public Date parseDate(String dateStr) throws IllegalArgumentException{    
  try {
        DateFormat df = getDateFormat();        // 這行代碼報錯了
        return df.parse(dateStr);
    } catch (ParseException e) {        
       throw new IllegalArgumentException(String.format(                            
       "Failed to parse Date value '%s': %s", dateStr, e.getMessage()));
    }
}

protected DateFormat getDateFormat(){    
   if (_dateFormat != null) {        
        return _dateFormat;
    }
    DateFormat df = _config.getDateFormat();
    _dateFormat = df = (DateFormat) df.clone();    
    return df;
}

public final DateFormat getDateFormat() { 
    return _base.getDateFormat(); 
}

#spring.jackson.date-format=yyyy-MM-dd HH:mm:ss
#spring.jackson.time-zone=Asia/Chongqing

import java.text.DateFormat;import java.text.FieldPosition;
import java.text.ParseException;import java.text.ParsePosition;
import java.text.SimpleDateFormat;import java.util.Date;
 
public class MyDateFormat extends DateFormat {	
    private DateFormat dateFormat;	
    private SimpleDateFormat format1 = new SimpleDateFormat("yyy-MM-dd HH:mm:ss");	
    public MyDateFormat(DateFormat dateFormat) {		
        this.dateFormat = dateFormat;
	}
	
    @Override
	public StringBuffer format(Date date, StringBuffer toAppendTo, FieldPosition fieldPosition) {		
        return dateFormat.format(date, toAppendTo, fieldPosition);
	}
	
    @Override
	public Date parse(String source, ParsePosition pos) {
 
		Date date = null;		
        try {
 
			date = format1.parse(source, pos);
		} catch (Exception e) {
 
			date = dateFormat.parse(source, pos);
		}		return date;
	}	// 主要還是裝飾這個方法
	
    @Override
	public Date parse(String source) throws ParseException {
 
		Date date = null;		
        try {			
			// 先按我的規(guī)則來
			date = format1.parse(source);
		} catch (Exception e) {			// 不行，那就按原先的規(guī)則吧
			date = dateFormat.parse(source);
		}		return date;
	}	// 這里裝飾clone方法的原因是因為clone方法在jackson中也有用到
	
    @Override
	public Object clone() {
		Object format = dateFormat.clone();		
        return new MyDateFormat((DateFormat) format);
	}
}

@Configuration
public class WebConfig {	
    @Autowired
	private Jackson2ObjectMapperBuilder jackson2ObjectMapperBuilder;	
	@Bean
	public MappingJackson2HttpMessageConverter MappingJsonpHttpMessageConverter() {
 
		ObjectMapper mapper = jackson2ObjectMapperBuilder.build();		// ObjectMapper為了保障線程安全性，里面的配置類都是一個不可變的對象
		// 所以這里的setDateFormat的內(nèi)部原理其實是創(chuàng)建了一個新的配置類
		DateFormat dateFormat = mapper.getDateFormat();
		mapper.setDateFormat(new MyDateFormat(dateFormat));
 
		MappingJackson2HttpMessageConverter mappingJsonpHttpMessageConverter = new MappingJackson2HttpMessageConverter(
				mapper);		
return mappingJsonpHttpMessageConverter;
	}
}

@Configurationclass JacksonHttpMessageConvertersConfiguration {	
@Configuration
@ConditionalOnClass(ObjectMapper.class)
@ConditionalOnBean(ObjectMapper.class)	
@ConditionalOnProperty(name = HttpMessageConvertersAutoConfiguration.PREFERRED_MAPPER_PROPERTY, havingValue = "jackson", matchIfMissing = true)	protected static class MappingJackson2HttpMessageConverterConfiguration {		@Bean
		@ConditionalOnMissingBean(value = MappingJackson2HttpMessageConverter.class, ignoredType = {				"org.springframework.hateoas.mvc.TypeConstrainedMappingJackson2HttpMessageConverter",				"org.springframework.data.rest.webmvc.alps.AlpsJsonHttpMessageConverter" })		public MappingJackson2HttpMessageConverter mappingJackson2HttpMessageConverter(
				ObjectMapper objectMapper) {			
    return new MappingJackson2HttpMessageConverter(objectMapper);
		} 
}