[一]浏览器form表单提交
表单提交， 适用于浏览器提交。像常见的pc端的网银支付，用户在商户商城购买商品，支付时商家系统把交易数据通过form表单提交到三方支付网关，然后用户在三方网关页面完成支付。
下面是一个form表单自动提交案例，将这段html输出到浏览器，会自动提交到目标action。
<form name="payForm" action='http://192.168.40.228:28080/app/userIdentify.do' method='POST' >
<input type='hidden' name='version' value='B2C1.0'>
<input type='hidden' name='tranData' value='PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iR0JLIj8+PEIyQ1JlcT48Y2FyZE5vPjE8L2NhcmRObz48Y3VzdG9tZXJOYW1lPkpvaG48L2N1c3RvbWVyTmFtZT48b3JkZXJObz5mZjYxYTk5OC0yN2I0LTQ1YzctOWE0Yi0yYmNlY2ZkNmJmN2E8L29yZGVyTm8+PGNlcnRObz4xMzA0MzQxOTgzMDEwNjc1MTE8L2NlcnRObz48dHJhblR5cGU+MTwvdHJhblR5cGU+PGJhbmtJZD4wPC9iYW5rSWQ+PG1vYmlsZT4xPC9tb2JpbGU+PC9CMkNSZXE+'>
<input type='hidden' name='signData' value='c3c50a27dac38c123c4be418b2273049'>
<input type='hidden' name='merchantId' value='M100001564'>
<input type='submit' value='提交' />
<script>document.forms['payForm'].submit();</script>
</form>
[二]服务端httppost
另一种是服务端点对点的http协议的post请求，此方式适用于api接口调用。将请求数据以querystring的格式（a=val1&b=val2&c=val3&...）作为参数传（提）输（交）给服务端。此时注意要把Request的Content-Type设置为application/x-www-form-urlencoded。如下是一个工具方法：
import java.io.BufferedReader;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.URL; /**
*
* HTTP协议POST请求方法
*/
public static String httpMethodPost(String url, String params, String gb) {
if (null == gb || "".equals(gb)) {
gb = "UTF-8";
}
StringBuffer sb = new StringBuffer();
URL urls;
HttpURLConnection uc = null;
BufferedReader in = null;
try {
urls = new URL(url);
uc = (HttpURLConnection) urls.openConnection();
uc.setRequestMethod("POST");
uc.setDoOutput(true);
uc.setDoInput(true);
uc.setUseCaches(false);
uc.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
uc.connect();
if(!StringUtils.isBlank(params)){
DataOutputStream out = new DataOutputStream(uc.getOutputStream());
out.write(params.getBytes(gb));
out.flush();
out.close();
}
in = new BufferedReader(new InputStreamReader(uc.getInputStream(),
gb));
String readLine = "";
while ((readLine = in.readLine()) != null) {
sb.append(readLine);
}
if (in != null) {
in.close();
}
} catch (IOException e) {
log.error(e.getMessage(), e);
} finally {
if (uc != null) {
uc.disconnect();
}
}
return sb.toString();
}
调用方式：
String url = "http://192.168.40.228:28080/app/userIdentify.do";
String param = String.format("version=%s&tranData=%s&signData=%s&merchantId=%s", version, URLEncoder.encode(tranDataBase64, "GBK"), signData, merchantId);
String responseStr = HttpUtil.httpMethodPost(url, param, "GBK");
[三]服务端httppost的另一种实现
另一种是针对于util方法暴露的参数是Map的场景：
import org.apache.http.HttpEntity;
import org.apache.http.NameValuePair;
import org.apache.http.StatusLine;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.util.EntityUtils; import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map; public final class HttpUtil { public static String httpMethodPost(String url, Map<String, String> paramMap) {
CloseableHttpClient httpClient = HttpClients.createDefault();
boolean var3 = true; byte result;
try {
HttpPost post = new HttpPost(url);
UrlEncodedFormEntity uefEntity = null;
List<NameValuePair> list = new ArrayList();
if (null != paramMap) {
Iterator var7 = paramMap.entrySet().iterator(); while (var7.hasNext()) {
Map.Entry<String, String> entity = (Map.Entry) var7.next();
list.add(new BasicNameValuePair((String) entity.getKey(), (String) entity.getValue()));
} uefEntity = new UrlEncodedFormEntity(list, "UTF-8");
post.setEntity(uefEntity);
} System.out.println("POST 请求...." + post.getURI());
CloseableHttpResponse httpResponse = httpClient.execute(post);
StatusLine statusLine = httpResponse.getStatusLine();
System.out.println(statusLine); try {
HttpEntity entity = httpResponse.getEntity();
if (entity != null) {
return EntityUtils.toString(entity, "UTF-8");
}
} finally {
httpResponse.close();
} } catch (Exception var25) {
var25.printStackTrace();
} finally {
try {
if (httpClient != null) {
httpClient.close();
}
} catch (Exception var23) {
var23.printStackTrace();
}
} return null;
}
}
[三]服务端参数获取方式
ServletRequest对象的如下方法：
ServletInputStream getInputStream() throws IOException;
String getParameter(String var1);
Enumeration getParameterNames();
String[] getParameterValues(String var1);
Map getParameterMap();
结束
▄︻┻┳═一tomcat与jetty接收请求参数的区别
▄︻┻┳═一比较两种方式的form请求提交
▄︻┻┳═一Post方式的Http流请求调用