通过文件的横纵转换对java的相关基础知识进行巩固
应用到的知识点有:
1.流(在此过程中主要用到的BufferedReader和BufferedWriter)
2.集合
重点突破:
对于这个问题重点就是一些思想的转化
1.如何拿到student.txt文件中的第一行
2.在第一行拿到之后,如何和后面的数据对应起来
需求:将下面的格式进行转换
student.txt
转换后的格式:
student1.txt
具体代码如下所示:
package com.gcy;
import java.io.Serializable;
public class Person implements Serializable,Comparable<Person>{
private String stuNo;
private String name;
private String gender;
private String age;
private String height;
private String weight;
private String tel;
public Person() {
super();
}
public Person(String stuNo, String name, String gender, String age, String height, String weight, String tel) {
super();
this.stuNo = stuNo;
this.name = name;
this.gender = gender;
this.age = age;
this.height = height;
this.weight = weight;
this.tel = tel;
}
public String getStuNo() {
return stuNo;
}
public void setStuNo(String stuNo) {
this.stuNo = stuNo;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getGender() {
return gender;
}
public void setGender(String gender) {
this.gender = gender;
}
public String getAge() {
return age;
}
public void setAge(String age) {
this.age = age;
}
public String getHeight() {
return height;
}
public void setHeight(String height) {
this.height = height;
}
public String getWeight() {
return weight;
}
public void setWeight(String weight) {
this.weight = weight;
}
public String getTel() {
return tel;
}
public void setTel(String tel) {
this.tel = tel;
}
@Override
public String toString() {
return "Person [stuNo=" + stuNo + ", name=" + name + ", gender=" + gender + ", age=" + age + ", height="
+ height + ", weight=" + weight + ", tel=" + tel + "]
";
}
/**
* 根据学好进行排序
* @param o
* @return
*/
@Override
public int compareTo(Person o) {
return this.stuNo.compareTo(o.stuNo);
}
}
==========================================================
package com.gcy;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
public class Test {
public static void main(String[] args) throws Exception {
convertor();
System.out.println("转换成功了");
}
public static void convertor() throws Exception {
// 创建一个高效的字符缓冲流,进行的读取
BufferedReader br = new BufferedReader(new FileReader("student.txt"));
String line = null;
// 创建一个集合,对person进行保存
List<Person> pList = new ArrayList<Person>();
// 判断是否是第一行的标志
boolean isFirst = true;
while ((line = br.readLine()) != null) {
// 获取第一行数据,思想:设置标志,通过标志进行判断
if (isFirst) {
// 对字符串进行一个分割,会生成一个字符串数组
String[] stuNos = line.split(" ");
// 学好 27s1 36 151s1 26s2 13s3
// 对第一行数据进行遍历,注意在遍历时应该从数组的第二个开始,第一个为头部信息
for (int i = 1; i < stuNos.length; i++) {
// System.out.println(stuNos[i].toString());
// 创建Person对象
Person p = new Person();
p.setStuNo(stuNos[i]);
pList.add(p);
}
// System.out.println(pList);
isFirst = false;
} else {
// 对剩余的所有行进行一个处理
// * 思想:利用第一行的处理,对集合进行一个遍历
String[] stuInfos = line.split(" ");
for (int i = 0; i < pList.size(); i++) {
// 获取每一个创建好的人
Person person = pList.get(i);
if (stuInfos[0].equals("姓名")) {
person.setName(stuInfos[i + 1]);
}
if (stuInfos[0].equals("性别")) {
person.setGender(stuInfos[i + 1]);
}
if (stuInfos[0].equals("年龄")) {
person.setAge(stuInfos[i + 1]);
}
if (stuInfos[0].equals("身高")) {
person.setHeight(stuInfos[i + 1]);
}
if (stuInfos[0].equals("体重")) {
person.setWeight(stuInfos[i + 1]);
}
if (stuInfos[0].equals("电话")) {
person.setTel(stuInfos[i + 1]);
}
}
}
}
Collections.sort(pList);
BufferedWriter bw=new BufferedWriter(new FileWriter("student1.txt"));
bw.write("学号 姓名 性别 年龄 身高 体重 电话");
//当写完一行是一定要记得换行
bw.newLine();
//进行一个循环
for(Person p:pList) {
bw.write(p.getStuNo()+" "+p.getName()+" "+p.getGender()+" "+p.getAge()+" "+p.getHeight()+" "+p.getWeight()+" "+p.getTel());
bw.newLine();
}
bw.flush();
}
}