我要评论前言
okhttp 是一个由 square 开发的高效、现代的 http 客户端库，用于 android 和 java 应用程序。它支持 http/2 和 spdy 等现代网络协议，并提供了多种功能和优化，使其成为处理网络请求的流行选择。这次项目中我将会使用okhttp来发送网络请求
一、okhttp是什么？
okhttp 是一个由 square 开发的高效、现代的 http 客户端库，用于 android 和 java 应用程序。
二、使用步骤
1.okhttp请求代码
package com.easybbs.utils;
import com.easybbs.entity.enums.responsecodeenum;
import com.easybbs.exception.businessexception;
import okhttp3.*;
import org.slf4j.logger;
import org.slf4j.loggerfactory;
import javax.net.ssl.sslcontext;
import javax.net.ssl.sslsocketfactory;
import javax.net.ssl.trustmanager;
import javax.net.ssl.x509trustmanager;
import java.io.ioexception;
import java.net.connectexception;
import java.net.sockettimeoutexception;
import java.security.securerandom;
import java.security.cert.x509certificate;
import java.util.map;
import java.util.concurrent.timeunit;
public class okhttputils {
/**
* 请求超时时间5秒
*/
private static final int time_out_seconds = 5;
private static logger logger = loggerfactory.getlogger(okhttputils.class);
private static okhttpclient.builder getclientbuilder() {
okhttpclient.builder clientbuilder = new okhttpclient.builder().followredirects(false).addinterceptor(new redirectinterceptor()).retryonconnectionfailure(false);
clientbuilder.connecttimeout(time_out_seconds, timeunit.seconds).readtimeout(time_out_seconds, timeunit.seconds);
clientbuilder.sslsocketfactory(createsslsocketfactory()).hostnameverifier((hostname, session) -> true);
return clientbuilder;
}
private static request.builder getrequestbuilder(map<string, string> header) {
request.builder requestbuilder = new request.builder();
if (null != header) {
for (map.entry<string, string> map : header.entryset()) {
string key = map.getkey();
string value;
if (map.getvalue() == null) {
value = "";
} else {
value = map.getvalue();
}
requestbuilder.addheader(key, value);
}
}
return requestbuilder;
}
private static formbody.builder getbuilder(map<string, string> params) {
formbody.builder builder = new formbody.builder();
if (params == null) {
return builder;
}
for (map.entry<string, string> map : params.entryset()) {
string key = map.getkey();
string value;
if (map.getvalue() == null) {
value = "";
} else {
value = map.getvalue();
}
builder.add(key, value);
}
return builder;
}
public static string getrequest(string url) throws businessexception {
responsebody responsebody = null;
try {
okhttpclient.builder clientbuilder = getclientbuilder();
request.builder requestbuilder = getrequestbuilder(null);
okhttpclient client = clientbuilder.build();
request request = requestbuilder.url(url).build();
response response = client.newcall(request).execute();
responsebody = response.body();
return responsebody.string();
} catch (sockettimeoutexception | connectexception e) {
logger.error("okhttp post 请求超时,url:{}", url, e);
throw new businessexception(responsecodeenum.code_900);
} catch (exception e) {
logger.error("okhttp get 请求异常", e);
return null;
} finally {
if (responsebody != null) {
responsebody.close();
}
}
}
public static string postrequest(string url, map<string, string> header, map<string, string> params) throws businessexception {
responsebody responsebody = null;
try {
okhttpclient.builder clientbuilder = getclientbuilder();
request.builder requestbuilder = getrequestbuilder(header);
formbody.builder builder = getbuilder(params);
okhttpclient client = clientbuilder.build();
requestbody requestbody = builder.build();
request request = requestbuilder.url(url).post(requestbody).build();
response response = client.newcall(request).execute();
responsebody = response.body();
string responsestr = responsebody.string();
return responsestr;
} catch (sockettimeoutexception | connectexception e) {
