java 读取 Zip 存档中的文件并将其内容放入 Android 中的字符串中
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Read a file inside a Zip archive and put its content into a String in Android
提问by Daniel
this is my first question, although I've already used so many tips from Stack Overflow. But for this situation I haven't found a solution yet.
这是我的第一个问题，尽管我已经使用了 Stack Overflow 的很多技巧。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. I don't want the file to be written to sdcard, I just want to perform a memory operation.
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 String 变量中，该变量将被返回并放入 Android 中的 TextView 中。我不想将文件写入sdcard，我只想执行内存操作。
For example, inside db.zip I have a file named packed.txt, which content is "Stack á é ?". 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. I tried so far converting'em to a human-readble form, but no success. Tried InputStreamReader but I couldn't make a correct use of it. My source-code is below.
例如，在 db.zip 中，我有一个名为packed.txt 的文件，其内容是“Stack á é ?”。我的方法中返回的字符串显示“83 116 97 99 107 32 195 161 32 (...)”，它们是字符的 UTF-8 值。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。尝试了 InputStreamReader 但我无法正确使用它。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();
}
}
}
回答by Dave G
Sorry for my initial posting of this .... ran right over your paragraph stating you had tried this.
抱歉，我最初发布此内容.... 正好在您的段落上，说明您已尝试过此操作。
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.
请尝试以上方法，看看效果如何。
回答by Luiz Cavalcanti
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();
回答by Marcelo reis
...
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;
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