「java发送post请求」java发送post请求传文件
今天给各位分享java发送post请求的知识，其中也会对java发送post请求传文件进行解释，如果能碰巧解决你现在面临的问题，别忘了关注本站，现在开始吧！
本文目录一览：
如何使用java发送post请求
/**
* 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=value1name2=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 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 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;
}
java 连续发送post请求
不知道你说的意思是不是这个效果。这个也曾困扰过我。这里提交按钮把表单提交，页面post到后台，在这个表单的另一个button能触发链接到另一个页面（也可以是应用，也是一种post），不知道对你是否有启发。见我代码：
!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" ""
%@page contentType="text/html;charset=utf-8"%
%@page isELIgnored="false" %
%@taglib uri="" prefix="c"%
%request.setCharacterEncoding("gb2312");%
%response.setCharacterEncoding("gb2312");%
html xmlns=""
head
style type="text/css"
body {
background: #FFF;
color: #000;
font: 12px Verdana, Arial, Helvetica, sans-serif;
margin: 0;
padding: 0;
}
a:link, a:visited {
color: #FF2A84;
text-decoration: underline;
}
a:hover, a:active {
color: #FFF;
text-decoration: none;
background: #FF2A84;
}
#navigation {
background: #FFF;
border-bottom: 1px solid #A1A1A1;
margin: 1em 0 0;
padding: 0.6em 0 0;
font-weight: bold;
}
#navigation ul, #navigation ul li {
list-style: none;
margin: 0;
padding: 0;
}
#navigation ul {
padding: 5px 0 5px;
text-align: left;
}
#navigation ul li {
display: inline;
}
#navigation ul li a {
background: url(tableft.gif) no-repeat left top;
color: #FFF;
text-decoration: none;
padding: 5px 0;
}
#navigation ul li span {
background: url(tabright.gif) no-repeat right top;
padding: 5px 7px 5px 3px;
margin: 4px 0 4px 4px;
}
#navigation ul li a:hover span {
text-decoration: underline;
background-position: 100% -75px;
}
#navigation ul li a:hover {
background-position: 0 -75px;
}
#navigation #current a {
background-position: 0 -150px;
}
#navigation #current a span {
background-position: 100% -150px;
}
* html #navigation ul li a {
padding: 0;
}
/style
script type="text/javascript"
function go(){
location.href="/21com/entr_admin_2page.html";
}
/script
/head
body
p align="right"a href="login.jsp" style="text-decoration:none;"退出/a/p
div id="navigation"
ul
liimg src="logo.jpg" width="400px"/img/li
lia href="home.html"span首页/span/a/li
li id="current"a href="/21com/entrance.do"span考勤/span/a/li
lia href="/21com/emplyee.do"span员工/span/a/li
lia href="self.html"span个人设置/span/a/li
/ul
/div
h1font color="red"设置考勤时段/font/h1
form action="/21com/entr_setting.do" method="POSt"
table
tr
td最晚上班时间：/td
tdinput type="text" name="late_time" //td
/tr
tr
td最早下班时间：/td
tdinput type="text" name="early_time" //td
/tr
tr
td每日最少工作时间：/td
tdinput type="text" name="little_time" //td
/tr
tr
td colspan="2"input type="submit" value="提交" /input/td
tdinput type="button" onclick="go()" value="取消"/input/td
/tr
/table
/form
hr/
h4font color="blue"现在考勤时段：/font/h4
table border="1" bordercolor="gray" cellspacing="0" width="80%"
tr bgcolor="gray"
tdfont color="white"b最晚上班时间/b/font/td
tdfont color="white"b最早下班时间/b/font/td
tdfont color="white"b每日最少工作时间/b/font/td
/tr
tr
td${periods.late_time}/td
td${periods.early_time}/td
td${periods.little_time}/td
/tr
/table
/body
/html
如何在java中发送post请求
package com.test;
import java.util.ArrayList;
import java.util.List;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils;
public class D {
public static void main(String[] args){
ListNameValuePair nvps= new ArrayListNameValuePair();
nvps.add(new BasicNameValuePair("id", "1"));
String url="";
HttpClient httpClient = null;
String response="";
try {
HttpPost post = new HttpPost(url);
post.setHeader("Connection", "close");
httpClient = new DefaultHttpClient();
post.setEntity(new UrlEncodedFormEntity(nvps));
HttpResponse httpres= httpClient.execute(post);
if (httpres.getStatusLine().getStatusCode() = 300) {
System.out.println("Request Failed,Code:" + httpres.getStatusLine().getStatusCode() + ",URL:" + url);
}
response = EntityUtils.toString(httpres.getEntity(), "utf-8");
}catch(Exception e){
e.printStackTrace();
}finally{
if(httpClient!=null){
httpClient.getConnectionManager().shutdown();
}
}
System.out.println(response);
}
}
需要httpclient-4.1.3.jar，httpcore-4.1.4.jar和commons-logging-1.1.1.jar
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("");
// 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 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
httpUrlConnection.setRequestMethod("POST");
httpUrlConnection.setRequestProperty("Content-Type","application/json;charset=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);
}
}
}
}
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