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Java模擬Http Get和Post 提交

java HTML我幫您 1年前  0次瀏覽
本帖最后由 html580 于 2014-5-15 10:06 編輯 在工具中有時我們要進行模態表單提交數據,現在給大家一個通過通過HttpURLConnection模擬Http Get和Post表單提交。
相關文章: Java 使用HttpClient模擬 Http Get和Post 提交
package com.html580.connection;

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.URLConnection;
import java.util.List;
import java.util.Map;

import org.junit.Test;

public class URLConnectionHelper {
/**
* 向指定URL發送GET方法的請求
*
* @param url
* 發送請求的URL
* @param params
* 請求參數,請求參數應該是name1=value1&name2=value2的形式。
* @return URL所代表遠程資源的響應
*/
public static String sendGet(String url, String params) {
String result = "";
BufferedReader in = null;
try {
String urlName = url + "?" + params;
URL realUrl = new URL(urlName);
// 打開和URL之間的連接
URLConnection conn = realUrl.openConnection();
// 設置通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

// 建立實際的連接
conn.connect();
// 獲取所有響應頭字段

Map> map = conn.getHeaderFields();
// 遍歷所有的響應頭字段
for (String key : map.keySet()) {
System.out.println(key + "-" + map.get(key));
}

// 定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += "\n" + line;
}
} catch (Exception e) {
System.out.println("發送GET請求出現異常!" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸入流
finally {
try {
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}

/**
* 向指定URL發送POST方法的請求
*
* @param url
* 發送請求的URL
* @param params
* 請求參數,請求參數應該是name1=value1&name2=value2的形式。
* @return URL所代表遠程資源的響應
*/
public static String sendPost(String url, String params) {
PrintWriter out = null;
BufferedReader in = null;
String result = "";
try {
URL realUrl = new URL(url);
// 打開和URL之間的連接
HttpURLConnection conn = (HttpURLConnection)realUrl.openConnection();

conn.setRequestMethod("POST");
// 設置通用的請求屬性
conn.setRequestProperty("accept", "*/*");
conn.setRequestProperty("connection", "Keep-Alive");
conn.setRequestProperty("user-agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)");

// 發送POST請求必須設置如下兩行
conn.setDoOutput(true);
conn.setDoInput(true);
conn.connect();
// 獲取URLConnection對象對應的輸出流
out = new PrintWriter(conn.getOutputStream());
// 發送請求參數
out.print(params);
// flush輸出流的緩沖
out.flush();

// 定義BufferedReader輸入流來讀取URL的響應
in = new BufferedReader(new InputStreamReader(conn.getInputStream()));
String line;
while ((line = in.readLine()) != null) {
result += "\n" + line;
}
} catch (Exception e) {
System.out.println("發送POST請求出現異常!" + e);
e.printStackTrace();
}
// 使用finally塊來關閉輸出流、輸入流
finally {
try {
if (out != null) {
out.close();
}
if (in != null) {
in.close();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
return result;
}



public void testSendGet() {
String url = "http://localhost:8080/jeeweb/testServlet";
String params = "username=admin&password=123456";
String str = URLConnectionHelper.sendGet(url, params);
System.out.println(str);
}

@Test
public void testSendPost() {
String url = "http://localhost:8080/jeeweb/testServlet";
String params = "username=admin&password=123456";
String str = URLConnectionHelper.sendPost(url, params);
System.out.println(str);
}
}
測試Servlet
package com.html580.servlet;

import java.io.IOException;

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

/**
* @author html580.com
* 測試模擬表單提交Servlet
*/
public class TestServlet extends HttpServlet {

/**
* Destruction of the servlet.

*/
public void destroy() {
super.destroy();
}

/**
* The doGet method of the servlet.

*/
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String userid;
String passwd;
userid = request.getParameter("username");
passwd = request.getParameter("password");
System.out.println(userid);
System.out.println(passwd);
System.err.println("get");
}

/**
* The doPost method of the servlet.

*/
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
String userid;
String passwd;
userid = request.getParameter("username");
passwd = request.getParameter("password");
System.out.println(userid);
System.out.println(passwd);
System.err.println("Post");
}

/**
* Initialization of the servlet.

*/
public void init() throws ServletException {
// Put your code here
}
}




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