bytearrayoutputstream

问题 I hope you guys can help me with this one. I'm not sure if it is a bug in Java or if I'm doing something wrong, but I'll go with the latter. I want to turn a BufferedImage into a GIF image. I then wish to keep the GIF in the memory in the form of a byte array. (I do not want to save the file to disk) The program should capture a screen segment (just to create a quick image) and turn it into a GIF byte array using ImageIO ImageWriter and ByteArrayOutputStream. The code below will show you the

问题 I hope you guys can help me with this one. I'm not sure if it is a bug in Java or if I'm doing something wrong, but I'll go with the latter. I want to turn a BufferedImage into a GIF image. I then wish to keep the GIF in the memory in the form of a byte array. (I do not want to save the file to disk) The program should capture a screen segment (just to create a quick image) and turn it into a GIF byte array using ImageIO ImageWriter and ByteArrayOutputStream. The code below will show you the

问题 I would like to convert this code: import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.parquet.column.page.PageReadStore; import org.apache.parquet.example.data.simple.SimpleGroup; import org.apache.parquet.example.data.simple.convert.GroupRecordConverter; import org.apache.parquet.hadoop.ParquetFileReader; import org.apache.parquet.hadoop.util.HadoopInputFile; import org.apache.parquet.io.ColumnIOFactory; import org.apache.parquet.io

问题 I would like to convert this code: import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.parquet.column.page.PageReadStore; import org.apache.parquet.example.data.simple.SimpleGroup; import org.apache.parquet.example.data.simple.convert.GroupRecordConverter; import org.apache.parquet.hadoop.ParquetFileReader; import org.apache.parquet.hadoop.util.HadoopInputFile; import org.apache.parquet.io.ColumnIOFactory; import org.apache.parquet.io

问题 I would like to convert this code: import org.apache.hadoop.conf.Configuration; import org.apache.hadoop.fs.Path; import org.apache.parquet.column.page.PageReadStore; import org.apache.parquet.example.data.simple.SimpleGroup; import org.apache.parquet.example.data.simple.convert.GroupRecordConverter; import org.apache.parquet.hadoop.ParquetFileReader; import org.apache.parquet.hadoop.util.HadoopInputFile; import org.apache.parquet.io.ColumnIOFactory; import org.apache.parquet.io

问题 I've to save a pdf file represented as a ByteArrayOutputStream into a Blob SQL field of a table, here's my code: public boolean savePDF(int version, ByteArrayOutputStream baos) throws Exception{ boolean completed = false; ConnectionManager conn = new ConnectionManager(); try { PreparedStatement statement = conn.getConnection().prepareStatement(INSERT_PDF); statement.setLong(1, version); statement.setBlob(2, (Blob)baos); statement.execute(); conn.commit(); completed = true; } catch

问题 When loading a picture into byte[] in smartphone app sometimes ByteArrayOutputStream gives me nullpointerexception any explanation? Bitmap bm = BitmapFactory.decodeFile(path); System.out.println("BITMAP: "+bm != null); ByteArrayOutputStream buffer = new ByteArrayOutputStream(); bm.compress(CompressFormat.JPEG, 100, buffer); 回答1: Are you sure it's ByteArrayOutputStream that's giving you the NullPointerException? Or is it happening at bm.compress? bm can be null - likely due to you passing in

问题 When loading a picture into byte[] in smartphone app sometimes ByteArrayOutputStream gives me nullpointerexception any explanation? Bitmap bm = BitmapFactory.decodeFile(path); System.out.println("BITMAP: "+bm != null); ByteArrayOutputStream buffer = new ByteArrayOutputStream(); bm.compress(CompressFormat.JPEG, 100, buffer); 回答1: Are you sure it's ByteArrayOutputStream that's giving you the NullPointerException? Or is it happening at bm.compress? bm can be null - likely due to you passing in

问题 I am trying to compress file with Java ByteArrayOutputstream,but I failed.If I change the ouputstream to FileOutput stream,it can work.What should I do to make it work?and why? Here is my code(Sorrry,my english is so poor): import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileOutputStream; import java.io.IOException; import java.io.OutputStream; import java.nio.charset.Charset; import java.util.zip.ZipEntry; import java.util.zip.ZipOutputStream; import org.apache

问题 I am currently reading a file from then writing it to an HTTP connection which saves the file locally to disk - it's working fine. However, because of the environment I'm working within I cannot read files from disk, rather they are pulled from a database and stored in a ByteArrayOutputStream in my java code. So instead of starting by reading a file from disk, I need to use a ByteOutputArrayStream and write that to an http connection instead. I need an efficient method to do this - If I can