Java FileNotFoundException 尽管文件存在。

Question

package com.test.methods;

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

import android.R;
import android.app.Activity;
import android.app.ListActivity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.ListView;

import com.crumbin.main.R.color;
import com.google.gson.JsonArray;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;
import com.google.gson.JsonParser;



public class JsonParserActivity extends Activity {


    String strLine = null;
    String[] values = null;
    @Override
        public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);
        setContentView(com.main.R.layout.user_main);





              // Open the file that is the first 
              // command line parameter




            try {
                FileInputStream fstream = new FileInputStream("/home/hic/jdata.txt");

              // Get the object of DataInputStream
              DataInputStream in = new DataInputStream(fstream);
              BufferedReader br = new BufferedReader(new InputStreamReader(in));

              //Read File Line By Line

                while ((br.readLine()) != null)   {
                  // Print the content on the console
                      strLine = strLine + br.readLine();

                }
              this.parse(strLine);
              //Close the input stream

                in.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

              parse(strLine);


              ListView contactLV = (ListView) findViewById(com.crumbin.main.R.id.user_contact_list); 

              ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,com.main.R.layout.user_contact_list_item,com.main.R.id.contact_name,values);
                contactLV.setAdapter(adapter);




        }

    public void parse(String jsonLine) {
        JsonElement jelement = new JsonParser().parse(jsonLine);
        JsonObject  jobject = jelement.getAsJsonObject();


        JsonArray jarray = jobject.getAsJsonArray("contact");

        jobject = jarray.get(0).getAsJsonObject();


        values[0]= jobject.get("user").toString();

    }


}

我尝试过 file.CanRead() 和 file.exist() ，但都返回 False。该文件存在。此外，该文件没有被任何其他进程读取。

Answer 1

如果canRead不起作用并且文件确实存在，则意味着存在权限问题。