FLY的狐狸

2015-04-03

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转自：http://blog.csdn.net/lxf9601/article/details/5925810

刚开始用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

/**

* Actually register the default editors for this registry instance.

private void doRegisterDefaultEditors() {

this.defaultEditors = new HashMap<Class, PropertyEditor>(64);

// Simple editors, without parameterization capabilities.

// The JDK does not contain a default editor for any of these target types.

this.defaultEditors.put(Charset.class, new CharsetEditor());

this.defaultEditors.put(Class.class, new ClassEditor());

this.defaultEditors.put(Class[].class, new ClassArrayEditor());

this.defaultEditors.put(Currency.class, new CurrencyEditor());

this.defaultEditors.put(File.class, new FileEditor());

this.defaultEditors.put(InputStream.class, new InputStreamEditor());

this.defaultEditors.put(Locale.class, new LocaleEditor());

this.defaultEditors.put(Pattern.class, new PatternEditor());

this.defaultEditors.put(Properties.class, new PropertiesEditor());

this.defaultEditors.put(Resource[].class, new ResourceArrayPropertyEditor());

this.defaultEditors.put(TimeZone.class, new TimeZoneEditor());

this.defaultEditors.put(URI.class, new URIEditor());

this.defaultEditors.put(URL.class, new URLEditor());

// Default instances of collection editors.

// Can be overridden by registering custom instances of those as custom editors.

this.defaultEditors.put(Collection.class, new CustomCollectionEditor(Collection.class));

this.defaultEditors.put(Set.class, new CustomCollectionEditor(Set.class));

this.defaultEditors.put(SortedSet.class, new CustomCollectionEditor(SortedSet.class));

this.defaultEditors.put(List.class, new CustomCollectionEditor(List.class));

this.defaultEditors.put(SortedMap.class, new CustomMapEditor(SortedMap.class));

// Default editors for primitive arrays.

this.defaultEditors.put(byte[].class, new ByteArrayPropertyEditor());

this.defaultEditors.put(char[].class, new CharArrayPropertyEditor());

// The JDK does not contain a default editor for char!

this.defaultEditors.put(char.class, new CharacterEditor(false));

this.defaultEditors.put(Character.class, new CharacterEditor(true));

// Spring's CustomBooleanEditor accepts more flag values than the JDK's default editor.

this.defaultEditors.put(boolean.class, new CustomBooleanEditor(false));

this.defaultEditors.put(Boolean.class, new CustomBooleanEditor(true));

// The JDK does not contain default editors for number wrapper types!

// Override JDK primitive number editors with our own CustomNumberEditor.

this.defaultEditors.put(byte.class, new CustomNumberEditor(Byte.class, false));

this.defaultEditors.put(Byte.class, new CustomNumberEditor(Byte.class, true));

this.defaultEditors.put(short.class, new CustomNumberEditor(Short.class, false));

this.defaultEditors.put(Short.class, new CustomNumberEditor(Short.class, true));

this.defaultEditors.put(int.class, new CustomNumberEditor(Integer.class, false));

this.defaultEditors.put(Integer.class, new CustomNumberEditor(Integer.class, true));

this.defaultEditors.put(long.class, new CustomNumberEditor(Long.class, false));

this.defaultEditors.put(Long.class, new CustomNumberEditor(Long.class, true));

this.defaultEditors.put(float.class, new CustomNumberEditor(Float.class, false));

this.defaultEditors.put(Float.class, new CustomNumberEditor(Float.class, true));

this.defaultEditors.put(double.class, new CustomNumberEditor(Double.class, false));

this.defaultEditors.put(Double.class, new CustomNumberEditor(Double.class, true));

this.defaultEditors.put(BigDecimal.class, new CustomNumberEditor(BigDecimal.class, true));

this.defaultEditors.put(BigInteger.class, new CustomNumberEditor(BigInteger.class, true));

// Only register config value editors if explicitly requested.

if (this.configValueEditorsActive) {

StringArrayPropertyEditor sae = new StringArrayPropertyEditor();

this.defaultEditors.put(String[].class, sae);

this.defaultEditors.put(short[].class, sae);

this.defaultEditors.put(int[].class, sae);

this.defaultEditors.put(long[].class, sae);

}

1.基本数据类型

很简单,该怎么写就怎么写.

controller代码

@RequestMapping

public void test1(String name, Integer age, Double income, Boolean isMarried, String[] interests)

{

System.out.println("简单数据类型绑定=========");

System.out.println("名字:" + name);

System.out.println("年龄:" + age);

