求mapreduce（JAVA）读取文件然后处理数据的代码

package test;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;

public class Test {
public static void main(String[] args) {
Test t = new Test();
t.mapreduce("c:\\a.txt");
}
public void mapreduce(String filepath){
if(filepath==null||"".equals(filepath)){
System.out.println("文件名错误！");
return;
}
List list = new ArrayList();
File f = new File(filepath);
BufferedReader reader=null;
try {
reader = new BufferedReader(new FileReader(f));
String tempString = null;
// 一次读入一行，直到读入null为文件结束
while ((tempString = reader.readLine()) != null) {
list.add(tempString);
}
reader.close();
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
if (reader != null) {
try {
reader.close();
} catch (Exception e1) {
}
}
}
for(int i=0,length=list.size();i String name = list.get(i).split(":")[1];
String id = list.get(i+1).split(":")[1];
String address = list.get(i+2).split(":")[1];
System.out.println("name:"+name+",id:"+id+",address:"+address);
}
}
}