首页  

http request to javabean     所属分类 java 浏览量 102
http request to javabean

public class User {  
    private String name;  
    private int age=-1;  
    private Date birth; 
    private Double weight;
    private Double height;
    

org.apache.commons.beanutils.BeanUtils


request ==> Map<String,String> ==> User


	static {
		DateConverter convert = new DateConverter();
		String[] patterns = { "yyyyMMdd", "yyyy-MM-dd" };
		convert.setPatterns(patterns);
		ConvertUtils.register(convert, Date.class);
	}

	public static <T> T toBean(Map<String, String> map, Class<T> beanClass) throws Exception{
		if(map==null || beanClass==null) {
			return null;			
		}
		T bean = beanClass.newInstance();
		BeanUtils.copyProperties(bean, map);
		return bean;
	}
	
	


完整代码
https://gitee.com/dyyx/hellocode/blob/master/demo/mydemo/src/main/java/dyyx/Map2BeanUtil.java


import java.util.Date;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.beanutils.converters.DateConverter;

import com.alibaba.fastjson.JSON;

public class Map2BeanUtil {

	static {
		DateConverter convert = new DateConverter();
		String[] patterns = { "yyyyMMdd", "yyyy-MM-dd" };
		convert.setPatterns(patterns);
		ConvertUtils.register(convert, Date.class);
	}

	public static <T> T toBean(Map<String, String> map, Class<T> beanClass) throws Exception{
		if(map==null || beanClass==null) {
			return null;			
		}
		T bean = beanClass.newInstance();
		BeanUtils.copyProperties(bean, map);
		return bean;
	}
	
	public static void main(String[] args) throws Exception{	
		
		Map<String,String> map = new HashMap<>();
		map.put("name", "tiger");
		map.put("age", "7");
		map.put("birth", "20210309");
		map.put("height", "120.1");
		map.put("weight", "10.9");

        User user = toBean(map,User.class);    
        System.out.println(JSON.toJSONString(user));
        
        // age=0
		map.put("age", "7.1");
		user = toBean(map,User.class);    
        System.out.println(JSON.toJSONString(user));
        // age=0
        map.put("age", "a");
		user = toBean(map,User.class);    
        System.out.println(JSON.toJSONString(user));
        
        map.remove("age");
        // age=-1 初始值
        user = toBean(map,User.class);    
        System.out.println(JSON.toJSONString(user));
        
        map.put("height", "a");
        // height = 0.0
		user = toBean(map,User.class);    
        System.out.println(JSON.toJSONString(user));
        
        map.put("birth", "2021 03 09");
        //  org.apache.commons.beanutils.ConversionException: Error converting 'String' to 'Date' using  patterns 'yyyyMMdd, yyyy-MM-dd'
		user = toBean(map,User.class);    
        System.out.println(JSON.toJSONString(user));	
	}
}


上一篇     下一篇
springboot禁用特定的自动配置类

go defer 延迟函数

java NIO http server

数据对象转换Object mapping

mysql时间函数

GO flag 命令行参数解析