Jfinal 获取post请求中的body内容(流的形式获取)，Java 发送post 流
发布时间：2018-06-01作者：laosun阅读（8820）
Jfinal HttpKit 有封装http请求类。内含get、post请求。以及post 流的发送方式。另外提供流的获取方式。 Jfinal目前用于客户端android、ios提供接口服务器比较常见，下边博主来说一下如何发送请求、如何接收请求
下边我来先贴一下Jfinal HttpKit的封装类：
package com.jfinal.kit;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.security.KeyManagementException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Map;
import java.util.Map.Entry;
import javax.net.ssl.HostnameVerifier;
import javax.net.ssl.HttpsURLConnection;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSession;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManager;
import javax.net.ssl.X509TrustManager;
import javax.servlet.http.HttpServletRequest;
/**
* HttpKit
*/
public class HttpKit {
private HttpKit() {}
/**
* https 域名校验
*/
private static class TrustAnyHostnameVerifier implements HostnameVerifier {
public boolean verify(String hostname, SSLSession session) {
return true;
}
}
/**
* https 证书管理
*/
private static class TrustAnyTrustManager implements X509TrustManager {
public X509Certificate[] getAcceptedIssuers() {
return null;
}
public void checkClientTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
public void checkServerTrusted(X509Certificate[] chain, String authType) throws CertificateException {
}
}
private static final String GET = "GET";
private static final String POST = "POST";
private static String CHARSET = "UTF-8";
private static final SSLSocketFactory sslSocketFactory = initSSLSocketFactory();
private static final TrustAnyHostnameVerifier trustAnyHostnameVerifier = new HttpKit.TrustAnyHostnameVerifier();
private static SSLSocketFactory initSSLSocketFactory() {
try {
TrustManager[] tm = {new HttpKit.TrustAnyTrustManager() };
SSLContext sslContext = SSLContext.getInstance("TLS"); // ("TLS", "SunJSSE");
sslContext.init(null, tm, new java.security.SecureRandom());
return sslContext.getSocketFactory();
}
catch (Exception e) {
throw new RuntimeException(e);
}
}
public static void setCharSet(String charSet) {
if (StrKit.isBlank(charSet)) {
throw new IllegalArgumentException("charSet can not be blank.");
}
HttpKit.CHARSET = charSet;
}
private static HttpURLConnection getHttpConnection(String url, String method, Map<String, String> headers) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
URL _url = new URL(url);
HttpURLConnection conn = (HttpURLConnection)_url.openConnection();
if (conn instanceof HttpsURLConnection) {
((HttpsURLConnection)conn).setSSLSocketFactory(sslSocketFactory);
((HttpsURLConnection)conn).setHostnameVerifier(trustAnyHostnameVerifier);
}
conn.setRequestMethod(method);
conn.setDoOutput(true);
conn.setDoInput(true);
conn.setConnectTimeout(19000);
conn.setReadTimeout(19000);
conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
if (headers != null && !headers.isEmpty()) {
for (Entry<String, String> entry : headers.entrySet()) {
conn.setRequestProperty(entry.getKey(), entry.getValue());
}
}
return conn;
}
/**
* Send GET request
*/
public static String get(String url, Map<String, String> queryParas, Map<String, String> headers) {
HttpURLConnection conn = null;
try {
conn = getHttpConnection(buildUrlWithQueryString(url, queryParas), GET, headers);
conn.connect();
return readResponseString(conn);
}
catch (Exception e) {
throw new RuntimeException(e);
}
finally {
if (conn != null) {
conn.disconnect();
}
}
}
public static String get(String url, Map<String, String> queryParas) {
return get(url, queryParas, null);
}
public static String get(String url) {
return get(url, null, null);
}
/**
* Send POST request
*/
public static String post(String url, Map<String, String> queryParas, String data, Map<String, String> headers) {
HttpURLConnection conn = null;
try {
conn = getHttpConnection(buildUrlWithQueryString(url, queryParas), POST, headers);
