qq_41373328的博客

package com.app.util;import java.io.IOException;import java.util.Map;import com.alibaba.fastjson.JSONObject;import lombok.extern.slf4j.Slf4j;import org.apache.http.HttpEntity;import org.apache.http.HttpStatus;import org.apache.http.client.config.Re

public static void main(String[] args) {//new一个list，给list添加三组值。List list = new ArrayList<>();VehicleInfo vehicleInfo = new VehicleInfo();vehicleInfo.setSysOrgId(100);vehicleInfo.setTerminalType(“2”);list.add(vehicleInfo);VehicleInfo vehicleInf

https://blog.youkuaiyun.com/flyfeifei66/article/details/81481222

public static void main(String[] args) { File file = new File("D:\\test.txt"); //写 String[] strs = {"咋杀手实打实大所22","sdasdasd11","炸死你搭嘎手打22"}; FileWriter fw = null; ...

package autoData;/** * 饿汉式（程序启动时实例化） * */public class Test { //构造函数私有化 private Test(){}; //私有的静态变量 private static Test test = new Test(); //公共的访问方法 public static Test getIn...

https://blog.youkuaiyun.com/Jenny_lm/article/details/82713583

public static <T> List<List<T>> splitList(List<T> list, int len) { if (list == null || list.size() == 0 || len < 1) { return null; } List<List<T>> res...

//将文件写入到本地并返回图片路径（路径用于存入数据库） public String[] uploadImage1(MultipartFile file,String barCode){ //时间戳 String currentTime =String.valueOf(new Date().getTime()); //原始图片路径 ...

//去指定路径下下载文件 public void download(HttpServletResponse response, String filePath){ File file = new File(filePath); // 取得文件名。 String fileName = file.getName(); InputS...

@RequestMapping(value = "/imageView1", method = {RequestMethod.GET})public void imageView1(HttpServletRequest request, HttpServletResponse httpServletResponse,String fileName){byte[] bytes = file...

在java中，首先我们理解基本数据类型和引用数据类型。所谓基本数据类型，就是数据的值直接存储在内存的栈空间，不存在“引用”的概念，有8种基本数据类型byte-&gt;short–char-&gt;int-&gt;long-&gt;float-&gt;double-&gt;boolean所谓引用数据类型，就是都继承java的根父类，object类，引用对象的首地址存储在内存中栈空间，而对象的值存...

我们知道，java语言是面向对象语言，万事万物都可以当做对象，封装属性与方法。但是八种基本数据类型不能当做对象，为了解决这个矛盾，于是就把八种类型分别进行包装，各自提供一些方法。byte–》Byteshort–》Shortchar–》Characterint–》Integerlong–》Longfloat–》Floatdouble–》Doubleboolean–》Boolean...

//普通java文件下载方法，适用于所有框架 public String downloadFilesTest(HttpServletRequest request,HttpServletResponse res) throws IOException { //获取文件根目录，不同框架获取的方式不一样，可自由切换 String basePath = r...

import java.io.FileInputStream;import java.io.FileNotFoundException;import java.io.FileOutputStream;import java.io.IOException;public class Test {public static void main(String[] args) {try {Fi...

BigDecimal bignum1 = new BigDecimal(“10”);BigDecimal bignum2 = new BigDecimal(“5”);BigDecimal bignum3 = null;//加法bignum3 = bignum1.add(bignum2);System.out.println(“和 是：” + bignum3);//减法bignum3...