spring mvc 数据绑定总结

spring mvc 做web开发时,经常会不知道如何合适绑定页面数据.用惯struts2的朋友更认为spring mvc 绑定数据不如struts2方便(本人最开始也是这么认为),经过一段时间的应用和测试,总结出以下几种情况,希望对刚接触spring mvc 的朋友有所帮助.

示例程序下载

查看spring源码可以看出spring支持转换的数据类型已经很多了.

org.springframework.beans.PropertyEditorRegistrySupport.java

[java] view plaincopy

1. /**
2. * Actually register the default editors for this registry instance.
3. */
4. private void doRegisterDefaultEditors() {
5. this.defaultEditors = new HashMap<Class, PropertyEditor>(64);
6. // Simple editors, without parameterization capabilities.
7. // The JDK does not contain a default editor for any of these target types.
8. this.defaultEditors.put(Charset.class, new CharsetEditor());
9. this.defaultEditors.put(Class.class, new ClassEditor());
10. this.defaultEditors.put(Class[].class, new ClassArrayEditor());
11. this.defaultEditors.put(Currency.class, new CurrencyEditor());
12. this.defaultEditors.put(File.class, new FileEditor());
13. this.defaultEditors.put(InputStream.class, new InputStreamEditor());
14. this.defaultEditors.put(Locale.class, new LocaleEditor());
15. this.defaultEditors.put(Pattern.class, new PatternEditor());
16. this.defaultEditors.put(Properties.class, new PropertiesEditor());
17. this.defaultEditors.put(Resource[].class, new ResourceArrayPropertyEditor());
18. this.defaultEditors.put(TimeZone.class, new TimeZoneEditor());
19. this.defaultEditors.put(URI.class, new URIEditor());
20. this.defaultEditors.put(URL.class, new URLEditor());
21. // Default instances of collection editors.
22. // Can be overridden by registering custom instances of those as custom editors.
23. this.defaultEditors.put(Collection.class, new CustomCollectionEditor(Collection.class));
24. this.defaultEditors.put(Set.class, new CustomCollectionEditor(Set.class));
25. this.defaultEditors.put(SortedSet.class, new CustomCollectionEditor(SortedSet.class));
26. this.defaultEditors.put(List.class, new CustomCollectionEditor(List.class));
27. this.defaultEditors.put(SortedMap.class, new CustomMapEditor(SortedMap.class));
28. // Default editors for primitive arrays.
29. this.defaultEditors.put(byte[].class, new ByteArrayPropertyEditor());
30. this.defaultEditors.put(char[].class, new CharArrayPropertyEditor());
31. // The JDK does not contain a default editor for char!
32. this.defaultEditors.put(char.class, new CharacterEditor(false));
33. this.defaultEditors.put(Character.class, new CharacterEditor(true));
34. // Spring‘s CustomBooleanEditor accepts more flag values than the JDK‘s default editor.
35. this.defaultEditors.put(boolean.class, new CustomBooleanEditor(false));
36. this.defaultEditors.put(Boolean.class, new CustomBooleanEditor(true));
37. // The JDK does not contain default editors for number wrapper types!
38. // Override JDK primitive number editors with our own CustomNumberEditor.
39. this.defaultEditors.put(byte.class, new CustomNumberEditor(Byte.class, false));
40. this.defaultEditors.put(Byte.class, new CustomNumberEditor(Byte.class, true));
41. this.defaultEditors.put(short.class, new CustomNumberEditor(Short.class, false));
42. this.defaultEditors.put(Short.class, new CustomNumberEditor(Short.class, true));
43. this.defaultEditors.put(int.class, new CustomNumberEditor(Integer.class, false));
44. this.defaultEditors.put(Integer.class, new CustomNumberEditor(Integer.class, true));
45. this.defaultEditors.put(long.class, new CustomNumberEditor(Long.class, false));
46. this.defaultEditors.put(Long.class, new CustomNumberEditor(Long.class, true));
47. this.defaultEditors.put(float.class, new CustomNumberEditor(Float.class, false));
48. this.defaultEditors.put(Float.class, new CustomNumberEditor(Float.class, true));
49. this.defaultEditors.put(double.class, new CustomNumberEditor(Double.class, false));
50. this.defaultEditors.put(Double.class, new CustomNumberEditor(Double.class, true));
51. this.defaultEditors.put(BigDecimal.class, new CustomNumberEditor(BigDecimal.class, true));
52. this.defaultEditors.put(BigInteger.class, new CustomNumberEditor(BigInteger.class, true));
53. // Only register config value editors if explicitly requested.
54. if (this.configValueEditorsActive) {
55. StringArrayPropertyEditor sae = new StringArrayPropertyEditor();
56. this.defaultEditors.put(String[].class, sae);
57. this.defaultEditors.put(short[].class, sae);
58. this.defaultEditors.put(int[].class, sae);
59. this.defaultEditors.put(long[].class, sae);
60. }
61. }

