UrlEncodedFormEntity和StringEntity：HttpPost 两种消息体形式

桃扇骨 2022-04-15 05:27 221阅读 0赞

**一、UrlEncodedFormEntity**

代码示例：

//设置请求方式与参数
    URI uri = new URI(uriStr);
    HttpPost httpPost = new HttpPost(uri);
    httpPost.getParams().setParameter("http.socket.timeout", new Integer(500000));
    httpPost.setHeader("Content-type", "text/plain; charset=UTF-8");
    httpPost.setHeader("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows 2000)");
    httpPost.setHeader("IConnection", "close");
    
    List<NameValuePair> nvps = new ArrayList<NameValuePair>();
    nvps.add(new BasicNameValuePair("KEY1", "VALUE1"));
    //...
    httpPost.setEntity(new UrlEncodedFormEntity(nvps));
    
    //执行请求
    HttpClient httpclient = new DefaultHttpClient();
    httpclient.getParams().setParameter("Content-Encoding", "UTF-8");
    HttpResponse response = httpclient.execute(httpPost);
    
    //获取返回
    HttpEntity entity = response.getEntity();
    BufferedReader in = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));
    StringBuffer buffer = new StringBuffer();
    String line = null;
    while ((line = in.readLine()) != null) {
      buffer.append(line);
    }
    return buffer.toString();

使用 UrlEncodedFormEntity 来设置 body，消息体内容类似于“KEY1=VALUE1&KEY2=VALUE2&...”这种形式，服务端接收以后也要依据这种协议形式做处理。

**二、StringEntity**  
有时候我们不想使用上述格式来传值，而是想使用json格式来设置body，就可以使用这个类的实例。

代码示例：

JSONObject jsonObject = new JSONObject();
    jsonObject.put("KEY1", "VALUE1");
    jsonObject.put("KEY2", "VALUE2");
    httpPost.setEntity(new StringEntity(jsonObject.toString()));

其实，采用 StringEntity 就是形式比较自由了，除了json，你也可以使用其它任意的字符串，只要服务端能做相应处理即可。

原文链接：[https://my.oschina.net/xuleo/blog/1491669][https_my.oschina.net_xuleo_blog_1491669]

[https_my.oschina.net_xuleo_blog_1491669]: https://my.oschina.net/xuleo/blog/1491669