Http学习之使用HttpURLConnection发送post和get请求（1）

最常用的Http请求无非是get和post，get请求可以获取静态页面，也可以把参数放在URL字串后面，传递给servlet，post与get的不同之处在于post的参数不是放在URL字串里面，而是放在http请求的正文内。
在Java中可以使用HttpURLConnection发起这两种请求，了解此类，对于了解soap，和编写servlet的自动测试代码都有很大的帮助。

项目结构

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" alt="" />

其中jsp1.jsp的代码

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
  <head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
    <meta http-equiv="pragma" content="no-cache">
    <meta http-equiv="cache-control" content="no-cache">
    <meta http-equiv="expires" content="0">
    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
    <meta http-equiv="description" content="This is my page">
    <!--
    <link rel="stylesheet" type="text/css" href="styles.css">
    -->
  </head>

  <body>
    jsp1<br>
  </body>
</html>

下面的代码简单描述了如何使用HttpURLConnection发起这两种请求，以及传递参数的方法：

import java.io.*;
import java.net.*;

public class HttpInvoker {

    public static final String GET_URL = "http://localhost:8080/servlet1/jsp1.jsp";

    public static final String POST_URL = "http://localhost:8080/servlet1/jsp1.jsp";

    public static void readContentFromGet() throws IOException {
        // 拼凑get请求的URL字串，使用URLEncoder.encode对特殊和不可见字符进行编码
        String getURL = GET_URL + "?username="
                + URLEncoder.encode("fat man", "utf-8");
        URL getUrl = new URL(getURL);
        // 根据拼凑的URL，打开连接，URL.openConnection函数会根据URL的类型，
        // 返回不同的URLConnection子类的对象，这里URL是一个http，因此实际返回的是HttpURLConnection
        HttpURLConnection connection = (HttpURLConnection) getUrl
                .openConnection();
        // 进行连接，但是实际上get request要在下一句的connection.getInputStream()函数中才会真正发到
        // 服务器
        connection.connect();
        // 取得输入流，并使用Reader读取
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                connection.getInputStream()));
        System.out.println("=============================");
        System.out.println("Contents of get request");
        System.out.println("=============================");
        String lines;
        while ((lines = reader.readLine()) != null) {
            System.out.println(lines);
        }
        reader.close();
        // 断开连接
        connection.disconnect();
        System.out.println("=============================");
        System.out.println("Contents of get request ends");
        System.out.println("=============================");
    }

    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(POST_URL);
        // 打开连接
        HttpURLConnection connection = (HttpURLConnection) postUrl
                .openConnection();
        // Output to the connection. Default is
        // false, set to true because post
        // method must write something to the
        // connection
        // 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);
        // Set the post method. Default is GET
        connection.setRequestMethod("POST");
        // Post cannot use caches
        // Post 请求不能使用缓存
        connection.setUseCaches(false);
        // This method takes effects to
        // every instances of this class.
        // URLConnection.setFollowRedirects是static函数，作用于所有的URLConnection对象。
        // connection.setFollowRedirects(true);

        // This methods only
        // takes effacts to this
        // instance.
        // URLConnection.setInstanceFollowRedirects是成员函数，仅作用于当前函数
        connection.setInstanceFollowRedirects(true);
        // Set the content type to urlencoded,
        // because we will write
        // some URL-encoded content to the
        // connection. Settings above must be set before connect!
        // 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，下面我们可以看到我们对正文内容使用URLEncoder.encode
        // 进行编码
        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());
        // The URL-encoded contend
        // 正文，正文内容其实跟get的URL中'?'后的参数字符串一致
        String content = "firstname=" + URLEncoder.encode("一个大肥人", "utf-8");
        // DataOutputStream.writeBytes将字符串中的16位的unicode字符以8位的字符形式写道流里面
        out.writeBytes(content); 

        out.flush();
        out.close(); // flush and close
        BufferedReader reader = new BufferedReader(new InputStreamReader(
                connection.getInputStream()));
        String line;
        System.out.println("=============================");
        System.out.println("Contents of post request");
        System.out.println("=============================");
        while ((line = reader.readLine()) != null) {
            System.out.println(line);
        }
        System.out.println("=============================");
        System.out.println("Contents of post request ends");
        System.out.println("=============================");
        reader.close();
        connection.disconnect();
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        try {
            readContentFromGet();
            readContentFromPost();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

