Java平台调⽤Python平台已有算法（附源码及解析）
1. 问题描述
Java平台要调⽤Pyhon平台已有的算法，为了减少耦合度，采⽤Pyhon平台提供Restful 接⼝，Java平台负责来调⽤，采⽤Http+Json格式交互。
2. 解决⽅案
2.1 JAVA平台侧
2.1.1 项⽬代码
public static String invokeAlgorithm(String url, HashMap params) throws Exception {
HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.parseMediaType("application/json; charset=UTF-8"));
headers.add("Accept", MediaType.String());
HttpEntity<String> httpEntity = new HttpEntity<>(JSONString(params), headers);
RestTemplate rst = new RestTemplate();
ResponseEntity<String> stringResponseEntity = rst.postForEntity(url, httpEntity, String.class);
Body();
}
2.1.2 代码解析
两个⼊参：url为Python提供restful调⽤⽅法；params参数，项⽬中参数使⽤了map，然后将map转成了Json，与Python服务器约定Json格式传输。
2.2 python平台侧
经过反复调研与深思熟虑的考虑后，决定采⽤flask提供Rest接⼝， flask 是⼀款⾮常流⾏的python web框架，微框架、简洁，社区活跃等。（其实是因为安装的Anaconda⾃带了flask，⼀配置⼀启动好了，就是这么巧）
2.2.1 项⽬代码
# -*- coding: utf-8 -*-
from flask import Flask, request, send_from_directory
from k_means import exec
app = Flask(__name__)
import logging
@ute('/')
def index():
return "Hello, World!"
# k-means算法
@ute('/getKmeansInfoByPost', methods=['POST'])
def getKmeansInfoByPost():
try:
result = _json())
except IndexError as e:
<(str(e))
return 'exception:' + str(e)
except KeyError as e:
<(str(e))
return 'exception:' + str(e)
except ValueError as e:
<(str(e))
return 'exception:' + str(e)
except Exception as e:
<(str(e))
return 'exception:' + str(e)
else:
return result
@ute("/<path:filename>")
def getImages(filename):
return send_from_directory(dirpath, filename, as_attachment=True)
if __name__ == '__main__':
app.run(host="0.0.0.0", port=5000, debug=True)
2.2.2 代码解析
代码为真实项⽬⽰例，去掉了⼀些配置⽽已，⽰例中包含三个⽅法，分别说⼀下java python是什么意思
（1）最基本Rest接⼝：helloword
# -*- coding: utf-8 -*-
from flask import Flask
app = Flask(__name__)
@ute('/')
def index():
return "Hello, World!"
if __name__ == '__main__':
app.run(host="0.0.0.0", port=5000, debug=True)
（2）调⽤其他python⽂件的Rest接⼝
# -*- coding: utf-8 -*-
from flask import Flask, request
from k_means import exec
app = Flask(__name__)
import logging
# k-means算法
@ute('/getKmeansInfoByPost', methods=['POST'])
def getKmeansInfoByPost():
try:
result = _json())
except IndexError as e:
<(str(e))
return 'exception:' + str(e)
except KeyError as e:
<(str(e))
return 'exception:' + str(e)
except ValueError as e:
<(str(e))
return 'exception:' + str(e)
except Exception as e:
<(str(e))
return 'exception:' + str(e)
else:
return result
if __name__ == '__main__':
app.run(host="0.0.0.0", port=5000, debug=True)
说明：1.接收POST⽅法；2. 从request获取java传过来的参数，对应上⾯的java调⽤代码
（3）⽂件下载Rest接⼝
# -*- coding: utf-8 -*-
from flask import Flask, send_from_directory
app = Flask(__name__)
@ute("/<path:filename>")
def getImages(filename):
return send_from_directory(dirpath, filename, as_attachment=True)
if __name__ == '__main__':
app.run(host="0.0.0.0", port=5000, debug=True)
说明：1.还是flask框架提供的：send_from_directory
2.dirpath⽬录，⼀般可以给个固定存放⽬录，调⽤的时候只⽤给⽂件名称就可以直接下载对应⽂件。
2.3 Linux服务器启动python服务
nohup python restapi.py &

版权声明：本站内容均来自互联网，仅供演示用，请勿用于商业和其他非法用途。如果侵犯了您的权益请与我们联系QQ:729038198，我们将在24小时内删除。