sprng mvc3 日期自动绑定

原文  http://blog.csdn.net/whumr1/article/details/8056285

 

使用spring的mvc,直接将页面参数绑定到对象中,对象中有属性为Date时会报错,此时需要处理下。

同样的,其他的需要处理的类型也可以用这种方法。

在controller中加入代码

 

@InitBinder
protected void initBinder(HttpServletRequest request,
                              ServletRequestDataBinder binder) throws Exception {
    //对于需要转换为Date类型的属性,使用DateEditor进行处理
    binder.registerCustomEditor(Date.class, new DateEditor());
}

 

 

 

DateEditor为自定义的处理类,继承自PropertyEditorSupport,处理方法为public void setAsText(String text) throws IllegalArgumentException

 

import org.springframework.util.StringUtils;

import java.beans.PropertyEditorSupport;
import java.text.DateFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class DateEditor extends PropertyEditorSupport {

    private static final DateFormat DATEFORMAT = new SimpleDateFormat("yyyy-MM-dd");
    private static final DateFormat TIMEFORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

    private DateFormat dateFormat;
    private boolean allowEmpty = true;

    public DateEditor() {
    }

    public DateEditor(DateFormat dateFormat) {
        this.dateFormat = dateFormat;
    }

    public DateEditor(DateFormat dateFormat, boolean allowEmpty) {
        this.dateFormat = dateFormat;
        this.allowEmpty = allowEmpty;
    }

    /**
     * Parse the Date from the given text, using the specified DateFormat.
     */
    @Override
    public void setAsText(String text) throws IllegalArgumentException {
        if (this.allowEmpty && !StringUtils.hasText(text)) {
            // Treat empty String as null value.
            setValue(null);
        } else {
            try {
                if(this.dateFormat != null)
                    setValue(this.dateFormat.parse(text));
                else {
                    if(text.contains(":"))
                        setValue(TIMEFORMAT.parse(text));
                    else
                        setValue(DATEFORMAT.parse(text));
                }
            } catch (ParseException ex) {
                throw new IllegalArgumentException("Could not parse date: " + ex.getMessage(), ex);
            }
        }
    }

    /**
     * Format the Date as String, using the specified DateFormat.
     */
    @Override
    public String getAsText() {
        Date value = (Date) getValue();
        DateFormat dateFormat = this.dateFormat;
        if(dateFormat == null)
            dateFormat = TIMEFORMAT;
        return (value != null ? dateFormat.format(value) : "");
    }
}

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