When Java directly read the zip file, given as follows:
java extract the zip file, java.lang.IllegalArgumentException: MALFORMED [1]
java.lang.IllegalArgumentException: MALFORMED[1]
at java.util.zip.ZipCoder.toString(ZipCoder.java:65) ~[na:1.8.0_181]
at java.util.zip.ZipFile.getZipEntry(ZipFile.java:583) ~[na:1.8.0_181]
at java.util.zip.ZipFile.access$900(ZipFile.java:60) ~[na:1.8.0_181]
at java.util.zip.ZipFile$ZipEntryIterator.next(ZipFile.java:539) ~[na:1.8.0_181]
at java.util.zip.ZipFile$ZipEntryIterator.nextElement(ZipFile.java:514) ~[na:1.8.0_181]
at java.util.zip.ZipFile$ZipEntryIterator.nextElement(ZipFile.java:495) ~[na:1.8.0_181]Simple implementation class code detection: CodeDetector.java
/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package com.ruoyi.parser;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.util.BitSet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @desc:
* @name: CodeDetector.java
* @author: tompai
* @email：[email protected]
* @createTime: 2020年3月10日 下午11:28:51
* @history:
* @version: v1.0
*/
public class CodeDetector {
private static Logger logger = LoggerFactory.getLogger(CodeDetector.class);
private static int BYTE_SIZE = 8;
public static String CODE_UTF8 = "UTF-8";
public static String CODE_UTF8_BOM = "UTF-8_BOM";
public static String CODE_GBK = "GBK";
/**
* 通过文件全名称获取编码集名称
*
* @param fullFileName
* @param ignoreBom
* @return
* @throws Exception
*/
public static String getEncode(String fullFileName, boolean ignoreBom) throws Exception {
logger.debug("fullFileName ; {}", fullFileName);
BufferedInputStream bis = new BufferedInputStream(new FileInputStream(fullFileName));
return getEncode(bis, ignoreBom);
}
/**
* 通过文件缓存流获取编码集名称，文件流必须为未曾
*
* @param bis
* @param ignoreBom 是否忽略utf-8 bom
* @return
* @throws Exception
*/
public static String getEncode(BufferedInputStream bis, boolean ignoreBom) {
String encodeType = "未识别";
try {
bis.mark(0);
byte[] head = new byte[3];
bis.read(head);
if (head[0] == -1 && head[1] == -2) {
encodeType = "UTF-16";
} else if (head[0] == -2 && head[1] == -1) {
encodeType = "Unicode";
} else if (head[0] == -17 && head[1] == -69 && head[2] == -65) { //带BOM
if (ignoreBom) {
encodeType = CODE_UTF8;
} else {
encodeType = CODE_UTF8_BOM;
}
} else if ("Unicode".equals(encodeType)) {
encodeType = "UTF-16";
} else if (isUTF8(bis)) {
encodeType = CODE_UTF8;
} else {
encodeType = CODE_GBK;
}
logger.info("result encode type : " + encodeType);
} catch (Exception e) {
// TODO: handle exception
}
return encodeType;
}
/**
* 是否是无BOM的UTF8格式，不判断常规场景，只区分无BOM UTF8和GBK
*
* @param bis
* @return
*/
private static boolean isUTF8( BufferedInputStream bis) throws Exception {
bis.reset();
//读取第一个字节
int code = bis.read();
do {
BitSet bitSet = convert2BitSet(code);
//判断是否为单字节
if (bitSet.get(0)) {//多字节时，再读取N个字节
if (!checkMultiByte(bis, bitSet)) {//未检测通过,直接返回
return false;
}
} else {
//单字节时什么都不用做，再次读取字节
}
code = bis.read();
} while (code != -1);
return true;
}
/**
* 检测多字节，判断是否为utf8，已经读取了一个字节
*
* @param bis
* @param bitSet
* @return
*/
private static boolean checkMultiByte(BufferedInputStream bis, BitSet bitSet) throws Exception {
int count = getCountOfSequential(bitSet);
byte[] bytes = new byte[count - 1];//已经读取了一个字节，不能再读取
bis.read(bytes);
for (byte b : bytes) {
if (!checkUtf8Byte(b)) {
return false;
}
}
return true;
}
/**
* 检测单字节，判断是否为utf8
*
* @param b
* @return
*/
private static boolean checkUtf8Byte(byte b) throws Exception {
BitSet bitSet = convert2BitSet(b);
return bitSet.get(0) && !bitSet.get(1);
}
/**
* 检测bitSet中从开始有多少个连续的1
*
* @param bitSet
* @return
*/
private static int getCountOfSequential( BitSet bitSet) {
int count = 0;
for (int i = 0; i < BYTE_SIZE; i++) {
if (bitSet.get(i)) {
count++;
} else {
break;
}
}
return count;
}
/**
* 将整形转为BitSet
*
* @param code
* @return
*/
private static BitSet convert2BitSet(int code) {
BitSet bitSet = new BitSet(BYTE_SIZE);
for (int i = 0; i < BYTE_SIZE; i++) {
int tmp3 = code >> (BYTE_SIZE - i - 1);
int tmp2 = 0x1 & tmp3;
if (tmp2 == 1) {
bitSet.set(i);
}
}
return bitSet;
}
/**
* 将一指定编码的文件转换为另一编码的文件
*
* @param oldFullFileName
* @param oldCharsetName
* @param newFullFileName
* @param newCharsetName
*/
public static void convert(String oldFullFileName, String oldCharsetName, String newFullFileName, String newCharsetName) throws Exception {
logger.info("the old file name is : {}, The oldCharsetName is : {}", oldFullFileName, oldCharsetName);
logger.info("the new file name is : {}, The newCharsetName is : {}", newFullFileName, newCharsetName);
StringBuffer content = new StringBuffer();
BufferedReader bin = new BufferedReader(new InputStreamReader(new FileInputStream(oldFullFileName), oldCharsetName));
String line;
while ((line = bin.readLine()) != null) {
content.append(line);
content.append(System.getProperty("line.separator"));
}
newFullFileName = newFullFileName.replace("\\", "/");
File dir = new File(newFullFileName.substring(0, newFullFileName.lastIndexOf("/")));
if (!dir.exists()) {
dir.mkdirs();
}
Writer out = new OutputStreamWriter(new FileOutputStream(newFullFileName), newCharsetName);
out.write(content.toString());
}
}
