文件取值以及字符串存至文件中

package faengine;import junit.framework.TestCase;import java.io.*;import java.util.zip.InflaterInputStream;public class TestByteArrayOutputStream extends TestCase {public static final int StreamFlushBufferSzie=100;//buffer size= 1K /** * 输入流或者输出流转化成 ByteArrayOutputStream * @param obj * @param bufferSize * @return */ public static ByteArrayOutputStream castToBAOStream(Object obj,int bufferSize){ByteArrayOutputStream baos=new ByteArrayOutputStream();if(obj.getClass().isInstance(baos)){return (ByteArrayOutputStream)obj;}else{InputStream fis;try{fis=(FileInputStream)obj;try{BufferedInputStream bis=new BufferedInputStream(fis); baos=new ByteArrayOutputStream(); BufferedOutputStream bos=new BufferedOutputStream(baos); int ch; int i=0;while((ch=bis.read())!=-1){ bos.write(ch); if(i++==bufferSize){bos.flush();i=0;}} bos.flush();//提交文件流，很关键bis.close(); return baos;}catch(ClassCastException e){//logger.info("Stream object not a ByteArrayOutputStream or a FileInputStream:",e);return null;}catch(Exception e){//logger.info("baos is null:",e);return null;}}catch(ClassCastException e){fis=(InflaterInputStream)obj;try{baos=new ByteArrayOutputStream(); BufferedOutputStream bos=new BufferedOutputStream(baos); int ch; int i=0;//ii.read(b, off, len)byte[] by = new byte[2048];while((ch=fis.read(by))!=-1){ bos.write(by,0,ch); if(i++==bufferSize){bos.flush();i=0;}} bos.flush();//提交文件流，很关键fis.close(); //ZipUtil.getZipName().close();return baos;}catch(ClassCastException e1){//logger.info("Stream object not a ByteArrayOutputStream or a FileInputStream:",e1);return null;}catch(Exception e1){//logger.info("baos is null:",e1);return null;}}}}private InputStream getInputStream() throws FileNotFoundException {File file = new File("d://ac.xml");FileInputStream in = new FileInputStream(file);return in;} public String getFAXML() throws FileNotFoundException { InputStream in = this.getInputStream(); ByteArrayOutputStream baos = castToBAOStream(in,StreamFlushBufferSzie); return baos.toString(); } public void getOutXML(String str) throws UnsupportedEncodingException, IOException { File file = new File("d://a.xml");FileOutputStream out = new FileOutputStream(file); out.write(str.getBytes("UTF-8"));out.write(str.getBytes());out.flush();out.close(); } }