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整理一下用java模拟http请求的方法，如果有不正确的地方希望大家指正，如果大家有什么更好的方法欢迎提出
1、URLConnection可以向URL地址发送请求，读取URL的资源。建立和URL的连接通常需要一下几步：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.URL;
import java.net.URLConnection;
import java.util.List;
import java.util.Map;
public class HttpRequest {
/**
* 向指定URL发送GET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 URL 所代表远程资源的响应结果
*/
public static String sendGet(String url, String param) {
String result = "";
BufferedReader in = null;
try {
String urlNameString = url + "?" + param;
URL realUrl = new URL(urlNameString);
// 打开和URL之间的连接
URLConnection connection = realUrl.openConnection();
// 设置通用的请求属性
connection.setRequestProperty("accept", "*/*");
connection.setRequestProperty("connection", "Keep-Alive");
connection.setRequestProperty("user-agent",
"Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1;SV1)");
// 建立实际的连接
connection.connect();
// 获取所有响应头字段
Map<String, List<String>> map = connection.getHeaderFields();
// 遍历所有的响应头字段
for (String key : map.keySet()) {
System.out.println(key + "--->" + map.get(key));
}
// 定义 BufferedReader输入流来读取URL的响应
in = new BufferedReader(new InputStreamReader(
connection.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += line;
}
} catch (Exception e) {
System.out.println("发送GET请求出现异常！" + e);
e.printStackTrace();
}
// 使用finally块来关闭输入流
finally {
try {
if (in != null) {
in.close();
}
} catch (Exception e2) {
e2.printStackTrace();
}
}
return result;
}
/**
* 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;
}
}
测试方法
public static void main(String[] args) {
//发送 GET 请求
String s=HttpRequest.sendGet("http://localhost:6144/Home/RequestString", "key=123&v=456");
System.out.println(s);
//发送 POST 请求
String sr=HttpRequest.sendPost("http://localhost:6144/Home/RequestPostString", "key=123&v=456");
System.out.println(sr);
}
参考文章 1、http://www.cnblogs.com/zhuawang/archive/2012/12/08/2809380.html
2、http://www.cnblogs.com/ribavnu/archive/2013/05/17/3084060.html
2、HttpClient
import java.io.IOException;
import java.util.Map;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.HttpException;
import org.apache.commons.httpclient.HttpMethod;
import org.apache.commons.httpclient.NameValuePair;
import org.apache.commons.httpclient.methods.GetMethod;
import org.apache.commons.httpclient.methods.PostMethod;
import org.apache.commons.httpclient.params.HttpMethodParams;
public class HttpClientTest {
/**
* @param url 发送请求的地址
* @param params 请求参数（name=username&password=password）
* @throws Exception
*/
public void getMethod(String url,String params) throws Exception{
HttpClient client = new HttpClient();
//设置编码的问题
client.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");
HttpMethod method = new GetMethod(url+"?"+params);
//添加get请求发送的参数，如cookie等
method.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0");
//执行get的请求
client.executeMethod(method);
//直接得到求情返回的结果
String result = method.getResponseBodyAsString();
System.out.println(result);
}
/**
* @param url 发送请求的地址
* @param params 请求的参数 map
* @throws HttpException
* @throws IOException
*/
public void postMethod(String url,Map<String,String> params) throws HttpException, IOException{
HttpClient client = new HttpClient();
//设置编码的问题
client.getParams().setParameter(HttpMethodParams.HTTP_CONTENT_CHARSET, "utf-8");
PostMethod method = new PostMethod(url);
NameValuePair[] names = new NameValuePair[params!=null? params.size():0];
int i = 0;
if(params!=null){
for (String key : params.keySet()) {
names[i] = new NameValuePair(key, params.get(key));
i++;
}
}
//设置method的各种参数
method.addRequestHeader("User-Agent", "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:39.0) Gecko/20100101 Firefox/39.0");
method.addParameters(names);
client.executeMethod(method);
String result = method.getResponseBodyAsString();
System.out.println(result);
}
//测试方法
public static void main(String[] args) throws Exception {
HttpClientTest test = new HttpClientTest();
test.getMethod("https://www.baidu.com/", "");
}
}
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原文地址：http://www.cnblogs.com/hyzxx/p/4739924.html
