转换资源对象（对于文本）

最新推荐文章于 2024-08-17 02:06:33 发布
转载最新推荐文章于 2024-08-17 02:06:33 发布 · 676 阅读
文章标签：
#string #null #byte #url #file #exception
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本文介绍了一种实现文本对象之间转换的方法，包括本地文本、assets资源、raw资源及网络文本的读取与转换。提供了针对不同来源文本的实用代码示例，旨在帮助开发者在Android应用中灵活处理各类文本数据。
/无论是本地的文本，还是assets或raw中的文本，还是网络的文本。。。是不能直接用的。。。因此归纳了一下，贴出该码，实现各种文本对象的转换-----希望对大家有用
///<-------------工程里的resource-------------------->
package com.zhongxicai.ReadLocalFile;
import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import android.content.Context;
public class ReadSourceText {

private Context context;
public ReadSourceText(){
  super();
}

public ReadSourceText(Context context){
  this.context=context;
}
/**
  * 读取String对象，返回InputStream
  * */
public InputStream readStringToInputStream(String string){
  InputStream inputstream=null;
  byte   b[]= string.getBytes(); 
     inputstream=new  ByteArrayInputStream(b);
  return inputstream;
}
/**
  * 读取raw中的文本文件，返回InputStream
  */
public InputStream readRawToInputStream(int Id)
{
  InputStream inputstream=null;
  inputstream=context.getResources().openRawResource(Id);
  return inputstream;
}

/**
  * 读取assets中的文本文件，返回InputStream
  */
public  InputStream readAssetsToInputStream(String name){
  
  InputStream inputstream = null;//输入流
  try {
   inputstream= context.getAssets().open(name);
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  }//注意编码格式
  return inputstream;
}
/**
  * 读取assets中的文本文件，返回String
  * */
public  String readAssestToString(String name){
  
  InputStream in = null;//输入流
  BufferedReader reader = null;//缓存
  StringBuilder sb = new StringBuilder();//用于存放读取的数据
  try{
   in = readAssetsToInputStream(name);
   reader = new BufferedReader(new InputStreamReader(in));//将读取到的数据保存在缓存中
   String line = null;
   while((line = reader.readLine())!=null){//如果读取没结束
    sb.append(line);//在保持的数据结尾追加新读取的一行数据
   }
  }catch(Exception e){
   e.printStackTrace();
  }finally{
   try {
    in.close();
   } catch (IOException e1) {
    e1.printStackTrace();
   }
   try {
    reader.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
  return sb.toString();
}


}
///////<--------------本地文件------------------》
package com.zhongxicai.ReadLocalFile;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
public class ReadLocalText {
/**
  * 读取本地文本，返回InputStream
  */
public InputStream readFileToInputstream(String filepath)
{
  InputStream inputStream = null;
  try
  {   
   File file=new File(filepath);
   inputStream = new FileInputStream(file);
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }
  return inputStream;
}
/**
  * 读取本地文本，返回String
  * */
  public  String readFileToString(String filepath){
    StringBuffer buffer=new StringBuffer();
    try{
     FileInputStream fis=new FileInputStream(filepath);
     //或者InputStream fis=new readFileToInputstream(filepath)
        InputStreamReader isr=new InputStreamReader(fis,"UTF-8");
        Reader reader=new BufferedReader(isr);
        int ch;
        while((ch=reader.read())>-1){
         buffer.append((char)ch);
        }
        reader.close();
    }
    catch(IOException e){
     e.printStackTrace();
    }
    
    return buffer.toString();
   }
}
/////《--------------网络------------------》
package com.zhongxicai.UrlDownLoad;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.BasicResponseHandler;
import org.apache.http.impl.client.DefaultHttpClient;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaPlayer;
import android.os.AsyncTask;
import android.util.Log;

public class BookHttpDownload {

/**
     * 由url-----》获得InputStream----可行
     * */
    public InputStream getInputStream(String xmlUrlPath)
{

  URL infoUrl = null;
  InputStream inStream = null;
  try
  {
   infoUrl = new URL(xmlUrlPath);
   URLConnection connection = infoUrl.openConnection();
   HttpURLConnection httpConnection = (HttpURLConnection) connection;
   int responseCode = httpConnection.getResponseCode();
   if (responseCode == HttpURLConnection.HTTP_OK)
   {
    inStream = httpConnection.getInputStream();
   }
  }
  catch (MalformedURLException e)
  {
   e.printStackTrace();
  }
  catch (IOException e)
  {
   e.printStackTrace();
  }
  return inStream;
}
    /**
     * 由inputstream-----获得 byte[]
     * */
public byte[] getBytesFromStream(InputStream inputStream) {
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  byte[] b = new byte[1024];
  int len = 0;
  while (len != -1) {
   try {
    len = inputStream.read(b);
   } catch (IOException e) {
    e.printStackTrace();
   }
   if (len != -1) {
    baos.write(b, 0, len);
   }
  }
  if (inputStream != null) {
   try {
    inputStream.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
  return baos.toByteArray();
}
    /**
     * 由url----》获得byte[]
     * */
    public byte[] getBytesFromUrl(String urlstr) {
  BookHttpDownload httpload=new BookHttpDownload();
  ByteArrayOutputStream baos = new ByteArrayOutputStream();
  byte[] b = new byte[1024];
  InputStream inputStream = null;
  int len = 0;
  while (len != -1) {
   inputStream=httpload.getInputStream(urlstr);
    try {
     len = inputStream.read(b);
    } catch (IOException e) {
     e.printStackTrace();
    }
   if (len != -1) {
    baos.write(b, 0, len);
   }
  }
  if (inputStream != null) {
   try {
    inputStream.close();
   } catch (IOException e) {
    e.printStackTrace();
   }
  }
  return baos.toByteArray();
}
    /**
     * 获取URL输入流，转为String----可行
     * */
    public String getUrlString(String urlstr){
       StringBuilder sb=new StringBuilder(512);
     URL url = null;
     try {
      url = new URL(urlstr);
     } catch (MalformedURLException e) {
      e.printStackTrace();
     }
     InputStreamReader urlStream = null;
     try {
      urlStream = new InputStreamReader(url.openStream());
     } catch (IOException e1) {
      e1.printStackTrace();
     }
     BufferedReader in=new BufferedReader(urlStream);
     String str;
     try {
      while((str=in.readLine())!=null){
          sb.append(str);
      }
      in.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
     try {
      urlStream.close();
     } catch (IOException e) {
      e.printStackTrace();
     }
     return sb.toString(); 
    }
   }
转载于：http://www.eoeandroid.com/thread-164769-1-1.html