httpclientpostjava

❶ 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;

❷ 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();

}

(2)httpclientpostjava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);

}

}

}

}

❸ javahttpclient post请求 x-forwarded-for这个可以设置成其他ip么

目前，要为另一个项目提供接口，接口是用HTTP URL实现的，最初的想法是另一个项目用jQuery post进行请求。
但是，很可能另一个项目是部署在别的机器上，那么就存在跨域问题，而jquery的post请求是不允许跨域的。
这时，就只能够用HttpClient包进行请求了，同时由于请求的URL是HTTPS的，为了避免需要证书，所以用一个类继承DefaultHttpClient类，忽略校验过程。
写一个SSLClient类，继承至HttpClient。

❹ java HttpPost传入参数中文乱码

以上的2个方法最好都要用上 过滤器只能解决POST请求 ，要处理GET请求就要用
bytes = string.getBytes("iso-8859-1") 得到原始的字节串，再用 string = new String(bytes, "GB2312") 重新得到正确的字符串 。
这个方法，所以最好2个都要写，这样不管是POST还是GET请求就都能解决了。

❺ 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();

}