Android中读取中文字符的文件与文件读取相关

一、如何显示assets/license.txt（中文）的内容？

(1)方法1：InputStream.available()得到字节数，然后一次读取完。

private String readUserAgreementFromAsset(String assetName) {

String content ="";

try {

InputStream is= getAssets().open(assetName);

if (is != null){

DataInputStream dIs = newDataInputStream(is);

intlength = dIs.available();

byte[] buffer = new byte[length];

dIs.read(buffer);

content= EncodingUtils.getString(buffer, "UTF-8");

is.close();

}

} catch (IOException e) {

e.printStackTrace();

}

return content;

}

(2)方法2：用BufferedReader.readLine()行读取再加换行符，最后用StringBuilder.append()连接成字符串。

A.以下是先行读取再转码UTF8：

private String readUserAgreementFromAsset(String assetName) {

StringBuilder sb = newStringBuilder("");

String content ="";

try {

InputStream is= getAssets().open(assetName);

if (is != null){

BufferedReader d = newBufferedReader(new InputStreamReader(is));

while (d.ready()) {

sb.append(d.readLine() +"\n");

}

content =EncodingUtils.getString(sb.toString().getBytes(), "UTF-8");

is.close();

}

} catch (IOException e) {

e.printStackTrace();

}

return content;

}

B.以下是InputStreamReader先指定以UTF8读取文件，再进行读取读取操作：

private String readUserAgreementFromAsset(String assetName) {

StringBuilder sb = newStringBuilder("");

String content ="";

try {

InputStream is= getAssets().open(assetName);

if (is != null){

BufferedReaderd = new BufferedReader(new InputStreamReader(is, "UTF-8"));

while(d.ready()) {

sb.append(d.readLine() +"\n");

}

content= sb.toString();

is.close();

}

} catch (IOException e) {

e.printStackTrace();

}

return content;

}

另外，UTF8转码也可以用new String(buffer, “utf-8”)。

(3)替代方法3：将license.txt内容作为string.xml的string，如：

<stringname="license_content">用户协议

\n \n一、服务条款的确认和接纳

\n…

</string>

需要注意的是：string里需要加\n作为换行符，原来txt里的换行符在取得string后无效。

不可取方法4：每次读取4096字节，以UTF8转码，最后连接字符串。因为汉字可能被截断，导致4096的倍数附近的中文可能出现乱码。

private String readUserAgreementFromAsset(String assetName) {

StringBuilder sb = newStringBuilder("");

String content ="";

try {

InputStream is= getAssets().open(assetName);

if (is != null){

DataInputStream dIs = new DataInputStream(is);

byte[] buffer = new byte[1024*4];

int length = 0;

while ((length = dIs.read(buffer)) >0) {

content =EncodingUtils.getString(buffer, 0, length, "UTF-8");

sb.append(content);

}

is.close();

}

} catch (IOException e) {

e.printStackTrace();

}

return sb.toString();

}

http://www.2cto.com/kf/201207/140312.html

http://blog.sina.com.cn/s/blog_933d50ba0100wq1h.html

二、Android中读写文件

(1) 从resource中的raw文件夹中获取文件并读取数据（资源文件只能读不能写，\res\raw\test.txt）

String res = "";

try{

InputStream in = getResources().openRawResource(R.raw.test);

int length = in.available();

byte [] buffer = newbyte[length];

in.read(buffer);

res = EncodingUtils.getString(buffer,"UTF-8");//选择合适的编码，如果不调整会乱码

in.close();

}catch(Exception e){

e.printStackTrace();

}

(2) 从asset中获取文件并读取数据（资源文件只能读不能写，\assets\test.txt）

与raw文件夹类似，只是：

InputStream is = getAssets().open(“test.txt”);

(3) 私有文件夹下的文件存取（/data/data/包名/files/test.txt）

使用openFileOutput写文件：

public void writeFileData(String fileName,String message){

try{

FileOutputStream fout =openFileOutput(fileName,MODE_PRIVATE);

byte [] bytes =message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

使用openFileInput读文件：

public String readFileData(String fileName){

String str = “”;

try{

FileInputStream fin =openFileInput(fileName);

int length = in.available();

byte [] bytes = newbyte[length];

fin.read(bytes);

str = EncodingUtils.getString(bytes,"UTF-8");

fin.close();

}

catch(Exception e){

e.printStackTrace();

}

return str;

}

(4) sdcard目录下的文件存取（/mnt/sdcard/）

使用FileOutputStream写文件：

public void writeFile2Sdcard(String fileName,String message){

try{

FileOutputStream fout = new FileOutputStream(fileName);

byte [] bytes =message.getBytes();

fout.write(bytes);

fout.close();

}

catch(Exception e){

e.printStackTrace();

}

}

使用FileInputStream读文件：

public String readFileFromSdcard(String fileName){

String res="";

try{

FileInputStream fin = newFileInputStream(fileName);

int length =fin.available();

byte [] buffer = newbyte[length];

fin.read(buffer);

res =EncodingUtils.getString(buffer, "UTF-8");

fin.close();

}

catch(Exception e){

e.printStackTrace();

}

return res;

}

http://dev.10086.cn/cmdn/wiki/index.php?doc-view-6017.html

http://blog.sina.com.cn/s/blog_4d25c9870100qpax.html