android cache 사용하기

android cache 사용하기
---------------------------------------------------



import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;

import android.content.Context;
public class CacheStorage {
private static String _cacheFileName = "cache";
private static Context Ctx;

public CacheStorage(Context ctx, String cacheFileName){
if(cacheFileName != null && cacheFileName.length() > 0)
_cacheFileName = cacheFileName;
}

public void setCacheFile(String data) throws IOException{
setCacheFile( _cacheFileName, data);
}

public void setCacheFile(String cacheFileName, String data) throws IOException{

if(cacheFileName == null || cacheFileName.length() < 1) cacheFileName = _cacheFileName;

try {
File cacheDir = Ctx.getCacheDir();
        File cacheFile = new File(cacheDir.getAbsolutePath(), cacheFileName);
        FileOutputStream fos;

fos = new FileOutputStream(cacheFile.getAbsolutePath());
fos.write(data.getBytes());
   fos.close();
     
} catch (FileNotFoundException e) {
e.printStackTrace();
}
             
}

public String getCacheFile(){
return getCacheFile(_cacheFileName);
}


public String getCacheFile(String cacheFileName){
File cacheDir = Ctx.getCacheDir();
        File cacheFile = new File(cacheDir.getAbsolutePath(), cacheFileName);
       
        if(!cacheFile.exists()) return "";
       
        BufferedReader br;

        StringBuilder sb = new StringBuilder(128);

        try {
        FileInputStream fis = new FileInputStream(cacheFile);        
        br = new BufferedReader(new InputStreamReader(fis, "UTF-8"));

            String line;

            while ((line = br.readLine()) != null) {
            sb.append(line);
            }

            br.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
       
        return sb.toString();
}

public boolean exists(){
File cacheDir = Ctx.getCacheDir();
        File cacheFile = new File(cacheDir.getAbsolutePath(), _cacheFileName);
       
        return cacheFile.exists();
}

public boolean deleteCacheFile(String cacheFileName){
File cacheDir = Ctx.getCacheDir();
        File cacheFile = new File(cacheDir.getAbsolutePath(), cacheFileName);
       
        if(!cacheFile.exists()) return false;
       
        return cacheFile.delete();
}
}