FormatterRegistry配置应用的格式转换功能

import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;
import org.springframework.format.FormatterRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;

@Configuration
public class CommonConfig implements WebMvcConfigurer {

	public void addFormatters(FormatterRegistry registry) {
		registry.addConverter(new Converter<String, String[]>() {
			@Override
			public String[] convert(String source) {
				String[] strings = null;
				if (source != null) {
					strings = new String[] { source };
				}
				return strings;
			}
		});

		registry.addConverter(new Converter<String[], String>() {
			@Override
			public String convert(String[] values) {
				String str = null;
				if (values != null) {
					str = values.length > 0 ? values[0] : null;
				}
				return str;
			}
		});
		
		registry.addConverter(new Converter<Object[], Object>() {
			@Override
			public Object convert(Object[] values) {
				Object str = null;
				if(isNum((String) (values)[0])) {
					str = ((Object[]) values)[0];
				}else {
					str = "0";
				}
				return str;
			}
		});
		
	}
	
	  private boolean isNum(String str) {
		    try {
		      Long.parseLong(str);
		    } catch (Exception e) {
		      return false;
		    }
		    return true;
		  }
}

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