在SPRING MVC3中，比如做REST时，经常要用JASON去解析，遇到了日期格式化的问题，

请看例子：


1） 比如有一个POJO

 package com.loiane.model;


import java.util.Date;


import org.codehaus.jackson.annotate.JsonAutoDetect;


@JsonAutoDetect

@Entity

public class Company {


 private int id;

 private double price;

 private String company;

 private Date date;

 private String size;

 private byte visible;

}


2）在controller中，返回一个MAP

 public @ResponseBody Map<String,List<Company>> view() throws Exception


3） 于是SPIRNG MVC返回如下的JSON字符：

 {"total":27,"data":[{"price":71.72,"company":"3m Co","visible":1,"id":1,"size":"large","date":1188615600000},{"price":29.01,"company":"Aloca

Inc","visible":0,"id":2,"size":"medium","date":1185937200000},{"price":83.81,"company":"Altria Group

Inc","visible":0,"id":3,"size":"large","date":1186110000000

。。。。。。。。。。。。。。。。


4） 可以看到，返回的时间格式不大好看


5）于是，可以这样设置：

 @JsonSerialize(using=JsonDateSerializer.class)

public Date getDate() {

 return date;

}

 其中 JsonDateSerializer是新编写的类，继承了JsonSerializer

 import java.io.IOException;

import java.text.SimpleDateFormat;

import java.util.Date;


import org.codehaus.jackson.JsonGenerator;

import org.codehaus.jackson.JsonProcessingException;

import org.codehaus.jackson.map.JsonSerializer;

import org.codehaus.jackson.map.SerializerProvider;

import org.springframework.stereotype.Component;

@Component

public class JsonDateSerializer extends JsonSerializer<Date>{


 private static final SimpleDateFormat dateFormat = new SimpleDateFormat("MM-dd-yyyy");


 @Override

 public void serialize(Date date, JsonGenerator gen, SerializerProvider provider)

 throws IOException, JsonProcessingException {


 String formattedDate = dateFormat.format(date);


 gen.writeString(formattedDate);

 }


}


 很简单，格式化一下，这下输出JSON就可以了

{"total":27,"data":[{"price":71.72,"company":"3m Co","visible":1,"id":1,"size":"large","date":"09-01-2007"},{"price":29.01,"company":"Aloca

Inc","visible":0,"id":2,"size":"medium","date":"08-01-2007"},{"price":83.81,"company":"Altria Group

Inc","visible":0,"id":3,"size":"large","date":"08-03-2007"},{"price":52.55,"company":"American Express Company","visible":1,"id":4,"size":"extra

large","date":"01-04-2008"},{"price":64.13,"company":"American International Group

Inc.","visible":1,"id":5,"size":"small","date":"03-04-2008"},{"price":31.61,"company":"AT&T Inc.","visible":0,"id":6,"size":"extra

large","date":"02-01-2008"},{"price":75.43,"company":"Boeing Co.","visible":1,"id":7,"size":"large","date":"01-01-2008"},{"price":67.27,"company":"Caterpillar

Inc.","visible":1,"id":8,"size":"medium","date":"12-03-2007"},{"price":49.37,"company":"Citigroup,

Inc.","visible":1,"id":9,"size":"large","date":"11-24-2007"},{"price":40.48,"company":"E.I. du Pont de Nemours and Company","visible":0,"id":10,"size":"extra

large","date":"05-09-2007"}],"success":true}