集合综合练习<四>

package com.JiHeTotal;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeMap;

public class TestStudent {

	public static void main(String[] args) {
		List<Student> list = new ArrayList<Student>();// 存储学生信息的学生容器
		Map<String, Map<String, Double>> map2 = new HashMap<String, Map<String, Double>>();// 人名和学科、分数的映射
		Map<String, Double> map3 = new TreeMap<String, Double>();// 总分和人名的映射(这个地方有点问题就是当总分相同时会发生数据丢失,处理方式是重新定义比较器)
		Scanner in = new Scanner(System.in);
		try {

			// 把学生信息加载到List中
			PushScodeToList(list);

			// 总分 // 个人成绩单
			totalScode(list, map2, map3);

			// 生成总分排名文件
			List<Map.Entry<String, Double>> list1 = ArrangTotalScode(map3);

			// 生成班级最高分和最低分的同学的成绩单文件
			High_Lower_Scode_File(list, list1);

			// 生成单科的排名文件(需要输入要生成哪一科)
			System.out.println("请输入你要生成排名文件的科目");
			String subjectName = in.next();
			Per_Subject_ScodeFile(list, subjectName);

			// 统计及格人数和不及格人数
			System.out.println("请输入你要统计及格人数的科目名:");
			String name = in.next();
			getPersonNumber(list, name);

		} catch (IOException e) {

			e.printStackTrace();
		}

	}

	/*
	 *
	 *
	 * 用来统计及格人数和不及格人数
	 *
	 */
	private static void getPersonNumber(List<Student> list, String name) throws IOException {
		Iterator<Student> it = list.iterator();// 创建学生对象的容器
		int i = 0;// 统计及格人数
		StringBuffer sb = null;
		BufferedWriter bw = null;
		try {
			sb = new StringBuffer();
			bw = new BufferedWriter(new FileWriter("e:\\getPersonNumber.txt", true));
			while (it.hasNext()) {
				Student student = (Student) it.next();

				Set<Map.Entry<String, Double>> setMap = student.scode.entrySet();
				Iterator<Map.Entry<String, Double>> it1 = setMap.iterator();

				while (it1.hasNext()) {
					Map.Entry<String, Double> entry = (Map.Entry<String, Double>) it1.next();
					if (entry.getKey().contains(name) && entry.getValue() >= 60) {
						i++;
					}

				}
			}
			System.out.println(name + "及格人数:" + "\t" + (i) + "\t" + "不及格人数:" + (list.size() - i));
			sb.append(name + "及格人数:" + "\t" + (i) + "\t" + "不及格人数:" + (list.size() - i));
			bw.write(sb.toString());
			bw.newLine();
			bw.flush();
		} finally {
			if (bw != null) {
				bw.close();
			}
		}

	}

	/*
	 *
	 *
	 * 生成单科的排名文件(需要输入要生成哪一科)
	 *
	 *
	 */
	private static void Per_Subject_ScodeFile(List<Student> list, String subjectName) throws IOException {

		Map<String, Double> map = new TreeMap<String, Double>();//
		StringBuffer sb = null;
		BufferedWriter bw = null;
		Iterator<Student> it = list.iterator();// 创建list的迭代器

		try {
			bw = new BufferedWriter(new FileWriter("e:\\Per_Subject_ScodeFile.txt", true));
			while (it.hasNext()) {
				Student student = (Student) it.next();

				if (student.scode.containsKey(subjectName)) {// 按指定科目进行判断，然后把满足要求的学生姓名和对应的分数加入map中
					map.put(student.name, student.scode.get(subjectName));// 把学生名字添加到map中
				}
			}

			List<Map.Entry<String, Double>> list1 = new ArrayList<Map.Entry<String, Double>>(map.entrySet());// 把map转化为List
			Collections.sort(list1, new MyComparator());// 利用自定义比较器进行排序
			bw.write(subjectName);// 把学科名写入文件
			bw.newLine();// 换行
			for (Entry<String, Double> entry : list1) {
				System.out.println("名字:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
				sb = new StringBuffer();
				sb.append("名字:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
				bw.write(sb.toString());
				bw.newLine();
				bw.flush();// 刷新缓冲区
			}

		} finally {
			if (bw != null) {
				bw.close();
			}
		}
	}

	/*
	 *
	 *
	 * 生成班级最高分和最低分的同学的成绩单文件
	 *
	 *
	 */
	private static void High_Lower_Scode_File(List<Student> list, List<Entry<String, Double>> list1)
			throws IOException {

		// 获得最高分数人的姓名
		String name = list1.get(0).getKey();
		System.out.println(name);
		// 获得最低分数人的姓名
		String name1 = list1.get(list.size() - 1).getKey();
		System.out.println(name1);
		StringBuffer sb = null;
		BufferedWriter bw = null;
		try {
			bw = new BufferedWriter(new FileWriter("e:\\High_Lower_Scode_File.txt"));
			for (Student stu : list) {// 遍历存储学生对象的容器

				// 获得最高分的成绩单
				if (stu.name.equals(name)) {// 根据学生姓名找到学生对象存储学科和成绩的map
					bw.write(name);// 把学生姓名写入文件
					bw.newLine();// 换行
					Set<Map.Entry<String, Double>> set = stu.scode.entrySet();// 返回对应map集合Entry节点
					Iterator<Map.Entry<String, Double>> it = set.iterator();// 创建迭代器
					while (it.hasNext()) {
						sb = new StringBuffer();
						Map.Entry<String, Double> entry = (Map.Entry<String, Double>) it.next();// 遍历每一个Entry节点
						System.out.println("名字:" + name + "学科:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
						sb.append("学科:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
						bw.write(sb.toString());
						bw.newLine();
					}