System.out.println("收入:" + income);

System.out.println("已结婚:" + isMarried);

System.out.println("兴趣:");

for (String interest : interests)

{

System.out.println(interest);

}

System.out.println("====================");

}

jsp代码

<input type="radio" name="isMarried" value="true" checked="checked"/>是

<input type="checkbox" name="interests" value="听歌" checked="checked"/>听歌

<input type="checkbox" name="interests" value="书法" checked="checked"/>书法

<input type="checkbox" name="interests" value="看电影" checked="checked"/>看电影

</div>

</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

@RequestMapping

public void test2(User user)

{

System.out.println("简单对象类型绑定=========");

System.out.println("名字:" + user.getName());

System.out.println("年龄:" + user.getAge());

System.out.println("收入:" + user.getIncome());

System.out.println("已结婚:" + user.getIsMarried());

System.out.println("========================");

}

user代码

public class User {

private String name;

private Integer age;

private Boolean isMarried;

private Double income;

private String[] interests;

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public Integer getAge() {

return age;

}

public void setAge(Integer age) {

this.age = age;

}

public Boolean getIsMarried() {

return isMarried;

}

public void setIsMarried(Boolean isMarried) {

this.isMarried = isMarried;

}

public Double getIncome() {

return income;

}

public void setIncome(Double income) {

this.income = income;

}

public String[] getInterests() {

return interests;

}

public void setInterests(String[] interests) {

this.interests = interests;

}

jsp代码

<input type="radio" name="isMarried" value="true" checked="checked"/>是

<input type="checkbox" name="interests" value="听歌" checked="checked"/>听歌

<input type="checkbox" name="interests" value="书法" checked="checked"/>书法

<input type="checkbox" name="interests" value="看电影" checked="checked"/>看电影

</div>

</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

@RequestMapping

public void test3(Club club)

{

System.out.println("list类型绑定=========");

System.out.println("会员:");

for (User user : club.getUsers())

{

System.out.println(user.getName());

}

System.out.println("========================");

}

Club代码

public class Club {

private List<User> users = new ArrayList<User>();

public List<User> getUsers() {

return users;

}

public void setUsers(List<User> users) {

this.users = users;

}

jsp代码

</div>

</div>

</div>

</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

@RequestMapping

public void test4(Club2 club)

{

System.out.println("set类型绑定=========");

System.out.println("会员:");

for (User user : club.getUsers())

{

System.out.println(user.getName());

}

System.out.println("========================");

}

Club2代码

public class Club2 {

private Set<User> users = new LinkedHashSet<User>();

public Club2() {

users.add(new User());

}

public Set<User> getUsers() {

return users;

}

public void setUsers(Set<User> users) {

this.users = users;

}

jsp代码

</div>

</div>

</div>

</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

@RequestMapping

public void test5(UserForm userForm)

{

System.out.println("Map类型绑定=========");

System.out.println("名字:" + userForm.getUser().get("name"));

System.out.println("年龄:" + userForm.getUser().get("age"));

System.out.println("收入:" + userForm.getUser().get("income"));

System.out.println("已结婚:" + userForm.getUser().get("isMarried"));

System.out.println("========================");

}

UserForm.java代码

public class UserForm {

private Map<String, String> userMap = new LinkedHashMap<String, String>();

private User user = new User();

public Map<String, String> getUserMap() {

return userMap;

}

public void setUserMap(Map<String, String> userMap) {

this.userMap = userMap;

}

public User getUser() {

return user;

}

public void setUser(User user) {

this.user = user;

}

jsp代码

<input type="radio" name="user['isMarried']" value="true" checked="checked"/>是

</form>

6.复合类型绑定

controller代码

@RequestMapping

public void test6(UserForm userForm)

{

System.out.println("复合类型绑定=========");

System.out.println("名字:" + userForm.getUser().getName());

System.out.println("年龄:" + userForm.getUser().getAge());

System.out.println("收入:" + userForm.getUser().getIncome());

System.out.println("已结婚:" + userForm.getUser().getIsMarried());

System.out.println("========================");

}

UserForm代码

public class UserForm {

private Map<String, String> userMap = new LinkedHashMap<String, String>();

private User user = new User();

public Map<String, String> getUserMap() {

return userMap;

}

public void setUserMap(Map<String, String> userMap) {

this.userMap = userMap;

}

public User getUser() {

return user;

}

public void setUser(User user) {

this.user = user;

}

jsp代码

<input type="radio" name="user.isMarried" value="true" checked="checked"/>是

</form>

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