java HttpPost怎么传递参数

public class HttpURLConnectionPost {

/**

* @param args

* @throws IOException

*/

public static void main(String[] args) throws IOException {

readContentFromPost()

}

public static void readContentFromPost() throws IOException {

// Post请求的url，与get不同的是不需要带参数

URL postUrl = new URL("http://www.xxxxxxx.com")

// 打开连接

HttpURLConnection connection = (HttpURLConnection) postUrl.openConnection()   

// 设置是否向connection输出坦消枣，因为这个是post请求，参数要放在

// http正文内，因此需要设为true

connection.setDoOutput(true)

// Read from the connection. Default is true.

connection.setDoInput(true)

// 默认是 GET方式

connection.setRequestMethod("POST")   

// Post 请求不能使桥纤用缓存

connection.setUseCaches(false)

//设置本次连接是否自动重定向

connection.setInstanceFollowRedirects(true)   

// 配置本次连接的Content-type，配置为application/x-www-form-urlencoded的

// 意思是正文是urlencoded编码过的form参数

connection.setRequestProperty("Content-Type","application/x-www-form-urlencoded")

// 连让拆接，从postUrl.openConnection()至此的配置必须要在connect之前完成，

// 要注意的是connection.getOutputStream会隐含的进行connect。

connection.connect()

DataOutputStream out = new DataOutputStream(connection

.getOutputStream())

// 正文，正文内容其实跟get的URL中 '? '后的参数字符串一致

String content = "字段名=" + URLEncoder.encode("字符串值", "编码")

// DataOutputStream.writeBytes将字符串中的16位的unicode字符以8位的字符形式写到流里面

out.writeBytes(content)

//流用完记得关

out.flush()

out.close()

//获取响应

BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()))

String line

while ((line = reader.readLine()) != null){

System.out.println(line)

}

reader.close()

//该干的都干完了,记得把连接断了

connection.disconnect()

}

扩展资料：

关于Java HttpURLConnection使用

public static String sendPostValidate(String serviceUrl, String postData, String userName, String password){

PrintWriter out = null

BufferedReader in = null

String result = ""

try {

log.info("POST接口地址:"+serviceUrl)

URL realUrl = new URL(serviceUrl)

// 打开和URL之间的连接

URLConnection conn = realUrl.openConnection()

HttpURLConnection httpUrlConnection = (HttpURLConnection) conn

// 设置通用的请求属性

httpUrlConnection.setRequestProperty("accept","*/*")

httpUrlConnection.setRequestProperty("connection", "Keep-Alive")

httpUrlConnection.setRequestProperty("user-agent","Mozilla/4.0 (compatibleMSIE 6.0Windows NT 5.1SV1)")

httpUrlConnection.setRequestMethod("POST")

httpUrlConnection.setRequestProperty("Content-Type","application/jsoncharset=UTF-8")

Base64 base64 = new Base64()

String encoded = base64.encodeToString(new String(userName+ ":" +password).getBytes())

httpUrlConnection.setRequestProperty("Authorization", "Basic "+encoded)

// 发送POST请求必须设置如下两行

httpUrlConnection.setDoOutput(true)

httpUrlConnection.setDoInput(true)

// 获取URLConnection对象对应的输出流

out = new PrintWriter(new OutputStreamWriter(httpUrlConnection.getOutputStream(),"utf-8"))

// 发送请求参数

out.print(postData)

out.flush()

// 定义BufferedReader输入流来读取URL的响应

in = new BufferedReader(new InputStreamReader(httpUrlConnection.getInputStream(),"utf-8"))

String line

while ((line = in.readLine()) != null) {

result += line

}

//         

//            if (!"".equals(result)) {

//                BASE64Decoder decoder = new BASE64Decoder()

//                try {

//                    byte[] b = decoder.decodeBuffer(result)

//                    result = new String(b, "utf-8")

//                } catch (Exception e) {

//                    e.printStackTrace()

//                }

//            }

return result

} catch (Exception e) {

log.info("调用异常",e)

throw new RuntimeException(e)

}

//使用finally块来关闭输出流、输入流

finally{

try{

if(out!=null){

out.close()

}

if(in!=null){

in.close()

}

}

catch(IOException e){

log.info("关闭流异常",e)

}

}

}

}

POST方式发送请求示例：

String fullurl = url

//打开连接

URLConnection conn =new URL(fullurl).openConnection()

//设置通用的请求属性

conn.setRequestProperty("accept", "*/*")

conn.setRequestProperty("connection", "Keep-Alive")

conn.setRequestProperty("user-agent", "Mozilla/5.0 (Windows NT 6.1 WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.90 Safari/537.36")

//发送POST请求必须设置下面两行

conn.setDoInput(true)

conn.setDoOutput(true)

try (

//获取URLConnection对象对应的输谨冲改出流

PrintWriter out = new PrintWriter(conn.getOutputStream())) {

out.print(parm)//发送祥判请求判历参数(key1=value1&key2=value2)

out.flush()//flush输出流的缓冲

} catch (Exception e) {}

//获取响应头字段

Map<String, List<String>> map = conn.getHeaderFields()

//根据输入流读取响应数据

InputStream is = conn.getInputStream()

仅供参考。

private void postMethod(String url) throws IOException

 {     

  url = "http://www.newsmth.net/bbslogin2.php"

  PostMethod postMethod = new PostMethod(url)

  // 填入各个表单域的值

  NameValuePair[] data = { new NameValuePair("id", "herrapfel"),new NameValuePair("passwd", "") }

  // 将表单的值放入postMethod中

  postMethod.setRequestBody(data)

  // 执行postMethod

  int statusCode = httpClient.executeMethod(postMethod)

  System.out.println(" status code:" + statusCode)

  // HttpClient对于要求接受后继服务的请求，象POST和PUT等不能自动处理转发

 

if(statusCode == HttpStatus.SC_OK)

  {

   StringBuffer contentBuffer = new StringBuffer()

   InputStream in = postMethod.getResponseBodyAsStream()

            BufferedReader reader = new BufferedReader(new InputStreamReader(in,postMethod.getResponseCharSet()))

            String inputLine = null

            while((inputLine = reader.readLine()) != null)

            {

    没弊         contentBuffer.append(inputLine)

             System.out.println("input line:"+ inputLine)

             缓察迅contentBuffer.append("/n")

            }

            in.close()

  }

  else if (statusCode == HttpStatus.SC_MOVED_PERMANENTLY || statusCode == HttpStatus.SC_MOVED_TEMPORARILY) 

  {

      扰此// 从头中取出转向的地址

      Header locationHeader = postMethod.getResponseHeader("location")

      String location = null

      if (locationHeader != null) 

      {

       location = locationHeader.getValue()

       System.out.println("The page was redirected to:" + location)

      } 

      else 

      {

       System.err.println("Location field value is null.")

      }

  }

 

 

 

 }

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