SpringMVC数据绑定实例详解资源-CSDN文库

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SpringMVC 数据绑定实例详解数据绑定实例详解

SpringMVC 数据绑定

查看spring源码可以看出spring支持转换的数据类型：

org.springframework.beans.PropertyEditorRegistrySupport:

/**

* Actually register the default editors for this registry instance.

private void createDefaultEditors() {

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(InputSource.class, new InputSourceEditor());

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());

this.defaultEditors.put(UUID.class, new UUIDEditor());

// 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);

}

下面挑选一些常用的数据类型，举例说明它们的绑定方式

1. 基本数据类型基本数据类型(以以int为例，其他类似为例，其他类似)：：

Controller代码：代码：

@RequestMapping("test.do")

public void test(int num) {

}

JSP表单代码：表单代码：

......

</form>

表单中input的name值和Controller的参数变量名保持一致，就能完成基本数据类型的数据绑定，如果不一致可以使用

@RequestParam标注实现。值得一提的是，如果Controller方法参数中定义的是基本数据类型，但是从jsp提交过来的数据为

null或者””的话，会出现数据转换的异常。也就是说，必须保证表单传递过来的数据不能为null或””，所以，在开发过程中，对

可能为空的数据，最好将参数数据类型定义成包装类型，具体参见下面的第二条。

2. 包装类型包装类型(以以Integer为例，其他类似为例，其他类似)：：

Controller代码：代码：

@RequestMapping("test.do")

public void test(Integer num) {

}

JSP表单代码：表单代码：

......

</form>

和基本数据类型基本一样，不同之处在于，JSP表单传递过来的数据可以为null或””，以上面代码为例，如果jsp中num为””或者

表单中无num这个input，那么，Controller方法参数中的num值则为null。

3. 自定义对象类型：自定义对象类型：

Model代码：代码：

public class User {

private String firstName;

private String lastName;

public String getFirstName() {

return firstName;

}

public void setFirstName(String firstName) {

this.firstName = firstName;

}

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