javaurlpost

⑴ 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，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();

}

(1)javaurlpost扩展阅读：

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);

}

}

}

}

⑵ java二次请求URL 我第一次请求post 传入用户名密码 得到了返回的cookies，请求数据返回，但是我要请求

cookie 放到下次请求的头，再去请求就是了

~~~~~~

⑶ 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=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 (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;
}

⑷ Java请求一个URL。获取网站返回的数据。通过POST请求

packagewzh.Http;

importjava.io.BufferedReader;
importjava.io.IOException;
importjava.io.InputStreamReader;
importjava.io.PrintWriter;
importjava.net.URL;
importjava.net.URLConnection;
importjava.util.List;
importjava.util.Map;

publicclassHttpRequest{
/**
*向指定URL发送GET方法的请求
*
*@paramurl
*发送请求的URL
*@paramparam
*请求参数，请求参数应该是name1=value1&name2=value2的形式。
*@returnURL所代表远程资源的响应结果
*/
publicstaticStringsendGet(Stringurl,Stringparam){
Stringresult="";
BufferedReaderin=null;
try{
StringurlNameString=url+"?"+param;
URLrealUrl=newURL(urlNameString);
//打开和URL之间的连接
URLConnectionconnection=realUrl.openConnection();
//设置通用的请求属性
connection.setRequestProperty("accept","*/*");
connection.setRequestProperty("connection","Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0(compatible;MSIE6.0;WindowsNT5.1;SV1)");
//建立实际的连接
connection.connect();
//获取所有响应头字段
Map<String,List<String>>map=connection.getHeaderFields();
//遍历所有的响应头字段
for(Stringkey:map.keySet()){
System.out.println(key+"--->"+map.get(key));
}
//定义BufferedReader输入流来读取URL的响应
in=newBufferedReader(newInputStreamReader(
connection.getInputStream()));
Stringline;
while((line=in.readLine())!=null){
result+=line;
}
}catch(Exceptione){
System.out.println("发送GET请求出现异常！"+e);
e.printStackTrace();
}
//使用finally块来关闭输入流
finally{
try{
if(in!=null){
in.close();
}
}catch(Exceptione2){
e2.printStackTrace();
}
}
returnresult;
}

/**
*向指定URL发送POST方法的请求
*
*@paramurl
*发送请求的URL
*@paramparam
*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
*/
publicstaticStringsendPost(Stringurl,Stringparam){
PrintWriterout=null;
BufferedReaderin=null;
Stringresult="";
try{
URLrealUrl=newURL(url);
//打开和URL之间的连接
URLConnectionconn=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;MSIE6.0;WindowsNT5.1;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=newPrintWriter(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=newBufferedReader(
newInputStreamReader(conn.getInputStream()));
Stringline;
while((line=in.readLine())!=null){
result+=line;
}
}catch(Exceptione){
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(IOExceptionex){
ex.printStackTrace();
}
}
returnresult;
}
}
//函数调用时填入URL和参数（参数非必须）就可以获取返回的数据，发送post请求调用示例
Stringresult=HttpRequest.sendPost("http://api.map..com/telematics/v3/weather?location=%E5%8C%97%E4%BA%AC&output=json&ak=","")

⑸ java，post发送请求给url，服务器处理结束后会反回我处理结果，写一个接

到底是要写客户端、还是服务器端的呢。。。。。。。。

服务器端，TOMCAT写servlet就可以

客户端，就是java.net.HttpURLConnection

⑹ java post-JAVA HTTP POST请求Url过长会出现什么问题

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
if (headers != null) {

for (String key : headers.keySet()) {
httpPost.setHeader(key, headers.get(key));
}
}

⑺ 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){
List<NameValuePair> nvps= new ArrayList<NameValuePair>();
nvps.add(new BasicNameValuePair("id", "1"));
String url="https://www.hao123.com/";

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

⑻ 求助，Java HttpUrlConnection POST请求

package wzq.j2se;
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 java.net.URLEncoder;
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);

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，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 = "account=" + URLEncoder.encode("一个大肥人", "UTF-8");
content +="&pswd="+URLEncoder.encode("两个个大肥人", "UTF-8");;
// DataOutputStream.writeBytes将字符串中的16位的unicode字符以8位的字符形式写到流里面
out.writeBytes(content);
out.flush();
out.close();

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

while ((line = reader.readLine()) != null){
System.out.println(line);
}

reader.close();
connection.disconnect();
}
}

⑼ 如何使用java模拟post请求

两种选择：一、使用httpclient，二使用java自带的类库。
1、java自带类库：

public static String call(String address,String params) {

URL url = null;

HttpURLConnection httpurlconnection = null;

StringBuilder result = new StringBuilder();

try {

url = new URL(address);

// 以post方式请求

httpurlconnection = (HttpURLConnection) url.openConnection();

httpurlconnection.setDoOutput(true);

httpurlconnection.setRequestMethod("POST");

if(null!=params&¶ms.length()>0){

httpurlconnection.getOutputStream().write(params.getBytes());

httpurlconnection.getOutputStream().flush();

httpurlconnection.getOutputStream().close();

}

// 获取页面内容

java.io.InputStream in = httpurlconnection.getInputStream();

java.io.BufferedReader breader = new BufferedReader(new InputStreamReader(in, Config.DEFAULT_CHARSET));

String str = breader.readLine();

while (str != null) {

result.append(str);

str = breader.readLine();

}

breader.close();

in.close();

} catch (Exception e) {

} finally {

if (httpurlconnection != null)

httpurlconnection.disconnect();

}

return result.toString().trim();

}

2、httpclient：

public static String post(String url,String params){
HttpClient httpClient = new DefaultHttpClient();

StringBuilder builder = new StringBuilder();

HttpPost post = new HttpPost(url);

try {

if(null!=params){

post.setEntity(new StringEntity(params,"UTF-8"));

}

HttpResponse resp = httpClient.execute(post);

int statusCode = resp.getStatusLine().getStatusCode();

if(statusCode<=304){

HttpEntity entity = resp.getEntity();

if (entity == null) {

throw new IllegalArgumentException("HTTP entity may not be null");

}

if (entity.getContentLength() > Integer.MAX_VALUE) {

throw new IllegalArgumentException("HTTP entity too large to be buffered in memory");

}

int i = (int)entity.getContentLength();

i = i<0 ? 4096 : i;

final InputStream instream = entity.getContent();

final Reader reader = new InputStreamReader(instream, Config.DEFAULT_CHARSET);

final CharArrayBuffer buffer = new CharArrayBuffer(i);

final char[] tmp = new char[1024];

int l;

while((l = reader.read(tmp)) != -1) {

buffer.append(tmp, 0, l);

}

builder.append(buffer);

}

post.abort();

} catch (Exception e) {

post.abort();

}

return builder.toString().trim();

}