Spring 注解学习手札三 表单页面处理.docx
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Spring注解学习手札三表单页面处理
如果要说表单,最简单的就是用户登录页面了!
估计大多数做B/S出身的兄弟可能写的第一个表单就是登录表单了!
今天,我也不例外,做一个登录验证实现!
首先,改造一下账户类Account,增加一个id字段:
Account.java
Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.domain;
5.
6.import java.io.Serializable;
7.
8./**
9. * 账户
10. *
11. * @author zlex.dongliang@">梁栋
12. * @version 1.0
13. * @since 1.0
14. */
15.public class Account implements Serializable {
16.
17. /**
18. *
19. */
20. private static final long serialVersionUID = -533698031946372178L;
21.
22. /**
23. * 主键
24. */
25. private int id;
26. /**
27. * 用户名
28. */
29. private String username;
30. /**
31. * 密码
32. */
33. private String password;
34.
35.
36.
37. public Account() {
38. }
39.
40. /**
41. * @param id
42. */
43. public Account(int id) {
44. this.id = id;
45. }
46.
47. // get、set方法省略
48.
49.}
接下来,为了协调逻辑处理,我们改造接口AccountService及其实现类AccountServiceImpl:
AccountService.java
Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.service;
5.
6.import org.springframework.transaction.annotation.Transactional;
7.import org.zlex.spring.domain.Account;
8.
9./**
10. * 账户业务接口
11. *
12. * @author zlex.dongliang@">梁栋
13. * @version 1.0
14. * @since 1.0
15. */
16.@Transactional
17.public interface AccountService {
18.
19. /**
20. * 获得账户
21. *
22. * @param username
23. * @param password
24. * @return
25. */
26. Account read(String username, String password);
27.
28. /**
29. * 获得账户
30. *
31. * @param id
32. * @return
33. */
34. Account read(int id);
35.}
我们暂时抛开AccountDao该做的事情,在AccountServiceImpl中完成数据提取:
AccountServiceImpl.java
Java代码
1./**
2. * 2010-1-23
3. */
4.package org.zlex.spring.service.impl;
5.
6.import org.springframework.beans.factory.annotation.Autowired;
7.import org.springframework.stereotype.Service;
8.import org.zlex.spring.dao.AccountDao;
9.import org.zlex.spring.domain.Account;
10.import org.zlex.spring.service.AccountService;
11.
12./**
13. * 账户业务
14. *
15. * @author zlex.dongliang@">梁栋
16. * @version 1.0
17. * @since 1.0
18. */
19.@Service
20.public class AccountServiceImpl implements AccountService {
21.
22. @Autowired
23. private AccountDao accountDao;
24.
25. @Override
26. public Account read(String username, String password) {
27. Account account = null;
28. if (username.equals("snowolf") && password.equals("zlex")) {
29. account = new Account();
30. account.setId
(1);
31. account.setUsername(username);
32. account.setPassword(password);
33. }
34. return account;
35. }
36.
37. @Override
38. public Account read(int id) {
39. Account account = new Account();
40. account.setId
(1);
41. account.setUsername("snowolf");
42. account.setPassword("zlex");
43. return account;
44. }
45.}
先来一个账户信息的展示,构建一个控制器ProfileController:
ProfileController.java
Java代码
1./**
2. * 2010-1-26
3. */
4.package org.zlex.spring.controller;
5.
6.import org.springframework.beans.factory.annotation.Autowired;
7.import org.springframework.stereotype.Controller;
8.import org.springframework.ui.ModelMap;
9.import org.springframework.web.bind.annotation.RequestMapping;
10.import org.springframework.web.bind.annotation.RequestMethod;
11.import org.springframework.web.bind.annotation.RequestParam;
12.import org.zlex.spring.domain.Account;
13.import org.zlex.spring.service.AccountService;
14.
15./**
16. * 账户信息控制器
17. *
18. * @author zlex.dongliang@">梁栋
19. * @version 1.0
20. * @since 1.0
21. */
22.@Controller
23.@RequestMapping(value = "/profile.do")
24.public class ProfileController {
25. @Autowired
26. private AccountService accountService;
27.
28. /**
29. * 账户信息展示
30. *
31. * @param id
32. * @param model
33. * @return
34. */
35. @RequestMapping(method = RequestMethod.GET)
36. public String profile(@RequestParam("id") int id, ModelMap model) {
37. Account account = accountService.read(id);
38. model.addAttribute("account", account);
39.
