FileUtils.downFile优化,支持手机播放视频。感谢Nice味道
This commit is contained in:
thinkgem
@@ -3,7 +3,6 @@
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*/
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*/
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package com.jeesite.common.io;
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package com.jeesite.common.io;
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import java.io.BufferedOutputStream;
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import java.io.File;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.FileNotFoundException;
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@@ -16,6 +15,7 @@ import java.util.Enumeration;
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import java.util.List;
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import java.util.List;
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import javax.activation.MimetypesFileTypeMap;
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import javax.activation.MimetypesFileTypeMap;
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import javax.servlet.ServletOutputStream;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletRequest;
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import javax.servlet.http.HttpServletResponse;
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import javax.servlet.http.HttpServletResponse;
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@@ -697,136 +697,79 @@ public class FileUtils extends org.apache.commons.io.FileUtils {
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* @return 返回错误信息，无错误信息返回null
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* @return 返回错误信息，无错误信息返回null
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*/
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*/
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public static String downFile(File file, HttpServletRequest request, HttpServletResponse response, String fileName){
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public static String downFile(File file, HttpServletRequest request, HttpServletResponse response, String fileName){
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long fileLength = file.length(); // 记录文件大小
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if (file == null || !file.exists() || file.length() <= 0){
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long pastLength = 0; // 记录已下载文件大小
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return "文件为空或不存在！";
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int rangeSwitch = 0; // 0：从头开始的全文下载；1：从某字节开始的下载（bytes=27000-）；2：从某字节开始到某字节结束的下载（bytes=27000-39000）
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long toLength = 0; // 记录客户端需要下载的字节段的最后一个字节偏移量（比如bytes=27000-39000，则这个值是为39000）
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long contentLength = 0; // 客户端请求的字节总量
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String rangeBytes = ""; // 记录客户端传来的形如“bytes=27000-”或者“bytes=27000-39000”的内容
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RandomAccessFile raf = null; // 负责读取数据
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OutputStream os = null; // 写出数据
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OutputStream out = null; // 缓冲
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byte b[] = new byte[1024]; // 暂存容器
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if (request.getHeader("Range") != null) { // 客户端请求的下载的文件块的开始字节
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response.setStatus(javax.servlet.http.HttpServletResponse.SC_PARTIAL_CONTENT);
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logger.debug("request.getHeader(\"Range\") = " + request.getHeader("Range"));
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rangeBytes = request.getHeader("Range").replaceAll("bytes=", "");
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if (rangeBytes.indexOf('-') == rangeBytes.length() - 1) {// bytes=969998336-
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rangeSwitch = 1;
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rangeBytes = rangeBytes.substring(0, rangeBytes.indexOf('-'));
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pastLength = Long.parseLong(rangeBytes.trim());
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contentLength = fileLength - pastLength; // 客户端请求的是 969998336 之后的字节
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} else { // bytes=1275856879-1275877358
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rangeSwitch = 2;
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String temp0 = rangeBytes.substring(0, rangeBytes.indexOf('-'));
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String temp2 = rangeBytes.substring(rangeBytes.indexOf('-') + 1, rangeBytes.length());
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pastLength = Long.parseLong(temp0.trim()); // bytes=1275856879-1275877358，从第 1275856879 个字节开始下载
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toLength = Long.parseLong(temp2); // bytes=1275856879-1275877358，到第 1275877358 个字节结束
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contentLength = toLength - pastLength; // 客户端请求的是 1275856879-1275877358 之间的字节
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}
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} else { // 从开始进行下载
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contentLength = fileLength; // 客户端要求全文下载
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}
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}
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try(RandomAccessFile randomFile = new RandomAccessFile(file, "r");
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// 如果设设置了Content-Length，则客户端会自动进行多线程下载。如果不希望支持多线程，则不要设置这个参数。 响应的格式是:
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ServletOutputStream out = response.getOutputStream()) {
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// Content-Length: [文件的总大小] - [客户端请求的下载的文件块的开始字节]
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long contentLength = randomFile.length();
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// ServletActionContext.getResponse().setHeader("Content- Length", new Long(file.length() - p).toString());
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String range = request.getHeader("Range");
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response.reset(); // 告诉客户端允许断点续传多线程连接下载,响应的格式是:Accept-Ranges: bytes
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long start = 0, end = 0;
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if (pastLength != 0) {
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if (range != null && range.startsWith("bytes=")) {
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response.setHeader("Accept-Ranges", "bytes");// 如果是第一次下,还没有断点续传,状态是默认的 200,无需显式设置;响应的格式是:HTTP/1.1 200 OK
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String[] values = range.split("=")[1].split("-");
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// 不是从最开始下载, 响应的格式是: Content-Range: bytes [文件块的开始字节]-[文件的总大小 - 1]/[文件的总大小]
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start = Long.parseLong(values[0]);
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logger.debug("服务器即将开始断点续传...");
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if (values.length > 1) {
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switch (rangeSwitch) {
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end = Long.parseLong(values[1]);
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case 1: { // 针对 bytes=27000- 的请求
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String contentRange = new StringBuffer("bytes ").append(new Long(pastLength).toString()).append("-")
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.append(new Long(fileLength - 1).toString()).append("/").append(new Long(fileLength).toString()).toString();
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response.setHeader("Content-Range", contentRange);
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break;
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}
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case 2: { // 针对 bytes=27000-39000 的请求
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String contentRange = rangeBytes + "/" + new Long(fileLength).toString();
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response.setHeader("Content-Range", contentRange);
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break;
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}
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default: {
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break;
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}
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}
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}
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}
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}
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int requestSize = 0;
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if (end != 0 && end > start) {
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try {
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requestSize = Long.valueOf(end - start + 1).intValue();
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} else {
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requestSize = Integer.MAX_VALUE;
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}
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response.setContentType(FileUtils.getContentType(file.getName()));
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boolean isPreview = "preview".equalsIgnoreCase(request.getParameter("source"));
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boolean isPreview = "preview".equalsIgnoreCase(request.getParameter("source"));
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response.addHeader("Content-Disposition", (!isPreview ? "attachment; " : "") + "filename=\"" +
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String fileNameEncode = EncodeUtils.encodeUrl(StringUtils.isBlank(fileName) ? file.getName() : fileName);
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EncodeUtils.encodeUrl(StringUtils.isBlank(fileName) ? file.getName() : fileName) + "\"");
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response.addHeader("Content-Disposition", (!isPreview ? "attachment; " : "") + "filename=\"" + fileNameEncode + "\"");
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response.setContentType(FileUtils.getContentType(file.getName())); // set the MIME type.
