88. ????????????account.setStatus("OK");??
89. ????????????ValidationUtils.rejectIfEmpty(errors,?"account.username","USER_ID_REQUIRED",?"User?ID?is?required.");??
90. ????????????/*?ValidationUtils.rejectIfEmpty(errors,"username","USER_ID_REQUIRED",?"User?ID?is?required.");?
91. ????????????*/??
92. ????????????log.info("****?after?ValidationUtils.rejectIfEmpty(errors,?"account.username",..)?........\n");??
93. ????????????errors.setNestedPath("");??
94. ????????????if?(account.getPassword()?==?null??
95. ????????????????????||?account.getPassword().length()?<?1??
96. ????????????????????||?!account.getPassword().equals(??
97. ????????????????????????????accountForm.getRepeatedPassword()))?{??
98. ????????????????errors.reject("PASSWORD_MISMATCH",??
99. ????????????????????????????????"Passwords?did?not?match?or?were?not?provided.?Matching?passwords?are?required.");??
100. ????????????}??
101. ????????}?else?if?(account.getPassword()?!=?null??
102. ????????????????&&?account.getPassword().length()?>?0)?{??
103. ????????????if?(!account.getPassword().equals(accountForm.getRepeatedPassword()))?{??
104. ????????????????errors.reject("PASSWORD_MISMATCH",??
105. ????????????????????????????????"Passwords?did?not?match.?Matching?passwords?are?required.");??
106. ????????????}??
107. ????????}??
108. ????}??
109. ??
110. ????/*?
111. ?????*?如果验证通过就不会再调用这个方法，还有就是每次进入这个页面时都会调用一次这个方法,而这个方法在这里就是绑定一些?下拉菜单中的数据?
112. ?????*/??
113. ????protected?Map?referenceData(HttpServletRequest?request)?throws?Exception?{??
114. ????????log.info("****???referenceData()........\n");??
115. ????????Map?model?=?new?HashMap();??
116. ????????model.put("languages",?LANGUAGES);??
117. ????????model.put("categories",?this.petStore.getCategoryList());??
118. ????????return?model;??
119. ????}??
120. ??
121. ????//?只有当我们验证通过的时候才会调用这个方法??
122. ????protected?ModelAndView?onSubmit(HttpServletRequest?request,??
123. ????????????HttpServletResponse?response,?Object?command,?BindException?errors)??
124. ????????????throws?Exception?{??
125. ????????log.info("****???onSubmit()........\n");??
126. ????????AccountForm?accountForm?=?(AccountForm)?command;??
127. ??
128. ????????try?{??
129. ????????????if?(accountForm.isNewAccount())?{??
130. ????????????????this.petStore.insertAccount(accountForm.getAccount());??
131. ????????????}?else?{??
132. ????????????????this.petStore.updateAccount(accountForm.getAccount());??
133. ????????????}??
134. ????????}?catch?(DataIntegrityViolationException?ex)?{??
135. ????????????errors.rejectValue("account.username",?"USER_ID_ALREADY_EXISTS",??
136. ????????????????????"User?ID?already?exists:?choose?a?different?ID.");??
137. ????????????return?showForm(request,?response,?errors);??
138. ????????}??
139. ??
140. ????????UserSession?userSession?=?new?UserSession(this.petStore??
141. ????????????????.getAccount(accountForm.getAccount().getUsername()));??
142. ????????PagedListHolder?myList?=?new?PagedListHolder(this.petStore??
143. ????????????????.getProductListByCategory(accountForm.getAccount()??
144. ????????????????????????.getFavouriteCategoryId()));??
145. ????????myList.setPageSize(4);??
146. ????????userSession.setMyList(myList);??
147. ????????request.getSession().setAttribute("userSession",?userSession);??
148. ????????return?super.onSubmit(request,?response,?command,?errors);??
149. ????}??
150. ??
151. }??