Springmvc conver实现原理及用法解析

这种情况:

如果request参数是String类型,但是Controller的入参需要Date类型, 这种情况就需要Converter:

代码:

HiConverter:

请求路径:

http://localhost:8080/mvc/date?myDate=2020-11-22

@Controller

public class HiController {

@RequestMapping("/date")

@ResponseBody

public String getDate(Date myDate) {

return myDate.toString();

}

}

MyDateConverter:

public class MyDateConverter implements Converter<String, Date> {

  

@Override

public Date convert(String s) {

SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-DD");

Date date = null;

try {

date = sdf.parse(s);

} catch (ParseException e) {

e.printStackTrace();

}

return date;

}

}

springMVC.xml:

public class MyDateConverter implements Converter<String, Date> {

  

@Override

public Date convert(String s) {

SimpleDateFormat sdf = new SimpleDateFormat("YYYY-MM-DD");

Date date = null;

try {

date = sdf.parse(s);

} catch (ParseException e) {

e.printStackTrace();

}

return date;

}

}

结果:

注:

// S - source, T - to

@FunctionalInterface

public interface Converter<S, T> {

@Nullable

T convert(S var1);

}

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