* 向指定 URL 发送POST方法的请求
*
* @param url
*发送请求的 URL
* @param param
*请求参数，请求参数应该是 name1=value1&name2=value2 的形式。
* @return 所代表远程资源的响应结果
*/
public static String sendPost(String url, String param) {
PrintWriter out = null
BufferedReader in = null
String result = ""
try {
URL realUrl = new URL(url)
// 打开和URL之间的连接
URLConnection conn = realUrl.openConnection()
// 设置通用的请求属性
conn.setRequestProperty("accept", "*/*")
conn.setRequestProperty("connection", "Keep-Alive")
conn.setRequestProperty("user-agent",
"Mozilla/4.0 (compatibleMSIE 6.0Windows NT 5.1SV1)")
// 发送POST请求必须设置如下两行
conn.setDoOutput(true)
conn.setDoInput(true)
// 获取URLConnection对象对应的输出流
out = new PrintWriter(conn.getOutputStream())
// 发送请求参数
out.print(param)
// flush输出流的缓冲
out.flush()
// 定义BufferedReader输入流来读取URL的响应
in = new BufferedReader(
new InputStreamReader(conn.getInputStream()))
String line
while ((line = in.readLine()) != null) {
result += line
}
} catch (Exception e) {
System.out.println("发送 POST 请求出现异常！"+e)
e.printStackTrace()
}
//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 ex){
ex.printStackTrace()
}
}
return result
}
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，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)
}
}
}
}