输出

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" alt="" />

把jsp1.jsp的源代码都读出来了

假如我们在servlet中

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class test1 extends HttpServlet {

    public test1() {
        super();
    }

    public static final String GET_URL = "http://localhost:8080/servlet1/jsp1.jsp";

    public static final String POST_URL = "http://localhost:8080/servlet1/jsp1.jsp";

    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        String getURL = GET_URL + "?username="+ URLEncoder.encode("fat man", "utf-8");
        URL getUrl = new URL(getURL);
        HttpURLConnection connection = (HttpURLConnection) getUrl.openConnection();
        connection.connect();
        BufferedReader reader = new BufferedReader(new InputStreamReader(connection.getInputStream()));
        String lines;
        StringBuffer sb=new StringBuffer();
        while ((lines = reader.readLine()) != null) {
            sb.append(lines);
        }
        reader.close();
        // 断开连接
        connection.disconnect();
        //System.out.println(sb);

        response.setContentType("text/html");
        PrintWriter out = response.getWriter();
        out.print(sb);
        out.flush();
        out.close();

    }

    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

    }

}

访问test1的servlet，它把jsp的资源给获取，然后response出去

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAU8AAABuCAIAAAAoKAaCAAAPfUlEQVR4nO2c+1cb14HH57/w/+DTbs5Zst3tpmm72+3jtEm2aePmpAlZl8RO6iS2MYbYsh1I/QDRVMaJycGAwgoBBtkUIQGGsEHGNtgYjBBIYJ6yeemBJPR+zIzC/iAkzUtCBhdw5vs53x/Q1Z07d2b0uffOICDOVWnOVbaeq1KfrWj5tOLvRV9eL7qs+uSLpjOfXz1dVi+RKSUXladkdRJZreRinUSmlMhqT/6t9qSs9qRMeVJWK5HVSS7WnSqrk5TVnSqrP11Wf/pSw6myhtNlDWcuXT19qeFMWf3psnrJxbpTZUpJmVIiU578m+LEZzUn/lpTUCovkMoLSuUfl8oLpNUFpdUfS+X50uoCaXV+LCWV+SWVx0uu5JdU5hdfOV5SdbykMr+kMr+kqkBaVSCtLpBWF0jlrPz1q4JSeSz5sUirj0urj5dUHS+pyiupzCupzCvmpCrxwzHhVHKSG8uFtCmuyi2uOlZcfawkETk71ceKq3OLq2L1j56/cvT8lSPnKlg5X3H0fEXsraPnrxw5X8GtEK92JF7niXOhkpncC5W5F6pinc8trmb0n93zeOcLL371/R+/8olMLty981vrW9rEG0+xl+RVqM4VPorEJVi/CkfjV2HzYZ9MXoevJPu5frbj51mwb8lPSBWztfXzLHTIqXYdC+EN0QiCiCGE3UchCCKGEDYvhSCIGELYvCSCIGIIYfWQGWZ5NTI577g7Otcz+LCzb1R7c1h7c/jGHUPP4MO7o3MTj1eWVyOZt4YgyDYno5X8kjM0YHrc1qsfmZy3OLy+IBkmaZL+lqS/DZO0L0hanb6Ryfm2Xv2A8dGSM7TjKxYEQfghrB4qTSxucujhYlf/2GPrapiKkvS3YSoaikQD8QQj0RAZjb0VoaKLdndn3+jQw0WLm0zfMoIg2xzC4iFTZdri7tVPm+YsQZIOU9FghA6kTTBCh6lomKRNc5Ze/fS0xb20Gk7TPoIg2xnC4iYFM2f1dvWNLdrc4Ug0GI4GMk4wHA2T0SW7p3tg/NrXA5qbw9pePYIgOx7C4qH4mbZ4vrn/0OYKhKlokLFuzzDBSDRMRR2e0JBhwuX20ACAXYCA7fMrwV79zKLdHaae2HNmwlTUteozTs1FIuQaAGCnIZbdJCf3xxeMc5YQFfWHad8W4g/TFB19vGR9tGDZ6cMEAKwRS26SmSmL57ZhxuUN+cK0d6PUNv294bomTQV/mPYFw+PTj3yB4E4fKQBih1h2U8zcHXs8t+wMRKIbqn62tOy5f/3pP/3gp19W16apFopEbQ7nzKPFVD0IBoMmk6mnp0er1Wq12p6eHpPJFAxidADgKUMsualEHq+EOvqM/hDtC0W9aXNOWvZv//Gbl/7wp1+/9vbzP/q5J0inqukLRUMR+v7IBElS/N0vLi62tbX19/cPDw+Pj48PDw/Pzs62trZqtdqFhYXtPx0AfIchFlfJRAyzKyNTS/5I1BNKl7OlZT/8z5defevgGweOvvzGO//b0Jy+foCMmhctdscqZ98LCws3btyw2+0+n0+v12u1Wo1G09fX19LSotVq1Wp1CuFNqqJynX0bTk4MY+FeYp9qy82o9hF7C41Pr71nlG2+eIAJy/bbhrmZJac3FHUHU+Zs6aV//9nLr2a//8eDx1596z1FY4snbX13MOoNRZdsrikzS91AINDa2up0OmmapijK6/Xevn27Oc6NGzcMBoNarQ4EArw+/8M+MHZdeZHKxN3Rs2G7XVdetA7jEJKljEKTKl6TcRoFaybf4hVulie9eCaVUJeebq/suvIiUYxBxOIqlUj3/SmL0+cJ0e6gcM6Wfv7Cf73y+7cPvX2o4I8Hchua29JUTsQToh0ev2Fihrljg8Gg0+lIkiRJ0ul0Njc3X2MzOjra3NxsMBh4fU7xgWEVb+azwGk33sQusz3RDhOTKqGEXVceP4xkabKQ8TbjfaGajLafogkbtMZ8OyahSiV4JeMVN3GhWV2IjSYqcaw4WHP7jX7jijfoSa36j37x3/v2f7D/wxM5hyVvvZf3q99n/+Anv/r+v/z4e8+/+L3nX9z7zy/87o39ArYHaZcvNDg6wdxxR0fHgwcPFhYWDAZDa2trE4+uri6z2dzR0cHr8z/I9hSyPyu2J/qe+Jn7qebZkfhZsKbwy63yBLZzOilcb+sXOoNefVcgFlbJRFp7RzxBajUgkCpF0ws/f+X1dw7nHDn1bu6Zd3PP5ByWvPl+3r4/ffja/xyK5dXs93/4s5cEN/cFqb4HY8wdNzY2tre3q9Xqq0JoNJrZ2VmHw9HY2Mjrs0lVVK4zxVeeic9wcnmqSyxVYzMWewOBSXC9Veanxq4rX3+TZadqHxGH6VyyeL3UWLiXU41je2KLpPjJbRilrIaYNfYWGgWmZLuunFHEWamz53GTqihpjGBNzmlJ3gHwSxjLhfXzX65SlXOG33KdnTsuMTdnX8S04/Z6r0ycCy14Q5MsKtfZhfchGtvnXWQi6psj7gDp8lP8fFGpeOn1nHeOnD6YV5Qq7+Z+8ovfvim4uTtA8m2vZ9DU1FRfX69Wq1tbW+vr641Go9/vt1gsV69e5fXZpEpeKsYSNvXcztwgKTnLduFb9rW1Nabtqn0E2/tkMXu6NRbuW3/N2jhpe3xTY+FeRmmikcQLgXUAc25nHH3yQ81QMYXDcUlYigrWZPzME4I5RjBXCYI94C8jBDfPbG5P0UP2iL3eksDmYp7bXWQiHX1Gq8u/GqBdvDj95NnPyt8+VPD+8U//XHD2zwVnD+YV7f/w5JsH8944kBvLH3I+Onj4BH/b1SBtdfk5K3mNRqNUKpVK5Z07d8bGxsxmc2dn5717965fv65UKicmJhYXF/V6vUaj4fU5xbozre2ctSl3skgje9I4zho6Xi64tOZP98Ir+fgLrtbx2rGhgbOMSLuSZ45mAg5zrV8vE7adP2YmXzJnyeTYwT7VidGIf5WEN8/IdlaJ0CjGmu9jO9rg3kQstjPn9q6Bh2ar2xWknQGh+MkLZRX7Pzpx6ONzH5y88E7uJ+09fZxb9FWhbVeD9LzNPTI+zdzx0NCQQqHo7u52uVxut9vtdi8vL3d1dSkUCoVCoVQqYz8PDg7y+rxF2zce7dk1ntx21b7kWjzx7uZsZzTIXSOk7L/grCZYuP5KsCb/tMS3KEo1aaY8k+zbgXRP1zKwPe2aJZWzzKEKtrvIeRd5a2ROP7ngDtJOPyUcX6S47ErOkVMfSooP5BW+/HpOk7ozZeV43EF6dGphcm6euWO/369UKmtqakZHR11x9Hp9U1NTTU1NXV2dSqVSKpV+v5/X583YXsSb0Bgr+bSyZ7aSjxerCmN318zb90xsT7mSL1Qldsdph3EsrJsS1pP29VL+XXu8lHsGUq7dTTrOopyzU2GT7LryovJyoZFXcPMMbE93sdgHp4qNKjruWCBi2x87yUSGp+2dfWPuEO3wUynji5Rcqnw398wHkgvZh/J/8uvXrrZ0pKvvp9whWjdgtK24OPuenZ2Vy+WNjY0Oh8PpdDqdTrvdXl9f39HR0dnZqVAoZmdnhfqc6gny+kIu+WFiPaVLPLrjLXnTy86yU/BBGrM46f/6Ir4ws7mdtRVz6c5oysgq4T+lE376lLqMuS4XqCkkLmcrwed2HG2SDwN5Ffibsy4id7HP//UBs1vc88DfC7ckfvH59xPfVVi2z1gCCs0dhyfi8FEr3tTxREo+r37veNHhM9K3DhW8+Mvfpqns8FEOT0TdfVfw715nZmZqampaWlru3bvX19fX3Nzc0tKiVqtrampmZmb49TdH2pF7g7lDrDzVr9Q8NXZnr54ZiEdOkpneEXPv8KTTT2/wH+08EekX1QeOFe7/SHKpUpmmptNP3xqenDan/NK7z+cbGBi4du2aXC6Xy+XXrl0bGBjw+XxP8SDTCQzZBdmdWu3OXj07cG03Lbibvh6YW3av+Gm7L228ZE2jRqFqc6SuueKn55bd7TcHvX7+F2C3DxgMwBrf9kdO8psHs+qeIVeQtvspmy9dVvxUmjp2P+UK0m23HkzMPNrpwwQArBFmJ8nJlCXQ1D2oG5x0Bmirl9p0nAH69shU150H+E9VAOwGCLOD5Mc476683qOfXHT4aJuHsrqfLDYP5fDRo9PLDVqdx8f/FRoAYAcg5hykYEyL3ssNnT33H9o8EauH4vyLmzSxeiibh7w5NHW58evK6zcV2v7atrsIgux4Uto+5yBHzE65ureho3/BEbD76GUPxfxHN/wseyi7j15yBurb+6tbevWzjkdO8rGLQhBkN4SYc0TSZHYlrO41/OVLVdvtkWVX0OGnbF7K4iGXPeRS7H/UekiLh7R5KYefWl4NdfWPfVquUvcaZlfC6VtGEGSbQ8yuRDbM+JKvvuPeqYt1Farub+4/HJ93mG1euydi90TMNu/4vKNnaKpC1S2R1dW29Y8v+TJpE0GQbU5GtscybQvf1Ju/ar1VWqMputx04jPFic8URZcbS2s08tZbPcPmaVt4x48HQZBUIWZWIgiCiCGwHUHEEmLGHkEQRAwhpu0RBEHEEEL1f3oEQcQQYqe/zAcA2CZgOwBiAbYDIBZgOwBiAbYDIBZgOwBiAbYDIBZgOwBiAbYDIBZgOwBiAbYDIBZgOwBiIUPbJ7MIQqae3Nq+JqXS9q21AADYPNthu9XYvocgCILIge0A7Bzbt5Jvl+bAdgB2ENgOgFjY2HZZdhZBEASxp91o5RUm1+ft0hyCIGRqdfwNVv012A7ATpPh3G7Nee65hL2TalniHt5qbM+POyzLziKIrMl4nT3P5TB1h+0A7CybtD0rW8avJMvOYjzJY22yBtsB2Gk2Y/va2tqkWkbwHrPDdgB2M5u0PUG7NCcxz8N2AHYzm7Fdlp3N+M375C/j9+ey7KzEvXq7NId/3y64/gcAbA+bsT32+J3gPXuXZWflS6V71suzkrN8/Ns1Mbb8nTwAwGZIZ7ssOyu29rYa2/cw7E1THyYDsGtJZ3viURyRgeqJCR835wDsTvA3cACIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIBdgOgFiA7QCIhf8Hqyq+rxJ0efQAAAAASUVORK5CYII=" alt="" />

