java与json日期问题

1、处理类：
public class DateJsonValueProcessor implements JsonValueProcessor{

private final String format="yyyy-MM-dd";
public Object processArrayValue(Object arg0, JsonConfig arg1) {
// TODO Auto-generated method stub
return null;
}

public Object processObjectValue(String key, Object value,JsonConfig arg2) {
if(value==null)
return "";
if (value instanceof Date) {
String str = new SimpleDateFormat(format).format((Date) value);
return str;
}
return value.toString();
}

}
jsonlib调用
JsonConfig cfg = new JsonConfig();
cfg.registerJsonValueProcessor(java.util.Date.class,new DateJsonValueProcessor()) ;

JSONArray jsonArray = JSONArray.fromObject(list,cfg);
2、 首先要写一个新的类JsonDateValueProcessor如下：

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/**
* JSON 日期格式处理（java转化为JSON）
* @author Michael sun
*/
public class JsonDateValueProcessor implements JsonValueProcessor {

/**
* datePattern
*/
private String datePattern = "yyyy-MM-dd";

/**
* JsonDateValueProcessor
*/
public JsonDateValueProcessor() {
super();
}

/**
* @param format
*/
public JsonDateValueProcessor(String format) {
super();
this.datePattern = format;
}

/**
* @param value
* @param jsonConfig
* @return Object
*/
public Object processArrayValue(Object value, JsonConfig jsonConfig) {
return process(value);
}

/**
* @param key
* @param value
* @param jsonConfig
* @return Object
*/
public Object processObjectValue(String key, Object value,
JsonConfig jsonConfig) {
return process(value);
}

/**
* process
* @param value
* @return
*/
private Object process(Object value) {
try {
if (value instanceof Date) {
SimpleDateFormat sdf = new SimpleDateFormat(datePattern,
Locale.UK);
return sdf.format((Date) value);
}
return value == null ? "" : value.toString();
} catch (Exception e) {
return "";
}

}

/**
* @return the datePattern
*/
public String getDatePattern() {
return datePattern;
}

/**
* @param pDatePattern the datePattern to set
*/
public void setDatePattern(String pDatePattern) {
datePattern = pDatePattern;
}

}

测试代码：

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JsonBean bean = new JsonBean();
bean.setName("NewBaby");
bean.setAge(1);
bean.setBorn(new Date());

JsonConfig jsonConfig = new JsonConfig();
jsonConfig.registerJsonValueProcessor(Date.class,new JsonDateValueProcessor());

JSONObject jo = JSONObject.fromObject(bean, jsonConfig);
System.out.println("bean->json:" + jo.toString());

打印结果：bean->json:{"age":1,"born":"2010-03-10","name":"NewBaby"}
这就能得到我们想要的结果了