1.修改包结构为cn.keking,
2.新增压缩包内文件名称排序
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package cn.keking.utils;
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import cn.keking.param.ReturnResponse;
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import org.springframework.beans.factory.annotation.Value;
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import org.springframework.stereotype.Component;
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import java.io.*;
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import java.net.*;
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import java.nio.charset.Charset;
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import java.util.UUID;
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/**
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* @author yudian-it
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*/
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@Component
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public class DownloadUtils {
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@Value("${file.dir}")
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String fileDir;
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/**
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* 一开始测试的时候发现有些文件没有下载下来，而有些可以；当时也是郁闷了好一阵，但是最终还是不得解
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* 再次测试的时候，通过前台对比url发现，原来参数中有+号特殊字符存在，但是到后之后却变成了空格，突然恍然大悟
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* 应该是转义出了问题，url转义中会把+号当成空格来计算，所以才会出现这种情况，遂想要通过整体替换空格为加号，因为url
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* 中的参数部分是不会出现空格的，但是文件名中就不好确定了，所以只对url参数部分做替换
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* 注: 针对URLEncoder.encode(s,charset)会将空格转成+的情况需要做下面的替换工作
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* @param urlAddress
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* @param type
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* @return
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*/
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public ReturnResponse<String> downLoad(String urlAddress, String type, String fileName){
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ReturnResponse<String> response = new ReturnResponse<>(0, "下载成功!!!", "");
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URL url = null;
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try {
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urlAddress = replacePlusMark(urlAddress);
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urlAddress = encodeUrlParam(urlAddress);
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// 因为tomcat不能处理'+'号，所以讲'+'号替换成'%20%'
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urlAddress = urlAddress.replaceAll("\\+", "%20");
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url = new URL(urlAddress);
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} catch (MalformedURLException e) {
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e.printStackTrace();
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}
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UUID uuid = UUID.randomUUID();
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if (null == fileName) {
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fileName = uuid+ "."+type;
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}else { // 文件后缀不一致时，以type为准(针对simText【将类txt文件转为txt】)
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fileName = fileName.replace(fileName.substring(fileName.lastIndexOf(".") + 1), type);
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}
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String realPath = fileDir + fileName;
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File dirFile = new File(fileDir);
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if (!dirFile.exists()) {
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dirFile.mkdirs();
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}
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try {
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URLConnection connection = url.openConnection();
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InputStream in = connection.getInputStream();
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FileOutputStream os = new FileOutputStream(realPath);
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byte[] buffer = new byte[4 * 1024];
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int read;
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while ((read = in.read(buffer)) > 0) {
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os.write(buffer, 0, read);
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}
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os.close();
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in.close();
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response.setContent(realPath);
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// 同样针对类txt文件，如果成功msg包含的是转换后的文件名
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response.setMsg(fileName);
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// txt转换文件编码为utf8
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if("txt".equals(type)){
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convertTextPlainFileCharsetToUtf8(realPath);
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}
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return response;
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} catch (IOException e) {
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e.printStackTrace();
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response.setCode(1);
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response.setContent(null);
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if (e instanceof FileNotFoundException) {
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response.setMsg("文件不存在!!!");
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}else {
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response.setMsg(e.getMessage());
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}
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return response;
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}
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}
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/**
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* 注:可能是原来因为前端通过encodeURI来编码的，因为通过encodeURI编码+会被转成+号(亦即没有转)，
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* 而通过encodeURIComponent则会转成%2B，这样URLDecoder是可以正确处理的，所以也就没有必要在这里替换了
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* 转换url参数部分的空格为加号(因为在url编解码的过程中出现+转为空格的情况)
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* @param urlAddress
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* @return
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*/
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private String replacePlusMark(String urlAddress) {
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if (urlAddress.contains("?")) {
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String nonParamStr = urlAddress.substring(0,urlAddress.indexOf("?") + 1);
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String paramStr = urlAddress.substring(nonParamStr.length());
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return nonParamStr + paramStr.replace(" ", "+");
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}
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return urlAddress;
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}
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/**
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* 对最有一个路径进行转码
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* @param urlAddress
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* http://192.168.2.111:8013/demo/Handle中文.zip
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* @return
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*/
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private String encodeUrlParam(String urlAddress) {
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String newUrl = "";
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try {
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String path = "";
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String param = "";
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if (urlAddress.contains("?")) {
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path = urlAddress.substring(0, urlAddress.indexOf("?"));
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param = urlAddress.substring(urlAddress.indexOf("?"));
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}else {
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path = urlAddress;
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}
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String lastPath = path.substring(path.lastIndexOf("/") + 1);
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String leftPath = path.substring(0, path.lastIndexOf("/") + 1);
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String encodeLastPath = URLEncoder.encode(lastPath, "UTF-8");
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newUrl += leftPath + encodeLastPath;
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if (urlAddress.contains("?")) {
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newUrl += param;
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}
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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return newUrl;
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}
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/**
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* 因为jodConvert2.1不支持ms2013版本的office转换，这里偷懒，尝试看改一下文件类型，让jodConvert2.1去
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* 处理ms2013，看结果如何，如果问题很大的话只能采取其他方式，如果没有问题，暂时使用该版本来转换
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* @param type
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* @return
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*/
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private String dealWithMS2013(String type) {
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String newType = null;
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switch (type){
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case "docx":
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newType = "doc";
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break;
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case "xlsx":
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newType = "doc";
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break;
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case "pptx":
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newType = "ppt";
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break;
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default:
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newType = type;
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break;
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}
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return newType;
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}
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/**
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* 转换文本文件编码为utf8
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* 探测源文件编码,探测到编码切不为utf8则进行转码
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* @param filePath 文件路径
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*/
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private static void convertTextPlainFileCharsetToUtf8(String filePath) throws IOException {
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File sourceFile = new File(filePath);
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if(sourceFile.exists() && sourceFile.isFile() && sourceFile.canRead()) {
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String encoding = null;
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try {
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FileCharsetDetector.Observer observer = FileCharsetDetector.guessFileEncoding(sourceFile);
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// 为准确探测到编码,不适用猜测的编码
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encoding = observer.isFound()?observer.getEncoding():null;
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// 为准确探测到编码,可以考虑使用GBK 大部分文件都是windows系统产生的
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} catch (IOException e) {
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// 编码探测失败,
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e.printStackTrace();
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}
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if(encoding != null && !"UTF-8".equals(encoding)){
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// 不为utf8,进行转码
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File tmpUtf8File = new File(filePath+".utf8");
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Writer writer = new OutputStreamWriter(new FileOutputStream(tmpUtf8File),"UTF-8");
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Reader reader = new BufferedReader(new InputStreamReader(new FileInputStream(sourceFile),encoding));
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char[] buf = new char[1024];
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int read;
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while ((read = reader.read(buf)) > 0){
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writer.write(buf, 0, read);
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}
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reader.close();
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writer.close();
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// 删除源文件
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sourceFile.delete();
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// 重命名
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tmpUtf8File.renameTo(sourceFile);
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}
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}
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}
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}
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