1.基本数据类型

很简单,该怎么写就怎么写.

controller代码

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1. @RequestMapping
2. public void test1(String name, Integer age, Double income, Boolean isMarried, String[] interests)
3. {
4. System.out.println("简单数据类型绑定=========");
5. System.out.println("名字:" + name);
6. System.out.println("年龄:" + age);
7. System.out.println("收入:" + income);
8. System.out.println("已结婚:" + isMarried);
9. System.out.println("兴趣:");
10. for (String interest : interests)
11. {
12. System.out.println(interest);
13. }
14. System.out.println("====================");
15. }

jsp代码

[xhtml] view plaincopy

1. <form action="test1.do" method="post">
2. <div class="f_left">姓名:</div>
3. <div class="f_left"><input name="name" value="张三"/></div>
4. <div class="clear"></div>
5. <div class="f_left">年龄:</div>
6. <div class="f_left"><input name="age" value="20"/></div>
7. <div class="clear"></div>
8. <div class="f_left">收入:</div>
9. <div class="f_left"><input name="income" value="100000"/></div>
10. <div class="clear"></div>
11. <div class="f_left">结婚:</div>
12. <div class="f_left">
13. <input type="radio" name="isMarried" value="true" checked="checked"/>是
14. <input type="radio" name="isMarried" value="false"/>否</div>
15. <div class="clear"></div>
16. <div class="f_left">兴趣:</div>
17. <div class="f_left">
18. <input type="checkbox" name="interests" value="听歌" checked="checked"/>听歌
19. <input type="checkbox" name="interests" value="书法" checked="checked"/>书法
20. <input type="checkbox" name="interests" value="看电影" checked="checked"/>看电影
21. </div>
22. <div class="clear"></div>
23. <div><input type="submit" value="提交表单"/></div>
24. </form>

2.简单对象类型

与基本类型相拟,只不过绑定到对象上更加简洁.(类拟struts的ActionForm)

controller代码

[java] view plaincopy

1. @RequestMapping  
2.     public void test2(User user)  
3.     {  
4.         System.out.println("简单对象类型绑定=========");  
5.         System.out.println("名字:" + user.getName());  
6.         System.out.println("年龄:" + user.getAge());  
7.         System.out.println("收入:" + user.getIncome());  
8.         System.out.println("已结婚:" + user.getIsMarried());  
9.         System.out.println("========================");  
10.     }  

user代码

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1. public class User {
2. private String name;
3. private Integer age;
4. private Boolean isMarried;
5. private Double income;
6. private String[] interests;
7. public String getName() {
8. return name;
9. }
10. public void setName(String name) {
11. this.name = name;
12. }
13. public Integer getAge() {
14. return age;
15. }
16. public void setAge(Integer age) {
17. this.age = age;
18. }
19. public Boolean getIsMarried() {
20. return isMarried;
21. }
22. public void setIsMarried(Boolean isMarried) {
23. this.isMarried = isMarried;
24. }
25. public Double getIncome() {
26. return income;
27. }
28. public void setIncome(Double income) {
29. this.income = income;
30. }
31. public String[] getInterests() {
32. return interests;
33. }
34. public void setInterests(String[] interests) {
35. this.interests = interests;
36. }
37. }

