spring mvc表单数据绑定，对于基本类型和日期的处理WebDataBinder

因为对于原生基本类型的form表单绑定，会出错。需要指定具体的类型编辑器。用法如下：首先在BaseAction中增加方法initBinder，并使用注解@InitBinder标注，那么spring mvc在绑定表单之前，都会先注册这些编辑器。剩下的控制器都继承该类。CustomDateEditor spring自己提供了。

这个是基类BaseAction：

public class BaseAction {
@InitBinder
protected void initBinder(WebDataBinder binder) {
binder.registerCustomEditor(Date.class, new CustomDateEditor(new SimpleDateFormat("yyyy-MM-dd HH:mm:ss"), true));
binder.registerCustomEditor(int.class, new IntegerEditor());
binder.registerCustomEditor(long.class, new LongEditor());
binder.registerCustomEditor(double.class, new DoubleEditor());
binder.registerCustomEditor(float.class, new FloatEditor());
}
}

下面是各个编辑器类：

Spring提供了CustomNumberEditor，也可以不用些编辑器类。使用构造函数构造相应的编辑器类。

public class DoubleEditor extends PropertiesEditor {
@Override
public void setAsText(String text) throws IllegalArgumentException {
if (text == null || text.equals("")) {
text = "0";
}
setValue(Double.parseDouble(text));
}

@Override
public String getAsText() {
return getValue().toString();
}
}

import org.springframework.beans.propertyeditors.PropertiesEditor;

public class IntegerEditor extends PropertiesEditor {
@Override
public void setAsText(String text) throws IllegalArgumentException {
if (text == null || text.equals("")) {
text = "0";
}
setValue(Integer.parseInt(text));
}

@Override
public String getAsText() {
return getValue().toString();
}
}

public class LongEditor extends PropertiesEditor {
@Override
public void setAsText(String text) throws IllegalArgumentException {
if (text == null || text.equals("")) {
text = "0";
}
setValue(Long.parseLong(text));
}

@Override
public String getAsText() {
return getValue().toString();
}
}

public class FloatEditor extends PropertiesEditor {
@Override
public void setAsText(String text) throws IllegalArgumentException {
if (text == null || text.equals("")) {
text = "0";
}
setValue(Float.parseFloat(text));
}

@Override
public String getAsText() {
return getValue().toString();
}
}