conn.connect();
if (data != null) {
OutputStream out = conn.getOutputStream();
out.write(data.getBytes(CHARSET));
out.flush();
out.close();
}
return readResponseString(conn);
}
catch (Exception e) {
throw new RuntimeException(e);
}
finally {
if (conn != null) {
conn.disconnect();
}
}
}
public static String post(String url, Map<String, String> queryParas, String data) {
return post(url, queryParas, data, null);
}
public static String post(String url, String data, Map<String, String> headers) {
return post(url, null, data, headers);
}
public static String post(String url, String data) {
return post(url, null, data, null);
}
private static String readResponseString(HttpURLConnection conn) {
BufferedReader reader = null;
try {
StringBuilder ret;
reader = new BufferedReader(new InputStreamReader(conn.getInputStream(), CHARSET));
String line = reader.readLine();
if (line != null) {
ret = new StringBuilder();
ret.append(line);
} else {
return "";
}
while ((line = reader.readLine()) != null) {
ret.append('\n').append(line);
}
return ret.toString();
}
catch (Exception e) {
throw new RuntimeException(e);
}
finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
LogKit.error(e.getMessage(), e);
}
}
}
}
/**
* Build queryString of the url
*/
private static String buildUrlWithQueryString(String url, Map<String, String> queryParas) {
if (queryParas == null || queryParas.isEmpty()) {
return url;
}
StringBuilder sb = new StringBuilder(url);
boolean isFirst;
if (url.indexOf('?') == -1) {
isFirst = true;
sb.append('?');
}
else {
isFirst = false;
}
for (Entry<String, String> entry : queryParas.entrySet()) {
if (isFirst) {
isFirst = false;
} else {
sb.append('&');
}
String key = entry.getKey();
String value = entry.getValue();
if (StrKit.notBlank(value)) {
try {value = URLEncoder.encode(value, CHARSET);} catch (UnsupportedEncodingException e) {throw new RuntimeException(e);}
}
sb.append(key).append('=').append(value);
}
return sb.toString();
}
public static String readData(HttpServletRequest request) {
BufferedReader br = null;
try {
StringBuilder ret;
br = request.getReader();
String line = br.readLine();
if (line != null) {
ret = new StringBuilder();
ret.append(line);
} else {
return "";
}
while ((line = br.readLine()) != null) {
ret.append('\n').append(line);
}
return ret.toString();
} catch (IOException e) {
throw new RuntimeException(e);
}
finally {
if (br != null) {
try {br.close();} catch (IOException e) {LogKit.error(e.getMessage(), e);}
}
}
}
@Deprecated
public static String readIncommingRequestData(HttpServletRequest request) {
return readData(request);
}
}
从上边这个类我们可以看出HttpKit提供的方法有如下几种
看图中介绍，就可以得出，get方法涉及三种形式。满足多参数、多headers的请求方式
post方法也满足了多参数、多header的请求方式，另外还有个参数data，这个data就是以流的形式进行发送的。
打个比方来说：
如果你想向某个服务端发送超大json数据，这个json数据你放入queryParas中肯定是不行的。那么就需要以流的形式发送过去。
举例说明：
public static void main(String[] args) {
String url = "https://xxxx.com/upload";
Map<String, String> queryParas = new HashMap<String, String>();
queryParas.put("key", "123");
queryParas.put("version", "1.2.1");
String jsonData = "超大json数据";
String result = HttpKit.post(url, queryParas, jsonData);
System.out.println("请求结果："+result);
}
那么在服务端进行获取的时候就要用到上边的readData方法了。但是使用这个方法相信很多人遇到了麻烦，为什么获取不到呢？
其实获取body参数，需要在request.getParameter()方法之前调用（如果有需要取QueryString参数的话），因为一旦调用了getParameter()方法之后，再通过IO流的方式获取body参数就失效了
也就是说，我们必须先获取body流数据，然后再获取参数才可。
举例说明(按照以下顺序获取)：
String json = HttpKit.readData(getRequest());
String key = getPara("key");
String version = getPara("version");
好了，这个请求类可以拿出来做个封装，android端也是可以用的，都是java，出自一个地方。
7 +1
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原文地址: https://www.sunjs.com/article/detail/a98861b9c97e46808f50cc74cd3ee0a6.html
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