Java中的HTTP Json请求？ [英] HTTP Json requests in Java?

问题描述

如何用Java生成HTTP Json请求？任何图书馆？在HTTP Json请求下，我的意思是使用Json对象作为数据进行POST，并将结果作为Json接收。

How to make HTTP Json requests in Java? Any library? Under "HTTP Json request" I mean make POST with Json object as data and recieve result as Json.

推荐答案

超出HTTP请求本身 - 即使只使用 java.net.URL.openConnection 也可以完成 - 你只需要一个JSON库。为方便与POJO的绑定，我建议 Jackson 。

Beyond doing HTTP request itself -- which can be done even just by using java.net.URL.openConnection -- you just need a JSON library. For convenient binding to/from POJOs I would recommend Jackson.

所以类似于：

// First open URL connection (using JDK; similar with other libs)
URL url = new URL("http://somesite.com/requestEndPoint");
URLConnection connection = url.openConnection();
connection.setDoInput(true);  
connection.setDoOutput(true);  
// and other configuration if you want, timeouts etc
// then send JSON request
RequestObject request = ...; // POJO with getters or public fields
ObjectMapper mapper = new ObjectMapper(); // from org.codeahaus.jackson.map
mapper.writeValue(connection.getOutputStream(), request);
// and read response
ResponseObject response = mapper.readValue(connection.getInputStream(), ResponseObject.class);

（显然有更好的错误检查等）。

(obviously with better error checking etc).

使用现有的rest-client库有更好的方法可以做到这一点;但是在低级别，它只是HTTP连接处理和数据绑定到JSON的问题。

There are better ways to do this using existing rest-client libraries; but at low-level it's just question of HTTP connection handling, and data binding to/from JSON.

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