40. // 跳转到用户信息页面
41. return "account/profile";
42. }
43.}
@RequestMapping(value="/profile.do")为该控制器绑定url(/profile.do)
@RequestMapping(method=RequestMethod.GET)指定为GET请求
model.addAttribute("account",account);绑定账户
return"account/profile";跳转到“/WEB-INF/page/account/porfile.jsp”页面
对应构建这个页面:
porfile.jsp
Jsp代码
1.
账户信息已经绑定在response的属性上。
自然,使用out/>标签就可以获得账户信息内容。
访问地址http:
//localhost:
8080/spring/profile.do?
id=1,结果如图所示:
接着构建一个登录控制器LoginController
LoginController.java
Java代码
1./**
2. * 2010-1-25
3. */
4.package org.zlex.spring.controller;
5.
6.import org.springframework.beans.factory.annotation.Autowired;
7.import org.springframework.stereotype.Controller;
8.import org.springframework.ui.ModelMap;
9.import org.springframework.web.bind.annotation.ModelAttribute;
10.import org.springframework.web.bind.annotation.RequestMapping;
11.import org.springframework.web.bind.annotation.RequestMethod;
12.import org.zlex.spring.domain.Account;
13.import org.zlex.spring.service.AccountService;
14.
15./**
16. * 登录控制器
17. *
18. * @author zlex.dongliang@">梁栋
19. * @version 1.0
20. * @since 1.0
21. */
22.@Controller
23.@RequestMapping(value = "/login.do")
24.public class LoginController {
25.
26. @Autowired
27. private AccountService accountService;
28.
29. /**
30. * 初始化表单
31. *
32. * @param model
33. * @return
34. */
35. @RequestMapping(method = RequestMethod.GET)
36. public String initForm(ModelMap model) {
37. Account account = new Account();
38. model.addAttribute("account", account);
39. // 直接跳转到登录页面
40. return "account/login";
41. }
42.
43. /**
44. * 登录
45. *
46. * @param account
47. * @return
48. */
49. @RequestMapping(method = RequestMethod.POST)
50. public String login(@ModelAttribute("account") Account account) {
51. Account acc = accountService.read(account.getUsername(), account
52. .getPassword());
53. if (acc !
= null) {
54. return "redirect:
profile.do?
id=" + acc.getId();
55. } else {
56. return "redirect:
login.do";
57. }
58. }
59.}
分段详述,先说初始化表单:
Java代码
1./**
2. * 初始化表单
3. *
4. * @param model
5. * @return
6. */
7.@RequestMapping(method = RequestMethod.GET)
8.public String initForm(ModelMap model) {
9. Account account = new Account();
10. model.addAttribute("account", account);
11. // 直接跳转到登录页面
12. return "account/login";
13.}
@RequestMapping(method=RequestMethod.GET)指定了GET请求方式,这与POST表单提交相对应!
model.addAttribute("account",account);绑定账户对象,也就是这个登录表单对象
return"account/login";指向登录页面
再看登录方法:
Java代码
1./**
2. * 登录
3. *
4. * @param account
5. * @return
6. */
7.@RequestMapping(method = RequestMethod.POST)
8.public String login(@ModelAttribute("account") Account account) {
9. Account acc = accountService.read(account.getUsername(), account
10. .getPassword());
11. if (acc !
= null) {
12. return "redirect:
profile.do?
id=" + acc.getId();
13. } else {
14. return "redirect:
login.do";
15. }
16.}
@RequestMapping(method=RequestMethod.POST)绑定POST表单提交请求
@ModelAttribute("account")Accountaccount绑定表单对象。
最后,再来看看页面:
login.jsp
Jsp代码
1.
6.
label path="password">密码:
label>password
7. path="password" />
8.
9.
10.
11.
12.
13.
form>
注意,formcommandName="account">必须指明commandName,且与表单初始化、提交方法中的表单对象名称保持一致!
页面目录结构如下图所示:
在页面中,我加入了一部分css效果,这部分代码我就不在这里唠叨了,大家可以看源码!
登录试试,如图:
用户名:
snwolf密码:
zlex
如果登录成功,我们就会跳转到之前的账户信息页面!
注解的确减少了代码的开发量,当然,这对于我们理解程序是一种挑战!
如果你不知道原有的SpringMVC的流程,很难一开始就能摆弄清楚这些内容!
完整代码见附件!