Spring boot download file error org.apache.http .ConnectionClosedException: Premature end of Content-Length delimi

Be strong 2020-11-13 00:49:45
spring boot download file error


Download a big file (100M about ) Report errors ,

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

Baidu google It's been a long time, a lot of ways , For example, increase http The timeout for the link , Adding buffers and so on didn't solve the problem

Finally found , Is my The code is wrong

The error code is as follows   The pseudo code in this example does not have an I / O flow to close , The actual code needs to pay attention to

 

 
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){ // The main mistake is here
zip.write(temp);
}
item.getIs().close();
}catch (Exception e){
e.printStackTrace();
}
}
return zip;
}

There is no error in the code itself , The main problem here is that I read byte by byte , And write it to the input stream , Once the file is too large , Causes the writing speed to be too slow , Even if it's wide enough , Download speed will not exceed 1M/s, And will report the above mistakes .

Modified code :

 

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); // Here you are bug
}
item.getIs().close();
}catch (Exception e){
e.printStackTrace();
}
}
return zip;
}

Read once 1024 byte , And write to the input stream , Greatly increased the speed , And the download speed can also be increased to 4-5 M/S ( If the width and speed are enough )

But there is a problem , The content I downloaded is pictures , None of the downloaded images can be used , Display incomplete , Part of the content is missing .

The main problem is that when you write, you write once 1024 Byte content , No matter how much you read , So when a file is not the right size 1024 When it's an integral multiple of . The above problems will occur .

Finally, modify the code to :

 

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); // Write the length of all read contents .
}
item.getIs().close();
}catch (Exception e){
e.printStackTrace();
}
}
return zip;
}

Last , Record the length of each read , Write a specific length of bytes when writing , Not much , And a lot of them write about , solve the problem .

 

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