本文目录一览：

1、怎么用java 发送http报文 2、java怎么主动发送http请求 3、如何使用java http发送请求 4、java 怎么发送一个http请求

怎么用java 发送http报文

URL url = null;
HttpURLConnection httpurlconnection = null;
try {
    url = new URL("");
    // 以post方式请求
    httpurlconnection = (HttpURLConnection) url.openConnection();
    httpurlconnection.setConnectTimeout(6000);
    httpurlconnection.setReadTimeout(6000);
    httpurlconnection.setDoOutput(true);
    httpurlconnection.setRequestMethod("POST");
    msg=java.net.URLEncoder.encode(msg,"utf-8");
    String username = "UserName=userPassword=pwdSrcNumber=1065DestTermID="
    + dest+ "MsgContent=" + msg;
    httpurlconnection.getOutputStream().write(
    username.getBytes("utf-8"));
    httpurlconnection.getOutputStream().flush();
    httpurlconnection.getOutputStream().close();
    // 获取响应代码
    code = httpurlconnection.getResponseCode();
    // 获取页面内容
    java.io.InputStream in = httpurlconnection.getInputStream();
    java.io.BufferedReader breader = new BufferedReader(
    new InputStreamReader(in, "gb2312"));
    String str = breader.readLine();
    while (str != null) {
        resp+=str;
        str= breader.readLine();
    }
} catch (Exception e) {
    resp="err";
} finally {
    if (httpurlconnection != null)
        httpurlconnection.disconnect();
}

java怎么主动发送http请求

实现思路就是先定义请求头内容，之后进行请求头设置。 定义请求头

LinkedHashMap<String,String> headers = new LinkedHashMap<String,String>();
headers.put("Content-type","text/xml");
headers.put("Cache-Control", "no-cache");
headers.put("Connection", "close");

给HttpPost 设置请求头

HttpPost httpPost = new HttpPost("地址");
if (headers != null) {
    for (String key : headers.keySet()) {
        httpPost.setHeader(key, headers.get(key));
    }
}

备注：只需要在map中设置相应的请求头内容即可。根据实际需要修改即可

如何使用java http发送请求

HttpURLConnection mHttpURLConnection = null;
URL mUrl = null;
InputStream inputStream = null;
try {
    String url = UrlEncode(mFileType.getStrUrl(), "UTF-8");
    mUrl = new URL(url);
    mHttpURLConnection = (HttpURLConnection) mUrl.openConnection();
    mHttpURLConnection.setAllowUserInteraction(true);
    mHttpURLConnection.setRequestMethod("GET");
    mHttpURLConnection.setRequestProperty("Range", "bytes=" + startPos + "-" + endPos);
    mHttpURLConnection.setRequestProperty("Connection", "Keep-Alive");
    int responseCode = mHttpURLConnection.getResponseCode();
    long length = mHttpURLConnection.getContentLength();
    // 判断请求是否成功处理
    if (responseCode == HttpStatus.SC_OK || responseCode == HttpStatus.SC_PARTIAL_CONTENT) {
        inputStream = mHttpURLConnection.getInputStream();
    }
} catch (Exception e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
}

java 怎么发送一个http请求

这里有整套的Java发送HTTP请求的代码，包括Post、Get、Delete、Put、Trace、Head、Options请求方法，链接如下： 然后线上实力Demo：