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response.setHeader("Accept-Ranges", "bytes");
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response.addHeader("Content-Length", String.valueOf(contentLength));
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// 第一次请求只返回 content length 来让客户端请求多次实际数据
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os = response.getOutputStream();
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if (range == null) {
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out = new BufferedOutputStream(os);
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response.setHeader("Content-Length", String.valueOf(contentLength));
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raf = new RandomAccessFile(file, "r");
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} else {
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try {
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// 以后的多次以断点续传的方式来返回视频数据
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switch (rangeSwitch) {
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response.setStatus(HttpServletResponse.SC_PARTIAL_CONTENT); // 206
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case 0: { // 普通下载，或者从头开始的下载 同1
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long requestStart = 0, requestEnd = 0;
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String[] ranges = range.split("=");
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if (ranges.length > 1) {
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String[] rangeDatas = ranges[1].split("-");
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requestStart = Long.parseLong(rangeDatas[0]);
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if (rangeDatas.length > 1) {
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requestEnd = Long.parseLong(rangeDatas[1]);
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}
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}
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case 1: { // 针对 bytes=27000- 的请求
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}
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raf.seek(pastLength); // 形如 bytes=969998336- 的客户端请求，跳过 969998336 个字节
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long length = 0;
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int n = 0;
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if (requestEnd > 0) {
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while ((n = raf.read(b, 0, 1024)) != -1) {
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length = requestEnd - requestStart + 1;
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out.write(b, 0, n);
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response.setHeader("Content-Length", String.valueOf(length));
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}
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response.setHeader("Content-Range", "bytes " + requestStart + "-" + requestEnd + "/" + contentLength);
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break;
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} else {
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}
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length = contentLength - requestStart;
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case 2: { // 针对 bytes=27000-39000 的请求
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response.setHeader("Content-Length", String.valueOf(length));
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raf.seek(pastLength); // 形如 bytes=1275856879-1275877358 的客户端请求，找到第 1275856879 个字节
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response.setHeader("Content-Range", "bytes " + requestStart + "-" + (contentLength - 1) + "/" + contentLength);
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int n = 0;
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}
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long readLength = 0; // 记录已读字节数
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}
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while (readLength <= contentLength - 1024) {// 大部分字节在这里读取
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randomFile.seek(start);
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n = raf.read(b, 0, 1024);
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int needSize = requestSize;
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readLength += 1024;
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while (needSize > 0) {
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out.write(b, 0, n);
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byte[] buffer = new byte[1024];
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}
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int len = randomFile.read(buffer);
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if (readLength <= contentLength) { // 余下的不足 1024 个字节在这里读取
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if (needSize < buffer.length) {
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n = raf.read(b, 0, (int) (contentLength - readLength));
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out.write(buffer, 0, needSize);
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out.write(b, 0, n);
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} else {
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}
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out.write(buffer, 0, len);
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break;
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if (len < buffer.length) {
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}
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default: {
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break;
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break;
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}
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}
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}
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}
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out.flush();
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needSize -= buffer.length;
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logger.debug("下载完成！" + file.getAbsolutePath());
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} catch (IOException ie) {
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/**
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* 在写数据的时候， 对于 ClientAbortException 之类的异常，
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* 是因为客户端取消了下载，而服务器端继续向浏览器写入数据时， 抛出这个异常，这个是正常的。
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* 尤其是对于迅雷这种吸血的客户端软件， 明明已经有一个线程在读取 bytes=1275856879-1275877358，
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* 如果短时间内没有读取完毕，迅雷会再启第二个、第三个。。。线程来读取相同的字节段， 直到有一个线程读取完毕，迅雷会 KILL
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* 掉其他正在下载同一字节段的线程， 强行中止字节读出，造成服务器抛 ClientAbortException。
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* 所以，我们忽略这种异常
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*/
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logger.debug("提醒：向客户端传输时出现IO异常，但此异常是允许的，有可能客户端取消了下载，导致此异常，不用关心！");
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}
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}
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} catch (Exception e) {
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out.flush();
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return null;
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} catch (IOException e) {
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logger.debug(e.getMessage(), e);
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logger.debug(e.getMessage(), e);
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} finally {
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return e.getMessage();
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if (out != null) {
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try {
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out.close();
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} catch (IOException e) {
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// logger.error(e.getMessage(), e);
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}
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}
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if (raf != null) {
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try {
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raf.close();
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} catch (IOException e) {
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// logger.error(e.getMessage(), e);
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}
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}
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}
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}
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return null;
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}
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}
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/**
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/**
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