本文已参与「新人创作礼」活动，一起开启掘金创作之路。

package com.esint.gaplatform.sjxxdataxjclgs.util;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Obj2map {

    public static Map<String, Object> objectToMap(Object obj) throws IllegalAccessException {
        Map<String, Object> map = new HashMap<String, Object>();
        Class<?> clazz = obj.getClass();
        for (Field field : clazz.getDeclaredFields()) {
            field.setAccessible(true);
            String fieldName = field.getName();
            String field_name = humpToLine(fieldName);
            Object value = field.get(obj);
            map.put(field_name, value);
        }
        return map;
    }

    private static Pattern linePattern = Pattern.compile("_(\\w)");
    private static Pattern humpPattern = Pattern.compile("[A-Z]");

    /**
     * 驼峰转下划线,最后转为大写
     * @param str
     * @return
     */
    public static String humpToLine(String str) {
        Matcher matcher = humpPattern.matcher(str);
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            matcher.appendReplacement(sb, "_" + matcher.group(0).toUpperCase());
        }
        matcher.appendTail(sb);
        return sb.toString().toUpperCase();
    }

    /**
     * 下划线转驼峰,正常输出
     * @param str
     * @return
     */
    public static String lineToHump(String str) {
        Matcher matcher = linePattern.matcher(str);
        StringBuffer sb = new StringBuffer();
        while (matcher.find()) {
            matcher.appendReplacement(sb, matcher.group(1).toUpperCase());
        }
        matcher.appendTail(sb);
        return sb.toString();
    }


}

实例应用

package com.esint.gaplatform.sjxxdataxjclgs.controller;



import com.esint.gaplatform.sjxxdataxjclgs.entitymubiao.TEsintSjxxBpcclxxbEntity;
import com.esint.gaplatform.sjxxdataxjclgs.entitymubiao.TEsintSjxxHsryEntity;
import com.esint.gaplatform.sjxxdataxjclgs.service.IDataSendService;
import com.esint.gaplatform.sjxxdataxjclgs.service.impl.BaseUserHandle;
import com.esint.gaplatform.sjxxdataxjclgs.util.FileTxt;

import com.esint.gaplatform.sjxxdataxjclgs.util.Obj2map;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.text.SimpleDateFormat;
import java.util.*;


@Api(value = "个人记录查询-测试")
@RestController
@RequestMapping("/test")
public class TestController {

    @Autowired
    private IDataSendService iDataSendService;

    @Autowired
    private BaseUserHandle baseUserHandle;


    @ApiOperation(value = "测试连通性", httpMethod = "GET")
    @ResponseBody
    @RequestMapping(value = "/ping", method = RequestMethod.GET)
    public void testPing() {
        System.out.println("hello");
    }


    //检验对象转换map 的键值
    @ApiOperation(value = "checkMap", httpMethod = "GET")
    @ResponseBody
    @RequestMapping(value = "/checkMap", method = RequestMethod.GET)
    public void checkMap() throws IllegalAccessException {
        Obj2map obj2map = new Obj2map();
        TEsintSjxxHsryEntity tEsintSjxxHsryEntity = new TEsintSjxxHsryEntity();
        tEsintSjxxHsryEntity.setXm("sd");
        tEsintSjxxHsryEntity.setZjhm("324");
        Map<String, Object> fieldAnnotation = Obj2map.objectToMap(tEsintSjxxHsryEntity);


    }



    @ApiOperation(value = "test", httpMethod = "GET")
    @ResponseBody
    @RequestMapping(value = "/test", method = RequestMethod.GET)
    public void test() {


//        System.out.println(baseUserHandle.getTotal());
        FileTxt fileTxt = new FileTxt();
        Date date = new Date();

        fileTxt.FileW("随手记" + date.toString(), "/runlog/baseuser/1000.txt");

    }


    @ApiOperation(value = "test1", httpMethod = "GET")
    @ResponseBody
    @RequestMapping(value = "/test1", method = RequestMethod.GET)
    public void test1() {
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss.SSS");
        double d1 = 17;
        double d2 = 3;
        double result = d1 / d2;
        /**
         * 四舍五入
         */
        int roundNum = (int) Math.round(result);
        /**
         * 向上取整
         */
        int ceilNum = (int) Math.ceil(result);
        /**
         * 向下取整
         */
        int floorNum = (int) Math.floor(result);
        System.out.println("除法商值：" + result);
        System.out.println("四舍五入：" + roundNum);
        System.out.println("向上取整：" + ceilNum);
        System.out.println("向下取整：" + floorNum);


        List<Integer> list = new ArrayList<>();
        for(int i=1;i<11;i++){
            list.add(i);
        }





        while (list.size()>0){
            Integer a = list.get(0);
            System.out.println("*****");
            System.out.println("*");
            System.out.println(a);
            System.out.println("*");
            for(Integer q:list){
                System.out.print(Integer.toString(q)+"-");
            };
            System.out.println("*****");
            list.remove(0);
        }


        System.out.println("-----");


    }


}