Question

java如何读取txt文件

如何用JAVA写个程序读出TXT文件数据 并做计算和排序

Answer 1

程序已经发你邮箱了，请注意查收噢。
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public class Student {
String id;
String name;
int yuwen;
int shuxue;
int yingyu;
int avg;
int sum;
int sort;
public Student(String id,String name,int yuwen,int shuxue,int yingyu,int avg,int sum){
this.id=id;
this.name=name;
this.yuwen=yuwen;
this.shuxue=shuxue;
this.yingyu=yingyu;
this.avg=avg;
this.sum=sum;
}
public Student(String id,String name,int yuwen,int shuxue,int yingyu){
this.id=id;
this.name=name;
this.yuwen=yuwen;
this.shuxue=shuxue;
this.yingyu=yingyu;
}
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getYuwen() {
return yuwen;
}
public void setYuwen(int yuwen) {
this.yuwen = yuwen;
}
public int getShuxue() {
return shuxue;
}
public void setShuxue(int shuxue) {
this.shuxue = shuxue;
}
public int getYingyu() {
return yingyu;
}
public void setYingyu(int yingyu) {
this.yingyu = yingyu;
}
public int getAvg() {
return avg;
}
public void setAvg(int avg) {
this.avg = avg;
}
public int getSum() {
return sum;
}
public void setSum(int sum) {
this.sum = sum;
}
public int getSort() {
return sort;
}
public void setSort(int sort) {
this.sort = sort;
}

}
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public class IOGrage {
public void swap(int[] array,int i,int j){
int temp=array[i];
array[i]=array[j];
array[j]=temp;
}
public static void main(String[] args) {
BufferedReader br = null;
List list = new ArrayList();
try {
br = new BufferedReader(new InputStreamReader(new FileInputStream(
new File("C:/grade.txt"))));
String temp = br.readLine();
while (temp != null) {
temp = temp.replaceAll(" ", ",");
StringBuffer sbTemp = new StringBuffer("");
String[] each = temp.split(",");
for (int i = 0; i < each.length; i++) {
if (!each[i].equals("")) {
sbTemp.append(each[i] + ",");
}
}
each = sbTemp.toString().split(",");
if (!"学号".equals(each[0])) {
String id = each[0];
String name = each[1];
int yuwen = Integer.parseInt(each[2]);
int shuxue = Integer.parseInt(each[3]);
int yingyu = Integer.parseInt(each[4]);
int avg = (yuwen + shuxue + yingyu) / 4;
int sum = yuwen + shuxue + yingyu;
Student s = new Student(id, name, yuwen, shuxue, yingyu,
avg, sum);
list.add(s);
}

temp = br.readLine();
}
br.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
//System.out.println(list.size());
int[] array=new int[list.size()];
for(int i=0;i<list.size();i++){
Student s=(Student)list.get(i);
array[i]=s.getSum();
}
for(int i=0;i<array.length;i++){
for(int j=0;j<array.length-i-1;j++){
if(array[j]<array[j+1]){
int t=array[j];
array[j]=array[j+1];
array[j+1]=t;
}
}
}

Map map=new HashMap();
for(int i=0;i<array.length;i++){
map.put(array[i], i+1);
}

List lList=new ArrayList();
for(int i=0;i<list.size();i++){
Student s=(Student)list.get(i);
if(s.getName().length()==2){
s.setName(s.getName()+" ");
}else if(s.getName().length()==3){
s.setName(s.getName()+" ");
}
if(s.getId().length()==1){
s.setId(s.getId()+" ");
}else if(s.getId().length()==2){
s.setId(s.getId()+" ");
}

int sum=s.getSum();
int sort=((Integer)map.get(sum)).intValue();
s.setSort(sort);
lList.add(s);
}
StringBuffer sb=new StringBuffer("学号 姓名 语文 数学 英语 平均值 总值 排序");
for(int i=0;i<lList.size();i++){
Student s=(Student)lList.get(i);
sb.append("\n"+s.getId()+" "+s.getName()+" "+s.getYuwen()+" "+s.getShuxue()+" "+s.getYingyu()+" "+s.getAvg()+" "+s.getSum()+" "+s.getSort());
}

BufferedWriter bw=null;
try{
bw=new BufferedWriter(new OutputStreamWriter(new FileOutputStream("c:/grade.txt")));
bw.write(sb.toString());
bw.close();
}catch(Exception e ){
e.printStackTrace();
}

}
}