HttpURLConnection post提交实例

import java.io.BufferedReader;

import java.io.DataOutputStream;

import java.io.IOException;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.URL;

import cn.kungho.util.KHRSA;

public class HttpInvoker{

public static final String POST_URL = "http://192.168.0.208:8006/SPSServlet";

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(POST_URL);

// 打开连接

HttpURLConnection connection = (HttpURLConnection) postUrl.openConnection();

// Output to the connection. Default is

// false, set to true because post

// method must write something to the

// connection

// 设置是否向connection输出，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);

// Set the post method. Default is GET

connection.setRequestMethod("POST");

// Post cannot use caches

// Post 请求不能使用缓存

connection.setUseCaches(false);

// This method takes effects to

// every instances of this class.

// URLConnection.setFollowRedirects是static函数，作用于所有的URLConnection对象。

// connection.setFollowRedirects(true);

// This methods only

// takes effacts to this

// instance.

// URLConnection.setInstanceFollowRedirects是成员函数，仅作用于当前函数

connection.setInstanceFollowRedirects(true);

// Set the content type to urlencoded,

// because we will write

// some URL-encoded content to the

// connection. Settings above must be set before connect!

// 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，下面我们可以看到我们对正文内容使用URLEncoder.encode

// 进行编码

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

// 连接，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());

// The URL-encoded contend

// 正文，正文内容其实跟get的URL中'?'后的参数字符串一致

// String content = "firstname=" + URLEncoder.encode("一个大肥人", "utf-8");

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

// byte[] content = "KS000000GW67D3RGVP57|F4-6D-04-E8-F3-5A".getBytes();

byte[] content = KHRSA.KHPublicEncrypt("KC000000H089UY626JUL|F4-6D-04-E8-F3-5A".getBytes());

System.out.println("----------------- content size is : " + content.length);

out.write(content);

out.flush();

out.close(); // flush and close

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

String line;

System.out.println("=============================");

System.out.println("Contents of post request");

System.out.println("=============================");

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

System.out.println(line);

}

System.out.println("=============================");

System.out.println("Contents of post request ends");

System.out.println("=============================");

reader.close();

connection.disconnect();

}

/** *//**

* @param args

*/

public static void main(String[] args) {

// TODO Auto-generated method stub

try {

readContentFromPost();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

}