post请求java
⑴ 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();
}
⑵ Java sendPost请求方法如何加入参数
/**
* 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;
}
⑶ 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();
}
(3)post请求java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);
}
}
}
}
⑷ 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;
}
⑸ 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
⑹ JAVA中Get和Post请求的区别收集整理
Get：是以实体的方式得到由请求URI所指定资源的信息，如果请求URI只是一个数据产生过程，那么最终要在响应实体中返回的是处理过程的结果所指向的资源，而不是处理过程的描述。
Post：用来向目的服务器发出请求，要求它接受被附在请求后的实体，并把它当作请求队列中请求URI所指定资源的附加新子项，Post被设计成用统一的方法实现下列功能：
1：对现有资源的解释
2：向电子公告栏、新闻组、邮件列表或类似讨论组发信息。
3：提交数据块
4：通过附加操作来扩展数据库
从上面描述可以看出，Get是向服务器发索取数据的一种请求；而Post是向服务器提交数据的一种请求，要提交的数据位于信息头后面的实体中。
⑺ java调用post请求到localhost:4040
打包成jar就别用localhost了，改成服务器的ip地址
⑻ java post请求相关
需要什么请求什么就可以,登录认证信息是放在session中的,看你是用什么安全认证框架,还是手写filter判断用户是否认证通过,然后返回对应的资源,没通过认证就跳到登录
⑼ 怎么使用java模拟post请求
你要导入httpclient的jar包，要是你请求参数格式是json的或者返回的是json格式数据，你还需要导入json包
/**
* post请求
* @param url url地址
* @param jsonParam 参数
* @param noNeedResponse 不需要返回结果
* @return
*/
public static JSONObject httpPost(String url,JSONObject jsonParam, boolean noNeedResponse){
//post请求返回结果
DefaultHttpClient httpClient = new DefaultHttpClient();
JSONObject jsonResult = null;