jsp代码

[xhtml] view plaincopy

1. <form action="test2.do" method="post">  
2.         <div class="f_left">姓名:</div>  
3.         <div class="f_left"><input name="name" value="lxf"/></div>  
4.         <div class="clear"></div>  
5.         <div class="f_left">年龄:</div>  
6.         <div class="f_left"><input name="age" value="20"/></div>  
7.         <div class="clear"></div>  
8.         <div class="f_left">收入:</div>  
9.         <div class="f_left"><input name="income" value="100000"/></div>  
10.         <div class="clear"></div>  
11.         <div class="f_left">结婚:</div>  
12.         <div class="f_left">  
13.         <input type="radio" name="isMarried" value="true" checked="checked"/>是  
14.         <input type="radio" name="isMarried" value="false"/>否</div>  
15.         <div class="clear"></div>  
16.         <div class="f_left">兴趣:</div>  
17.         <div class="f_left">  
18.         <input type="checkbox" name="interests" value="听歌" checked="checked"/>听歌  
19.         <input type="checkbox" name="interests" value="书法" checked="checked"/>书法  
20.         <input type="checkbox" name="interests" value="看电影" checked="checked"/>看电影  
21.         </div>  
22.         <div class="clear"></div>  
23.         <div><input type="submit" value="提交表单"/></div>  
24.     </form>  

3.List类型绑定

网上很多人都给不出答案,关键在于,List需要绑定在对象(ActionForm),直接写在request-mapping函数的参数是不行的,更重要的一点是要创建对象(ArrayList).

controller代码

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1. @RequestMapping
2. public void test3(Club club)
3. {
4. System.out.println("list类型绑定=========");
5. System.out.println("会员:");
6. for (User user : club.getUsers())
7. {
8. System.out.println(user.getName());
9. }
10. System.out.println("========================");
11. }

Club代码

[java] view plaincopy

1. public class Club {
2. private List<User> users = new ArrayList<User>();
3. public List<User> getUsers() {
4. return users;
5. }
6. public void setUsers(List<User> users) {
7. this.users = users;
8. }
9. }

jsp代码

[xhtml] view plaincopy

1. <form action="test3.do" method="post">
2. <div class="f_left">会员1号:</div>
3. <div class="f_left">
4. <input name="users[0].name" value="张三"/>
5. </div>
6. <div class="clear"></div>
7. <div class="f_left">会员2号:</div>
8. <div class="f_left">
9. <input name="users[1].name" value="李四"/>
10. </div>
11. <div class="clear"></div>
12. <div class="f_left">会员3号:</div>
13. <div class="f_left">
14. <input name="users[2].name" value="王五"/>
15. </div>
16. <div class="clear"></div>
17. <div><input type="submit" value="提交表单"/></div>
18. </form>

4.Set类型绑定

与List类型相似,经测试表明,绑定Set数据时,必须先在Set对象中Add相应的数量的模型对象.

controller代码

[java] view plaincopy

1. @RequestMapping
2. public void test4(Club2 club)
3. {
4. System.out.println("set类型绑定=========");
5. System.out.println("会员:");
6. for (User user : club.getUsers())
7. {
8. System.out.println(user.getName());
9. }
10. System.out.println("========================");
11. }

Club2代码

[java] view plaincopy

1. public class Club2 {
2. private Set<User> users = new LinkedHashSet<User>();
3. public Club2() {
4. users.add(new User());
5. users.add(new User());
6. users.add(new User());
7. }
8. public Set<User> getUsers() {
9. return users;
10. }
11. public void setUsers(Set<User> users) {
12. this.users = users;
13. }
14. }

jsp代码

[xhtml] view plaincopy

1. <form action="test4.do" method="post">  
2.         <div class="f_left">会员1号:</div>  
3.         <div class="f_left">  
4.         <input name="users[0].name" value="张三"/>  
5.         </div>  
6.         <div class="clear"></div>  
7.         <div class="f_left">会员2号:</div>  
8.         <div class="f_left">  
9.         <input name="users[1].name" value="李四"/>  
10.         </div>  
11.         <div class="clear"></div>  
12.         <div class="f_left">会员3号:</div>  
13.         <div class="f_left">  
14.         <input name="users[2].name" value="王五"/>  
15.         </div>  
16.         <div class="clear"></div>  
17.         <div><input type="submit" value="提交表单"/></div>  
18.     </form>  