效果等同于直接访问jsp

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" 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上面的readContentFromGet()函数产生了一个get请求，传给servlet一个username参数，值为"fat man"。
readContentFromPost()函数产生了一个post请求，传给servlet一个firstname参数，值为"一个大肥人"。
HttpURLConnection.connect函数，实际上只是建立了一个与服务器的tcp连接，并没有实际发送http请求。无论是post还是get，http请求实际上直到HttpURLConnection.getInputStream()这个函数里面才正式发送出去。

在readContentFromPost()
中，顺序是重中之重，对connection对象的一切配置（那一堆set函数）都必须要在connect()函数执行之前完成。而对
outputStream的写操作，又必须要在inputStream的读操作之前。这些顺序实际上是由http请求的格式决定的。

http
请求实际上由两部分组成，一个是http头，所有关于此次http请求的配置都在http头里面定义，一个是正文content，在connect()函
数里面，会根据HttpURLConnection对象的配置值生成http头，因此在调用connect函数之前，就必须把所有的配置准备好。

紧接着http头的是http请求的正文，正文的内容通过outputStream写入，实际上outputStream不是一个网络流，充其量是个字符串流，往里面写入的东西不会立即发送到网络，而是在流关闭后，根据输入的内容生成http正文。

至
此，http请求的东西已经准备就绪。在getInputStream()函数调用的时候，就会把准备好的http请求正式发送到服务器了，然后返回一个
输入流，用于读取服务器对于此次http请求的返回信息。由于http请求在getInputStream的时候已经发送出去了（包括http头和正
文），因此在getInputStream()函数之后对connection对象进行设置（对http头的信息进行修改）或者写入
outputStream（对正文进行修改）都是没有意义的了，执行这些操作会导致异常的发生。