[英]Read a file inside a Zip archive and put its content into a String in Android
this is my first question, although I've already used so many tips from Stack Overflow.这是我的第一个问题,尽管我已经使用了 Stack Overflow 的很多技巧。 But for this situation I haven't found a solution yet.
但是对于这种情况,我还没有找到解决方案。
Here's the situation: I have a zipped file and I want to read a specific file and put its content into a String variable, that will be returned and put into a TextView in Android.情况如下:我有一个压缩文件,我想读取一个特定文件并将其内容放入一个字符串变量中,该变量将被返回并放入 Android 中的 TextView 中。 I don't want the file to be written to sdcard, I just want to perform a memory operation.
我不想将文件写入 sdcard,我只想执行 memory 操作。
For example, inside db.zip I have a file named packed.txt, which content is "Stack á é ç".例如,在 db.zip 中,我有一个名为 packed.txt 的文件,其内容是“Stack á é ç”。 The returned String in my method shows "83 116 97 99 107 32 195 161 32 (...)" which are the UTF-8 values for the characters.
我的方法中返回的字符串显示“83 116 97 99 107 32 195 161 32 (...)”,这是字符的 UTF-8 值。 I tried so far converting'em to a human-readble form, but no success.
到目前为止,我尝试将它们转换为人类可读的形式,但没有成功。 Tried InputStreamReader but I couldn't make a correct use of it.
尝试过 InputStreamReader 但我无法正确使用它。 My source-code is below.
我的源代码如下。
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.util.zip.ZipEntry;
import java.util.zip.ZipInputStream;
import android.util.Log;
/**
*
* @author jon
*/
public class Decompress {
private String _zipFile;
private String _location;
public Decompress(String zipFile, String location) {
_zipFile = zipFile;
_location = location;
_dirChecker("");
}
public String unzip(String desiredFile) {
String strUnzipped = "";
try {
FileInputStream fin = new FileInputStream(_zipFile);
ZipInputStream zin = new ZipInputStream(fin);
ZipEntry ze = null;
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
//FileOutputStream fout = new FileOutputStream(_location + ze.getName());
/**** Changes made below ****/
if (ze.getName().toString().equals(desiredFile)) {
byte[] bytes = new byte[(int) ze.getSize()];
if (zin.read(bytes, 0, bytes.length) == bytes.length) {
strUnzipped = new String(bytes, "UTF-8");
}
else {
strUnzipped = "Read error...";
}
/*** REMOVED
if (ze.getName() == desiredFile) {
for (int c = zin.read(); c != -1; c = zin.read()) {
strUnzipped += c;
//fout.write(c);
} */
}
zin.closeEntry();
//fout.close();
}
}
zin.close();
} catch(Exception e) {
Log.e("Decompress", "unzip", e);
}
return strUnzipped;
}
private void _dirChecker(String dir) {
File f = new File(_location + dir);
if(!f.isDirectory()) {
f.mkdirs();
}
}
}
Sorry for my initial posting of this.... ran right over your paragraph stating you had tried this.很抱歉我最初发布这个....跑过你的段落,说你已经尝试过这个。
You can create the InputStreamReader with a charset of "UTF-8" which will automatically convert the input data into the correct characters for you.您可以使用“UTF-8”字符集创建 InputStreamReader,它会自动将输入数据转换为正确的字符。
while ((ze = zin.getNextEntry()) != null) {
Log.v("Decompress", "Unzipping " + ze.getName());
if(ze.isDirectory()) {
_dirChecker(ze.getName());
} else {
if (ze.getName() == desiredFile) {
byte[] bytes= new byte[ze.getSize()];
zin.read(bytes, 0, bytes.length);
strUnzipped= new String( bytes, "UTF-8" );
/* Removing this as it is easier to just read all the bytes in at once
InputStreamReader isr= new InputStreamReader(zin, "UTF-8");
char c= 0;
for (char c = isr.read(); c != -1; c = isr.read()) {
strUnzipped += c;
}
*/
}
zin.closeEntry();
}
}
Please try the above and see how it works out.请尝试上述方法,看看效果如何。
Why not load them into a byte array and use new String(byte[]) or use the StringBuilder?为什么不将它们加载到字节数组中并使用 new String(byte[]) 或使用 StringBuilder?
StringBuilder sb = new StringBuilder();
for (int c = zin.read(); c != -1; c = zin.read()) {
sb.append((byte)c);
}
...
return sb.toString();
...
while ((ze = zis.getNextEntry()) != null) {
if (ze.getName().equalsIgnoreCase(desiredFile)) {
byte[] buffer = new byte[1024];
String texto="";
while (zis.read(buffer) > 0) {
texto+=new String(buffer,"ISO-8859-1");
}
break;
}
}
return texto;返回文本;
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