BOMRemover v2.0 去除代码中的UTF8 BOM

org.xml.sax.SAXParseException: 缺少文件根组件。但是XML文件确实存在且格式正常.

原因: XML文件可能为UTF-8编码....且带有BOM签名..用UltraEdit等16进制工具打开XML,可看到前三字节为EF,BB,BF.

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解决方法..找到此XML文件,删除BOM签名...

见我的 BOM批量删除工具 BOMRemoverV2.0

此工具来源于BOMRemover 在此基础上完美了下方法...主要增加了 noBomFile方法 ,以检测文件是否为BOM签名文件.

使用方法:

1.trimBom   去掉单个文件的BOM头

2.DealSrcFiles 去掉某个文件夹下的文件BOM头...

import java.io.BufferedReader; import java.io.ByteArrayOutputStream; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.io.InputStream; import java.io.PushbackInputStream; import java.util.ArrayList; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Set; public class BOMRemover { /** * ant 编译之后的result文件，注意要编译提示错误的文件名要在同一行 可以设置命令提示窗口的缓冲区大小实现 * * @param resultFileName */ public static Set getFileNamesFromCompileResult(String resultFileName) throws java.io.IOException { Set set = new HashSet(); BufferedReader reader = new BufferedReader(new FileReader( resultFileName)); String start = "[javac] "; int startLen = start.length(); String end = ".java:"; int endLen = end.length(); String errMsg = "//65279"; while (reader.ready()) { String line = reader.readLine(); int indexStart = line.indexOf(start); if (line.indexOf(errMsg) == -1) { continue; } if (indexStart != -1) { int indexEnd = line.indexOf(end); if (indexEnd != -1) { String name = line.substring(indexStart + startLen, indexEnd + endLen - 1); set.add(name.trim()); } } } return set; } //trim dir public static void DealSrcFiles(String path) { if (path.charAt(path.length() - 1) != '//') { path += '//'; } File file = new File(path); if (!file.exists()) { System.out.println("Error: Path not Existed! Please Check it out!"); return; } String[] filelist = file.list(); for (int i = 0; i < filelist.length; i++) { File temp = new File(path + filelist[i]); if ((temp.isDirectory() && !temp.isHidden() && temp.exists())) { DealSrcFiles(path + filelist[i]); } else { if (filelist[i].endsWith(".xml")) { try { // System.out.println(path + filelist[i]); trimBom(path + filelist[i]); } catch (Exception eee) { System.out.println(eee.getMessage()); } } } } } /** * 读取流中前面的字符，看是否有bom，如果有bom，将bom头先读掉丢弃 * * @param in * @return * @throws IOException */ public static InputStream getInputStream(InputStream in) throws IOException { PushbackInputStream testin = new PushbackInputStream(in); int ch = testin.read(); if (ch != 0xEF) { testin.unread(ch); } else if ((ch = testin.read()) != 0xBB) { // if ch==0xef testin.unread(ch); testin.unread(0xef); } else if ((ch = testin.read()) != 0xBF) { // if ch ==0xbb throw new IOException("错误的UTF-8格式文件"); } else { // if ch ==0xbf // 不需要做，这里是bom头被读完了 // // System.out.println("still exist bom"); } return testin; } /** * 根据一个文件名，读取完文件，干掉bom头。 * * @param fileName * @throws IOException */ public static void trimBom(String fileName) throws IOException { if (noBomFile(fileName)) { System.out.println("skip :" + fileName); return; } FileInputStream fin = new FileInputStream(fileName); // 开始写临时文件 InputStream in = getInputStream(fin); ByteArrayOutputStream bos = new ByteArrayOutputStream(); byte b[] = new byte[4096]; int len = 0; while (in.available() > 0) { len = in.read(b, 0, 4096); // out.write(b, 0, len); bos.write(b, 0, len); } in.close(); fin.close(); bos.close(); // 临时文件写完，开始将临时文件写回本文件。 System.out.println("[" + fileName + "]"); FileOutputStream out = new FileOutputStream(fileName); out.write(bos.toByteArray()); out.close(); System.out.println("PROCESS FILE " + fileName); } // check the file is or not bom file private static boolean noBomFile(String fname) throws IOException { FileInputStream fin = new FileInputStream(fname); PushbackInputStream testin = new PushbackInputStream(fin); int ch = testin.read(); int ch2 = testin.read(); int ch3 = testin.read(); if (ch == 0xEF && ch2 == 0xBB && ch3 == 0xBF) { return false; // is bom file } else { return true; } } /** * 根据ant编译错误来去除bom * * @param resultFile * @throws IOException */ // public static void trimBomByCompileResult(String resultFile) // throws IOException { // Set set = getFileNamesFromCompileResult(resultFile); // // for (Iterator it = set.iterator(); it.hasNext();) { // String fName = it.next().toString(); // trimBom(fName); // } // // } public static void main(String[] args) throws IOException { // if(args.length==0){ // DealSrcFiles(System.getProperty("user.dir")); // } // else{ // DealSrcFiles(args[0]); // } String path = "D://Documents and Settings//Administrator//桌面//0301//de bom xml"; DealSrcFiles(path); } }

原工具来源于 http://hi.baidu.com/joyfun/blog/item/ca926f06c40cc0710308815b.html

去除java代码中的UTF-8 BOM