logger.error("okhttp post 请求超时,url:{}", url, e);
throw new businessexception(responsecodeenum.code_900);
} catch (exception e) {
logger.error("okhttp post 请求异常,url:{}", url, e);
return null;
} finally {
if (responsebody != null) {
responsebody.close();
}
}
}
private static sslsocketfactory createsslsocketfactory() {
sslsocketfactory ssffactory = null;
try {
sslcontext sc = sslcontext.getinstance("tlsv1.2");
sc.init(null, new trustmanager[]{new trustallcerts()}, new securerandom());
ssffactory = sc.getsocketfactory();
} catch (exception e) {
e.printstacktrace();
}
return ssffactory;
}
}
class trustallcerts implements x509trustmanager {
@override
public void checkclienttrusted(x509certificate[] chain, string authtype) {
}
@override
public void checkservertrusted(x509certificate[] chain, string authtype) {
}
@override
public x509certificate[] getacceptedissuers() {
return new x509certificate[0];
}
}
class redirectinterceptor implements interceptor {
private static logger logger = loggerfactory.getlogger(redirectinterceptor.class);
@override
public response intercept(chain chain) throws ioexception {
request request = chain.request();
response response = chain.proceed(request);
int code = response.code();
if (code == 307 || code == 301 || code == 302) {
//获取重定向的地址
string location = response.headers().get("location");
logger.info("重定向地址,location:{}", location);
//重新构建请求
request newrequest = request.newbuilder().url(location).build();
response = chain.proceed(newrequest);
}
return response;
}
}2.获取ip地址
代码如下（示例）：这个代码只能获取到省份地址，具体信息请看下面的详细访问
public string getipaddress(string ip){
try {
string url = "http://whois.pconline.com.cn/ipjson.jsp?json=true&ip=" + ip;
string responsejson = okhttputils.getrequest(url);
if(null == responsejson){
return constants.no_address;
}
map<string,string> addressinfo = jsonutils.convertjson2obj(responsejson,map.class);
return addressinfo.get("pro");
}catch (exception e){
logger.error("获取ip地址失败",e);
}
return constants.no_address;
}3.controller层获取ip地址
@requestmapping("/login")
public string login(httpservletrequest request){
string ip = getipaddr(request)
return getipaddress(ip);
}
/**
* 获取客户端ip地址
* 由于客户端的ip地址可能通过多个代理层转发，因此需要检查多个http头字段以获取真实ip。
* 此方法首先检查“x-forwarded-for”头，这是最常用的代理头，然后尝试其他不那么常见的头字段。
* 如果所有尝试都失败，则回退到使用请求的远程地址。
*
* @param request httpservletrequest对象，用于获取客户端ip地址。
* @return 客户端的ip地址字符串。如果无法确定客户端ip，则返回请求的远程地址。
*/
protected string getipaddr(httpservletrequest request) {
// 尝试获取“x-forwarded-for”头，这是最常用的代理头字段。
string ip = request.getheader("x-forwarded-for");
// 检查“x-forwarded-for”头是否有效，并提取第一个ip地址。
if (ip != null && ip.length() != 0 && !"unknown".equalsignorecase(ip)) {
// 多次反向代理后会有多个ip值，第一个ip才是真实ip
if (ip.indexof(",") != -1) {
ip = ip.split(",")[0];
}
}
// 如果“x-forwarded-for”头无效，尝试其他不那么常见的代理头字段。
if (ip == null || ip.length() == 0 || "unknown".equalsignorecase(ip)) {
ip = request.getheader("proxy-client-ip");
}
if (ip == null || ip.length() == 0 || "unknown".equalsignorecase(ip)) {
ip = request.getheader("wl-proxy-client-ip");
}
if (ip == null || ip.length() == 0 || "unknown".equalsignorecase(ip)) {
ip = request.getheader("http_client_ip");
}
if (ip == null || ip.length() == 0 || "unknown".equalsignorecase(ip)) {
ip = request.getheader("http_x_forwarded_for");
}
if (ip == null || ip.length() == 0 || "unknown".equalsignorecase(ip)) {
ip = request.getheader("x-real-ip");
}
// 如果所有代理头字段都无效，回退到使用请求的远程地址作为客户端ip。
if (ip == null || ip.length() == 0 || "unknown".equalsignorecase(ip)) {
ip = request.getremoteaddr();
}
// 返回获取到的ip地址，无论它是通过代理头还是直接从请求中获取。
return ip;
}
获取信息如上，可以自行获取其他信息
总结
本次项目总结如何获取ip地址
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