计算信息检索评价指标PR的源程序.doc

package fileAndStringOperate;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStream;

public class ReadFileToString {
public static void main(String []args) throws IOException{
String fileData = readtxt("D:\\IR\\1\\JAVA网络爬虫.txt");
CountRelatedDocument(fileData);
//MyWebRec []myWebRec = new MyWebRec[2000];

ClassifyURL(fileData);
}
private static String readtxt(String filePath) throws IOException{
BufferedReader br=new BufferedReader(new FileReader(filePath));
String str="";
String r=br.readLine();
while(r!=null){
str+=r+"\n";
r=br.readLine();
}
return str;
}
private static char[][] readtxtToChar(String filePath) throws IOException{
char [][]data = null;
int currentline = 0;
BufferedReader br=new BufferedReader(new FileReader(filePath));
String str="";
String r=br.readLine();
while(r!=null){
str+=r+"\n";
data[currentline++] = str.toCharArray();
r=br.readLine();
}
return data;
}
private static int CountRelatedDocument(String fileData){
int cntRelated = 0;
int currentLine = 1;
int baiduCnt = 0;
int bingCnt = 0;
int sogouCnt = 0;
int _360Cnt = 0;
int State = 0;
boolean baiduY[] = new boolean[51];
boolean bingY[] = new boolean[51];
boolean sogouY[] = new boolean[51];
boolean _360Y[] = new boolean[51];
char []fileChar = fileData.toCharArray();
for(int i = 0; i < fileChar.length;i ++)
{
if(fileChar[i] == '#' && fileChar[i+1] == '*')
{
State++;
System.out.println("分点："+currentLine);
}
if(fileChar[i] == '\n')
currentLine ++;
if(currentLine %3 == 0)
{
if(fileChar[i] == 'Y'||fileChar[i] == 'y')
{
if(State == 1){
baiduCnt ++;
baiduY[currentLine/3] = true;

}
else if(State == 2){
bingCnt ++;
bingY[currentLine/3 - 50 ] = true;
//System.out.println(currentLine/3 - 50);
}
else if(State == 3){
sogouCnt ++;
sogouY[currentLine/3 - 100] =true;
}
else if(State == 4){
_360Cnt ++;
_360Y[currentLine/3 - 150] = true;
}
cntRelated++;
}
}
}
try{

CaculatePR(baiduY,bingY,_360Y,sogouY,cntRelated);

}catch(Exception e){
e.getMessage();
}
System.out.println("cntRelated = "+cntRelated);
System.out.println("baiduCnt = "+baiduCnt);
System.out.println("bingCnt = "+bingCnt);
System.out.println("sohuCnt = "+sogouCnt);
System.out.println("_360Cnt = "+_360Cnt);
System.out.println("currentLine = " + currentLine);
return cntRelated;
}
private static void ClassifyURL(String fileData){
String str1[] = fileData.split("\n");
for(int i = 0;i < str1.length;i ++)
{
if(str1[i].startsWith("#*"))
str1[i] = str1[i].substring(10);
}
}
private static void CaculatePR(boolean baiduY[],boolean bingY[],boolean _360Y[],boolean sogouY[],int cntRelated) throws IOException{
double baiduP[] = new double [51];double baiduR[] = new double [51];
double bingP[] = new double [51];double bingR[] = new double [51];
double sogouP[] = new double [51];double sogouR[] = new double [51];
double _360P[] = new double [51];double _360R[] = new double [51];
int cntBaidu = 0;int cntBing = 0;int cntSogou = 0;int cnt360 = 0;
//System.out.println("Related:"+cntRelated);
for(int i = 1;i <= 50;i ++)
{
if(baiduY[i] == true)
cntBaidu ++;
if(bingY[i] == true)
cntBing ++;
if(sogouY[i] == true)
cntSogou ++;
if(_360Y[i] == true)
cnt360 ++;
baiduP[i] = 1.000000*cntBaidu/i;
baiduR[i] = 1.000000*cntBaidu/cntRelated;
bingP[i] = 1.000000*cntBing/i;
bingR[i] = 1.000000*cntBing/cntRelated;
sogouP[i] = 1.000000*cntSogou/i;
sogouR[i] = 1.000000*cntSogou/cntRelated;
_360P[i] = 1.000000*cnt360/i;
_360R[i] = 1.000000*cnt360/cntRelated;
//System.out.print(cntBaidu+"\t"+cntBing+"\t"+cntSogou+"\t"+cnt360+"\n");
}
CaculateMAP(baiduP,bingP,sogouP, _360P);
File file = new File("D:/JAVA网络爬虫.txt");
FileWriter out = new FileWriter(file); //文件写入流

//将数组中的数据写入到文件中。每行各数据之间TAB间隔
for(int i=1;i<=50;i++){
out.write("baidu"+"\t"+baiduP[i]+"\t" + baiduR[i]+"\r\n");
}
for(int i=1;i<=50;i++){
out.write("bing"+"\t"+bingP[i]+"\t" + bingR[i]+"\r\n");
}
for(int i=1;i<=50;i++){
out.write("sogou"+"\t"+sogouP[i]+"\t" + sogouR[i]+"\r\n");
}
for(int i=1;i<=50;i++){
out.write("360"+"\t"+_360P[i]+"\t" + _360R[i]+"\r\n");
}
out.close();
}
private static void CaculateMAP(double baiduP[],double bingP[],double sogouP[],double _360P[]){
double baiduPre=0,bingPre=0,sogouPre=0,_360Pre=0;
for(int i = 1;i <= 50;i ++ ){
baiduPre += baiduP[i];
bingPre += bingP[i];
sogouPre += sogouP[i];
_360Pre += _360P[i];
}
baiduPre /= 50;
bingPre /= 50;
sogouPre /= 50;
_360Pre /= 50;
System.out.println("baidu:"+baiduPre+"bing:"+bingPre+"sogou:"+sogouPre+"360:"+_360Pre);
}
}