spring boot 下载文件出错 org.apache.http.ConnectionClosedException: Premature end of Content-Length delimi

坚强一点 2020-11-13 00:49:45
spring 下载 文件 boot 载文


下载一个大文件(100M左右)报错,

org.apache.http.ConnectionClosedException: Premature end of Content-Length delimited message body (expected: 103767; received: 95040

百度 google 了很久尝试了很多办法,比如增加 http 链接的超时时间,增加缓冲区等都没有解决

最后发现,是我代码写错了

错误代码如下 本例中的伪代码没有输入输出流的关闭流程,实际代码中需要注意

 

 
public ZipOutputStream test(String zifDir,List<ZipFileItem> items) throws Exception{
String filePath = zifDir + UUID.randomUUID().toString()+".zip";
FileOutputStream fileOutputStream = new FileOutputStream(filePath);
ZipOutputStream zip = new ZipOutputStream(fileOutputStream);
int temp = -1;
for (ZipFileItem item : items) {
try {
ZipEntry entry = new ZipEntry(item.getName());
zip.putNextEntry(entry);
while((temp = item.getIs().read()) != -1){ // 主要错误在这里
zip.write(temp);
}
item.getIs().close();
}catch (Exception e){
e.printStackTrace();
}
}
return zip;
}

其实代码本身没有错误,主要问题是这里我是一个字节一个字节的读取,并且写入输入流中,一旦文件过大,导致写入速度太慢,即使宽度足够,下载速度也不会超过1M/s,并且会报以上错误。

修改后代码:

 

public ZipOutputStream test(String zifDir,List<ZipFileItem> items) throws Exception{
String filePath = zifDir + UUID.randomUUID().toString()+".zip";
FileOutputStream fileOutputStream = new FileOutputStream(filePath);
ZipOutputStream zip = new ZipOutputStream(fileOutputStream);
byte [] bytes = new [1024]; //
for (ZipFileItem item : items) {
try {
ZipEntry entry = new ZipEntry(item.getName());
zip.putNextEntry(entry);
while((item.getIs().read(bytes)) != -1){
zip.write(bytes); // 这里有bug
}
item.getIs().close();
}catch (Exception e){
e.printStackTrace();
}
}
return zip;
}

一次读取 1024 字节,并且写入输入流,极大的提高了速度,并且下载速度也能提高到 4-5 M/S (宽度速度足够的情况下)

但是这里还有一个问题,我下载的内容是图片,下载下来的图片全都不能用,显示不全,部分内容丢失。

主要问题是在写入的时候也是一次性写入 1024 字节内容,不管读取了多少,所以当一个文件的大小不是正好 1024 的整数倍的时候。就会出现以上问题。

最后修改代码为:

 

public ZipOutputStream test(String zifDir,List<ZipFileItem> items) throws Exception{
String filePath = zifDir + UUID.randomUUID().toString()+".zip";
FileOutputStream fileOutputStream = new FileOutputStream(filePath);
ZipOutputStream zip = new ZipOutputStream(fileOutputStream);
int readCount = -1;
byte [] bytes = new [1024]; //
for (ZipFileItem item : items) {
try {
ZipEntry entry = new ZipEntry(item.getName());
zip.putNextEntry(entry);
while((readCount = item.getIs().read(bytes)) != -1){
zip.write(bytes,0,readCount); // 写入所有读取到的内容长度。
}
item.getIs().close();
}catch (Exception e){
e.printStackTrace();
}
}
return zip;
}

最后,记录每次读取的长度,在写入时写入特定长度的字节,不多写,也不少写,解决问题。

 

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版权声明
本文为[坚强一点]所创,转载请带上原文链接,感谢
https://blog.csdn.net/wab719591157/article/details/80175635

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