					// 获得最低分的成绩单
				} else if (stu.name.equals(name1)) {
					bw.write(name1);
					bw.newLine();
					Set<Map.Entry<String, Double>> set = stu.scode.entrySet();
					Iterator<Map.Entry<String, Double>> it = set.iterator();
					while (it.hasNext()) {
						sb = new StringBuffer();
						Map.Entry<String, Double> entry = (Map.Entry<String, Double>) it.next();
						System.out.println("名字:" + name1 + "学科:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
						sb.append("学科:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
						bw.write(sb.toString());
						bw.newLine();
					}

				}
				bw.flush();
			}
		} finally {
			if (bw != null) {
				bw.close();
			}
		}

	}

	/*
	 *
	 * 按TreeMap的值进行总分排序
	 *
	 *
	 */
	private static List<Map.Entry<String, Double>> ArrangTotalScode(Map<String, Double> map3) throws IOException {
		List<Map.Entry<String, Double>> list = new ArrayList<Map.Entry<String, Double>>(map3.entrySet());// 把map转化为List

		Collections.sort(list, new MyComparator());// 利用自定义比较器进行排序

		StringBuffer sb = null;
		BufferedWriter bw = null;
		try {
			bw = new BufferedWriter(new FileWriter("e:\\ArrangTotalScode.txt", true));
			for (Entry<String, Double> entry : list) {// 遍历排序完成的list
				sb = new StringBuffer();
				System.out.println("姓名:" + entry.getKey() + "分数:" + map3.get(entry.getKey()));
				sb.append("姓名:" + entry.getKey() + "\t" + "分数:" + map3.get(entry.getKey()));
				bw.write(sb.toString());
				bw.newLine();// 换行
				bw.flush();// 刷新缓冲区
			}
		} finally {
			if (bw != null) {
				bw.close();
			}
		}
		return list;// 返回有序的list
	}
	/*
	 *
	 * // 总分 // 个人成绩单
	 *
	 * *
	 */

	private static void totalScode(List<Student> list, Map<String, Map<String, Double>> map2, Map<String, Double> map3)
			throws IOException {

		Iterator<Student> it = list.iterator();// 创建学生对象容器list的容器
		BufferedWriter bw = null;
		StringBuffer sb = null;

		while (it.hasNext()) {// 外层循环遍历人数
			// System.out.println();
			Student student2 = (Student) it.next();
			System.out.println("id:" + student2.getId());
			System.out.println("name" + student2.getName());
			map2.put(student2.name, student2.scode);// 往map2中加入人名学科分数的映射

		}
		System.out.println(map2.size() + "map2");
		Set<String> setMap = map2.keySet();// map2的Key代表人名
		Iterator<String> it2 = setMap.iterator();// 创建map2的迭代器(map2中存放的是学生姓名和橙装学生科目成绩的映射)
		Double sum = 0.0;
		while (it2.hasNext()) {
			bw = new BufferedWriter(new FileWriter("e:\\PersonScodeMenu.txt", true));
			String student = (String) it2.next();// 遍历人(map2的key值部分,也就是人名)
			System.out.println(student);// 打印的是人名（测试语句）
			Set<Map.Entry<String, Double>> setMap2 = map2.get(student).entrySet();// 第二个小Map
			Iterator<Map.Entry<String, Double>> it3 = setMap2.iterator();// 迭代学科和成绩
			bw.write(student);// 把人名写入文件中
			while (it3.hasNext()) {

				Map.Entry<String, Double> entry = (Map.Entry<String, Double>) it3.next();
				sum = sum + entry.getValue();
				System.out.println("科目:" + entry.getKey() + "\t" + "分数：" + entry.getValue());
				sb = new StringBuffer();
				sb.append("\r\n" + "科目:" + entry.getKey() + "\t" + "分数:" + entry.getValue());
				bw.write(sb.toString());
				bw.newLine();

			}
			System.out.println(sum);
			map3.put(student, sum);// 把分数和人名的映射添加到Map3中
			bw.write(student + "总分:" + String.valueOf(sum) + "\r\n");
			bw.flush();
			sum = 0.0;
		}

	}

	/*
	 *
	 *
	 * 把学生信息加载到List中
	 *
	 *
	 */
	private static void PushScodeToList(List<Student> list) throws IOException {
		BufferedReader br = null;

		try {
			br = new BufferedReader(new FileReader("e:\\StudeentExamInfo.txt"));// 读取文件

			String left = "";//临时存储学生学号的字符串变量
			String str = null;// 临时存储按行读取的数据
			Student student = null;
			Map<String, Double> scode;
			while ((str = br.readLine()) != null) {
				scode = new HashMap<String, Double>();// 用于存储学科和其对应成绩的容器
				// 把读取的信息用split()方法进行分割,得到一个长度为4的字符串数组
				String[] str1 = str.split(",");
				if (str1.length <= 1) {// 避免行之间的空格导致空指针异常(空行读取的数组长度为1)
					continue;
				}
				//当学号不相等时，我们创建一个学生对象，然后把对应的成绩信息添加到该对象的Map容器中
				if (!str1[0].equals(left)) {
					scode.put(str1[2], Double.parseDouble(str1[3]));
					student = new Student(Integer.parseInt(str1[0]), str1[1], scode);
					list.add(student);
					left = str1[0];
				} else {
					student.scode.put(str1[2], Double.parseDouble(str1[3]));
				}
				System.out.println(scode.size());
			}
		} finally {
			if (br != null) {
				br.close();
			}
		}

	}
}