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.
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);
}
}去除java代码中的UTF-8 BOM