5.Map类型绑定

最灵活的一种方式,可无限绑定未定义的参数,注意必须绑定在对象下(ActionForm).

controller代码

[java] view plaincopy

1. @RequestMapping  
2.     public void test5(UserForm userForm)  
3.     {  
4.         System.out.println("Map类型绑定=========");  
5.         System.out.println("名字:" + userForm.getUser().get("name"));  
6.         System.out.println("年龄:" + userForm.getUser().get("age"));  
7.         System.out.println("收入:" + userForm.getUser().get("income"));  
8.         System.out.println("已结婚:" + userForm.getUser().get("isMarried"));  
9.         System.out.println("========================");  
10.     }  

UserForm.java代码

[java] view plaincopy

1. public class UserForm {  
2.     private Map<String, String> userMap = new LinkedHashMap<String, String>();  
3.     private User user = new User();  
4.       
5.     public Map<String, String> getUserMap() {  
6.         return userMap;  
7.     }  
8.     public void setUserMap(Map<String, String> userMap) {  
9.         this.userMap = userMap;  
10.     }  
11.     public User getUser() {  
12.         return user;  
13.     }  
14.     public void setUser(User user) {  
15.         this.user = user;  
16.     }  
17.       
18. }  

jsp代码

[xhtml] view plaincopy

1. <form action="test5.do" method="post">
2. <div class="f_left">姓名:</div>
3. <div class="f_left"><input name="user[‘name‘]" value="张三"/></div>
4. <div class="clear"></div>
5. <div class="f_left">年龄:</div>
6. <div class="f_left"><input name="user[‘age‘]" value="20"/></div>
7. <div class="clear"></div>
8. <div class="f_left">收入:</div>
9. <div class="f_left"><input name="user[‘income‘]" value="100000"/></div>
10. <div class="clear"></div>
11. <div class="f_left">结婚:</div>
12. <div class="f_left">
13. <input type="radio" name="user[‘isMarried‘]" value="true" checked="checked"/>是
14. <input type="radio" name="user[‘isMarried‘]" value="false"/>否</div>
15. <div class="clear"></div>
16. <div><input type="submit" value="提交表单"/></div>
17. </form>

6.复合类型绑定

controller代码

[java] view plaincopy

1. @RequestMapping  
2.     public void test6(UserForm userForm)  
3.     {  
4.         System.out.println("复合类型绑定=========");  
5.         System.out.println("名字:" + userForm.getUser().getName());  
6.         System.out.println("年龄:" + userForm.getUser().getAge());  
7.         System.out.println("收入:" + userForm.getUser().getIncome());  
8.         System.out.println("已结婚:" + userForm.getUser().getIsMarried());  
9.         System.out.println("========================");  
10.     }  

UserForm代码

[java] view plaincopy

1. public class UserForm {
2. private Map<String, String> userMap = new LinkedHashMap<String, String>();
3. private User user = new User();
4. public Map<String, String> getUserMap() {
5. return userMap;
6. }
7. public void setUserMap(Map<String, String> userMap) {
8. this.userMap = userMap;
9. }
10. public User getUser() {
11. return user;
12. }
13. public void setUser(User user) {
14. this.user = user;
15. }
16. }

jsp代码

[xhtml] view plaincopy

1. <form action="test6.do" method="post">
2. <div class="f_left">姓名:</div>
3. <div class="f_left"><input name="user.name" value="张三"/></div>
4. <div class="clear"></div>
5. <div class="f_left">年龄:</div>
6. <div class="f_left"><input name="user.age" value="20"/></div>
7. <div class="clear"></div>
8. <div class="f_left">收入:</div>
9. <div class="f_left"><input name="user.income" value="100000"/></div>
10. <div class="clear"></div>
11. <div class="f_left">结婚:</div>
12. <div class="f_left">
13. <input type="radio" name="user.isMarried" value="true" checked="checked"/>是
14. <input type="radio" name="user.isMarried" value="false"/>否</div>
15. <div class="clear"></div>
16. <div><input type="submit" value="提交表单"/></div>
17. </form>