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1.客户端实现

导入http-client jar。

        <dependency>
            <groupId>commons-httpclient</groupId>
            <artifactId>commons-httpclient</artifactId>
            <version>3.1</version>
        </dependency>
public static void clientDemo() {
        try {
            String requestUrl = "http://hello/demo";
            PostMethod postMethod = new PostMethod(requestUrl);

            String data = "json_json_json_json";
            StringRequestEntity stringRequestEntity = new StringRequestEntity(data, "application/x-www-form-urlencoded", "utf-8");
            postMethod.setRequestEntity(stringRequestEntity);

            org.apache.commons.httpclient.HttpClient httpClient = new org.apache.commons.httpclient.HttpClient();

            //调用接口
            int code = httpClient.executeMethod(postMethod);
            String result = postMethod.getResponseBodyAsString();

            System.out.println("接口状态" + code);
            System.out.println("响应" + result);
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
        }
    }

2.服务端实现

@RequestMapping(value = "/receive", method = RequestMethod.POST)
    @ResponseBody
    public String receiveFare(@RequestBody String str) {
        System.out.println("接到数据:" + str);
        return "ok";
    }