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spring mvc 数据绑定总结

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08/15
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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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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

  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>