getmethod如何发送json数据

2025-03-14 21:52:55
推荐回答(1个)
回答1:

有时候我们在发送HTTP请求的时候会使用到POST方式,如果是传送普通的表单数据那将很方便,直接将参数到一个Key-value形式的Map中即可。但是如果我们需要传送的参数是Json格式的,会稍微有点麻烦,我们可以使用HttpClient类库提供的功能来实现这个需求。假设我们需要发送的数据是:

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{
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"blog": "http://www.iteblog.com",
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"Author": "iteblog"
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}
我们可以通过JSONObject够着Json:

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JSONObject jsonObject = new JSONObject();
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jsonObject.put("blog", "http://www.iteblog.com");
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jsonObject.put("Author", "iteblog");
如果需要使用Post方式来发送这个数据,我们可以如下实现:

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private HttpMethodBase createMethod(String url, int timeout) {
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PostMethod method = null;
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try {
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method = new PostMethod(url);
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JSONObject jsonObject = new JSONObject();
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jsonObject.put("blog", "http://www.iteblog.com");
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jsonObject.put("Author", "iteblog");
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String transJson = jsonObject.toString();
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RequestEntity se = new StringRequestEntity(transJson, "application/json", "UTF-8");
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method.setRequestEntity(se);
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//使用系统提供的默认的恢复策略
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method.getParams().setParameter(HttpMethodParams.RETRY_HANDLER, new DefaultHttpMethodRetryHandler());
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//设置超时的时间
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method.getParams().setParameter(HttpMethodParams.SO_TIMEOUT, timeout);
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} catch (IllegalArgum www.hbbz08.com entException e) {
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logger.error("非法的URL:{}", url);
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} catch (UnsupportedEncodingException e) {
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e.printStackTrace();
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}
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return method;
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}
  我们通过StringRequestEntity来构造请求实体,在这里,StringRequestEntity将接收三个参数,如下:

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public StringRequestEntity(String content, String contentType, String charset)
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  throws UnsupportedEncodingException
  其中参数content就是我们需要传输的数据;contentType是传送数据的格式,因为我们的数据格式是json的,所以contentType必须填写application/json(更多的contentType可以参见《HTTP Content-Type常用一览表》);charset是字符集编码。

  然后我们再通过HttpClient对象的executeMethod方法来执行:

查看源代码打印帮助
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int statusCode = httpClient.executeMethod(getMethod);
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//只要在获取源码中,服务器返回的不是200代码,则统一认为抓取源码失败,返回null。
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if (statusCode != HttpStatus.SC_OK) {
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logger.error("Method failed: " + getMethod.getStatusLine() + "\tstatusCode: " + statusCode);
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return null;
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}

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