Q:

Why I have different results for python and java base64 encode for the same text?

I have two codes in python and java as following, but run them to different results, what happened?
python2.7 code：
#encoding:utf-8
import json
import base64

st_test = {"test":"测试内容"}
body = json.dumps(st_test,ensure_ascii=False)
res = base64.b64encode(body)
prin res 
#eyJ0ZXN0IjogIua1i+ivleWGheWuuSJ9

Java code:
import java.util.Base64;

body = "{\"test\":\"测试内容\"}";
String body64 = Base64.getEncoder().encodeToString(body.getBytes("UTF-8")) ;
System.out.println(body64);
//eyJ0ZXN0Ijoi5rWL6K+V5YaF5a65In0=

A:

You have two different strings - Java doesn't have space after :
If I remove space 
body = body.replace(' ', '')

then I get the same code

import json
import base64

st_test = {"test": "测试内容"}
body = json.dumps(st_test, ensure_ascii=False)
print body

body = body.replace(' ', '')
print body

res = base64.b64encode(body)
print res
print (res == 'eyJ0ZXN0Ijoi5rWL6K+V5YaF5a65In0=')

Result
{"test": "测试内容"}
{"test":"测试内容"}
eyJ0ZXN0Ijoi5rWL6K+V5YaF5a65In0=
True

