Java 从现有base64编码保存Excel文件
我有一个Excel文件的现有base64编码,我想将该数据(fileContent)保存到一个物理Excel文件中,但我一直在这样做。我看过一些关于如何编码的教程,但我无法让它将数据保存到可以用Microsoft Excel打开的文件中。我尝试的解决方案将所有数据打印为excel条目(见附图)。我有,但我不知道编码的数据是一个实际的.xls文件 下面是实现这一点的代码:Java 从现有base64编码保存Excel文件,java,excel,sax,Java,Excel,Sax,我有一个Excel文件的现有base64编码,我想将该数据(fileContent)保存到一个物理Excel文件中,但我一直在这样做。我看过一些关于如何编码的教程,但我无法让它将数据保存到可以用Microsoft Excel打开的文件中。我尝试的解决方案将所有数据打印为excel条目(见附图)。我有,但我不知道编码的数据是一个实际的.xls文件 下面是实现这一点的代码: package parsing; import java.io.BufferedInputStream; import ja
package parsing;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.bind.DatatypeConverter;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
public class SaxSample {
public static void main(String argv[]) {
try {
SAXParserFactory factory = SAXParserFactory.newInstance();
SAXParser saxParser = factory.newSAXParser();
DefaultHandler handler = new DefaultHandler() {
StringBuilder value;
@Override
public void startElement(String uri, String localName,
String qName, Attributes attributes)
throws SAXException {
value = new StringBuilder();
}
@Override
public void endElement(String uri, String localName,
String qName) throws SAXException {
if ("fileContent".equalsIgnoreCase(qName)) {
FileInputStream fis = null;
try {
String decodedValue = new String(DatatypeConverter.parseBase64Binary(value.toString()));
value.append(decodedValue);
// The name of the file to create.
String fileName = "temp.xls";
File file = new File(fileName);
fis = new FileInputStream(file);
BufferedInputStream inputStream = new BufferedInputStream(fis);
byte[] fileBytes = new byte[(int) file.length()];
inputStream.read(fileBytes);
inputStream.close();
System.out.println(qName + " = " + decodedValue);
} catch (FileNotFoundException ex) {
Logger.getLogger(SaxSample.class.getName()).log(Level.SEVERE, null, ex);
} catch (IOException ex) {
Logger.getLogger(SaxSample.class.getName()).log(Level.SEVERE, null, ex);
} finally {
try {
fis.close();
} catch (IOException ex) {
Logger.getLogger(SaxSample.class.getName()).log(Level.SEVERE, null, ex);
}
}
} else {
System.out.println(qName + " = " + value);
}
value = new StringBuilder();
}
@Override
public void characters(char ch[], int start, int length)
throws SAXException {
value.append(new String(ch, start, length));
}
};
saxParser.parse(new File("src/parsing/CON729.xml"), handler);
} catch (ParserConfigurationException | SAXException | IOException e) {
e.printStackTrace();
}
}
}
我不确定您想在方法
endElement(…)
中做什么,但如果您想获得一个可读的excel文件,只需将编码的base64转换为字节数组(而不是另一个字符串)I。E更改您的endElement(…)
如下所示:
@Override
public void endElement(String uri, String localName,
String qName) throws SAXException {
if ("fileContent".equalsIgnoreCase(qName)) {
try {
Files.write(Paths.get("temp.xls"), DatatypeConverter.parseBase64Binary(value.toString()));
} catch (IOException ex) {
Logger.getLogger(SaxSample.class.getName()).log(Level.SEVERE, null, ex);
}
} else {
// I'm still not sure why you're printing this ... debugging?
System.out.println(qName + " = " + value);
}
}
您唯一需要做的是:
- 获取元素
的内容(您已经在这样做了)fileContent
- 将此内容解码为字节数组
- 将此字节数组保存在文件中(无需进一步转换)
需要运行时个性化
public static void storetoExcelandOpen(Context context, String base,String name) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/WorkBox");
if (!myDir.exists()) {
myDir.mkdirs();
}
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = name+n+".xlsx";
File file = new File(myDir, fname);
if (file.exists())
file.delete();
try {
FileOutputStream out = new FileOutputStream(file);
byte[] excelAsBytes = Base64.decode(base, 0);
out.write(excelAsBytes);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
File dir = new File(Environment.getExternalStorageDirectory(), "WorkBox");
File imgFile = new File(dir, fname);
Intent sendIntent = new Intent(Intent.ACTION_VIEW);
Uri uri;
if (Build.VERSION.SDK_INT < 24) {
uri = Uri.fromFile(file);
} else {
uri = Uri.parse("file://" + imgFile); // My work-around for new SDKs, causes ActivityNotFoundException in API 10.
}
sendIntent.setDataAndType(uri, "application/vnd.ms-excel");
sendIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sendIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
context.startActivity(sendIntent);
}
publicstaticvoidstoretoexcelandopen(上下文上下文、字符串基、字符串名){
String root=Environment.getExternalStorageDirectory().toString();
File myDir=新文件(root+“/WorkBox”);
如果(!myDir.exists()){
myDir.mkdirs();
}
随机生成器=新随机();
int n=10000;
n=发电机。下一个(n);
字符串fname=name+n+“.xlsx”;
File File=新文件(myDir,fname);
if(file.exists())
delete();
试一试{
FileOutputStream out=新的FileOutputStream(文件);
字节[]excelAsBytes=Base64.解码(base,0);
out.write(excelAsBytes);
out.flush();
out.close();
}捕获(例外e){
e、 printStackTrace();
}
File dir=新文件(Environment.getExternalStorageDirectory(),“WorkBox”);
File imgFile=新文件(dir,fname);
Intent sendIntent=新的Intent(Intent.ACTION\u视图);
Uri;
如果(Build.VERSION.SDK_INT<24){
uri=uri.fromFile(文件);
}否则{
uri=uri.parse(“文件://“+imgFile);//我对新SDK的处理导致API 10中的ActivityNotFoundException。
}
setDataAndType(uri,“application/vnd.ms excel”);
sendIntent.setFlags(Intent.FLAG\u活动\u新任务);
sendIntent.addFlags(Intent.FLAG\授予\读取\ URI\权限);
背景。起始触觉(sendIntent);
}
public static void storetoExcelandOpen(Context context, String base,String name) {
String root = Environment.getExternalStorageDirectory().toString();
File myDir = new File(root + "/WorkBox");
if (!myDir.exists()) {
myDir.mkdirs();
}
Random generator = new Random();
int n = 10000;
n = generator.nextInt(n);
String fname = name+n+".xlsx";
File file = new File(myDir, fname);
if (file.exists())
file.delete();
try {
FileOutputStream out = new FileOutputStream(file);
byte[] excelAsBytes = Base64.decode(base, 0);
out.write(excelAsBytes);
out.flush();
out.close();
} catch (Exception e) {
e.printStackTrace();
}
File dir = new File(Environment.getExternalStorageDirectory(), "WorkBox");
File imgFile = new File(dir, fname);
Intent sendIntent = new Intent(Intent.ACTION_VIEW);
Uri uri;
if (Build.VERSION.SDK_INT < 24) {
uri = Uri.fromFile(file);
} else {
uri = Uri.parse("file://" + imgFile); // My work-around for new SDKs, causes ActivityNotFoundException in API 10.
}
sendIntent.setDataAndType(uri, "application/vnd.ms-excel");
sendIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
sendIntent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
context.startActivity(sendIntent);
}