DefaultHttpClient

最新推荐文章于 2021-08-28 13:59:05 发布

Elena_wang

最新推荐文章于 2021-08-28 13:59:05 发布

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本文提供了一个使用Java的HTTP客户端发送POST请求的例子，并展示了如何通过设置请求头和参数来获取响应内容。

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转自：http://username2.iteye.com/blog/1664995

public static String method1() throws Exception {

   DefaultHttpClient httpclient = new DefaultHttpClient();
//     // 代理的设置
//      HttpHost proxy = new HttpHost("10.60.8.20", 8080);
//      httpclient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY, proxy);

    // 目标地址
     HttpPost httppost = new HttpPost("http://localhost/user/user_saveUser.action");
     System.out.println("请求: " + httppost.getRequestLine());

//     // 构造最简单的字符串数据
//      StringEntity reqEntity = new StringEntity("username=test&password=test");
//     // 设置类型
//      reqEntity.setContentType("application/x-www-form-urlencoded");
//     // 设置请求的数据
//      httppost.setEntity(reqEntity);

     //post 参数传递
     List<BasicNameValuePair>   nvps = new ArrayList<BasicNameValuePair>();
     nvps.add(new BasicNameValuePair("content", lectureContent ));    //参数
     nvps.add(new BasicNameValuePair("path", "D:/file"));    //参数
     nvps.add(new BasicNameValuePair("name", "8"));    //参数
     nvps.add(new BasicNameValuePair("age", "9"));    //参数
     nvps.add(new BasicNameValuePair("username", "wzt"));    //参数

     httppost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));   //设置参数给Post

    // 执行
     HttpResponse response = httpclient.execute(httppost);
     HttpEntity entity = response.getEntity();
     System.out.println("----------------------------------------");
     System.out.println(response.getStatusLine());
    if (entity != null) {
       System.out.println("Response content length: " + entity.getContentLength());
     }
    // 显示结果
     BufferedReader reader = new BufferedReader(new InputStreamReader(entity.getContent(), "UTF-8"));

     String line = null;
    while ((line = reader.readLine()) != null) {
       System.out.println(line);
     }
    if (entity != null) {
       entity.consumeContent();
     }
    return null;

}

/** 模拟url访问
* 从特定的url中获取json
* @param urlStr
* @param params
* @return
* json object ,or null if failed
*/
private static JSONObject getJsonFromUrl(String urlStr,
Map<String, String> params) {
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(urlStr);
JSONObject json = null;
try {
if (params != null) {
Iterator<String> keys = params.keySet().iterator();
List<NameValuePair> nvps = new ArrayList<NameValuePair>();
while (keys.hasNext()) {
String key = keys.next();
nvps.add(new BasicNameValuePair(key, params.get(key)));
}
httpPost.setEntity(new UrlEncodedFormEntity(nvps, HTTP.UTF_8));
}
HttpResponse response = httpClient.execute(httpPost);
HttpEntity entity = response.getEntity();
InputStream is = entity.getContent();
byte[] bytes = new byte[256];
StringBuffer sb = new StringBuffer();
while (is.read(bytes) > 0) {
sb.append(new String(bytes));
bytes = new byte[256];
}
json = JSONObject.fromObject(sb.toString());
} catch (Exception e) {
log.error("http client execute error:" + e.getMessage(), e);
}

return json;
}