Java-使用处理流读文件内容

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将abc.txt写入如下内容,并保存编码为UTF-8

<!doctype html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<meta name="viewport"
		  content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
	<meta http-equiv="X-UA-Compatible" content="ie=edge">
	<title>随机点名</title>
	<style>
		html,body,div,p{
			margin:0;
			padding:0;
		}
		body{
			background:black;
		}
		.box{
			width:710px;
			height:600px;
			border: 1px solid white;
			margin:0 auto;
			position:relative;
		}
		.box>.stu_name{
			width:100px;
			height:40px;
			background:orangered;
			font-size:30px;
			line-height:40px;
			text-align:center;
			color:white;
			float:left;
			margin:20px;
			cursor:pointer;
		}
		.start_choose_name{
			width:200px;
			height:80px;
			font-size:50px;
			line-height:80px;
			text-align:center;
			position:absolute;
			bottom:20px;
			left:50%;
			margin-left:-100px;
			color:white;
			background:blueviolet;
			cursor:pointer;
		}
		.choose{
			background:white;
			color:blueviolet;
		}
	</style>
</head>
<body>
<div class='box'>
	<p class="start_choose_name">开始点名</p>
</div>
<script>
window.onload = function () {
	var stu = ["李国威","李卓锟","韦雄","孙燕春","张辉","范玉伟","严波","李凯晴",
				"崔明勇","李毅强","谭浩根","赵来荣","叶旭秋","吴荣荣",
				"陈炫林","幸文杰","黎家晖"],
	                        //配置学生姓名 注：若更改学生集合，请手动清除本地存储。。
				//清除方法浏览器控制台输入window.localStorage.setItem("stu",null）而后按下ENTER键
			ls_sty = JSON.parse(window.localStorage.getItem("stu")),
			stuArray = ls_sty&&ls_sty.length?ls_sty:stu,
			box = document.querySelector(".box"),
			btn = document.querySelector(".start_choose_name"),
			/**
			 * 随机的下标 params array
			 */
			selected = (array) => {
				return Math.floor(Math.random() * array.length)
			},
			/*随机的颜色封装函数*/
			color = () => {
				let r = Math.floor(Math.random() * 256),
						g = Math.floor(Math.random() * 256),
						b = Math.floor(Math.random() * 256);
				return 'rgb(' + r + ',' + g + ',' + b + ')'
			};
	for (let i = 0; i < stu.length; i++){
		let div = document.createElement("div");
		div.setAttribute("class","stu_name");
		div.innerText = stu[i];
		box.appendChild(div);
	}
	/**
		* 禁止选择
		*/
	document.onselectstart = () => {
		return false
	};
	var allowClick = true,
			colorTimes = 0,
			timer,
			stuNameArray = document.querySelectorAll(".box>.stu_name");
	btn.onclick = () => {
		if (allowClick) {
			allowClick = false;
			btn.innerText = "点名中";
			timer = setInterval( () => {
				colorTimes ++;
				stuNameArray.forEach((item,index) => {
					item.style.cssText = "background:"+ color() + ";color:" + color();
				});
				if (colorTimes >= 20) {
					clearInterval(timer);
					allowClick = true;
					colorTimes = 0;
					btn.innerText = "开始点名";
					stuNameArray.forEach((item,index) => {
						item.style.cssText = "background:orangered;color:white;" ;
					});
					let _index = selected(stuArray);
					stuNameArray.forEach((item,index) => {
						if(item.innerText == stuArray[_index]) {
							item.style.cssText = "background:white;color:blueviolet;";
						}
					});
					stuArray.splice(_index,1);
					console.info(stuArray);
					window.localStorage.setItem("stu",JSON.stringify(stuArray));
					if(!stuArray.length){
						stuArray = stu
					}
				}
			},100)
		}
	};
};
</script>
</body>
</html>

TestReadFile_manyContent

package 字符流的读写;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;

public class TestReadFile_manyContent {

	public static void main(String[] args) {
		File source = new File("E:\\abc.txt");
		
//		FileReader f;
//		
//		BufferedReader br;
		
		//jdk7的新写法，不用写finally语句块，可以自动释放资源
		try(
				BufferedReader br = new BufferedReader(new FileReader(source));
				){
			String content = null;
			
			while((content = br.readLine()) != null) {
				System.out.println(content);
			}
		}catch (Exception e) {
			e.printStackTrace();
		}
	}
}

运行结果如下：

Java-使用处理流读文件内容

142-Java-使用处理流读文件内容.mdopen in new window

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预览:

Java-使用处理流读文件内容

# 142-Java-使用处理流读文件内容.mdopen in new window

# 分割线

预览:

142-Java-使用处理流读文件内容.mdopen in new window

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