无法在windows上使用Java打印服务API打印UTF8文档

Question

我一直在尝试在windows操作系统上使用Java打印服务API打印包含俄文字母的文本文档，但到目前为止运气不佳。打印机打印文件，但unicode字符会被弄乱

运行程序时，VM参数-Dfile。已指定编码=utf8

下面是代码

    import java.io.DataInputStream;  
    import java.io.FileInputStream;  
    import java.io.UnsupportedEncodingException;  
    import javax.print.Doc;  
    import javax.print.DocFlavor;  
    import javax.print.DocPrintJob;  
    import javax.print.PrintException;  
    import javax.print.PrintService;  
    import javax.print.PrintServiceLookup;  
    import javax.print.SimpleDoc;  
    import javax.print.attribute.HashPrintRequestAttributeSet;  
    import javax.print.attribute.PrintRequestAttributeSet;  
    import javax.print.attribute.standard.Sides;  


    public class PrintUtf8Doc {


        public static void main(String[] args) throws UnsupportedEncodingException {  
            FileInputStream textstream=null;   
            DataInputStream da=null;  
            byte buff[]=new byte[1024*20];  

            try {  
                textstream = new FileInputStream("D:\\test\\russian.txt");   
                da=new DataInputStream(textstream);  
                da.read(buff);  

            } catch (Exception e) {   
                e.printStackTrace();  
            }   
            if (textstream == null) {   
                return; 
            } 
    //       Set the document type

            DocFlavor myFormat = DocFlavor.BYTE_ARRAY.AUTOSENSE;


    //       Create a Doc
            Doc myDoc = new SimpleDoc(buff, myFormat, null);   
    //       Build a set of attributes  
            PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();   
            aset.add(Sides.DUPLEX);   

            System.out.println("Host Encoding: "+myFormat.hostEncoding);  


            PrintService service = PrintServiceLookup.lookupDefaultPrintService();  
            DocFlavor flavs[]=service.getSupportedDocFlavors();
            for(DocFlavor flavor: flavs){
              System.out.println(flavor.toString());                
            }

            // Create a print job from one of the print services  
            if (service!=null) {   

                DocPrintJob printJob=service.createPrintJob();  
                try {  
                    printJob.print(myDoc, aset);  
                } catch (PrintException e) {  
                    e.printStackTrace();  
                }               

            }

        }
    }

-------------------------------------------------------------------
The supported flavors are printed in the console

Host Encoding: UTF8  
image/gif; class="[B"  
image/gif; class="java.io.InputStream"  
image/gif; class="java.net.URL"  
image/jpeg; class="[B"  
image/jpeg; class="java.io.InputStream"  
image/jpeg; class="java.net.URL"  
image/png; class="[B"  
image/png; class="java.io.InputStream"  
image/png; class="java.net.URL"  
application/x-java-jvm-local-objectref; class="java.awt.print.Pageable"  
application/x-java-jvm-local-objectref; class="java.awt.print.Printable"  
application/octet-stream; class="[B"  
application/octet-stream; class="java.net.URL"  
application/octet-stream; class="java.io.InputStream"

---

我甚至试着把docFlavor改成 “应用程序/八位字节流；^{cl 1}”$

看起来，即使平台编码设置为UTF8，windows上的Java打印服务也无法正确地对字节进行编码

是否有任何设置需要执行或纠正？ 任何建议都会大有裨益

Answer 1

我想你需要读俄语。txt在UTF-8中，我认为由于文件包含UTF-8字符，但在windows-1252中读取（如果在Java中未指定默认编码），此转换可能会导致乱码

您可以使用InputStreamReader，它将字符集作为读取（请参见下面的最后一个参数）：

BufferedReader rd = new BufferedReader(new InputStreamReader(new FileInputStream(f), "UTF-8"));

如果需要字节[]，那么您需要从上面的读卡器推断转换它的方法，因为这些公开了基于char的读API（对于缓冲读卡器，还包括读线）